PREPARATORY SURVEY REPORT ON

THE PROJECT

FOR EMERGENCY REHABILITATION

OF

TRANSMISSION NETWORK

JUNE 2017

JAPAN INTERNATIONAL COOPERATION AGENCY (JICA)

GLOBAL HUMAN DEVELOPMENT JAPAN

YACHIYO ENGINEERING CO., LTD.

Ministerio dos Recursos Minerais e Energia (MIREME) Electricidade de Mozambique (EDM) The Republic of Mozambique

IL

CR(1)

17-037

PREFACE

Japan International Cooperation Agency (JICA) decided to conduct the preparatory survey and

entrust the survey to the Consortium consisting of Global Human Development Japan and

Yachiyo Engineering Co., Ltd.

The survey team held a series of discussions with the officials concerned of the Government of

Mozambique, and conducted field investigations. As a result of further studies in Japan, the

present report was finalized.

I hope that this report will contribute to the promotion of the project and to the enhancement of

friendly relations between our two countries.

Finally, I wish to express my sincere appreciation to the officials concerned of the Government

of Mozambique for their close cooperation extended to the survey team.

June, 2017

Toshiyuki NAKAMURA

Director General,

Industrial Development and Public Policy Department

Japan International Cooperation Agency

SUMMARY

i

SUMMARY

① Overview of the Country

Mozambique is a country of Southern Africa, on the shore of Indian Ocean, with a population of

twenty seven million, and it occupies a land area of about two times larger than that of Japan. In the

15th century, Portuguese reached the land for the first time as westerners, and colonized the land in

17th century. In 20th century, anti-colonialism became active and popular, and in 1975 Mozambique

attained its independence. However, civil war started after the independence and lasted until 1992.

After a peace process which continued for two years, a general election under the multi-party system

was held for the first time in October 1994, and the multi-party political system has continued since

then.

With peace settled down and abundant natural resources such as natural gas and coal, Mozambican

economy started to grow during the second half of 1990s recording annual growth rate of 6%. After

recovering from huge flooding in 2000 and 2001, industrial development started in 2005. The

development of industrial areas in Matola and Tete where coal is produced, the new mine development

in Mona, Nampla, the extraction of natural gas and the activation of economic activities by discovery

of new natural gas resources on the coast of Cabo Delgado in Inhanbane and the further development

of industrial area in Nacala, Beira and Matola and others have continued, and contributed to the annual

economic growth rate of 7% to 8% in recent years. Because of this rapid economic growth,

Mozambique is expected to be one of the countries in the world that will attain the highest economic

growth during the coming ten years.

② Background of the Project

In Mozambique, the power sector is supervised by the Ministerio dos Recursos Minerais e Energia

(MIREME) and it is operated by Electricidade de Mozambique (EDM). With the high economic

growth rate, electric power demand is also increasing rapidly with an annual rate of about 10%.

However, dilapidated transmission lines and equipment of the existing transmission, substation and

distribution system, are still found; therefore, reinforcement of the system to meet increasing power

demand is urgently necessary. The suppressed demand in Maputo and surrounding areas cannot be

overlooked.

Infulene Substation, the target site of this Grand Aid scheme, is the central substation that supplies

electricity to Maputo metropolitan and its surrounding areas in the southern power system. However,

the existing T2 transformer installed in 1971 is dilapidated, and it has reduced its supply reliability

considerably. In fact, its load is limited to approximately 50% of its rated capacity due to decline of

electric supply reliability. Under these circumstances of Infulene Substation, the Government of

Mozambique made the request of this project to the Government of Japan in order to improve the

quality of electricity supply in Maputo metropolitan area and make it stable. This project will replace

the existing T2 transformer with a new transformer of larger capacity as urgent rehabilitation , and the

switchgears of T2 transformer bay of primary and secondary sides will be investigated for necessary

renovation and reinforcement. Further, the procurement of mobile substation will be investigated so

ii

that the mobile substation can be used at distribution substations in Maputo surrounding areas.

③ Outline of the study findings and Project contents

In response to the request, JICA dispatched the Survey Team to Mozambique from November 20 to

December 24, 2016 (first field survey) in order to reconfirm the contents of the request and discuss the

contents for implementation with related agencies on the Mozambican side (EDM), and survey the

Project site and gather related materials and data.

On returning to Japan, the Survey Team examined the necessity, social and economic impacts and

validity of the Project based on the field survey materials and compiled the findings into the draft

preparatory survey report. JICA dispatched the Survey Team to Mozambique for the second field

survey (outline explanations) from April 23 to April 30, 2017 in order to explain and discuss the draft

preparatory survey report and reach a basic agreement with the Mozambican counterparts.

This project aims to achieve a stable power supply to Maputo metropolitan area through the

procurement of new 250 MVA transformer and relevant switchgears to replace the aging T2

transformer (66 MVA) and its relevant switchgears at Infulene Substation, which will lead to the

improvement of people’s lives in this area and the promotion of socioeconomic activities. In addition,

at present situation, 66/33 kV distribution substations located in Maputo surrounding area are

forecasted to be overloaded because of the shortage of capacity with the consideration of the growth of

power demand. To address this situation, a mobile substation will be procured for the stable power

supply in this area. The Outline of the Basic Plan is as follows:

Outline of the Basic Plan No. Equipment name Unit Quantity

(1) Rehabilitation of Infulene Substation 1-1 275kV Circuit Breaker (Porcelain clad type) Unit 1 1-2 275kV and 11kV Overhead Line and Terminals Lot 1 1-3 275/66/11kV Three-phase Autotransformer (250MVA) Unit 1

1-4 Station Transformer for T2 Transformer（250kVA） Unit 1 1-5 11kV Voltage Transformer and Through Type Current Transformer

for T2 Transformer Tertiary Side Lot 1

1-6 66kV Lightning Arrestor Unit 3 1-7 66kV Voltage Transformer Unit 3 1-8 66kVCurrent Transformer Unit 3 1-9 66kV Circuit Breaker Unit 2

1-10 66kV Disconnecting Switch Unit 4 1-11 Overhead Line and Terminals for T2 Transformer Secondary Side

and Bus Coupler Lot 1

1-12 Copper Pipe Lot 1 1-13 Equipment Pedestral Lot 1 1-14 Earthing System for T2 Transformer Secondary Side Lot 1 1-15 Control and Protection Panels for T2 Transformer Lot 1

(2) Procurement of Mobile Substation 2-1 66/33kV Mobile Substation (20 MVA) Lot 1

(3) Procurement of maintenance tools 3-1 Maintenance Tools Lot 1 3-2 Insulating Oil Analysis Equipment (moisture, gas, etc.) Lot 1 3-3 Insulation Oil Purifier Unit 1 3-4 Withstand Voltage Tester Lot 1 3-5 Protection Relay Tester Lot 1

iii

④ Project implementation schedule and cost estimation

In the case where the Project is implemented under the Government of Japan’s Grant Aid scheme,

Japan’s burden: approximately (confidential) yen, Mozambique’s burden: approx. 54 thousand USD.

The main items to be handled by the Mozambican side will be VAT refund (approximately 40 thousand

USD) and bank commission charge (approximately 14 thousand USD). The Project implementation

period including the detailed design and the tendering periods will be approximately 30.0 months.

⑤ Project Evaluation

(1) Relevance

The relevance for this Project is considered to be high as it helps to achieve Mozambican

socioeconomic development policy as well as Japan’s official development assistance (ODA) policy.

(2) Efficiency

The impacts expected from the implementation of the Project are as follows:

1） Quantitative impacts

Outcome indicator Actual value

in 2015 (Base value)

Target value in 2020

(Completion year)

Target value in 2023

(Three years after the completion)

Total capacity of T1 transformer to T3 transformer (275/66 kV)

436 MVA 620 MVA 620 MVA

Aggregate capacity utilization rate of T1 transformer to T3 transformer (Power flow when the system peak took place)

68.8%

(296 MVA)

52.2%

(324 MVA)

75.1%

(466 MVA)

The aggregate capacity utilization rate of T1 transformer to T3 transformer shown above was

calculated using the power flow data during the system peak period1. The actual capacity utilization

rate in 2015, 68.8%, reduces to 52.2% in 2020, which is caused by the increased transformer capacity

of T2 from 66 MVA to 250 MVA by this project. The target value in 2023 is 75.1%; however, the value

is the anticipated value when power demand increases as was forecasted, and maintenance of the

substation is conducted appropriately. The actual capacity utilization rate in 2023 will be calculated

based on the actual power flow data that will be recorded during the system peak period in 2023. So

this value in 2023 will be more or less than 75.1%, depending on the actual power flow data. This

means that the target value that will actually be attained in 2023 should not be necessarily more than

75.1%. So the target value of 75.1% in 2023 has to be treated with the caveat that this value has been

estimated according to the assumptions made during the present investigation.

1 The actual capacity utilization rate in 2015 was calculated using the power flow data shown in Figure 2-2-2-1.3, the target

capacity utilization rate in 2020 using the power flow data in Figure 2-2-2-2.2, and the target capacity utilization rate in 2023 using the power flow data in 2023 that was estimated by increasing the power flow in 2020 by the annual increase rate of 12.9% used for the demand forecast in Table 2-2-2-2.1.

iv

2） Qualitative impacts (Project)

Present status and problems Project countermeasures

(Grant aid project) Extent of project effects and

improvement

It was found out that T1 transformer had been loaded more than its capacity of 250 MVA during the peak hours of 4 months in 2015. At the same time, the load of T2 transformer (66 MVA) is limited to 50% due to its aging condition. Therefore, in case the T1 transformer becomes faulty, the overall operation of Infulene Substation may stop and it can influence other substations in Maputo metropolitan area. Power supply to Maputo metropolitan area is quite vulnerable and urgent countermeasures are required.

Existing 66 MVA T2 transformer will be replaced to 250 MVA transformer so that in total two units of 250 MVA transformers will be installed at Infulene Substation. It will continue the supply power even during the fault on T1 transformer.

According to the power flow forecasts in 2020, when the project will be completed, the loads of T1 transformer and T2 transformer (250 MVA each) will be 129 MW and 103 MW respectively. Therefore, even one of them becomes faulty, the other can continue the power supply (N-1 criteria), leading to the improvement of power supply stability in Maputo metropolitan area. Further, these transformers will be able to meet power demand increase until and beyond 2023

Oil circuit breaker of 66 kV double busbar at Infulene Substation used as a bus-coupler is deteriorating because it is aging. The circuit breaker indicates faulty performance such as breaking circuit with a lack of phases. Furthermore, the oil leakage is considered to have negative impacts on the environment.

Replacement of the existing oil circuit breaker to a reliable SF6 circuit breaker.

Due to the recovery of operation reliability of bus coupler, EDM can operate an uninterrupted 66 kV outgoing feeders switching. When the power demand increases in the future, the necessity of feeder switches will be more important, and the replacement of the circuit breaker is necessary.

Demand forecast indicates that the power demand at distribution substations situated in Maputo surrounding area will exceed the substation capacity, and it will not be possible to stop transformer operation for inspection and maintenance.

66/33 kV mobile substation will be procured.

One fundamental solution to realize the stable power supply is to increase the installed capacity of respective substations. However, expansion of substation capacity sometimes requires time and may not be conducted in a timely manner. Assuming the substation capacity will remain the same until 2020, overloading will be observed at some distribution substations, and there will be several distribution substations where they will not be able to stop transformer operation for inspection and maintenance. Through the utilization of mobile substation on the spot, the power supply will be continuously carried out, and they will be able to stop transformer operation for inspection and maintenance.

v

To sum up, since Project implementation can be expected to have major effects, it is confirmed to be

relevant for implementation under the Grant Aid scheme of the Government of Japan. Moreover, the

Mozambican side is deemed to possess adequate personnel and budget for implementing the Project

and conducting operation and maintenance after implementation.

Contents

Preface

Summary

Contents

Location Map of Project site / Perspective

List of Figures & Tables

Abbreviations

Chapter 1 Background of the Project

1-1 Background of the Project ...................................................................................................................... 1-1

1-2 Natural Conditions ................................................................................................................................... 1-2

1-2-1 Location / Topographic Condition .......................................................................................... 1-2

1-2-2 Geological Conditions ............................................................................................................ 1-2

1-2-3 Climate Conditions ................................................................................................................. 1-2

1-3 Observations on Mozambique Power Sector ........................................................................................ 1-4

Chapter 2 Contents of the Project

2-1 Basic Concept of the Project ........................................................................................................... 2-1

2-2 Outline Design of the Japanese Assistance ..................................................................................... 2-1

2-2-1 Design Policy .......................................................................................................................... 2-1

2-2-1-1 Design Policy for Infulene Substation ............................................................................ 2-1

2-2-1-1-1 Basic Policy ....................................................................................................................... 2-1

2-2-1-1-2 Plan for National Conditions ............................................................................................. 2-3

2-2-1-1-3 Plan for Socioeconomic Conditions .................................................................................. 2-4

2-2-1-1-4 Plan for Construction / Procurement Conditions .............................................................. 2-4

2-2-1-1-5 Plan for Using Local Contractors .................................................................................... 2-4

2-2-1-1-6 Plan for O&M Capacity of Implementing Agency ........................................................... 2-4

2-2-1-1-7 Planned Scopes Setting Grades for Facilities and Equipment .......................................... 2-4

2-2-1-1-8 Plan for Construction and Procurement Methods and Work Period ................................ 2-5

2-2-1-2 Design Policy for Mobile Substation .............................................................................. 2-5

2-2-1-2-1 Basic Policy ........................................................................................................................ 2-5

2-2-1-2-2 Plan for Natural Conditions ............................................................................................... 2-9

2-2-1-2-3 Plan for Operation and maintenance Capaciity of Implementing Agency ....................... 2-9

2-2-1-2-4 Planned Scopes Setting Grades for Equipment ............................................................... 2-10

2-2-1-2-5 Plan for Procurement Method and Work Period ............................................................. 2-10

2-2-2 Network Analysis .................................................................................................................. 2-10

2-2-2-1 Existing Network（2015） .......................................................................................... 2-10

2-2-2-2 Future Network（2020） ............................................................................................. 2-17

2-2-2-3 Conclusion .................................................................................................................... 2-23

2-2-3 Basic Plan ............................................................................................................................. 2-23

2-2-3-1 Overall Plan .................................................................................................................. 2-23

2-2-3-2 Basic Plan Overview ..................................................................................................... 2-23

2-2-3-3 Substation Equipment ................................................................................................... 2-25

2-2-3-4 Foundation Construction ............................................................................................ 2-29

2-2-4 Outline Design Drawing ....................................................................................................... 2-30

2-2-5 Implementation Plan ............................................................................................................. 2-41

2-2-5-1 Implementation Policy .................................................................................................. 2-41

2-2-5-2 Implementation Conditions........................................................................................... 2-42

2-2-5-3 Scope of Works ............................................................................................................. 2-42

2-2-5-4 Consultant Supervision ................................................................................................. 2-44

2-2-5-5 Quality Control Plan ..................................................................................................... 2-46

2-2-5-6 Procurement Plan .......................................................................................................... 2-46

2-2-5-7 Operational Guidance Plan ........................................................................................... 2-47

2-2-5-8 Soft Component (Technical Assistance) Plan ............................................................... 2-47

2-2-5-9 Implementation Schedule ............................................................................................. 2-47

2-3 Obligations of Recipient Country ................................................................................................. 2-47

2-4 Project Operation Plan .................................................................................................................. 2-48

2-4-1 Basic Plan ............................................................................................................................. 2-48

2-4-2 Regular Inspection Policy ..................................................................................................... 2-49

2-4-3 Spare Parts Procurement Plan ............................................................................................... 2-49

2-5 Project Cost Estimation ................................................................................................................ 2-51

2-5-1 Initial Cost Estimation .......................................................................................................... 2-51

2-5-2 Operation and Maintenance Cost .......................................................................................... 2-51

Chapter 3 Project Evaluation

3-1 Preconditions .................................................................................................................................. 3-1

3-2 Necessary Inputs by Recipient Country .......................................................................................... 3-1

3-3 Important Assumptions ................................................................................................................... 3-2

3-4 Project Evaluation ........................................................................................................................... 3-2

3-4-1 Relevance ................................................................................................................................ 3-2

3-4-2 Effectiveness ........................................................................................................................... 3-4

[Appendices]

1. Member List of the Study Team ................................................................................................ A-1-1

2. Study Schedule ......................................................................................................................... A-2-1

3. List of Parties Concerned in the Recipient Country ................................................................. A-3-1

4. Minutes of Discussions ............................................................................................................. A-4-1

5. Field Report .............................................................................................................................. A-5-1

6. Topographic & Geotechnical Survey Report ............................................................................ A-6-1

7. Transportation Route of Mobile Substation to Matola Gare Substation ................................... A-7-1

MARRACUENE

MAPUTO

MATOLA

SE9

SE8

SE5

SE2

CTM

SE7

SE3SE1

Legend

0             2.0         4.0km

BELULUANE

MACHAVA

■Republic of Mozambique

■Map of Africa

■Maputo metropolitan area

LOCATION OF THE PROJECT SITE

SE4

SE6

MATOLA RIO

← R. Garcia

← Arnot (South Africa)

[Source] Prepared by Preparatory Survey Team based on P.39, Chapter 4, Volume III, Master Plan Update Project, 2012‐2027 (2014)

ZIMPETO

MANHICA↑

SE11INFULENE

(Scope of rehabilitation of substation equipment)

CIMENTOS

MOZAL

MATOLA GARE(Scope of procurement of mobile substation)

Legend

CHICUMBANE

RESSANO GARCIA

KOMATIPORT(South Africa)

BELULUANE

BOANE

CORUMANALIONDE

275kV

132kV

275kV

11kV

110kV

11kV

110kV

66kV

33kV

66kV

275kV

66kV

132kV

125MVA

125MVA

G 175MW G 121

MW

9MVA

G8.3MW

110kV

33kV

10MVA

LINDELA

110kV

33kV

16MVA

16MVA

110kV

33kV

40MVA

MACIA

110kV

33kV

16MVA

XINAVANE

110kV

33kV

40MVA

66kV

33kV

30MVA

MARRACUENE

66kV

33kV

20MVA

MANHICAZIMPETO

66kV

33kV

40MVA

SE11

66kV

33kV

30MVA

SE9

30MVA

11kV

66kV

11kV

30MVA

SE4 66kV

11kV

30MVA

SE8

66kV

11kV

20MVA

SE5

20MVA

66kV

11kV

30MVA

SE3

30MVA

66kV

11kV

30MVA

SE1

66kV

11kV

30MVA

SE2

66kV

11kV

30MVA

SE7

66kV

11kV

40MVA

SE6

24MVA

66kV

33kV

30MVA

MACHAVA

30MVA

66kV

33kV

30MVA

C.T.M

30MVA G

100MWclass

400kV

275kV

400MVA

400MVA

500MVA

500MVA

500MVA

80MVA

160MVA

11kV

66kV

G 40MW

66kV

33kV

10MVA

SALAMANGA

10MVA

66kV

CIMENTOS

P.MOZAL

66kV

33kV

MATOLA RIO

30MVA

66kV

33kV

30MVA

66kV

33kV

30MVA

MATOLA GARE

10MVA

66kV

275kV

120MVA

30MVA

30MVA

250MVA

MATOLA

MAPUTOINFULENE

AMOT(South Africa)

EDWALENI(Swaziland)

G8.3MW

DZIMBENE

66kV

11kV

SE FACIM

MOZAL

66kV

33kV

40MVA

66kV

33kV

LINGAMO

40MVA

40MVA

66kV

275kV

120MVA

120MVA

BELULUANE

KUVANINGFI

110kV

11kV

MAPAI

110kV

33kV

16MVA

MASSINGA

110kV

33kV

40MVA

275kV

110kV

10MVA

3MVA

33kV

9MVA

To be discommisioned by 2020

To be discommisioned by 2020

To be discommisioned by 202033kV 33kV

G 95MW

250MVA

250MVA

Southern Transmission System in 2016

Perspective of Infulene Substation

List of Figures and Tables Chapter 1

Figure 1-2-1.1 Mozambique Topography ............................................................................ 1-2

Figure 1-2-3.1 Average Temperature (Normal Value) ........................................................ 1-3

Figure 1-2-3.2 Average High Temperature (Normal Value) ............................................... 1-3

Figure 1-2-3.3 Average Low Temperature (Normal Value) ................................................ 1-3

Figure 1-2-3.4 Precipitation (Normal Value) ....................................................................... 1-4

Figure 1-2-3.5 Most Rainfall Reported in a Month (Normal Value) ................................... 1-4

Figure 1-2-3.6 Average Wind Speed (Normal Value) ......................................................... 1-4

Table 1-2-3.1 Average Temperature (Normal Value) ........................................................ 1-3

Table 1-2-3.2 Average High Temperature (Normal Value) ............................................... 1-3

Table 1-2-3.3 Average Low Temperature (Normal Value) ................................................ 1-3

Table 1-2-3.4 Precipitation (Normal Value) ....................................................................... 1-4

Table 1-2-3.5 Most Rainfall Reported in a Month (Normal Value) ................................... 1-4

Table 1-2-3.6 Average Wind Speed (Normal Value) ......................................................... 1-4

Chapter 2

Figure 2-2-1-1-1.1 Power flow in 2020 (Shown in Figure 2-2-2-2.2) ........................................ 2-2

Figure 2-2-1-1-1.2 Load current in 2023 .................................................................................... 2-3

Figure 2-2-1-2-1.1 Current condition of the operation of 66/33 kV mobile substation (10 MVA) ...........................................................................................................

2-7

Figure 2-2-1-2-1.2 The connection of the mobile substation at Matola Gare Substation ........... 2-9

Figure 2-2-2-1.1 Configuration and the zonal classification of EDM Southern network ....... 2-11

Figure 2-2-2-1.2 Transmitting capacity and line length .......................................................... 2-12

Figure 2-2-2-1.3 Actual power flow recorded at 20:00 in July 2015 ...................................... 2-13

Figure 2-2-2-1.4 Fault current analysis result at 20:00 in July 2015 ....................................... 2-14

Figure 2-2-2-2.1 Network development plan (2015–2020)..................................................... 2-18

Figure 2-2-2-2.2 Power flow in 2020 ...................................................................................... 2-19

Figure 2-2-2-2.3 Fault current analysis result ......................................................................... 2-20

Figure 2-2-5-4.1 Project Relation Diagram ............................................................................. 2-45

Figure 2-2-5-9.1 Project Implementation schedule ................................................................. 2-47

Figure 2-4-1.1 Project implementation structure ................................................................. 2-48

Table 2-2-1-1-1.1 Allowable current of each busbar ................................................................ 2-2

Table 2-2-1-1-2.1 The design condition for natural condition .................................................. 2-4

Table 2-2-1-2-1.1 Power demand forecast by System Planning Department, EDM ................. 2-6

Table 2-2-1-2-1.2 Power supply situation at distribution substations in Maputo metropolitan area .........................................................................................

2-7

Table 2-2-2-1.1 Stability analysis cases ................................................................................. 2-15

Table 2-2-2-1.2 Stability analysis results (Year 2015) .......................................................... 2-16

Table 2-2-2-2.1 Demand forecast by System Planning Dep. of EDM ................................... 2-17

Table 2-2-2-2.2 Power development plan of EDM from 2015 to 2020 ................................. 2-17

Table 2-2-2-2.3 Fault current analysis result (comparison between 2015 and 2020) ............ 2-20

Table 2-2-2-2.4 Analysis cases (Year 2020) .......................................................................... 2-21

Table 2-2-2-2.5 Stability analysis results ............................................................................... 2-22

Table 2-2-3-1.1 Power system of each voltage class ............................................................. 2-23

Table 2-2-3-2.1 Vehicle requirement ..................................................................................... 2-25

Table 2-2-3-3.1 Basic plan ..................................................................................................... 2-25

Table 2-2-3-3.2 Basic specification of the equipment ........................................................... 2-26

Table 2-2-3-4.1 Foundation design condition ........................................................................ 2-29

Table 2-2-4.1 Outline design drawing list .......................................................................... 2-30

Table 2-2-5-3.1 Work Demarcation for the Project ............................................................... 2-43

Table 2-2-5-4.1 Engineers to be dispatched by the Supplier ................................................. 2-46

Table 2-4-3.1 Spare parts list for 275/66/11kV Three-phase Autotransformer .................. 2-50

Table 2-4-3.2 List of spare parts for 66kV lightning arrester ............................................. 2-50

Table 2-4-3.3 List of spare parts for 66kV current transformer ......................................... 2-50

Table 2-4-3.4 List of spare parts for 66kV circuit breaker ................................................. 2-50

Table 2-4-3.5 List of spare parts for 66kV disconnecting switch ....................................... 2-50

Table 2-4-3.6 List of spare parts for protection and control & relay panels for T2 transformer ...................................................................................................

2-51

Table 2-5.1 Condition of the cost estimation .................................................................. 2-51

Table 2-5.2 Breakdown of costs borne by the Mozambican side .................................... 2-51

Abbreviations

AfDB African Development Bank

ANE National Road Administration

E/N Exchange of Notes

EDM Electricidade de Mozambique

EIB European Investment Bank

G/A Grant Agreement

GDP Gross Domestic Product

HCB Hydroelectrica de Cahora Bassa

IEC International Electrotechnical Commission

IPP Independent Power Producer

JEC Japan Electrotechnical Committee

JEM Standards of Japan Electrical Manufacturers' Association

JICA Japan International Cooperation Agency

JIS Japanese Industrial Standards

KfW Kreditanstalt für Wiederaufbau

KPI Key Performance Indicator

MIREME Ministerio dos Recursos Minerais e Energia

MOPH Ministry of Public works & Housing

MOTRACO Mozambique Transmission Company

OJT On the Job Training

PM Project Manager

PPA Power Purchase Agreement

SADC Southern African Development Community

SAPP South Africa Power Pool

SCADA Supervisory Control and Data Acquisition System

SEC Swaziland Electricity Company

STIP Short Term Investment Program

UNDP United Nations Development Programme

VAT Value Added Tax

CHAPTER 1 BACKGROUND OF

THE PROJECT

1-1

Background of the Project Background of the Project

Mozambique is a country of Southern Africa, on the shore of Indian Ocean, with a population of twenty seven million, and it occupies a land area of about two times larger than that of Japan. In the 15th century, Portuguese reached the land for the first time as westerners, and colonized the land in 17th century. In 20th century, anti-colonialism became active and popular, and in 1975 Mozambique attained its independence. However, civil war started after the independence and lasted until 1992. After a peace process which continued for two years, a general election under the multi-party system was held for the first time in October 1994, and the multi-party political system has continued since then.

With peace settled down and abundant natural resources such as natural gas and coal, Mozambican economy started to grow during the second half of 1990s recording annual growth rate of 6%. After recovering from huge flooding in 2000 and 2001, industrial development started in 2005. The development of industrial areas in Matola and Tete where coal is produced, the new mine development in Mona, Nampla, the extraction of natural gas and the activation of economic activities by discovery of new natural gas resources on the coast of Cabo Delgado in Inhanbane and the further development of industrial area in Nacala, Beira and Matola and others have continued, and contributed to the annual economic growth rate of 7% to 8% in recent years. Because of this rapid economic growth, Mozambique is expected to be one of the countries in the world that will attain the highest economic growth during the coming ten years.

With the high economic growth rate, electric power demand is also increasing rapidly with an annual rate of about 10%. However, dilapidated transmission lines and equipment of the existing transmission, substation and distribution system, are still found; therefore, reinforcement of the system to meet increasing power demand is urgently necessary. The suppressed demand in Maputo and surrounding areas cannot be overlooked.

Infulene Substation, the target site of this grand aid project, is the central substation that supplies electricity to Maputo metropolitan and its surrounding areas in the southern power system. However, the existing T2 transformer installed in 1971 is dilapidated, and it has reduced its supply reliability considerably. In fact, its load is limited to approximately 50% of its rated capacity due to decline of electric supply reliability. Under these circumstances of Infulene Substation, the Government of Mozambique made the request of this project to the Government of Japan in order to improve the quality of electricity supply in Maputo metropolitan areas and make it stable. This project will replace the existing T2 transformer with a new transformer of larger capacity as urgent renovation, and the switchgear of T2 transformer bay of primary and secondary sides will be investigated for necessary renovation and reinforcement. Further, the procurement of mobile substation will be investigated so that the mobile substation can be used at distribution substations in Maputo surrounding areas.

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Natural Conditions

1-2-1 Location / Topographic Condition

Mozambique is located in seaside of the southeast Africa continent, and the country is divided to two parts by the Zambezi River. There are hills and low tableland from gradual coastline to inland and more west side become plateau area in the North area of the Zambezi River. There is large lowland in the South area of the Zambezi River and Mashonaland table land and Lembo highland at the Deep South.

The Project site located on the west side of Maputo ( a city in the southernmost of the country) gulf and estuary of Tembe River in Mozambique (Figure 1-2-1.1).The area of Maputo is 346.8 km² and the population is 2.88 million (INE/ Instituto Nacional de Estatística de Moçambique estimation / 2015).

Source: JICA Study Team based on http://www.lib.utexas.edu

Figure 1-2-1.1 Mozambique Topography

1-2-2 Geological Conditions

Mozambique is located in Neoproterozoic (approximately 800-500 million years ago) orogenic zone at the converging point between the Mozambique area Northeast stratums sloped to North-South direction and Zambezi area sloped to East-West direction. The structure of a geologic stratum in Maputo is covered by Quaternary sand stratum on Tertiary sandstone stratum.

The result of the soil investigation at the Infulene Substation shows alluvium fine grained silty sand alluvium layer from ground level to -3.0 m and diluvium Quaternary fine grained silty sand from -3.0 m to -19.0 m.

1-2-3 Climate Conditions

Mozambique climate is classified tropical, arid and temperate zone by Köppen climate classification. Maputo climate is easy to bear tropical savanna climate and the average temperature is under 20 degrees from May to September. But the highest and the lowest temperatures recorded in Maputo are 42 degrees and -2 degrees, respectively.

Rainy season is from October to March and the average precipitation is 770 mm, although the highest rain reported in a year is 1,450 mm; the rainiest month reported in Maputo is January.

The following Tables and Figures are temperature (Table 1-2-3.1 and Figure 1-2-3.1 below show monthly average temperature, Table 1-2-3.2 and Figure 1-2-3.2 show monthly average high temperature, Table 1-2-3.3 and Figure 1-2-3.3 show monthly average low temperature, Table 1-2-3.4 and Figure 1-2-3.4 show monthly precipitation, Table 1-2-3.5 and Figure 1-2-3.5 show monthly most rainfall and Table 1-2-3.6 and Figure 1-2-3.6 show monthly average wind speed in Maputo.

Lebombo

Mashonaland

Zambezi River

Maputo

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Table 1-2-3.1 Average Temperature (Normal Value) Unit: ˚C

Month Average

Temperature Month

Average Temperature

Jan 27.0 July 19.0

Feb 27.0 Aug 21.0

Mar 26.0 Sept 22.0

Apr 24.0 Oct 23.0

May 22.0 Nov 24.0

June 20.0 Dec 26.0

Average 23.4

Source: JICA Study Team based on weatherbase.com

Source: weatherbase.com Figure 1-2-3.1 Average Temperature (Normal Value)

Table 1-2-3.2 Average High Temperature (Normal Value)

Unit: ˚C

Month Average

High Temperature

Month Average

High Temperature

Jan 30.0 July 23.0

Feb 30.0 Aug 25.0

Mar 29.0 Sept 25.0

Apr 27.0 Oct 26.0

May 26.0 Nov 27.0

June 24.0 Dec 29.0

Average 26.8

Source: JICA Study Team based on weatherbase.com

Source: weatherbase.com Figure 1-2-3.2 Average High Temperature (Normal Value)

Table 1-2-3.3 Average Low Temperature (Normal Value)

Unit: ˚C

Month Average

Low Temperature

Month Average

Low Temperature

Jan 24.0 July 15.0

Feb 23.0 Aug 16.0

Mar 23.0 Sept 18.0

Apr 21.0 Oct 20.0

May 18.0 Nov 21.0

June 15.0 Dec 23.0

Average 19.8

Source: JICA Study Team based on weatherbase.com

Source: weatherbase.com Figure 1-2-3.3 Average Low Temperature (Normal Value)

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Table 1-2-3.4 Precipitation (Normal Value) Unit: mm

Source: weatherbase.com

Month Precipitation Month Precipitation

Jan 150.0 July 10.0

Feb 130.0 Aug 10.0

Mar 90.0 Sept 30.0

Apr 5.0 Oct 50.0

May 20.0 Nov 70.0

June 10.0 Dec 90.0

Average 770.0

Source: JICA Study Team based on weatherbase.com

Figure 1-2-3.4 Precipitation (Normal Value)

Table 1-2-3.5 Most Rainfall Reported in a Month (Normal Value)

Unit: mm

Month Most

Rainfall Month

Most Rainfall

Jan 800.0 July 160.0

Feb 500.0 Aug 70.0

Mar 560.0 Sept 320.0

Apr 350.0 Oct 220.0

May 150.0 Nov 370.0

June 240.0 Dec 240.0

Average 1,450.0

Source: JICA Study Team based on weatherbase.com

Source: weatherbase.com Figure 1-2-3.5 Most Rainfall Reported in a Month (Normal Value)

Table 1-2-3.6 Average Wind Speed (Normal Value) Unit: km/h (m/s)

Month Average Wind

Speed Month

Average Wind Speed

Jan 17.0（4.7） July 14.0（3.9）

Feb 17.0（4.7） Aug 16.0（4.4）

Mar 16.0（4.4） Sept 20.0（5.6）

Apr 16.0（4.4） Oct 22.0（6.1）

May 14.0（3.9） Nov 20.0（5.6）

June 12.0（3.3） Dec 19.0（5.3）

Average 16.9（4.7）

Source: JICA Study Team based on weatherbase.com

Source: weatherbase.com Figure 1-2-3.6 Average Wind Speed (Normal Value)

Observations on Mozambique Power Sector

It is important to note that power industry is a commercial industry that sustains its business operations including investment on its own. Considering these characteristics of power industry, we have observed the following issues that have to be addressed.

(1) Organizational System for Planning Work

Power industry has one unique characteristic different from other industries, which is production and consumption take place simultaneously at the same volume through an engineering system. This engineering system, or electric power system, takes a lot of time and money to be developed. The process of developing power system starts with demand forecast, then power system analysis,

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preparation of mid- and long-term power system development plan based on least cost method (Master Planning), selection of priority projects and implementation of feasibility study, and financial arrangement and construction. It is important for a power company to follow this process of power system development effectively and efficiently. In this process planning work covers demand forecast, power system analysis, master planning, selection of priority projects and implementation of feasibility study. According to our experience with EDM, it seems demand forecast, prioritization of projects for implementation and some other work might not be conducted as an organizational business system. Planning work has to be conducted through data and information exchanges with other departments and divisions. Important data and information for a power company including demand forecast and prioritized projects have to be prepared, authorized, stored and shared through an organizational business system, which would be one of the important issues for EDM to improve business efficiency and effectiveness as an organization.

(2) Generation Expansion Planning based on Least Cost Method

We understand the present generation mix of the power systems in Mozambique has not been formed based on the least cost method. Mozambique is endowed with abundant energy resources of natural gas, coal and hydropower. It is necessary to utilize these energy resources and follow the least cost method in order to develop power generation in Mozambique considering the maintenance cost including not only initial investment but also fuel cost for operation. If the private investment of Independent Power Producer (IPP) is utilized for constructing power generation, IPP should be procured through competitive bidding based on the feasibility study EDM prepares by itself using consultants.

(3) Setting Electricity Tariff that can recover supply cost

It seems the present electricity tariff is not good enough to recover supply cost. In many African countries, it had been observed that electricity tariff was set at cheap price because people’s income is low. However, it seems this idea of cheap electricity price is being corrected by the idea of appropriate or reasonable electricity price. As EDM cannot recover its supply cost, it would not be able to secure enough budgets for repair, renovation and reinforcement, which would result in deficiencies of quantity and quality of electricity supply. The deficiencies in electricity supply would hinder industrial development that is necessary for poorer people to increase job opportunities. Poverty alleviation could be attained through increasing job opportunities, which would be made possible by industrial development. Industrial development requires good quality and quantity of electricity supply at reasonable electricity price that enables EDM to recover its supply cost.

(4) Autonomous and Proactive Technical Management

Because EDM’s financial foundation is weak and much of its investment is dependent on development partners’ assistance, we observed some areas where the weak financial foundation may have been hindering the prompt repair and renovation that are urgently necessary to avoid serious accidents. In this regard, CEO of EDM has made it priority to achieve efficient electricity prices and improve EDM's business operation by around 2019 or 2020. It is desirable to strengthen the finance basis and encourage proactive technical management.

(5) EDM’s Efforts to reduce supply cost and Appropriate Regulation

An electric power company needs to take its efforts to reduce supply costs and increase electric supply reliability in order to avoid raising electricity prices. For this reason, it is necessary to introduce appropriate regulation, which would work well in existing conditions and situations in Mozambique, and can promote EDM’s efforts to reduce its supply costs and increase electric supply reliability.

CHAPTER 2 CONTENTS OF

THE PROJECT

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Chapter 2 Contents of the Project Basic Concept the Project

(1) Overall goal of the Project

Electricidade de Mozambique (EDM) formulated Master Plan Update report in 2014. This power master plan lists projects to be prioritized in Northern Region, Central Region and Southern Region from 2014 to 2018, as ‘Priority projects by region 2014-2018’ 1 . Since rehabilitation of T2 transformer (250 MVA), switchgear, and control and protection equipment at existing Infulene Substation is one of the priority projects, the achievement of this master plan is the upper level goal of the Project.

However, the government of Mozambique faces difficulties in implementing the power related project in line with this master plan. Therefore, the government of Mozambique requested the assistance on the rehabilitation of Infulene Substation aiming the stable power supply to Maputo metropolitan area to the government of Japan.

(2) Outline of the project

This project aims to achieve a stable power supply to Maputo metropolitan area through the procurement of new 250 MVA transformer and relevant switchgears to replace the aging T2 transformer (66 MVA) and its relevant switchgears at Infulene Substation, which will lead to the improvement of people’s lives in this area and the promotion of socioeconomic activities.

In addition, at present situation, 66/33 kV distribution substations located in Maputo surrounding area are forecasted to be overloaded because of the shortage of capacity with the consideration of the growth of power demand. To address this situation, a mobile substation will be procured for the stable power supply in this area.

Outline Design of the Project

2-2-1 Design Policy

Design Policy for Infulene Substation

2-2-1-1-1 Basic Policy

(1) Prerequisite for the selection of the equipment

Figure 2-2-1-1-1.1 shows the power flow at Maputo metropolitan area in 2020. The load of 103 MW is forecasted at T2 transformer at Infulene Sustation, which is converted to 114.5 MVA in the case that the power factor is 0.9. Furthermore, if the power demand at the southern region increases 12.9% annually as System Planning Derectorate forecasts (Refer to Table 2-2-2-2.1 as well), the load of T2 transformer in 2023, 3 years after the project completion, will be 148 MW (164 MVA).

As the government of Mozambique requested and as the master plan shows as ‘Priority projects’, if T2 transformer is upgraded to 250 MVA, the capacity utilization rate will be 45.7% in 2020 and 65.6% in 2023. Considering the urgency of JICA grant aid project, these figures show that the capacity is adequate to sustain the load until 2023. This section examines other equipment on condition that the capacity of the new T2 transformer will be 250 MVA.

1 P.96, Chapter 7 Transmission System Plan, Volume III Main Report

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Source: Prepared by JICA Study Team based on the data provided by EDM

Figure 2-2-1-1-1.1 Power flow in 2020 (Shown in Figure 2-2-2-2.2)

(2) Scope of the component

As the T2 transformer will be upgraded from 66 MVA to 250 MVA, these switchgears (the primary side and the secondary side) have to be upgraded as well to meet the required specification. Infulene Substation is connected from the upper substations through 2 circuits of 275 kV transmission lines (transmission capacity of 479 MVA/circuit, 958 MVA in total). As the total capacity of 275 kV transformer is above 870 MVA, there is no problem observed under the normal operation.

The following section examines the necessity of 275 kV double busbars and 66 kV double busbars under the load forecast in 2023. Table 2-2-1-1-1.1 shows the allowable current of 275 kV and 66 kV busbars.

Table 2-2-1-1-1.1 Allowable current of each busbar

Equipment Allowable current (A)

275 kV double busbar 1,300

66 kV double busbar 1,900

Source: Prepared by JICA Study Team based on the data provided by EDM

According to Figure 2-2-1-1-1.1, the load on 66 kV feeders in 2020 will be 315 MW in total, equivalent to 350 MVA with a power factor of 0.9. If the load is assumed to increase 12.9% annually, the supply of power to the load as of 2023 will be realized as Figure 2-2-1-1-1.2 shows.

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Y

Y

▽▽

Y

Y

Y

▽

▽

Y

29MVA

206MVA

206MVA

Y

Y

▽

Y

Y

▽

155MVA

371 MVA

61MVA

77MVA

88MVA

62MVA

48MVA

45MVA

75MVA

Matola Gare

CTM CTM CTMSE9 Machava SE8 Manhica

84MVA

19MVA

19MVA

Source: Prepared by JICA Study Team

Figure 2-2-1-1-1.2 Load current in 2023

According to the above operation, the highest loads emerging on each busbar will be highlighted by orange color and they will be 371 MVA and 206 MVA, respectively. These loads are converted to current as shown below, showing they are lower than the allowable currents on Table 2-2-1-1-1.1.

275 kV Busbar: 371 MVA / (√3×275 kV) ≒ 778 A ＜ 1,300 A

66 kV Busbar: 206 MVA / (√3×66kV) ≒ 1,802 A ＜ 1,900 A

In reality, even if the power demands will occur in Maputo metropolitan area as shown above, these demands will be spread among other substations. Therefore, the load at Infulene Substation will become even smaller. Furthermore, transmission substations like Infulene Substation are required to conduct stable operation based on N-1 criteria. Under the operation of Infulene Substation with the N-1 criteria, the highest allowable load of 275/66kV substation facilities will be 370MVA (i.e. T1 transformer:125MVA, T2 transformer: 125MVA and T3 transformer: 120MVA), which is far lower than the above assumptions.

This project will realize the rehabilitation of T2 transformer, and it is reasonable to conduct the rehabilitation of the busbar as an integrated component with the other upgrading such as transmission line, from the view of the southern system upgrading project after the completion of JICA master plan survey.

2-2-1-1-2 Plan for National Conditions

Infulene Substation is located at the 25.88˚S latitude, 32.54˚E longitude and altitude 58m. The highest and lowest temperatures recorded in Maputo are 42 degrees and -2 degrees, respectively.

The wind speed by weather base in Maputo is not more than 10.0 m/s, but the maximum instantaneous wind speed of 30.0 m/s has been recorded at Maputo International Airport (Mavalane). The design loads are estimated based on wind speed of 30.0 m/s and velocity pressure of 1.5kN/m2.

The design condition for a natural condition is shown in Table2-2-1-1-2.1. Based on this condition, the foundations for substation equipment were designed. Infulene Substation is located as far as 10km or more inside from the coast. Thus the location is out of ‘salt area’ which is usually regarded within 2km from the coastline, where the influence of salty dusts is considered to be large. Therefore, the natural condition does not consider influences caused by salty dusts.

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Table 2-2-1-1-2.1 The design condition for natural condition

Item Detail

Altitude 58m

Temperature Max 50ºC

Min 0ºC

Rainy Season From October to March

Most Rainfall 1,450mm

Thunderstorm 15days / year

Wind Speed 30m/s

Velocity Pressure 1.5kN/m2

Earthquake Shear Coefficient 0.1g

Source: JICA Study Team

2-2-1-1-3 Plan for Socioeconomic Conditions

Infulene Substation is one of three 275kV substations in southern area, which supply power to Maputo metropolitan area. Therefore, the necessity of stable power supply is remarkably high.

The operation of the substation in conformity with the N-1 criteria, which enables continuous power supply even if one of power transformers at a substation is not operational due to its fault etc., is required particularly for transmission substation. However, this criteria is not considered for the present operation of Infulene Substation. Therefore, when faults occur it is necessary to cut 66kV outgoing feeders which affects the power supply to consumers eventually. By bolstering the transformer capacity through this project, it is projected to reduce the frequency of power stoppage; thus it will contribute to the stable socioeconomic development. Since the existing T2 transformer is connected to CTM Substation providing the power with the load limitation of up to 33 MVA, the outage of this transformer during the project period will not affect the power supply to the consumers.

2-2-1-1-4 Plan for Construction / Procurement Conditions

Infulene Substation is located near the main road passing by the Maputo International Airport and it is merely approximately 20 km away from Port Maputo. Therefore, this substation is easily accessible and necessary materials and equipment can be relatively easily transported.

In Mozambique, some construction materials such as cements and timbers are domestically produced whilst other materials such as reinforcing steel are imported from South Africa. For these imported materials, a standard called South Africa Bureau of Standards (SABS) is applied and utilized without problems. Also, since there are some concrete plants in Maputo, ready-mixed concrete will be available.

During the project period, temporary store yard in Infulene Substation will be prepared for storing the construction materials with the consideration of countermeasures against theft.

2-2-1-1-5 Plan for Using Local Contractors

Any foreign company which conducts construction works in Mozambique has to apply for the construction permit and be registered by the Ministry of Public works & Housing (MOPH). The construction work under this Project is limited to the construction of foundations with reinforcing steel for the transformer, relevant switchgears and etc.. So medium scale companies in Mozambique can be engaged as subcontractors in this project.

2-2-1-1-6 Plan for O&M Capacity of Implementing Agency

EDM’s scope of work shall cover transmission and substation works and a part of generation work throughout Mozambique. EDM replaced 250 MVA autotransformer at Infulene Substation in 2013 and this is operational without problems. EDM is capable enough to operate and maintain the equipment to be installed by this project.

2-2-1-1-7 Planned Scopes Setting Grades for Facilities and Equipment

Considering the above-mentioned conditions, the scope of procurement and installation of equipment and the technical level is assumed as follows:

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(1) Scope of facility and equipment

To formulate the appropriate design technically and economically, the specification of equipment and materials used for this project will be in conformity with the international standard such as IEC as it is available. Also, the scope is considered to cover only minimum required composition (equipment facility, specification and quantity).

(2) Technical level

The specification of substation equipment to be procured by this project will be considered not to exceed the existing system level, from the views of the technical skills of operation and maintenance after the completion of this project.

2-2-1-1-8 Plan for Construction and Procurement Methods and Work Period

Equipment is mainly transported from Japan to Mozambique by sea. The inland transportation in Mozambique is limited to the 20 km distance from the port to Infulene Substation. The safety and transportation schedule is formulated considering the safety and transportation duration, permits and so on.

Work period needs to be formulated considering the following items:

The work place will be near the live equipment in Infulene Substation. Therefore, the work schedule has to put the maintenance plan of existing equipment into consideration to avoid any conflict of works.

Implementation of concrete works has to be avoided from October to March, when the precipitation is relatively large.

Since Mozambique was used to be a colony of Portugal, the influence of this legacy on its culture is large and the Christians account for approximately 40%. Therefore, ordinary social activities tends to be closed in Christmas season. Therefore, the actual progress of the installation work from the middle to the end of December needs to be avoided.

Design Policy for Mobile Substation

2-2-1-2-1 Basic Policy

(1) Purpose of use

Mobile substations will be mainly used for the following two purposes:

1) Provision of power to the rapidly growing power demand

As Table 2-2-1-2-1.1 shows, the power demand at Maputo metropolitan area is forecasted to increase. On the other hand, the development of distribution substations in this area does not meet the power demand and addressing issues such as a lack of substation capacity, inadequacy of the number of transformers at each substation etc. are urgent. In spite of this context, the development of substation facilities have not been implemented as scheduled due to difficulties of securing the financial sources.

Through the utilization of the mobile substation, it is expected to prevent the outage of power supply caused by overloading substations.

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Table 2-2-1-2-1.1 Power demand forecast by System Planning Directrate, EDM

Year 2015 2020 Growth rate (%) Maputo City 219 370 11.1

Maputo Province 167 330 14.6 Industries 17 17 0.0 L. South 57 130 17.7

Gen Southern 2 4 14.9 Total 463 850 12.9

Remark: Industries stand for Mozal and Cimentos, L. South: North-East Region, Gen Southern: Northern hydro area Source: EDM

2) Provision of power during the maintenance of fixed transformer

Distribution network of EDM is expanded like a loop-shape, and sources of distribution transformers connecting to distribution power network is controlled by the operation of switches installed along distribution lines. Through the operation of switches, the load of a certain transformer, which EDM is going to carry out the maintenance, becomes zero. However, when the overall power demand at Maputo metropolitan area increases, it will become impossible to handle the power demand with the remaining transformers, and as a result the management of the distribution by switching the load will become extremely difficult. Under such a situation, distribution of power will be continued through the temporary utilization of the mobile substation as a substitute for transformer which needs to be maintained.

Considering the above-stated present situation of the distribution network, the following items prove the necessity of mobile substations:

Distribution substation which the power demand will exceed the distribution capacity.

Distribution substation with one unit of transformer makes difficult the distribution network management and limits the inspection and maintenance of the transformer

Table 2-2-1-2-1.2 shows the necessity of the mobile substations. One 66/33 kV distribution substation shall face the overloading in 2020 and the number shall increase up to seven stations in 2023.

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Table 2-2-1-2-1.2 Power supply situation at distribution substations in Maputo metropolitan area

Substation Secondary

voltage (kV)

No. of transformer

units

Rated capacity (MVA)

Power demand [MVA] Necessity

2020 2023

Boane 33 1 30 25 36 〇 CTM 33 2 60 47 68 〇

Machava 33 2 60 46 66 〇 Manhica 33 1 30 12 17 ―

Marracuene 33 1 20 16 23 〇 Matola Gare 33 2 40 40 58 ◎ Matola Rio 33 1 30 27 39 〇 Salamanga 33 2 20 15 22 〇 Zimpeto 33 1 30 18 26 ―

SE11 33 1 40 11 16 ― Beluluane 11 1 10 7.8 11 ―

SE1 11 2 60 36 52 ― SE2 11 2 60 25 36 ― SE3 11 2 60 41 59 ― SE4 11 2 60 27 39 ― SE5 11 3 60 50 72 〇

SE6 33-11 1 40 (33 kV) 24 (11 kV) 27 39 ―

SE7 11 2 60 30 43 ― SE8 11 2 60 24 35 ―

SE9 11 33

1 (11 kV) 1 (33 kV) 60 24 35 ―

Remark: ◎: Forecasted to be overloaded in 2020, 〇:Forecasted to be overloaded in 2023, -: Other Source: Prepared by JICA Study Team based on the data provided by EDM

(2) Operation method

Majority of mobile substations manufactured in Europe is composed of one unit of vehicle, which has main transformer, primary voltage switchgear, secondary voltage switchgear and control and protection equipment. All the six units of mobile substations that EDM owns are the same type. Figure 2-2-1-2-1.1 illustrates the mobile substation (10 MVA) currently under operation. The primary side (66 kV) is connected through the overhead conductor via temporary wooden pole, and the secondary side (33 kV) is connected to the underground through the temporary wooden gantry.

Figure 2-2-1-2-1.1 Current condition of the operation of 66/33 kV mobile substation (10 MVA)

Primary side Secondary side

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When this type of mobile substation is applied, only the connections (i) between the system and the primary side and (ii) between secondary side (switchgear or cubicles) and the system need to be considered. Therefore the connection method is rather simple. However, as all the equipment is embedded in the large size trailer, the trailer length increases and the weight become bigger as well; therefore, the following challenges on operation shall appear:

1) As the size and weight of the trailer increase, it may affect the road regulation (i.e. vehicle length: 22 m or less, total weight: 48 t or less2).

2) Due to the increase of the weight, the degree of accessible slopes (climb up and down) shall be limited.

3) Due to the long length of the trailer, the accessibility to the narrow road is limited.

4) Since the equipment will be embedded in the trailer in a row, the flexibility of equipment arrangement in the substation is low. If the available land for the arrangement of mobile substation is narrow, the mobile substation may not be utilized in the worst scenario.

Although all-in-one type of mobile substation has an advantage of the connection, its accessibility and the flexibility of arrangement is not sufficient, resulting in the difficulties in handling and full utilization. Similar situation is observed in other African countries. This is partly the reason why the mobile substation tends to be utilized at one substation like a permanent substation.

A possible solution to the above challenges is to utilize the compact type of mobile substation, which comprised of ‘Vehicle 1’ with the primary side switchgear and main transformer and ‘Vehicle2’ with the secondary switchgear and control/protection equipment. Due to this composition, the following advantages are gained:

1) Mobile substation is deployed to the rather limited space.

2) Due to the smaller size and weight of trailer, the accessibility to various substations which are located on the hill, with narrow access roads etc. increases.

Moreover, since the transportation will be achieved relatively easily, the use of the mobile substation like a fixed transformer will be less likely and the mobile substation is expected to be utilized for its ‘original’ purpose. Compact type mobile substation, comprised of two vehicles (one trailer for primary switchgear and transformer and one truck for secondary switchgear and protection facilities) has been developed in Japan to follow the strict road regulation. Therefore, the Project shall procure the compact type mobile substation.

Figure 2-2-1-2-1.2 shows the connection of the mobile substation to Matola Gare Substation as an example. Although one of the two transformers in this substation, got faulty, it continues to be utilized due to the public requirement of the uninterrupted power supply.

2 In case that the number of axle is six.

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Source: JICA Study Team based on data provided by EDM

Figure 2-2-1-2-1.2 The connection of the mobile substation at Matola Gare Substation

In this case, through the application of ‘trailer 1’, the 66 kV side of existing facility shall be connected to the existing 33 kV cubicles through the 66kV switchgear and main transformer of the mobile substation and existing 33 kV cable. This arrangement is also advantageous in terms of the accessibility of the mobile substation. Hence the compact-type mobile substation shall facilitate the maintenance of power transformer easily.

2-2-1-2-2 Plan for Natural Conditions

The mobile substation needs to be furnished enough to be operated against harsh conditions such as salt pollution as the natural conditions where the mobile substation will be utilized vary depending on sites. Therefore, the porcelain bushing, station post insulator, painting etc. have to be durable sufficiently for such conditions.

2-2-1-2-3 Plan for Operation and maintenance Capacity of Implementing Agency

Mobile substation is required to be instantly transported to the site from the place where it is stored, and its function has to be fully realized on the spot. To achieve this, the regular inspection of vehicle, substation equipment and control power source (especially the battery) is indispensable. Thus, the on-the-job training (OJT) when it is procured, provision of manual and checklist, and the technical transfer on the maintenance method are required. By carrying out the necessary operation and maintenance items,

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the mobile substation will be maintained in an appropriate condition.

2-2-1-2-4 Planned Scopes Setting Grades for Equipment

In general, a mobile substation is considered to be used as an emergency transformer at two or more power station/substations. Therefore, the road regulation for the transportation, which is applied to the general vehicle, needs to be applied to mobile substations as well. Otherwise, the mobile substation will potentially raise problems on the traffic and road maintenance in the future. The substation capacity and vehicle specification (size and weight) need to be designed.

2-2-1-2-5 Plan for Procurement Method and Work Period

As for the installation method, the mobile substation will be connected from the existing 66kV facilities through one of the two methods: the temporary power conductor with the construction of power poles or temporary power cable up to the 66kV disconnector. The same method will be applied to the secondary voltage side. As for the procurement method, the vehicle form will be designed in conformity with the road and traffic regulations. The mobile substation will be procured in before the installation of T2 transformer at Infulene Substation and will be in use after the initial operation training.

2-2-2 Network Analysis

Analyses for the networks before and after the project were conducted to examine effectiveness of the project. The existing network was analyzed as the one before the project and the network after completion of the project was analyzed as the one after the project.

Existing Network (Year 2015)

(1) Network configuration

The configuration and the zonal classification of EDM Southern network are shown in Figure 2-2-2-1.1.

The Southern network belongs to the South Africa Power Pool (SAPP). The power generated by Cahora Bassa Hydro Power Plant is transmitted to South Africa through DC transmission line, and the AC power converted from DC at the DC/AC converter station is transmitted to EDM Southern network through 400kV or 275kV international transmission lines. The interconnection points are 400kV Maputo Substation and 275kV Ressano Garcia Substation.

The power received at 400kV Maputo Substation is transformed to 275kV there and transmitted to Matola Substation. The power received at 275kV Ressano Garcia Substation and also the power generated by thermal power plants located in the vicinity are transmitted to Infulene Substation. The power transformed down from 275kV to 66kV at Matola Substation and Infulene Substation is transmitted to distribution substations through 66kV local network. In addition, 110kV network extends north-eastward to more than 400 km.

The Southern network can be divided into 5 network areas: Maputo City, Maputo Province of surrounding area of Maputo City, L. South of north-east area, Gen South of power supply regions in the northern area and Industries of industrial area in Matola region. Since the demand composition is different by each area, the demand growth rate differs among the areas.

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CTM

SE2SE3

SE1

P.Mozal

Cimentos

Matola Rio

Boane

Beluluane

Mozal

Matola

Machava

Matola Gare

SE8

SE5SE7

SE6

SE9

Maputo

R. Garcia

Macia

Salamanga

Manhica

Xinavane

Lionde

Zimpeto

Chicumbane Lindela

SE11

Corumana

KomatiportSouth Africa

SE4

Infulene

Marracuene

Lingamo

Beluluane

SE Facim

Maputo City

Maputo Province

L. South

Gen Southern

Industries

400kV AC

275kV AC132kV AC

110kV AC

66kV AC

Power station

Substation

Legend

Source: JICA Study Team based on network analysis data provided by EDM

Figure 2-2-2-1.1 Configuration and the zonal classification of EDM Southern network

(2) Transmitting capacity

Figure 2-2-2-1.2 shows the transmitting capacity and line length.

The transmitting capacity of almost all 66kV supply lines from Infulene Substation is small, 38–50MVA. Since this causes big problem to supply to Maputo City, EDM has been promoting plans to increase the capacity to 120MVA by rebuilding transmission towers, and some projects are expected to be completed in the near future. Figure 2-2-2-1.2 shows the detail.

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Source: JICA Study Team based on network analysis data provided by EDM

Figure 2-2-2-1.2 Transmitting capacity and line length

(3) Actual record of power flow

Figure 2-2-2-1.3 shows the actual power flow recorded at 20:00 in July 2015 when the previous maximum demand was broken.

The total demand was 463MW except a non-interconnected load to the main grid; meanwhile the total supply power was 470MW consisting of 173MW generated by IPP located in Ressano Garcia, 40 MW of Beluluane Power Plant and 257MW of interchange power from South Africa through international lines.

Since 66kV circuit breaker in CTM Substation exploded, 66kV bus has been out of operation. In order to supply power to the distribution network, EDM directly connected 66/33kV 30MVA transformer to lines from Infulene Substation and Matola Substation, and also directly connected two circuits from Matola Substation to one circuit from SE2 Substation and one circuit from SE3 Substation.

This abnormal network configuration as an emergency evacuation measure causes overloading problem in one of the three circuits from Infulene to CTM Substation, whose power flow is 48MW against 38MVA of transmitting capacity. However, it can be thought that the overloading problem does not actually come up because the peak demand occurred at nighttime (20:00) when temperature rise caused by solar radiation is not necessary to be taken account. But this unusual situation should be resolved as soon as practicable.

Moreover, the capacity of an existing T2 transformer in Infulene Substation was assumed to be operated with a half capacity. Operating this transformer in parallel with other transformers would have created an overloading risk. As a result, this transformer was treated as an idle facility. For this reason, overloading problem would occur under contingency condition of T1 transformer (capacity 250MVA), since the power flows of T1 transformer and T3 transformer (capacity 120MVA) were 147MW and 90MW, respectively.

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147

90

13

13

39

Source: JICA Study Team based on network analysis data provided by EDM

Figure 2-2-2-1.3 Actual power flow recorded at 20:00 in July 2015

(4) Fault current

Figure 2-2-2-1.4 shows the fault current analysis result at 20:00 in July 2015 when the previous maximum demand was broken.

The fault current at 275 kV bus of Infulene Substation was 7.8kA which is much less than 31.5kA of circuit breaker rating. A double bus system adopted in Infulene Substation was usually operated separately, and the fault currents of each bus were 12.0kA and 14.3kA. In case the busses were operated in parallel, the current would become 18.6kA, much less than the circuit breaker rating, and there would be no problem.

In the whole southern network, the maximum values were as follows: 9.4kA in Maputo Substation for 275kV, 3.7kA in Infulene Substation for 110kV, and 15.9kA in Matola Substation for 66kV. All values were also much less than the circuit breaker ratings.

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Source: JICA Study Team based on network analysis data provided by EDM

Figure 2-2-2-1.4 Fault current analysis result at 20:00 in July 2015

(5) Stability

Grid Code does not define the fault clearing time for transmission line and EDM does not practice the stability analysis either. Referring below mentioned fault clearing time of 66kV transmission line, the fault clearing time as study condition for stability analysis is determined.

“Fault clearing time for EDM’s 66kV transmission line is as follows:

- Distance from bus to faulted point is smaller than 80% of line length : 0.1s

- Greater than 80% : 0.1-0.4s”

Since the faulted point is set on the point very near from the bus, 0.1s for 66kV line should be selected. However, EDM agreed that the severer condition shown below is selected.

After 3 phase fault occurs on a transmission line, the fault will be cleared and the faulted line will be opened at the time of 100 ms for 275kV line and 150 ms for 110 kV or 66 kV line. The control systems of generator such as exciter and governor provided by EDM are adopted.

The analysis cases are shown in Table 2-2-2-1.1, and all cases assumed that 3 phase short circuit fault occur nearby Infulene Substation, because this project is the replacement of T2 transformer at Infulene Substation.

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Table 2-2-2-1.1 Stability analysis cases

Voltage Faulted point Faulted transmission line Case No. 275kV Very near from Infulene 275kV bus Infulene – Matola 1 110kV Very near from Infulene 110kV bus Infulene – Xinavane 2

66kV Very near from Infulene 66kV bus

Infulene – Matole Gare 3 Infulene – Machava 4

Infulene – CTM 5 Infulene – SE6 6 Infulene – SE7 7 Infulene – SE8 8 Infulene – SE9 9

Source: JICA Study Team

Table 2-2-2-1.2 shows stability analysis results.

In the case 1 of 3 phase short circuit fault in 275kV Infulene-Matola line, since the voltage goes down to zero in 100ms until the circuit breaker operates to clear the fault, the network heavily fluctuates because the previous power of 105MW from Matola and 173MW from R. Garcia cannot be received. Even after the fault is cleared, the power through 275kV Infulene-Matola line cannot be still received because the line remains out of operation. But receiving the power from R. Garcia recovers since the voltage comes back to normal value after the fault is cleared. As a result, the fluctuation converges rapidly with time. It can be confirmed that the network can keep stability even if there is a severe fault condition at a point very close to 275kV bus.

For all other cases it is assumed that the fault occurs in the line at a point very close to 110kV or 66kV bus. Since the previous power flows before fault are not large and the fault occurs not in bulk power network but in local network, the impact of the fault is limited to local network level. Therefore, it can be said that the network is completely stable since the fluctuation is small.

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Table 2-2-2-1.2 Stability analysis results (Year 2015)

Case 1 Case 2 Case 3

Case 4 Case 5 Case 6

Case 7 Case 8 Case 9

Remark: Difference of phase compare to 400 kV busbar at Maputo Substation

: Beluluane : CTRG : Aggreko

Horizontal axis: 0～10s Virtical axis: -90～60°

Source: JICA Study Team based on network analysis data provided by EDM

Enlarged Case 1 Enlarged Case 3

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Future network (Year 2020)

The target year is set as 2020, when T2 transformer is planned to be replaced.

(1) Demand

The demand forecast indicated in Master Plan Update Project 2012-2027 does not match the actual demand recently recorded because of the economic standstill. Therefore, System Planning Directrate of EDM forecasted the demand in 2020 in the following way.

EDM divided Southern network into 5 areas (Maputo City, Maputo Province, L. South, Gen Southern and Industries), and EDM scrutinized demand characteristics of each area to set the demand growth rate.

The result of demand forecast is shown in Table 2-2-2-2.1. The forecasted peak demand in 2020 is 850MW which is 1.84 times of 463MW demand actually recorded in 2015, and the average growth rate in 5 years is 12.9%.

Table 2-2-2-2.1 Demand forecast by System Planning Directorate of EDM

Year 2015 (MW)

2020 (MW)

Growth rate (%)

Maputo City 219 370 11.1 Maputo Province 167 330 14.6

Industries 17 17 0.0 L. South 57 130 17.7

Gen Southern 2 4 14.9 Total 463 850 12.9

Remark: Industries stand for Mozal and Cimentos, L. South: North-East Region, Gen Southern: Northern hydro area Source: EDM

(2) Power development plan

According to System Planning Directrate of EDM, the power development plan for 387MW of the demand increase from 2015 to 2020 is as shown in Table 2-2-2-2.2. As this table shows, the power development plan (242.76 MW) does not meet the forecasted demand increase (387 MW), the difference of power development demand will be supplied from the power source outside the region.

Table 2-2-2-2.2 Power development plan of EDM from 2015 to 2020

Name Type No. of units Rated output per unit (MW) Total (MW) Aggreko Thermal 2 26.88 53.76

Kuvaninga Thermal 10 4.1 41 Electrotec Thermal 4 12 48

CTM Thermal 1 100 MW class 100

(approx.) Total 242.76

Source: EDM

(3) Network development plan

In response to the demand increase and the power development, System Planning Directrate of EDM has the network development plan shown in Figure 2-2-2-2.1.

Regarding the bulk power network, 275kV Beluluane Substation and 275kV Maputo-Beluluane line to supply power will be developed. As a reinforcement for the north part of network, 275kV Ressano Garcia-Dzimbene line and 275/110kV Dzimbene Substation will be developed. Regarding the local network, 110kV transmission lines will be extended to the north-east area, and Massinga Substation, Kuvaninga Substation and Mapai Substation will be also developed.

Regarding the 66kV network, the existing transmission lines from Infulene Substation with 38–

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50MW capacity will be rebuilt to increase the capacity to 120MVA and to remove the bottleneck problem. Moreover, two distribution substations will be developed, and CTM Thermal Power Plant with 100MW class as a power source located in high demand areas will be also developed. These plans are expected to significantly improve supply reliability.

CTM

SE2 SE3

SE1

P.Mozal

Cimentos

Matola Rio

Boane

Beluluane

Mozal

Matola

Machava

Matola Gare

SE8

SE5

SE7

SE6

SE9

MaputoAMSC

R. Garcia

Macia

Salamanga

Manhica

Xinavane

Lionde

Zimpeto

Chicumbane Lindela

SE11

EMSC

Corumana

KomatiportSouth Africa

SE4

Infulene

Marracuene

Dzimbene

Kuvaninga Mapai

100MW class

Lingamo

120MVA×2

Beluluane

SE　Facim

Massinga

250

MV

A4.

5km

120

MV

A

4.5

km 1

20M

VA

7.5k

m 1

20M

VA

1.4km120MVA

142km 479MVA

3.0k

m 1

20M

VA 1.4km

120MVA

1.8km120MVA

2.4km120MVA

46km99MVA

237km99MVA 100km

99MVA

250MVA

5.5km120MVA

0.6km479MVA

14km120MVA

Light:Existing

275kV AC132kV AC

110kV AC

66kV AC

Power Station

Substation

Legend

Dark:Planned

400kV AC

7.5km120MVA

5.4km120MVA

Source: JICA Study Team based on network analysis data provided by EDM

Figure 2-2-2-2.1 Network development plan (2015–2020)

(4) Power flow

Figure 2-2-2-2.2 shows the power flow in 2020.

Total power flow in eight 66kV feeders from Infulene Substation which was 207MW in 2015 will increase to 303MW in 2020 in a reflection of high demand growth, despite CTM Power Plant with 100MW output operation. Therefore, the power flows in T1 transformer (with a capacity of 250MVA) and T2 (250MVA) in Infulene Substation are 129MW and 103MW, respectively. In case of contingency of T1 transformer or T2 transformer with maximum capacity 250MVA, 158MW power flows in the transformer without breakdown after the busses operated separately are connected in parallel. This value is smaller than capacity (250MVA), and no overloading problem will occur.

Since the case of breakdown of one transformer is equivalent to the case without replacing T2 transformer (i.e., if this project replacing T2 transformer is not implemented), T3 transformer (120MVA) will be overloaded under contingency condition of T1 transformer. This shows the effectiveness of this project.

Furthermore, the areas supplied by 66 kV feeders from Infulene Substation extend to Maputo City and Maputo Province whose demand growth rates are 11.1% and 14.6% respectively. As the annual incremental demand in the above areas is expected to be 50MW at minimum, the utilization rate of T2 transformer is expected to increase year after year.

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Source: JICA Study Team based on network analysis data provided by EDM

Figure 2-2-2-2.2 Power flow in 2020

(5) Fault current

Figure 2-2-2-2.3 shows the fault current analysis result, and Table 2-2-2-2.3 shows a comparison between year 2015 and 2020.

The fault currents of 66kV busses at Infulene Substation in 2015 are 12.0kA and 14.3kA under condition of bus separate operation, and 18.6kA under condition of bus parallel operation. There is much allowance against 31.5kA of circuit breaker rating. The maximum values in each voltage system are 9.4kA for 275kV in Maputo Substation, 3.7kA for 110kV in Infulene Substation and 15.9kA for 66kV in Matola Substation. Each value is much smaller than circuit breaker rating.

Responding to the power development in line with the demand increase, the fault currents of all stations in 2020 will increase. The fault current of CTM Substation will double from 12.1kA in 2015 to 23.6kA in 2020, because of completion of CTM Power Plant in the adjoining site. The fault currents of 66kV busses in Infulene Substation are 21.8kA and 22.1kA under condition of bus separate operation, and 28.1kA under condition of bus parallel operation. Since the ratings of existing circuit breakers are 31.5kA at minimum, and 40kA will be adopted in this project, there will be no possibility for the fault currents to exceed the ratings in the future.

In the whole southern network, the maximum values are as follows: 10.2kA for 275kV in Beluluane Substation which will be newly developed, 5.6kA in Xinavane Substation for 110kV and 23.6kA in Matola Substation for 66kV. All values are also much less than the circuit breaker ratings.

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Source: JICA Study Team based on network analysis data provided by EDM

Figure 2-2-2-2.3 Fault current analysis result

Table 2-2-2-2.3 Fault current analysis result (comparison between 2015 and 2020)

Voltage (kV)

Station, Bus Fault current in 2015 (kA)

Fault current in 2020 (kA)

Remarks

400 Maputo 10.1 11.1 275 Matola 8.4 9.6

Infulene 7.8 9.2 110 Infulene 3.7 5.1 66 Infulene A 12.0 (18.6) 21.8 (28.1) (In case of Connecting

A and B Bus) Infulene B 14.3 (18.6) 22.1 (28.1) CTM 12.1 23.6 Matola 15.9 23.6 SE3 8.4 19.2 SE5 8.1 17.2 Beluluane 6.3 15.3 Boane 5.7 9.8

Source: JICA Study Team based on network analysis data provided by EDM

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(6) Stability

The condition for stability analysis is the same as that of 2015 and is shown in Table 2-2-2-2.4.

Table 2-2-2-2.4 Analysis cases (Year 2020)

Voltage Faulted point Faulted transmission line Case No. 275kV Very close to Infulene 275kV bus Infulene – Matola 1 110kV Very close to Infulene 110kV bus Infulene – Xinavane 2

66kV Very close to Infulene 66kV bus

Infulene – Matole Gare 3 Infulene – Machava 4

Infulene – CTM 5 Infulene – SE6 6 Infulene – SE7 7 Infulene – SE8 8 Infulene – SE9 9

Source: JICA Study Team

Table 2-2-2-2.5 shows stability analysis results.

Since the fault occurrence at a point very close to 66kV bus in Infulene Substation is assumed in all cases, the fluctuation of the generator in CTM Power Plant is salient. It is because CTM Power Plant is located at a short distance of 10km from Infulene Substation (light blue curve shows the fluctuation of CTM). However, the fluctuation converges with time in all cases, and it can be confirmed that the network in 2020 will be able to keep stability in case severe fault condition same as that of 2015 occurs.

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Table 2-2-2-2.5 Stability analysis results

Case 1 Case 2 Case 3

Case 4 Case 5 Case 6

Case 7 Case 8 Case 9

Remark: Difference of phase compare to 400 kV busbar at Maputo Substation

: CTM : Beluluane : CTRG : Aggreko

Horizontal axis: 0～10s Virtical axis: -90～60°

Source: JICA Study Team based on network analysis data provided by EDM

Enlarged Case 1 Enlarged Case 3

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Conclusion

The precise network analysis for power flow, fault current and stability proves that T2 transformer in Infulene Substation can be effectively operated without any problem in 2020 when it begins operation. Since the transmitting capacities of 66kV feeders from Infulene Substation are small (38–50MW), the bottleneck exists to supply power. However, rebuilding the transmission lines to the lines with capacity of 120MVA, replacing T2 transformer and completion of CTM Power Plant will be able to drastically improve the supply reliability to Maputo metropolitan area. Rebuilding 66kV feeders from Infulene Substation should be implemented in a way that maximize the effect of this project of replacing T2 transformer.

2-2-3 Basic Plan

Overall Plan

The design condition is as follow.

(1) Climate condition

Refer to Section 1-2-3, ‘Climate Conditions’.

(2) Design condition

Table 2-2-3-1.1 shows power system requirement.

Table 2-2-3-1.1 Power system of each voltage class

Item Voltage (kV) 275 66 33

Frequency 50Hz Phase 3

Maximum voltage 300 kV 72.5 kV 36 kV Lighting Impulse Withstand Voltage

1,050 kV 325 kV 170 kV

Commercial frequency withstand voltage

450 kV（1 min） 140 kV（1 min） 70 kV（1 min）

Creepage distance 31 mm/kV Earthing system Direct

(3) Applicable standard and units

International and Japanese standards such as International Electrotechnical Commission (IEC), Japanese Electrotechnical Committee (JEC) will be applied.

Basic Plan Overview

(1) Rehabilitation of Infulene Substation

Based on the following policy, the replacement of T2 transformer and switchgears will be carried out.

1) 275kV Circuit Breaker

Existing circuit breaker will be replaced due to its aging condition. Since it was manufactured in 1972 and has been operational for over 45 years, and it is difficult to obtain spare parts. Furthermore, faulty operations have been previously observed such as open-phase breaking.

2) 275/66/11kV Transformer

The transformer which has the same value as T1 transformer on (i) winding, (ii) transformer capacity, and (iii) percent impedance will be selected so that the T2 transformer will share the load evenly with T1 transformer during the parallel operation.

3) Station transformer

According to the design of existing low voltage system, station transformers of T1 and T2

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transformers will be used as ‘regular power receiver’ and ‘reserved power receiver’. Thus, the station transformer which has the same voltage class and capacity as T1 transformer will be selected.

4) 66kV circuit breaker, lighting arrester, line switch, voltage transformer and current transformer

Considering the fact that this equipment is aging and it is difficult to obtain its spare parts, it will be replaced by new equipment.

5) 275kV and 66kV overhead conductors of T2 transformer bay

Considering the operation and maintenance, conductors with the same specification as T1 transformer bay will be applied.

6) 66kV bus coupler (circuit breaker, line switch and overhead conductor)

The oil circuit breaker was manufactured in 1970s and the present condition (such as oil leakage) confirms its aging. Moreover, technicians at Infulene Substation appealed that circuit breaking problems previously occurred frequently. Therefore, the circuit breaker will be replaced to the new one. Considering the load current and maintenance, specification of the secondary side of T2 transformer will be applied.

7) Control and protection system of T2 transformer

A system with the same specification as the existing equipment will be selected to avoid wrong operation and maintenance of personnel.

The above equipment will be replaced by this project. However, the existing equipment, including 275kV line switches, voltage transformers, current transformers and lighting arrestors was manufactured in 1990s and it is still in a satisfactory operational condition. Also, specifications of this equipment are compatible with the new equipment. Thus, this equipment will continue serving in its present condition.

8) Copper pipe

Referring to the specification of the existing equipment, the size of the pipe will be 50/30Φ.

9) Earthing system

The installation method of the earthing system for T2 transformer shall be equivalent to the same system for the T1 transformer and its 66kV switchgears.

10) Procurement of maintenance tools

Regarding phase rotation meter and clump meter, EDM owns only one set of each of them to conduct the maintenance of the above 30 substations located in the southern region. Also, EDM apply one set of insulation oil analysis equipment and insulating oil purifier to all the substations throughout Mozambique.

Therefore, the Project shall procure the necessary maintenance tools including the above equipment to Infulene Substation, which is one of primary substations distributing the power to Maputo metropolitan area so as to secure the stable power supply through the proper operation and maintenance of the equipment procured by the Project.

EDM has an experience of utilization of insulating oil purifier as stated above. Removed oil during the utilization of this equipment shall be stored temporarily at oil store place on the substation.

(2) Procurement of mobile substation

Mobile substation is designed based on the following transportation condition and equipment condition.

1) Transportation condition

As a result of analysis of the transportation route from Maputo Seaport to Matola Gare

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Substation, where the site test will be carried out, it is confirmed that the capacity to climb-up 7.8% slope and travel through a minimum curb radius of 15 m and road width of 5 m are required. Appendices 7 shows the proposed transportation route. Also, according to the publication from National Road Administration (ANE), ‘Regulation on Weights, Dimensions, Combinations and Load Provisions in Motor Vehicles and Trailers (22 May 2008)’, the total weight of each vehicle should not be more than 56t. Hence, the requirement for the mobile substation for the project is shown in Table 2-2-3-2.1.

Mobile substation will be used at 66/33kV distributions located in the suburb of Maputo City. The maximum slope of the route to Manhica Substation (approx. 70 km away from Maputo City) is approx. 5.0%.

Table 2-2-3-2.1 Vehicle requirement

Item Requirement Passenger capacity More than 2

Handle position Left Engine output More than 520 PS

Maximum incline 7.8% (Pave road) Curb R=15 (Width: 5m)

Total weight Not more than 56t [Source] JICA Study Team

2) Equipment condition

As the mobile substation will be used at the suburb of Maputo City, the ratio will be 66/33kV and the capacity will be 20MVA. The mobile substation shall consist of switchgears at the primary and secondary sides, control and protection system and DC supply system.

Substation Equipment

Table 2-2-3-3.1 shows the basic plan of project components. Also, Table 2-2-3-3.2 shows the basic specification of the equipment.

Table 2-2-3-3.1 Basic plan

No. Equipment name Unit Quantity

(1) Rehabilitation of Infulene Substation 1-1 275kV Circuit Breaker (Porcelain clad type) Unit 1 1-2 275kV and 11kV Overhead Line and Terminals Lot 1 1-3 275/66/11kV Three-phase Autotransformer (250MVA) Unit 1

1-4 Station Transformer for T2 Transformer（250kVA） Unit 1 1-5 11kV Voltage Transformer and Through Type Current Transformer

for T2 Transformer Tertiary Side Lot 1

1-6 66kV Lightning Arrestor Unit 3 1-7 66kV Voltage Transformer Unit 3 1-8 66kVCurrent Transformer Unit 3 1-9 66kV Circuit Breaker Unit 2

1-10 66kV Disconnecting Switch Unit 4 1-11 Overhead Line and Terminals for T2 Transformer Secondary Side

and Bus Coupler Lot 1

1-12 Copper Pipe Lot 1 1-13 Equipment Pedestral Lot 1 1-14 Earthing System for T2 Transformer Secondary Side Lot 1 1-15 Control and Protection Panels for T2 Transformer Lot 1

(2) Procurement of Mobile Substation 2-1 66/33kV Mobile Substation (20 MVA) Lot 1

(3) Procurement of maintenance tools 3-1 Maintenance Tools Lot 1 3-2 Insulating Oil Analysis Equipment (moisture, gas, etc.) Lot 1 3-3 Insulation Oil Purifier Unit 1 3-4 Withstand Voltage Tester Lot 1 3-5 Protection Relay Tester Lot 1

[Source] JICA Study Team

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Table 2-2-3-3.2 Basic specification of the equipment

No. Equipment Specifications Quantity

(1) Rehabilitation of Infulene Substation

1-1 275kV Circuit Breaker （Porcelain clad type）

1 set

Standard Insulation method Rated voltage Rated current Rated frequency Rated short-time current Lightning impulse withstand voltage Power frequency withstand voltage

IEC62271 or equivalent SF６ 300kV 3150A 50Hz 31.5kA, 3sec. 1050kV 450kV

1-2 275kV and 11 kV Overhead Line and Terminals

1 lot

Standard Overhead Line

IEC61089 or equivalent Cu 150mm2 (Double-conductor) Al 325mm2 (Double-conductor)

1-3 275/66/11kV Three-phase Autotransformer (250MVA)

1 unit

Standard Type Rated capacity Rated voltage

Rated frequency Connection

Lightning impulse withstand voltage Power frequency withstand voltage On load tap changer Tap number

IEC60076 or equivalent Outdoor use, On-load tap changer Primary and Secondary: 250MVA, Tertiary: 40MVA Primary voltage: 275 kV, Secondary Voltage: 66 kV, Tertiary voltage: 11kV 50Hz Primary and Secondary side Star connection(Solidly grounding), Tertiary side: Delta connection (Non-grounding) Primary side: 1050kV or more, Secondary side: 350kV or more, Primary and Secondary side neutral point: 250kV or more, Tertiary: 95kV or more Primary side: 460 kV or more, Primary and Secondary side neutral point: 95kV or more, Secondary side: 140 kV or more Vacuum valve type 21 taps

1-4 Station Transformer for T2 Transformer (250kVA)

1 unit

Standard Type Voltage transformation ratio Rated capacity Vector group Rated frequency Power frequency withstand voltage Lightning impulse withstand voltage

IEC60076 or equivalent Outdoor use, Oil-immersed transformer 11/0.4kV 250kVA YNyn0d11 (Built-in stabilizing windings) 50Hz 38kV 1min 95kV

1-5 11kV Voltage Transformer and Through Type Current Transformer for T2 Transformer Tertiary Side

1 lot

Standard Type Power frequency withstand voltage Lightning impulse withstand voltage Voltage transformation ratio Current transformation ratio

IEC61869 or equivalent Outdoor use 38kV 1min 95kV 11000/√3 / 110/√3 /110/3 V 50/1A

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No. Equipment Specifications Quantity

1-6 66kV Lightning Arrestor 3 sets

Standard Type Rated voltage Discharge current Rated frequency Creepage distance

IEC60099 or equivalent Outdoor use, Silicone porcelain bushing 66 kV 10kA 50Hz 37.1mm/kV

1-7 66kV Voltage Transformer 3 sets

Standard Type Nominal Voltage Power frequency withstand voltage Lightning impulse withstand voltage Rated frequency Voltage transformation ratio Creepage distance

IEC61869 or equivalent Outdoor use 66kV 140kV 1min 325kV 50Hz 66000/√3 : 110/√3 - 110/3V 31mm/kV

1-8 66kV Current Transformer 3 sets

Standard Type Nominal Voltage Power frequency withstand voltage Lightning impulse withstand voltage Rated frequency Current transformation ratio Creepage distance

IEC61869 or equivalent Outdoor use 66kV 140kV 325kV 50Hz 2400-1600-600-400/1-1-1-1 A 31mm/kV

1-9 66kV Circuit Breaker 2 sets

Standard Type Insulation method Rated voltage Rated frequency Rated current Power frequency withstand voltage Lightning impulse withstand voltage Rated short-time current Creepage distance

IEC62271 or equivalent Outdoor use SF6 72.5kV 50Hz 3150A 140kV 1min 325kV 40kA 3sec 31mm/kV

1-10 66kV Disconnecting Switch 4 sets

Standard Type Rated voltage Rated frequency Rated current Power frequency withstand voltage Lightning impulse withstand voltage Rated short-time current Creepage distance

IEC62271 or equivalent Outdoor use 72.5kV 50Hz 3150A 140kV 325kV 31.5kA 3sec 31mm/kV

1-11 Overhead Line and Terminals for T2 Transformer Secondary Side and Bus Coupler

1 lot

Standard Aluminum electric wire

IEC61089 or equivalent BULL AAC2×865mm2

1-12 Copper Pipe 1 lot

Standard Voltage Size

IEC or equivalent 66 kV 50/30Φ

2-28

No. Equipment Specifications Quantity

1-13 Equipment Pedestal 1 lot

Standard Hot dip galvanizing

IEC or equivalent 76μm or more

1-14 Earthing System for T2 Transformer Secondary Side

1 lot

Materials

- Buried earthing wire

- Insulation coating earthing wire

- Connecting material

Annealed copper stranded wire (A) 100mm2 or equivalent Vinyl insulation wire (100mm2 IV) or equivalent C-type Compressed connector or bolt connector or equivalent

1-15 Control and Protection Panels for T2 Transformer

2 panels

Type Other

Indoor use, metal enclosed type To be composed by equipment and materials complying with

IEC standard or equivalent.

(2) Procurement of Mobile Substation

2-1 66/33 kV mobile substation (20 MVA) 1 lot

Common specification - Standard - Components

Transformer - Standards - Rated capacity - Rated voltage - Rated frequency - Number of phase - Impedance - On-load tap changer - Tap position - Tap range - Number of taps - Vector group - Electrical protection - Others

IEC or equivalent “2 trailers” or “1 trailer & 1 truck” To be composed by equipment and materials complying with IEC standard or equivalent. 20 MVA Primary: 66 kV, Secondary: 33 kV 50 Hz 3 Manufacture’s standard To be equipped Primary side +/- 10 %, 17 taps (1.25 %) 17 taps YNyn0(d) Ratio differential relay, ground relay, overcurrent relay Buchholz relay, Oil level gauges, Oil thermometers, name plate

(3) Procurement of maintenance tools

3-1 Maintenance Tools 1 lot

Insulation resistance tester Phase rotation meter Clamp meter Circuit tester

Range 500-1000-2500-5000V, 1 set Range 0-600V, 1 set Range 100mA-20A, 1 set Equivalent to Series 11 Multimeter manufactured by Fluke, 3 sets

3-2 Insulating Oil Analysis Equipment (moisture, gas, etc.)

1 set

Measurement

- Moisture - Carbon monoxide - Carbon dioxide - Methane - Acetylene - Ethane - Ethylene

0-100% 2-50,000ppm 20-50,000ppm 2-50,000ppm 0.5-50,000ppm 2-50,000ppm 2-50,000ppm

2-29

No. Equipment Specifications Quantity

3-3 Insulating Oil Purifier 1set

Standard Oil treatment capacity Moisture after the treatment Withstand voltage of the oil after the

treatment Tank capacity

IEC or equivalent 3,000 l/hr or more 10 PPM or less 60 kV/2.5mm or more 5,000 l

3-4 Withstand Voltage Tester 1 lot

Test voltage Power Device capacity

75kV Three-phase, 400 V, 50 Hz 70VA

3-5 Protection Relay Tester 1 lot

Rated frequency Setting range (Current)

Three phase Single phase Direct current

Resolution (Current) Setting range (Voltage)

Three phase Single phase Direct current

Resolution (Voltage)

50 Hz 3x0 64A 1x0 128A 1x0 ±180A 1mA 3x0 300V 1x0 600V 4x0 ±300V 5mV/10mV (150V/300V)

[Source] JICA Study Team

Foundation Construction

(1) Scale Calculation for Foundation of the Transformer

The civil and architectural standard in Mozambique is indicated in the General Urban Building Regulation (1960) enacted by Ministério das Obras Públicas e Habitação (MOPH). However, structural design and material standard are referred and regarded equally South African and old Portugal standards. During the project implementation period, EDM will submit detail design drawings to the Ministerio dos Recursos Minerais e Energia (MIREME) for the approval, after EDM receives these drawings from the Japanese supplier. It was agreed by MOPH and EDM that the foundation of the transformer design will be conducted to keep safety and functionally in line with the Japanese standards.

Soil investigation was executed for foundation of the T2 transformer by the Project. Detail design should be considered result of the soil investigation at the area of T2 Transformer that is mentioned 100kN/m2 allowable bearing capacity at actual ground level -1.0m, T2 transformer weight 2,800kN (280t) and civil engineering potential in Mozambique.

Foundation design condition showed in Table2-2-3-4.1.

Table 2-2-3-4.1 Foundation design condition

Item Content Detail Foundation Structure Reinforced Concrete Specified Concrete Strength (Fc):21N/mm2

Foundation Depth Bearing Stratum GL-1,250mm Allowable Bearing Capacity:100kN/m2 Foundation Area 7 x 11 = 77m2 T2 Transformer Weight:2,800kN

[Source] JICA Study Team

The oil pit shall be embedded in the transformer foundation as same as existing transformers, and it will be connected to the existing drainage system (oil-water separator) as well. Since Infulene Substation has an oil-water treatment system which enables to treat oil and water from existing 250 MVA transformer, the existing facility can sufficiently treat oil and water generated by the transformer installed by the Project. Thus, the capacity of this system will not be required to increase.

2-30

(2) Layout for Foundation of Transformer

T2 transformer layout has already decided to locate between T1 transformer and T3 transformer due to existing transformer to change new transformer. The foundation construction needs to consider the construction plan for working line, safety for carrying construction materials and vehicles into the site due to existing transformer and overhead wires are operating in the length of the Project.

2-2-4 Outline drawing

The outline drawings of this project is shown in Table 3-2-4.1.

Table 2-2-4.1 Outline design drawing list

Drawing No. Drawing title

Substation equipment

DWG No. E-1 Single Line Diagram of Infulene Substation

DWG No. E-2 Single Line Diagram of Mobile Substation

DWG No. E-3 Layout Plan of Infulene Substation（Scope of the Project）

DWG No. E-4 Side View of T2 Transformer and Primary Side Switchgear

DWG No. E-5 Side View of Secondary Side Switchgear of T2 Transformer

DWG No. E-6 Side View of Equipment for 66 kV Bus Coupler

DWG No. E-7 Layout Plan of Control & Relay Panels for T2 Transformer

Foundation Construction

DWG No. C-1 Demolitions and site preparation work of Secondary Side of T2 Transformer

DWG No. C-2 Demolitions and site preparation work of T2 Transformer

DWG No. C-3 T2 Transformer Foundation

The outline drawings of this project is shown in Table 3-2-4.1.

Y

Y

▽

x x

▽

Y

YY

▽

Y

YY

Y

Y

▽

Y

Y

▽

Y

Y

▽

YY

x x

Legend：Scope of the Project

：Equipment to be installed

DWG No.E-1 Single Line Diagram of Infulene Substation

2-31

YY

△

Digital Multi Meter

Digital Multi Meter

Digital Multi Meter

Same

as

left

DWG No.E-2　Single Line Diagram of Mobile Substation

2-32

OFFICES

POWERTRANSFORMER

VTCB CT LA

LA VT CT

CB

DS DS

DS DS CB

CB

CB

CB

CB

CB

HOUSE

LEGEND (凡例)T1 / Ｔ2 : Transformer (変圧器)LA : Lightning Arrester (避雷器)CT : Current Transformer (変流器)VT : Voltage Transformer (計器用変圧器)CB : Circuit Breaker (遮断器)DS : Disconnecting Switch (断路器)

DWG No.E-3　Layout Plan of Infulene Substation（Scope of the Project）

2-33

DWG No.E-4　Side View of T2 Transformer and Primary Side Switchgear

2-34

DWG No.E-5　Side View of Secondary Side Switchgear of T2 Transformer

2-35

DWG No.E-6　Side View of Equipment for 66 kV Bus Coupler

2-36

LV Panel DC PanelT2 transformerControl Panel

T2 transfomer Relay & 

Protection Panel

T1Relay & 

Protection Panel

T1Control Panel

CCUPanel

Entrance

LEGEND

: Cable trench

: Existing Panel

: Panels to be installed by the Project

DWG No.E-7　Layout Plan of Control & Relay Panels for T2 Transformer

2-37

MSA

MSA

MSA

MVT MCT

MVT MCT

MVT MCT

MCB

MCB

MCB

MG (EXISTENT) MG (EXISTENT)

MCI (EXISTING)

MG (EXISTENT) MG (EXISTENT)

MCI (EXISTING)

MCI (EXISTING)

MCI (EXISTING)

MCI (EXISTING)

MCI (EXISTING)

MIS1

MIS1

MIS2

MIS2

MAB

750

750

500500

500 500

750

750

1,650

900

1,100

1,650

900

1,500

1,500

1,500

1,500

6,000

EXISTING PANEL AXISNEW PANEL AXIS

2,580 1,950 970

2,510 2,020 5,500 1,500 1,500 2,025 1,975 2,025 1,975 1,500 1,50024,800

3,06012,500

CABLE TREN

CH (EX

ISTING)

TRANSFORMER BAY (EXISTING)

CABLE TREN

CH (EX

ISTING)

N1 (EXISTING)

TRANSFORMER AXIS

既設基礎（流用）Existing foundation to be maintained.

既設基礎（撤去及び新設）

Removal of existing foundation and construction of new foundation.

Legend

CABLE TRANCH

DWG No.C-1　Demolitions and site preparation work of Secondary Side of T2 Transformer

2-38

160

3,5802,565

RAIL AXIS

BAY AXIS

EXISTING STRUCTURES AXIS

EXISTING CABLE TRENCH DEPTH= 900

2,565

φ250 PVC DRAINAGE PIPE2.00%

EXISTING MANHOLE DEPTH 1800m

φ300 DRAINAGE PIPE

EXISTING CABLE TRENCH DEPTH= 900

NEW CABLE TRANCH DEPTH= 900

EXISTING MANHOLE

Foundation of the new T2 transformer

CONNNECTION  BETWEENDRAINAGE PIPE ANDMANHOLE MUST BESEALED WITHCONCRETE

EXISTING CABLE TRENCH TO MAINTAIN

EXISTING STEEL STRUCTURES AND FOUDATION TO DEMOLISH

EXISTING TRANSFORMER FOUNDATION TO DEMOLISH

DRAINAGE PIPE TO REMOVE

EXISTING FOUNDATIONTO DEMOLISH

LIMIT OF THE NEW AUXILIARYTRANSFORMER FOUNDATION

UNIT OF THE NEW TRANSFORMER FOUNDATION

EXISTING CABLE TRENCH TO PRESERVE

EXISTING SLAB TO PRESERVE

EXISTING RAILS TO PRESERVE

EXISTING RAILS TO REMOVE AND REAPPLY

EXISTING STEELSTRUCTURES TO DEMOLISH

EXISTING FOUNDATIONTO DEMOLISH

TRENCH CABLE WALLTO CLOSE WITH CONCRETE

EXISTING CABLE TRENCH TO DEMOLISH

DRAINAGE PIPE TO REMOVEOPENNING FOR NEW DRAINAGE PIPE

LIMIT OF THE NEW N1 FOUNDATION

RAILS SHALL BE CAREFULLY CUT AND REMOVEDAT TRANSFORMER FOUNDATION LIMIT.AFTERWARDS REAPPLIED ON NEW FOUNDATION

TRANCH WALL TO DEMOLISH

EXISTING CRUSHED STONETO REMOVE ABD REAPPLYIN THE NEW TRANSFORMER FOUNDATION

LIMIT OF THE NEW CABLE TRENCH

TRENCH WALL TO DEMOLISH

Foundation to be removed

LEGEND

DWG No.C-2　Demolitions and site preparation work of T2 Transformer

2-39

2,565 4,3354,000

200

6,840

200

200

200

150 200600200

1,250

450

210160

3,1155,0052,780

RAIL / TRANSFORMER

 AXIS

TRANSFORMER AXIS

BAY AXIS

450

250

200

200

200

200

‐350THK.= 100

‐350THK.= 100

TRANSFORMER AXIS

‐380THK.= 70

‐380THK.= 70

‐430THK.= 20‐450THK.= 0

‐160THK.= 0

‐330THK.= 120

‐370THK.= 80

‐400THK.= 50

‐330THK.= 120

‐370THK.= 80

‐330THK.= 120

‐370THK.= 80

‐400THK.= 50

HOLE φ150

HOLE φ150 HOLE φ150

HOLE φ150

0.5%

0.5%

0.5%

0.5%

200

6,440

200

HOLE φ200

SCREED FOR SLOPES

200 3,500 600 1,965 600 200 200

4,910

10,900

210160 5,620

3,1155,0052,780

RAIL / TRANSFORMER

 AXIS

TRANSFORMER AXIS

BAY AXIS

200

200

200

200

TRANSFORMER AXIS

200

200

4,000 2,565

4,910

2001,2502,585

1,150

5,290

HOLE φ150

HOLE φ150

HOLE φ150

HOLE φ150

RAIL LENGTH 5,200 (3) RAIL LENGTH 5,200 (3)

450

3,500

600 1,965 600 3,835

200

2,495 GAUGE (1)

6,440

TRANSFORMER TRACTION RING2 x φ25 a 400NL

3,420

3,420

6,840

4,335

φ200 CONCRETE PIPE FORCONNECTION TO AUXILIARY

TRANSFORMER

STEEL MESH 30x 30x 40 WITH 3mmPLATES, COVERED WITH A 3mmPLATE HOT DEEP GALVANIZED

(1) THE TRACK GAUGE SHOULD BE VERIFIED ON SITE, BEFORE THE CML WORK BEGINS;(2) THE LOCATION OF THE AXIS BAY SHOULD BE VERIFIED, BEFORE THE CONSTRUCTION OF THE NEW FOUNDATION;(3) THE DIMENSIONS OF THE RAILS SHOULD BE VERIFIED AT THE CONSTRUCTION SITE. IN CASE THE EXISTING RAILSECTION DIFFERS FROM THE SECTION DEFINED IN THE PROJECT, THE DESIGNER SHOULD BE NOTIFIED IMMEDIATELY.WHEN POSSIBLE THE REMOVED RAIL FROM EXISTING TRANSFORMER SHOULD BE REAPPLIED.

A A

B B

C

C

D

D

EE

A A

B B

C

D

D

EE

TRANSFORMER AXIS

RAIL / TRANSFORMER

 AXIS

TRANSFORMER AXIS

10,900

0.5% 0.5%-450▼

235

320

600

BAY AXIS

2,780 5,005 3,115

200 3,500 600 1,965 600 3,835 200

4,910 210 160 5,620

BLIND CONCRETE THK.= 50mm

+100▼

±0▼

RAIL / TRANSFORMER

 AXIS

TRANSFORMER AXIS

10,900

0.5% 0.5%-450▼

235

320

600

BAY AXIS

2,780 5,005 3,115

200 3,500 600 1,965 600 3,835 200

4,910 210 160 5,620

+100▼

±0▼

CRUSHED STONE (FROMEXISTING FOUNDATION)

0.5% HOLE φ150HOLE φ150▲-330

SECTION A ‐ A

SECTION B ‐ B

2001,630 3,170 1,390

450

600

450

100

1,1500.5% 0.5% 0.5% 0.5%

HOLE φ150 HOLE φ150SCREED TO FROM SLOPES

200 6,190 450

3,420 3,420

6,840

SECTION C ‐ C

±0▼

200 800250

200

6,440

450

3,635

5,620

10,900

CRUSHED STONE

BLIND CONCRETE THK.= 50mm

CRUSHED STONE

BLIND CONCRETE THK.= 50mm

CRUSHED STONE

50

150

50

150

50

150

DWG No.C-3　T2 Transformer Foundation

2-40

2-41

2-2-5 Implementation Plan

Implementation Policy

The Project will be implemented in line with Japan’s general Grant Aid scheme The implementation of the Project will be initiated after the Japanese government approves the implementation, followed by the conclusion of the Exchange of Notes (E/N) between the governments of Japan and Mozambique and the Grant Agreement (G/A) between JICA and Mozambique government. Basic implementation plan shall be as discussed in the following sections.

(1) Executing Agency

The executing agency of this project will be the Electricidade de Mozambique (EDM). The line ministry of the Executing Agency, which supervises the overall implementation of this project will be the Ministerio dos Recursos Minerais e Energia (MIREME).

Under the supervision of MIREME, EDM will make close communication with the Consultant and the Supplier of this project during the implementation for the smooth implementation of this project. EDM and MIREME have been collaboration closely and they have good relationship as the deputy mister of MIREME used to work as the CEO of EDM

Electrification and Project Directrate (EDM) will be in charge of executing this project. This directrate will be the direct counterpart of Japanese side and manage the project progress by carrying out the following tasks but not limited to: tax exemption procedure, tax refund, coordination with stakeholders of Mozambique side, and coordination with the Consultant and the Supplier at monthly meetings etc.

(2) Consultant

The consultant which conducted the preparatory survey will be recommended by JICA to be a supervisory consultant (hereinafter referred to as ‘the Consultant’) and conclude the agreement with EDM. The Consultant will conduct the detail design and the supervision of the work implementation. The Consultant will also prepare the tender documents and conduct the tender opening with the tender witness invited from EDM.

(3) Supplier

In accordance with Japan grant aid framework, independent Japanese contractors selected by open bidding (hereinafter referred to as ‘the Supplier’) will procure and install (including initial operation guidance and operational guidance) equipment including the mobile substation for the project.

The Supplier will need to continue supplying spare parts, support for failures, and other services after the project is completed, and as such must give due consideration to a post-delivery communication and coordination for equipment and facilities.

(4) Need for Dispatching Engineers

This project includes renovation work of the existing transformer and bay within Infulene substation. To minimize power outage, the construction will be planned to be conducted as the adjacent transformer bays will be kept to be live. Therefore, it is necessary to make arrangement among the Supplier, the client and the Consultant and give safety control priority. With the majority of the work being done concurrently, it is essential that foremen familiar with the Japanese grant aid system be dispatched from Japan to keep management and site guidance for the whole works consistent in terms of scheduling, quality, finished forms and safety management.

Additionally, mobile substation will be handed over to EDM after delivered to Matola Gare substation where inspection test run, initial operation guidance will be conducted. Engineers who can conduct the site test and technical guidance will be dispatched.

2-42

Implementation Conditions

(1) Mozambican Construction Conditions

Regarding installation work of substation equipment, there are general construction and electrical contractors in the Maputo areas which can accept orders for laborers, transportation vehicles and construction equipment within Mozambique, as well as civil engineering work for the project.

(2) Using Local Equipment and Materials

Cement and wood are produced locally, while rebar and others are imported from South Africa. Aggregate, cement, rebar and other materials for the foundation work can be procured locally, but they must be managed for quality and timely delivery. When construction plan regarding substation renovation is developed, materials which can be procured locally will be adopted as much as possible in consideration of project cost reduction and grant aid scheme.

However, as Mozambique relies on imports for the main substation facilities needed for the project, such equipment will be procured in Japan or third countries.

(3) Safety Measures

Mozambique has relatively few safety problems and since the project is located in an urban area it is easy to access and monitor it. Still, work after sunset is to be avoided, and sufficient care must be taken to prevent equipment theft and ensure the safety of construction staff. The temporary storage of materials and equipment for this project will be located within Infulene substation yard. As the storage is likely to be far from the control building, security guards will be staffed around the clock to protect against theft.

(4) Tax Exemption

Customs duties to be imposed on the equipment and materials which are to be procured in Japan or third countries for the Project are not refunded in accordance with certain procedures. On the other hand, VAT associated with the materials which are to be procured in Mozambique and payment to sub-contractor will be refunded. As the contractor will make a refund claim to EDM, EDM needs to formulate the necessary budgets before implementation of this project.

Scope of Works

The Japanese side will procure, install, test and adjust the 275/66 kV substation and switch gear for the project within the existing Infulene Substation and perform the necessary civil engineering work (foundation work, etc.). Regarding the Infulene Substation, Mozambican side will be responsible for the disconnection of main circuit and control circuit of the existing T2 transformer from the existing power system, connection of mobile substation and temporary dead-line work during the work for the target bay of the project (securing of safe construction environment).

The necessary work for the project completion will be conducted by the Japanese side as much as practicable. The connection equipment of the mobile substation will be procured from Japan as its accessories; however, on the other hand, the connection work will be conducted by EDM and the Japanese side will provide guidance considering that it is necessary for the mobile substation to be connected to the existing substations as a part of operations after handing over and EDM has already its mobile substations.

Detailed scopes of the works for the Japanese and Mozambican sides are as shown in Table 2-2-5-3.1.

2-43

Table 2-2-5-3.1 Work Demarcation for the Project

No. Item Work Demarcation

Remarks Japan Mozambique

1 The Project Implementation

(1) To secure a lot of land necessary for the installation of the equipment

〇 Infulene Substation

(2) Disconnection of the existing T2 transformer (66kV) from the existing power system

〇

(3) Removal of the T2 transformer from the site 〇

(4) Delivery of the mobile substation 〇 Matola Gare Substation

(5) Connection of the mobile substation 〇 Connection work is conducted by EDM, however connection materials and equipment is procured as accessories for the mobile substation by Japanese side.

(6) Implementation of adjustment and test run for the mobile substation 〇

Japanese side conducts adjustment and test run with installation work guidance.

2 Installation of the substation equipment

(1) Removal of the existing foundation 〇 The target equipment of the project

(2) The foundation for the substation equipment and the switchgear

〇

(3) The access road outside the site 〇 If necessary

3 To ensure prompt unloading and customs clearance of the products at ports of disembarkation in the recipient country and to assist internal transportation of the products

(1) Marine transportation of the products to Mozambique 〇

(2) Tax exemption and custom clearance of the Products at the port of disembarkation

〇

(3) VAT refund 〇

(4) Internal transportation from the port of disembarkation to the project site

〇

(5) Acquirement of road usage licensing related to internal transportation

〇 Acquirement of transport licensing of heavy items

4 To accord Japanese nationals whose services may be required in connection with the supply of the products and the services such facilities as may be necessary for their entry into the recipient country and stay therein for the performance of their work

〇

5 Assistance for work permit application for Japanese contractor and Japanese consultant

〇

6 To ensure that the products be maintained and used properly and effectively for the implementation of the Project

〇

7 To bear all the expenses, other than those covered by the Grant, necessary for the implementation of the Project

〇

8 To bear the following commissions paid to the Japanese bank for banking services based upon the B/A

(1) Advising commission of A/P 〇

(2) Payment commission 〇

9 Measures necessary to obtain the following permits: - Permits for installation work - Permits to access to restricted areas

〇 Acquired prior to the implementation of the project

10 Securing of site for temporary storage of materials and equipment

〇

2-44

No. Item Work Demarcation

Remarks Japan Mozambique

11 Securing of the gates and fences 〇 If necessary

12 Securing of parking during the work 〇

13 Securing of site for office for construction work 〇

14 Construction of office for construction work 〇 For the Supplier and the Consultant

15 Appropriate storage and safety control for materials and equipment at temporary storage

〇

16 Provision of places to dispose of waste materials, surplus soil and waste water

〇

17 Manufacturing and procurement of materials and equipment 〇

18 Installation, adjustment and tests of materials and equipment 〇

19 Dead-line work of the scope of the project 〇 Including removal of bus bar

20 Checking and securing of earthing resistance (1Ω or lower)of the existing earthing equipment

〇 Infulene Substation and the substation where the mobile substation is delivered

21 Securing of the installation space of the control and protection panels for T2 transformer in the existing T1 and T2 transformer room

〇

22 Provision of control power source for the procured equipment (T2 transformer bay/bays for panels and 66 kV bus coupler)

〇

23 Provision the power supply cables (AC/DC) of the procured equipment and connecting the control cables to the existing system

〇

24 Initial operation guidance and operational guidance for maintenance and management of procured equipment

〇

Notes: Items with sigh ○ indicate the country of parties responsible. Source: Prepared by JICA Study Team based on the data provided by EDM

Consultant Supervision

According to Japan's grant aid system, consultants are to form a project team consistent with the final design and construction supervision based on the spirit of the basic design and smoothly complete the work. This project requires installation of equipment in the substation in operation, and monitoring based on on-site coordination with EDM. As such, the consultant is to station at least one engineer on site to handle the overall schedule management, quality control, progress control and safety control during the construction supervision stage. Other engineers will also be dispatched to monitor the progress of the works including equipment installation, commissioning and adjustments, delivery testing and other works by the contractor. As necessary, a domestic expert is to witness factory inspections and pre-shipment inspections for equipment and the mobile substation manufactured domestically, and also supervise to prevent problems after unloading the equipment at the site.

(1) Basic Policy for Construction Management

As basic policy, consultants are to supervise the progress so that the work is completed within the given construction period. Along with ensuring on time delivery of the equipment with the quality and finished forms stipulated in the agreement, consultants will supervise and advise contractors so that they can perform the work safely at the site. The following are the main points to be kept in mind for construction supervision.

(2) Schedule Management

Consultant management staff will compare actual progress against the work schedule planned at time of contract monthly and weekly so that contractors will keep the delivery schedule given in the contract. If the work gets behind schedule, the staff will warn contractors and request them to submit and implement plans to get back on schedule, and guide contractors so that they can complete the work and deliver equipment within the contract construction period. The actual progress of the following items will be compared against the schedule:

2-45

Work progress including progress of site installation work including foundation construction Equipment and material transport to site including equipment and materials for substation, civil

engineering and construction Readiness of construction machinery Productivity and actual numbers of engineers, skilled workers, laborers and other workers

(3) Safety Control

Since the renovation work of Infulene substation will be conducted within the existing substation in operation, it is necessary to consider safety control under construction carefully, for example, securing enough elongation from live parts and implementation of outage work at night, etc. Consultant supervisory staff will consult and work together with the contractor's representative, and manage work safety to prevent any occupational accidents on the site during the construction period or accidents involving third parties. The following actions are to be taken in terms of site safety management:

Establish safety management regulation Decide a service route for transport machinery and other work vehicles within and outside

Infulene Substation, and ensure safe driving Prevent disasters through regular inspection of construction machinery Strictly insist workers take advantage of worker benefits and take leave

(4) Overall Relationships concerning Project Implementation

The concerned bodies of the project including their roles their relationship, including those during construction supervision, are as shown in Figure 2-2-5-4.1.

Note: *JICA’s verification is required for Consultant Agreement and Contract. Source: Preparatory Survey Team

Figure 2-2-5-4.1 Project Relation Diagram

(5) Construction Managers

The Supplier will procure and install substation equipment in the existing substation, as well as foundation construction as part of installation work. Furthermore, it will subcontract local Mozambican contractors to perform the work. Accordingly, the contractor is required to ensure subcontractors fully comply with the work schedule, quality, finished form and safety measures given in the work contract. To accomplish this, the Supplier will deploy engineers with experience in similar overseas work to guide and advise local contractors.

Given the scale and details of the substation facility for this project, the Supplier will preferably station

Government of Japan Government of Mozambique

Electricidate de Mozambique

Japanese consultant (The Consultant)

Preparation of final design drawings

Preparation of tender specifications

Operation of tender opening

Supervision

Japanese contractor (The Supplier)

Procurement / transportation of equipment

Installation and site test of equipment

Implementation of OJT Commissioning

Exchange of Notes (E/N)

JICA

Supervision

Consultant Agreement Approval of detailed design Approval of tender documents Verification of contracts (*) Monthly progress report

Contract

Grant Agreement (G/A)

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at least the number of engineers given in Table 2-2-5-4.1.

Table 2-2-5-4.1 Engineers to be dispatched by the Supplier

Title of personnel Number of engineers

Responsibilities Dispatch period

Local procurement supervisor

1

Supervision of all installation works, coordination with related agency, procurement management of equipment and materials, implement of customs clearance procedures

Throughout the construction and installation period

Inspector (Confirmation and verification of shop drawings for substation equipment)

1 Confirmation and verification of shop drawings for substation equipment, observation of equipment test, etc.

Drawing approval and equipment test period

Assistant for procurement supervisor (Local staff)

1 Adjustment of meeting for with counterpart Throughout the construction and installation period

Clerical worker (Local staff)

1 Paperwork, etc. Throughout the construction and installation period

Office boy (Local staff)

1 Miscellaneous duties Throughout the construction and installation period

Source: Prepared by JICA Study Team

Quality Control Plan

Consultant construction supervisory staff will supervise and verify that the Suppliers are maintaining quality, construction and installed forms of the equipment procured for the project are up to the quality and finished forms stipulated in the contract documents, including technical specifications and detailed design drawings. Staff will request contractors to correct, change or revise the work if quality or finished form is compromised.

The Consultant will carry out the following tasks:

1) Verify fabrication drawings and specifications of equipment

2) Witness factory inspections of equipment or verify inspections

3) Verify packaging, transportation and temporary placements on site

4) Verify working drawings and installation manual procedures for equipment

5) Verify equipment commissioning, adjustment, testing and inspection reports

6) Supervise site installation of equipment and witness commissioning, adjustments, tests and inspections

7) Verify equipment working drawings, fabrication drawings, and finished forms

8) Verify construction drawings, fabrication drawings, and on-site progress

Procurement Plan

As the main equipment and materials for the substation facilities to be procured and installed in the project are not manufactured in Mozambique, Japanese manufactured products will be basically adopted on the basis of the Japanese grant aid system. However, if the equipment is not distributed generally in Japan and it is reasonable to procure it from third countries, or if EDM’s operation and maintenance after handing over could be easy in consideration of the existing equipment, it is necessary to consider procuring from third country.

Given the above, the suppliers of equipment and materials of this project are as follows.

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(1) Locally Procured Equipment and Materials

Cement, concrete aggregate, rebar, wood and other temporary equipment and materials, etc.

(2) Equipment and Materials Procured in Japan

Transformer, station transformer, mobile transformer, copper pipe for bus bar and main circuit, maintenance tools, etc.

(3) Equipment and materials to be procured from third countries

275 kV circuit breaker, 11 kV current transformer and voltage transformer, 66 kVA switchgears, insulating pedestals, panels, insulating oil analysis equipment, protection relay tester, etc.

Operational Guidance Plan

As basic policy, a trainer from the manufacturer will give guidance on initial operation and O&M methods for the equipment procured and installed at Infulene Substation and the procured mobile substation before the work is complete in accordance with the O&M manuals. To keep this guidance plan progressing smoothly, EDM must appoint a full-time engineer to attend the guidance and keep close contact with Japanese consultants and contractors. Also, specialist manufacturer engineers of moderate skill level are needed for substation facility operations as well as adjustments and testing of transmission line equipment. Engineers must be sent from Japan to fulfill these roles and handle the quality control, technical guidance and schedule management.

Soft Component (Technical Assistance) Plan

As a result of observation of the O&M conditions of Infulene substation, EDM has sufficient technical level for the operation and maintenance of the substation equipment. As shown in Section 2-4-2, “Regular Inspection Policy”, EDM sets the maintenance and inspection structure by area, and operates and maintains its equipment. EDM has been operating the existing T2 transformer manufactured in 1971 for 47 years. Since this project is only updating the existing equipment, new O&M technology is not required. Therefore soft component is not involved because O&M system for the existing equipment has already established.

Implementation Schedule

Based on the Japan’s Grant Aid Scheme, the Project implementation schedule is given in Figure 2-2-5-9.1.

Remark: : Commissioning of Mobile Substation, : Commissioning of substation equipment Source: Preparatory Survey Team

Figure 2-2-5-9.1 Project Implementation schedule

Obligations of Recipient Country

The following items shall be conducted by the Mozambican side for the implementation of the Project. (Please also refer to Section 2-2-5-3, “Scope of Works’)

(1) General items

1) Provision of data necessary for the Project

2) Reporting and applying for any permit/document, if necessary, to stakeholders

3) Prompt custom clearance and tax exemption for equipment and materials of the Project at

Item

Preparation, approval and distribution of the tender documents 5.5 months

Tender opening

Conclusion of the Contract

Preparation and approval of shop drawings 22.5 months

Fablication of the substation equipment and mobile substation

Ocean transportation

Site work (Preparatory work, foundation work and installation work)

Test and adjustment Test and adjustment

Initial operation training Initial operation training

23

Detail design

13 14 15 16 17 187 8 9 10 11 121 2

Procurement

and

installation of

equipment

19 20 21 223 4 5 6Month

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Maputo Port.

4) Provision of tax exemption for equipment and materials (including the items procured in Mozambique) and provision of necessary supports to experts dispatched for the Project

5) Tax exemption of Japanese company (Corporate tax etc.)

6) To bear all the expenses other than those covered by the Grant necessary for the implementation of the Project

7) Proper use and maintenance of equipment and materials procured by the Project

(2) Preparatory work

1) Provision of land for project offices and temporary store yard

(3) Works conducted by the Mozambican side

1) Disconnecting the existing T2 transformer from the power system

2) Connecting the mobile substation and implementing preparatory work

3) Power stoppage of one 265kV busbar during the transportation of 275kV circuit breaker (if necessary)

4) Provision of safe work environment to Japanese side at the site of 66kV bus bar

Project Operation Plan

2-4-1 Basic Plan

Electrification and Projects Directorate will be responsible for the implementation of the Project and the manager and the director (deputy director) will be the direct counterpart of the Japanese side (the Supplier and the Consultant). The Mozambican side needs to formulate the budget for the Project implementation, which includes VAT refund and commission charge of the bank account for the Project in the fiscal year 2018. Figure 2-4-1.1 shows the project implementation structure.

Board Member

Consultant

Project Manager

Deputy Project Manager

EnvironmentAccountantLocal　Coordinator

SubstationFinance Procurement

Director/

Deputy DirectorSupplier

Figure 2-4-1.1 Project implementation structure

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2-4-2 Regular Inspection Policy

For the stable operation of substation facilities, preventive maintenance, which aims to find abnormal phenomena on equipment and makes necessary countermeasures in advance, is important. Monitoring and inspections are two major methods to check the operation condition of equipment.

The purpose of monitoring is to find abnormal operational conditions through observation etc. In general, monitoring is taken place once a day at substations where personnel are deployed. The purpose of inspection is to diagnose the condition of equipment and conduct the adjustment with tools and measurement tools and maintain the function by cleaning and replacement of consumables. Based on the frequency of conducting the inspection, there are two different types of inspections: ‘regular normal inspection’ and ‘regular fine (detail) inspection’.

During the periodical normal inspection, facilities are diagnosed and cleaned after the stoppage of the operation. The frequency is usually once per 1to 3 years. On the other hand, a periodical fine inspection is also conducted after suspending the operation by dismantling the facilities and diagnose the internal conditions in detail. This type of inspection is carried out once per 5 to 10 years. The result of these inspections should be shared among relevant personnel and recorded for the inspection next time.

EDM sets the maintenance and inspection structure by area. Maintenance and inspection group is organized in Infulene Substation and it manages substations in the southern transmission system. The head of the group is the station manager of Infulene Substation, and the group consists of five sub-groups: (i) operation group, which is responsible for the operation of equipment, (ii) equipment group, which maintain power equipment such as power transformer, (iii) protection group, which maintain protection relay and control circuit, (iv) transmission line group, which maintain the transmission line and (v) communication group, which is responsible for the remote control. Monitoring is conducted by operation group once a day at Infulene Substation. If the abnormal condition is found at an equipment, the result is reported to the group which is responsible for this equipment. The reported group will make necessary countermeasures and report the result to the station manager.

Based on the previous inspection result, the inspection plan is formulated and the results are recorded. Especially, as for power transformers, the diagnosis of moisture in insulation oils and gas analysis of all the transformers in the southern transmission system is conducted every year and the result is properly recorded.

Although EDM currently carries out the inspection and maintenance of substation equipment properly in the southern transmission system, EDM still faces difficulty in stopping its operation when there are substations which have only one bank of power transformer, due to the necessity of continuous power supply. Thus, the environment to conduct the inspection steadily has to be realized through the utilization of mobile substations.

2-4-3 Spare Parts Procurement Plan

According to the JICA Grant Aid Scheme, the implementing agency has to be capable of the operation and maintenance of the equipment procured under the Project. Through the preparatory survey, it is confirmed that EDM has enough capability. These spare parts to be procured under the Project are assumed to be used within 1 year after the commissioning. In addition, considering the importance of T2 transformer, the stoppage of its operation by any faults of switchgears has to be avoided. From this view, the procurement of additional spare parts are also put into consideration. As for spare parts other than those mentioned above, EDM will procure as a part of operation and maintenance works.

(1) 275/66/11kV Three-phase Autotransformer

Table 2-4-3.1 shows a list of spare parts for 275/66/11kV three-phase autotransformer. The items were selected considering the case of emergency. Since the application of pressure relief valve depends on the design of the transformer, this part shall be procured as spare parts if utilized.

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Table 2-4-3.1 Spare parts list for 275/66/11kV Three-phase Autotransformer No. Item Quantity (1) 275 kV bushing 1 (2) 66 kV bushing 1 (3) 11 kV bushing 1 (4) Buchholz relay 1 (5) Oil temperature gauge 1 (6) Oil level gauge 1 (7) MCCB (each type) 1 (8) Auxiliary relay (each) 1 (9) Fuse (each type) 100%

(10) Lamp (each type) 100% (11) LED lamp with socket (each type) 10% (12) Packing (each type) 100% (13) Pressure relief valve (if applicable) 1

Source: Prepared by JICA Study Team

(2) 66kV Lightning Arrester

Table 2-4-3.2 shows the spare parts of the 66kV lightning arrester. The Project site undergoes 70 lightning days per year. The spare parts of lightning arrester will be procured to avoid the stoppage of the T2 transformer operation in case of its fault.

Table 2-4-3.2 List of spare parts for 66kV lightning arrester No. Item Quantity (1) Lightning arrester part 1 unit

Source: Prepared by JICA Study Team

(3) 66kV Current Transformer

Table 2-4-3.3 shows the spare parts for 66kV current transformer. The current transformer shall be used for the bay of T2 transformer. In case the current transformer is faulty, the stoppage of T2 transformer has to be avoided. To make the power supply more stable, one unit of the current transformer will be procured as a spare part.

Table 2-4-3.3 List of spare parts for 66kV current transformer No. Item Quantity (1) Current transformer 1 unit

Source: Prepared by JICA Study Team

(4) 66kV Circuit Breaker

Table 2-4-3.4 shows a list of spare parts for 66kV circuit breaker. In addition to the motor circuit fuses, one unit of circuit breaker pole will be procured so as to avoid the suspension of the operation of T2 transformer due to the faulty condition of this equipment.

Table 2-4-3.4 List of spare parts for 66kV circuit breaker No. Item Quantity (1) Motor circuit fuse 100% (2) Circuit Breaker pole 1 unit

Source: Prepared by JICA Study Team

(5) 66kV Disconnecting Switch

Table 2-4-3.5 shows a list of spare parts for 66kV disconnecting switch. Motor circuit fuses and disconnecting switch blade will be procured.

Table 2-4-3.5 List of spare parts for 66kV disconnecting switch No. Item Quantity (1) Motor circuit fuse 100% (2) Disconnecting switch blade 1 unit

Source: Prepared by JICA Study Team

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(6) Protection and Control & Relay Panels for T2 Transformer

Table 2-4-3.6 shows the spare parts for this equipment. One unit of differential relay shall be procured.

Table 2-4-3.6 List of spare parts for protection and control & relay panels for T2 transformer No. Item Quantity (1) Differential relay 1 unit

Source: Prepared by JICA Study Team

Project Cost Estimation

2-5-1 Initial Cost Estimation

(1) Condition of the estimation

The condition of the cost estimation for the project costs is shown in Table 2-5.1.

Table 2-5.1 Condition of the cost estimation

Item Contents

Time of cost estimation December, 2016

Exchange rate 1USD = 105.63 Japanese yen

1MZN=1.379 Japanese yen

Source: Prepared by JICA Study Team

(2) Costs borne by Mozambique

Costs borne by the Mozambican side is estimated to be 54 thousand USD. The breakdown is shown in Table 2-5.2.

Table 2-5.2 Breakdown of costs borne by the Mozambican side Item Amount (approx.)

VAT refund 40 thousand USD (Three million MZN) Bank commission charge 14 thousand USD (One million MZN)

Total 54 thousand USD (Four million MZN)

Source: Prepared by JICA Study Team

2-5-2 Operation and Maintenance Cost

After the commencement of service, Transmission Network Directrate of EDM shall be responsible for the operation and maintenance of the equipment procured and installed by the Project. As Infulene Substation is the existing substation and has already been properly operated and maintained by EDM, no additional operation cost is to be generated.

EDM has to formulate the budget to store the spare parts stated in Section 2-4-3 “Spare Parts Procurement Plan” for the sound operation and making prompt countermeasures when trouble happens. Assuming the spare parts will be purchased every fifteen years, statutory useful life of major power equipment, the budget to be formulated every year will be approximately 900 thousand MZN. This amount account for merely 0.01% of the operation expenses in 2015. Therefore, the costs necessary for the operation and maintenance can be covered by EDM sufficiently.

CHAPTER 3 PROJECT EVALUATION

3-1

Project Evaluation 3-1 Preconditions

The preconditions of the implementation of this project is to secure spaces where the substation equipment will be installed and where the mobile substation will be connected. As this project is the replacement and reinforcement of existing main transformer at Infulene Substation, which is managed by EDM, it has been confirmed that social and environmental impact investigation and approval are not necessary. Based on these preconditions, the followings are the requirement for the EDM prior to the implementation of the project:

(1) Banking Charge

EDM has to bear the banking charge for the payment to the contractor and consultant, and prepare the budget for this end in advance.

(2) Tax exemption

EDM is required to allocate its budget within 2017 to this project for refunding VAT and other fiscal levies. During the second field survey, it has been confirmed that EDM will bear the amount for refunding VAT and other fiscal levies by utilizing their own financial resources, regardless of 60 % VAT exemption for services.

3-2 Necessary Inputs by Recipient Country

The followings are the inputs expected from the Mozambican side to achieve the overall plan of the Project.

(1) Before Commencement of Construction

1) Removal of cables and parts of the existing T2 transformer from the system for the removal

Existing T2 transformer will be dismantled by the Japanese side. However, EDM engineers and technicians have to disconnect and remove the cables and equipment connected with the transformer before dismantling the transformer. As it is necessary to dis-energize the equipment connected with the transformer to remove the cables and parts, EDM engineers and technicians who are familiar with the facility have to handle the removal work.

2) To secure a space to install control and relay panels in T1/T2 transformer house

Space to install the control and relay panels of the new T2 transformer are necessary and have to be secured in T1/T2 transformer house.

3) To secure the land and connection point of the mobile substation

To conduct the adjustment and site tests of the mobile substation, EDM is required to secure the connection point of the mobile substation (66 kV side).

4) To secure a land space to construct project office and store materials within Infulene Substation

EDM is required to secure land spaces within Infulene Substation to construct temporary office and store project materials.

(2) During the Construction Period

1) Input of human resources for the supervision of the project implementation

The Electrification and Project Directorate of EDM shall be responsible for the Project implementation. EDM is required to input the necessary personnel as the Project implementation structure of Figure 2-4-1.1 of Chapter 2 indicates.

2) Connection of the mobile substation to the connection point at the substation

After the procurement of the mobile substation, EDM shall connect the mobile substation

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to the connection point at the substation under the supervision of Japanese supervisor.

3) Power outage of 275 kV busbar during the transportation of 275 kV circuit breaker

To secure the safe work environment of the Japanese side, particularly during the transportation of 275 kV circuit breaker in the switchyard, EDM shall temporarily stop the power of one 275 kV busbar through the arrangement to be made among EDM, the Supplier, and the Consultant.

4) Power outage of 66 kV busbar and 66 kV bays during the installation work

The Project shall conduct the work at the secondary side of T2 transformer and bus-coupling bay. EDM is required to stop power and remove the aluminum pipes of these bays during the installation work of the Japanese side (during the breaking of the existing foundation, installation of disconnecting switches, and installation of the overhead conductors) and reconnect the aluminum pipe after making adjustment with work of Japanese side.

(3) After the completion of the Project

1) Input for the operation and maintenance

As the Project is the replacement of existing T2 transformer, there would be no additional inputs for maintenance. However, it has to be ensured that the budget and human resource that had been assigned for maintaining existing T2 transformer has to be maintained for new T2 transformer.

2) Keeping the maintenance tools at Infulene Substation

EDM understands that the maintenance tools procured by the Project shall be used only for the facilities procured by the Project. Therefore, EDM shall make sure that these items are stored in Infulene Substation appropriately and not used at different stations.

3) Keeping the spare parts at Infulene Substation

EDM also understands that these spare parts procured by the Project shall be used exclusively for these equipment installed by the Project. Therefore, EDM shall make sure to store these spare parts at Infulene Substation.

3-3 Important Assumptions

The external conditions to generate and maintain impacts of the Project are as follows:

(1) For the Overall Goal There should be no change in power development policies. There should be political and economic stability.

(2) For the Project Purposes Security of Infulene Substation, where substation equipment will be installed, should be

ensured. Security of Matola Gare Substation, where mobile substation will be connected, should be

ensured.

(3) For Expected Outputs Subordinate distribution facilities should be fully utilized. The operation and maintenance management plan for the facilities should be carried out.

3-4 Project Evaluation

3.4.1 Relevance

As shown below, relevance for this Project is considered to be high as it helps to achieve Mozambican socioeconomic development policy as well as Japan’s official development assistance (ODA) policy.

3-3

(1) Urgency and Relevance of Facility Capacity

Power will be developed mainly as follows: 1) Capacity to supply power demand will be maintained 2) Supply reliability (reducing power downtime, etc.) will be improved by ensuring reserve

supply capacity 3) Power quality will be improved by improving power system structure, etc.

Of the above points, the first is the most urgent as it is an underlying factor in supplying stable power.

Maputo metropolitan area is a large power consumption area and 66 kV transmission network has been developed. 66/11 kV distribution substations are arranged at Maputo City and 66/33 distribution substations are mainly used in Maputo surrounding area. Since the power demand is developing remarkably, the shortage of power supply is forecasted. Therefore, EDM has been upgrading the transmission capacity to increase the power supply capacity. Infulene Substation plays an important role as a 275/66 kV substation supplying power to Maputo metropolitan area.

The power system is interconnected from the power generation to the end consumers through transmission, substation and distribution, and the power generation and consumption are always linked under the coherent power system. Infulene Substation is positioned at the center of the upstream and downstream of the power system and its necessity is significant. Therefore, the upgrading of Infulene Substation is indispensable for the stable power supply.

The existing 66/11 kV distribution substations located at the center of Maputo metropolitan area are planned to be upgraded by the World Bank and others. However, since 66/33 kV distribution substations are highly expected to remain as they are at present the overloading and unstable power supplies remains a large concern. Therefore, the use of mobile substation to avoid the overloading and continue the stable power supply is highly necessary.

(2) Benefit

Maputo metropolitan area is comprised of Maputo City, the center of business and services, and Maputo suburb area and its extended areas, which is the center of industrial area. The ring road goes around the metropolitan area. The supply area Infulene Substation covers overlaps with this Maputo metropolitan area.

If we look at the power supply capacity of Infulene Substation by transformers of T1 to T3 to Maputo metropolitan area, the aggregated capacity utilization rate is 68.8% when the system peak took place in 20151. From the view of stable power supply, the upgrading of equipment is urgent issue. T2 transformer to be installed by the Project shall contribute to 40.3% of the power supply capacity to Maputo metropolitan area.

(Capacity of T2 transformer: 250 MVA) / (Capacity of T2 transformer: 250 MVA + Existing capacity: 370 MVA) = 40.3%

As various public services and utilities including medical and educational facilities, and governmental organizations are located in Maputo metropolitan area, this Project will contribute to sustain the socioeconomic activities by stable power supply.

(3) Operation and maintenance capacity

Despite its struggles with large-scale capital investments such as the current cooperation project, EDM does have a certain level of technical capacity in system operations and has steadily handled operation and maintenance (O&M) for the national power transmission network.

This project shall install 275/66/11 kV transformer (T2 transformer) at Infulene Substation and EDM has been operating a transformer whose specification is the same as that of T2 transformer. Also, EDM has been operating 6 mobile substations, including 20 MVA mobile substation which

1 Aggregate capacity utilization rate of T1 transformer to T3 transformer during the peak period recorded in 2015 (July 20

hours).

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has the same capacity as the substation to be procured by the project. The mobile substation to be procured by the project shall be a compact type and different from all-in-one trailer type which EDM owns; the operation and maintenance skills required shall not beyond the experience level EDM has been undergoing.

As such, manufacturer technicians will be used for O&M technology transfers, offering guidance on initial and standard operation based on the characteristics, features and specifications of the equipment. Assuming that the technology transfer on different operation methods from each delivering manufacturer goes smoothly, there should be no issues in terms of O&M of delivered equipment by EDM.

(4) Collaboration with other donors

This project shall realize the improvement of the stability of power supply to Maputo metropolitan area by the expansion of supply capacity. This means, the development and expansion of the downstream transmission lines such as 66 kV shall greatly contribute to the efficient implementation of the power supply by EDM. Since the World Bank is going to implement a project for expansion of 66 kV transmission lines from Infulene Substation, coordinating and collaborating with other donors on this project is important.

(5) Conformity with Mozambican government policy of social and economic development

Mozambican Government published “National Development Plan (Estrategia Nacional de Desenvolvimento) 2015–2035” in 2014, which stipulates the government policy to continue the previous strategy of economic development through large scale investments for exploitation industry including natural gas, and other industries such as agriculture, fishery, manufacturing and tourism. Following the strategy of industrial development of these sectors, the government intends to reform the economic structure and create job opportunities.

Maputo metropolitan area, the target area of this project, is important to support this strategy of macroeconomic growth. This project will be implemented for securing power supply reliability, which is necessary to develop and encourage socio-economic activities in the metropolitan area. So this project is in good conformity with the government policy.

(6) Conformity with Japanese government policy of development cooperation for Mozambique

Japanese policy to support Mozambique encompasses the development of economic infrastructure and human resource. This project primarily contributes to the development of economic infrastructure, and also human resource by improving electricity supply to social facilities such as schools, vocational training centers and hospitals. So this project is in good conformity with Japanese policy to support Mozambique.

3.4.2 Effectiveness

The impacts expected from the implementation of the Project are as follows:

(1) Quantitative impacts

Outcome indicator Actual value

in 2015 (Base value)

Target value in 2020

(Completion year)

Target value in 2023

(Three years after the completion)

Total capacity of T1 transformer to T3 transformer (275/66 kV)

436 MVA 620 MVA 620 MVA

Aggregate capacity utilization rate of T1 transformer to T3 transformer (Power flow when the system peak took place)

68.8%

(296 MVA)

52.2%

(324 MVA)

75.1%

(466 MVA)

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The aggregate capacity utilization rate of T1 transformer to T3 transformer shown above was calculated using the power flow data during the system peak period2. The actual capacity utilization rate in 2015, 68.8%, reduces to 52.2% in 2020, which is caused by the increased transformer capacity of T2 from 66 MVA to 250 MVA by this project. The target value in 2023 is 75.1%; however, the value is the anticipated value when power demand increases as was forecasted, and maintenance of the substation is conducted appropriately. The actual capacity utilization rate in 2023 will be calculated based on the actual power flow data that will be recorded during the system peak period in 2023. So this value in 2023 will be more or less than 75.1%, depending on the actual power flow data. This means that the target value that will actually be attained in 2023 should not be necessarily more than 75.1%. So the target value of 75.1% in 2023 has to be treated with the caveat that this value has been estimated according to the assumptions made during the present investigation.

The target values in 2020 and 2023 have been calculated as follows:

i) The Target Value in 2020 Forecasted Power Flow (Power Demand) in 20203 = 291 MW Convert the forecasted power flow above in MW to MVA assuming a power factor 0.9 291 MW / 0.9 = 324 MVA Capacity Utilization Rate in 2020 = 324 MVA / 620 MVA = 52.2%

ii) The Target Value in 2023 Forecasted Power Flow (Power Demand) in 20234 = 419 MW Convert the forecasted power flow above in MW to MVA assuming a power factor 0.9 419 MW / 0.9 = 466 MVA Capacity Utilization Rate in 2023 = 466 MVA / 620 MVA = 75.1%.

(2) Qualitative impacts (Project)

Present status and problems Project countermeasures

(Grant aid project) Extent of project effects and

improvement

It was found out that T1 transformer had been loaded more than its capacity of 250 MVA during the peak hours of 4 months in 2015. At the same time, the load of T2 transformer (66 MVA) is limited to 50% due to its aging condition. Therefore, in case the T1 transformer becomes faulty, the overall operation of Infulene Substation may stop and it can influence other substations in Maputo metropolitan area. Power

Existing 66 MVA T2 transformer will be replaced to 250 MVA transformer so that in total two units of 250 MVA transformers will be installed at Infulene Substation. It will continue the supply power even during the fault on T1 transformer.

According to the power flow forecasts in 2020, when the project will be completed, the loads of T1 transformer and T2 transformer (250 MVA each) will be 129 MW and 103 MW respectively. Therefore, even one of them becomes faulty, the other can continue the power supply (N-1 criteria), leading to the improvement of power supply stability in Maputo metropolitan area. Further, these transformers will be able to meet power demand increase until and

2 The actual capacity utilization rate in 2015 was calculated using the power flow data shown in Figure 2-2-2-1.3, the target

capacity utilization rate in 2020 using the power flow data in Figure 2-2-2-2.2, and the target capacity utilization rate in 2023 using the power flow data in 2023 that was estimated by increasing the power flow in 2020 by the annual increase rate of 12.9% used for the demand forecast in Table 2-2-2-2.1.

3 Total load of T1 transformer (129MVA), T2 transformer (103MVA) and T3 transformer (59MVA) as of 2020 (Refer to Figure 2-2-2-2.2).

4 The forecasted power flow in 2023 has been calculated by increasing the forecasted power flow in 2020, 291 MW, by 12.9 % for 3 years. The rate of 12.9% is the annual increase rate used for demand forecast in 2020 (refer to Table 2-2-2-2.1).

3-6

Present status and problems Project countermeasures

(Grant aid project) Extent of project effects and

improvement

supply to Maputo metropolitan area is quite vulnerable and urgent countermeasures are required.

beyond 2023.

Oil circuit breaker of 66 kV double busbar at Infulene Substation used as a bus-coupler is deteriorating because it is aging. The circuit breaker indicates faulty performance such as breaking circuit with a lack of phases. Furthermore, the oil leakage is considered to have negative impacts on the environment.

Replacement of the existing oil circuit breaker to a reliable SF6 circuit breaker.

Due to the recovery of operation reliability of bus coupler, EDM can operate an uninterrupted 66 kV outgoing feeders switching. When the power demand increases in the future, the necessity of feeder switches will be more important, and the replacement of the circuit breaker is necessary.

Demand forecast indicates that the power demand at distribution substations situated in Maputo surrounding area will exceed the substation capacity, and it will not be possible to stop transformer operation for inspection and maintenance.

66/33 kV mobile substation will be procured.

One fundamental solution to realize the stable power supply is to increase the installed capacity of respective substations. However, the expansion of substation capacity sometimes requires time and may not be conducted in a timely manner. Assuming the substation capacity will remain the same until 2020, overloading will be observed at some distribution substations, and there will be several distribution substations where they will not be able to stop transformer operation for inspection and maintenance. Through the utilization of mobile substation on the spot, the power supply will be continuously carried out, and they will be able to stop transformer operation for inspection and maintenance.

APPENDICES

A-1 Member List of the Study Team ······························································ A-1-1

A-2 Study Schedule ·················································································· A-2-1

A-3 List of Parties Concerned in the Recipient Country ······································· A-3-1

A-4 Minutes of Discussions ········································································ A-4-1

A-5 Field Report ····················································································· A-5-1

A-6 Topographic & Geotechnical Survey Report ················································· A-6-1

A-7 Transportation Route of Mobile Substation to Infulene Substation ························ A-7-1

A-1 Member List of the Study Team

1. Member List of the Study Team

(1) First Field Survey

Name Assignment Organization

Shigeru SUGIYAMA Team Leader Japan International Corporation Agency

Masashi YAMAMOTO Planning Management Japan International Corporation Agency

Toshiyuki HAYASHI Chief Consultant /

Power Development Planning Global Human Development Japan

Kazuaki KONDO

Deputy Chief Consultant /

Power Development Planning /

Procurement Planning / Cost Estimation

Yachiyo Engineering Co., Ltd.

Shizuo ITO Substation Planning Yachiyo Engineering Co., Ltd.

Teruo KURUMADA Facility Planning /

Foundation Designing Yachiyo Engineering Co., Ltd.

Koji ODA Natural Condition / Cost Estimation Yachiyo Engineering Co., Ltd.

Nobuyuki KINOSHITA Power System Analysis Yachiyo Engineering Co., Ltd.

Naoya KISHI Coordinator/

Assistant for Power Development Planning Yachiyo Engineering Co., Ltd.

(2) Second Field Survey

Name Assignment Organization

Hiroyuki KOBAYASHI Team Leader Japan International Corporation Agency

Tsunenari SOYAMA Planning Management Japan International Corporation Agency

Toshiyuki HAYASHI Chief Consultant /

Power Development Planning Global Human Development Japan

Kazuaki KONDO

Deputy Chief Consultant /

Power Development Planning /

Procurement Planning / Cost Estimation

Yachiyo Engineering Co., Ltd.

Yoshio AKASHI Substation Planning Yachiyo Engineering Co., Ltd.

Nobuyuki KINOSHITA Power System Analysis Yachiyo Engineering Co., Ltd.

Naoya KISHI Coordinator/

Assistant for Power Development Planning Yachiyo Engineering Co., Ltd.

A-1-1

A-2 Study Schedule

2. Study Schedule (1) First Field Survey

No. Date (Day)

Contents Place to stay

JICA Consultant Sugiyama and

Yamamoto Hayashi, Kondo, Ito, Kinoshita and Kishi Kurumada

and Oda

1 Nov. 20th

(Sun)

① Trip{Narita–Hong Kong} On

board

2 Nov. 21st

(Mon)

1) Trip{Hong Kong–Johannesburg–Maputo}

2) Internal meeting

Maputo

3 Nov. 22nd

(Tue)

1) Meeting and explanation of the survey (JICA Mozambique Office) [08:30]

2) Courtesy call and explanation of the survey(Electricidate de Mozambique (EDM: Requested components, scope, JICA Grant scheme, confirmation of the counterpart, explanation of the questionnaire)) [17:00]

Maputo

4 Nov. 23rd

(Wed)

1) Site survey of the existing substations (Infulene Substation etc.: Single line diagram, Specification of equipment and operation record)[8:45]

2) Technical discussion (EDM: Collection of the Grid Code, PSSE data etc.)[14:30]

Maputo

5 Nov. 24th

(Thu)

1) Site survey of the existing substations (Infulene Substation: Single line diagram, Specification of equipment and operation record)[9:00]

2) Technical discussion (EDM: Tender documents, substation drawings etc.)[8:30]Power

Maputo

6 Nov. 25th (Fri)

1) Site survey of the existing substations (Infulene Substation: Single line diagram, Specification of equipment and operation record) [9:00]

2) Checking the office room[11:00] 3) Internal meeting (Outline of the

components)[16:00] 4) Network analysis (Power flow

calculation)Power

Maputo

7 Nov. 26th (Sat)

1) Site survey of Mapoto, Matora and the suburbs[9:00]

2) Network analysis (Power flow calculation)

Maputo

8 Nov. 27th

(Sun)

1) Network analysis(Power flow calculation)

2) Organizing materials

Maputo

9 Nov. 28th

(Mon)

1) Site survey of the existing substations (Infulene Substation: Single line diagram, Specification of equipment and operation record)[9:00]

2) Technical discussion (EDM: Tender documents, substation drawings etc.) [11:00]

Maputo

A-2-1

No. Date (Day)

Contents Place to stay

JICA Consultant Sugiyama and

Yamamoto Hayashi, Kondo, Ito, Kinoshita and Kishi Kurumada

and Oda

10 Nov. 29th

(Tue)

1) Site survey of the existing substations (Matola Gale Substation, Machava Substation, Matola Substation, Boane Substation)[9:00]

Maputo

11 Nov. 30th

(Wed)

1) Internal meeting (Outline of the components)[11:00]

2) Site survey of the existing substations (Infulene Substation: Single line diagram, Specification of equipment and operation record)[14:00]

3) Power flow calculation 4) Review of draft M/D

Maputo

12 Dec. 1st

(Thu)

1) Site survey of the existing substations (Infulene Substation: Single line diagram, Specification of equipment and operation record)[9:00]

2) Request for quotation to local construction company(Socigol [13:30]、Engco Investimentos [15:30]、MCC[16:00])

3) Discussion (EDM: Outline of the components, Equipment of Infulene Substation, Mobile substation)Review of draft M/D

Maputo

13 Dec. 2nd

(Fri)

1) Site survey of the existing substations (Infulene Substation: Single line diagram, Specification of equipment and operation record)[9:00]

2) Request for quotation to local construction companies（Comac [10:00]）

3) Technical discussion (EDM: Network analysis )

4) Discussion (JICA Mozambique Office: Outline of the components, Equipment of Infulene Substation, Mobile substation) Review of

Maputo

14 Dec. 3rd

(Sat)

1) Trip (Haneda-Hong Kong)

2) Trip (Hong Kong-Johannesburg)

1) Network analysis(Power flow calculation)

2) Organizing materials

Maputo

15 Dec. 4th

(Sun)

1) Site visit (Infulene Substation)[11:00] Maputo

A-2-2

No. Date (Day)

Contents Place to stay

JICA Consultant Sugiyama and

Yamamoto Hayashi, Kondo, Ito, Kinoshita and Kishi Kurumada

and Oda

16 Dec. 5th

(Mon)

1) Site survey of the existing substations (Infulene Substation: Single line diagram, Specification of equipment and operation record)[9:00]

2) Technical discussion(EDM: Network analysis)[10:00]

3) Internal meeting (MD components)[16:00]

Maputo

1) Courtesy call (EDM: Explanation of draft MD)[18:30]

17 Dec. 6th

(Tue)

Technical discussion

1) Site survey of the existing substations (Infulene Substation: Single line diagram, Specification of equipment and operation record)[9:00]

2) Network analysis(Power flow calculation)Preparation for the

Maputo

1) Internal meeting (MD components)[18:00]

18 Dec. 7th

(Wed)

1) MD discussion (EDM)[8:00]

Maputo 1) Network analysis(Power flow

calculation) 2) Preparation for the Field Survey Report

19 Dec. 8th

(Thu)

1) Technical meeting (EDM: works of the recipient side and confirmation of MD)

1) Site survey of the existing substations (Infulene Substation: Single line diagram, Specification of equipment and operation record)[9:00]

2) Network analysis(Power flow calculation)

3) Preparation for the Field Survey Report

Maputo

20 Dec. 9th

(Fri)

1) Signing on MD

Maputo

1) Site survey of the existing substations (Infulene Substation: Single line diagram, Specification of equipment and operation record)[9:00]

2) Network analysis(Power flow calculation)

3) Preparation for the Field Survey Report

21 Dec. 10th (Sat)

1) Trip{Maputo–Johannes burg–Hong Kong}

1) Network analysis(Power flow calculation)

2) Organizing materials

Maputo

22 Dec. 11th

(Sun)

1) Trip{Hong Kong-Haneda}

1) Network analysis(Power flow calculation)

2) Organizing materials

Maputo

23 Dec. 12th

(Mon)

1) Technical discussion (EDM: Demand forecast, Tax exemption)[10:00]

2) Network analysis(Power flow calculation)

3) Preparation for the Field Survey Report

1) Trip{Narita–Hong Kong}

Maputo/On

board

A-2-3

No. Date (Day)

Contents Place to stay

JICA Consultant Sugiyama and

Yamamoto Hayashi, Kondo, Ito, Kinoshita and Kishi Kurumada

and Oda

24 Dec. 13th

(Tue)

1) Site survey of the existing substations (Infulene Substation)[9:00]

2) Technical discussion (EDM: Other donor projects)[10:00]

3) Network analysis(Power flow calculation)

4) Preparation for the Field Survey Report

1) Trip{Hong Kong–Johannesburg–Maputo}

Maputo

25 Dec. 14th

(Wed)

1) Technical discussion (EDM: Other donor projects)[10:00]

2) Site survey of the existing substations (CTM Substation)[13:00]

3) Preparation for the Field Report (draft) 4) Network analysis(Power flow

calculation) 5) Preparation for the Field Survey Report

1) Selection of the surveyor

Maputo

26 Dec. 15th

(Thu)

1) Site survey of the existing substations (Infulene Substation)[9:00]

2) Technical discussion (EDM: Confirmation of the components)[10:00]

3) Technical discussion (EDM: Field Report (draft))[16:00]

4) Network analysis(Power flow calculation)

5) Preparation for the Field Survey Report

1) Selection of the surveyor

Maputo

27 Dec. 16th (Fri)

1) Site survey of the existing substations (Infulene Substation)[10:00]

2) Signing on the Field Report[13:00] 3) Network analysis(Power flow

calculation) 4) Preparation for the Field Survey Report

1) Organizing Materials

2) Contract for the surveyor

Maputo

28 Dec. 17th (Sat)

1) Network analysis(Power flow calculation)

2) Preparation for the Field Survey Report

1) Preparation for the Field Survey Report

Maputo

29 Dec. 18th

(Sun)

1) Network analysis(Power flow calculation)

2) Preparation for the Field Survey Report

1) Preparation for the Field Survey Report

Maputo

30 Dec. 19th

(Mon)

1) Site survey of the existing substations (Infulene Substation)[9:00]

2) Network analysis(Power flow calculation)

3) Preparation for the Field Survey Report

1) Preparation for the Field Survey Report

Maputo

31 Dec. 20th

(Tue)

1) Site survey of the existing substations (Infulene Substation)[9:00]

2) Network analysis(Power flow calculation)

3) Preparation for the Field Survey Report

1) Trip{Maputo–Johannes burg–Hong Kong}

Maputo/On

board

A-2-4

No. Date (Day)

Contents Place to stay

JICA Consultant Sugiyama and

Yamamoto Hayashi, Kondo, Ito, Kinoshita and Kishi Kurumada

and Oda

32 Dec. 21st

(Wed)

1) Visit to Maputo City Customer Care Service Office[13:30]

2) Network analysis(Power flow calculation) 3) Preparation for the Field Survey Report

1) Trip{Hong Kong-Narita}

Maputo

33 Dec. 22nd

(Thu)

1) Site survey of the existing substations (Infulene Substation)[9:00]

2) Network analysis(Power flow calculation) 3) Report (JICA Mozambique Office)

Maputo

34 Dec. 23rd (Fri)

1) Trip{Maputo–Johannesburg–Hong Kong}

On board

35 Dec. 24th (Sat)

1) Trip{Hong Kong-Narita} -

(2) Second Field Survey

No. Date (Day)

Contents Place to stay JICA Consultant

Kobayashi and Soyama Hayashi, Kondo, Akashi, Kinoshita and Kishi

1 Apr. 23rd

(Sun)

1) Trip{Narita–Singapore–Johannesburg }

1) Trip{Narita–Hong Kong–Johannesburg } On

board

2 Apr. 24th

(Mon)

1) Trip{ Johannesburg–Maputo } 2) Courtesy call and explanation of the survey (JICA Mozambique Office)

[13:30] 3) Courtesy call, explanation of the project outline and the MD (MIREME)

[15:45]

Maputo

3 Apr. 25th

(Tue)

1) Courtesy call and explanation of the draft final report (EDM) [8:30] 2) Discussion with parties involved in World Bank project [14:30] 3) Discussion with EDM Finance Directorate [14:30]

Maputo

4 Apr. 26th

(Wed)

1) MD discussion (EDM) [8:30] 2) Discussion with Director Project in EDM [12:30] Maputo

5 Apr. 27th

(Thu)

1) Site survey of Infulene Substation and Matola gale Substation [9:00] 2) Discussion with Director Project in EDM [12:30] 3) Signing on MD (EDM) [16:00]

Maputo

6 Apr. 28th (Fri)

1) Report (JICA Mozambique office) [8:00] 2) Site survey of Infulene Substation [10:00] Maputo

7 Apr. 29th (Sat)

1) Trip{Maputo–Johannesburg–Singapore}

1) Trip{Maputo–Johannesburg–Hong Kong}

On

board

8 Apr. 30th

(Sun)

1) Trip{Singapore-Narita} 1) Trip{Hong Kong–Narita} -

A-2-5

A-3 List of Parties Concerned

in the Recipient Country

3. List of Parties Concerned in the Recipient Country

Organization and Name Title

Electricidade de Mozambique (EDM)

Mr. Mateus Magala CEO Mr. Carlos Yum Executive Board Member

Mr. Aly Sicola Impija Executive Board Member Mr. Fatima Arthur Executive Board Member Mr. Antonio Gimo Junior Director System Planning Mr. Feliciano Andre Massingue Director Transmission Network Mr. Joaqium Ou-chim Director Project Mr. Geta Pery Director Finance Mr. Alberto R. Banze Director Maputo City Customer Care Service Mr. Abraao Rafael Deputy Director Projects Ms. Olga Utchavo System Planning Mr. Celso Saete Infulene Substation Manager Mr. Cesar Alfane Project Manager (New Business Development) Mr. Jose Micas Project Manager Mr. Claudio Dambe Project Manager Mr. Eduardo Zacarias Bule Head of the Statistic and Planning Department Mr. Felix Bucuane Finance Directorate Mr. Joaozinho Joao Protection Engineer Mr. Adriano Mandlate Maintenance Department Mr. Teodato Pedro Cossa Electrical Engineer Heavy Maintenance Ms. Rachel A. Baalessanvu Electrical Engineer Mr. Julio Guivala System Planning Mr. Gilberto Muchaya System Planning Mr. Faustind Edvardo System Planning Ms. Aissa Naimo System Planning Environment Mr. Sebastian Ngugulo Transmission Planning Ms. Yaca Cabra Transmission Planning Mr. Gil Vilanculo Transmission Planning Mr. Eltas Miambo Operator, Boane Substation Mr. Cristovao Novele Lines Engineer Mr. Andre Djive Engineer Mr. Guilherme Tenjua Engineer Ms. Ninlsa Pelembe System Operator Mr. Eikor Mabuie System Operator

A-3-1

Ministerio dos Recursos Minerais e Energia

Mr. Eugenio Simbine National Director of Planning and Cooperation

The World Bank Mozambique Office

Mr. Claudio Buque Energy Specialist

Ms. Zayra Romo Senior Energy Specialist

Ministry of Public Works and Housing (MOPH)

Mr. Brito Antonio Soa National Director

Ms. Sérgio Sitoe Staff

JICA Mozambique Office

Mr. Katsuyoshi Sudo Chief Representative

Mr. Hidetake Aoki Senior Representative

Mr. Hiroyuki Tomura Representative

A-3-2

A-4 Minutes of Discussions

4. Minutes of Discussions (First Field Survey)

A-4-1

A-4-2

A-4-3

A-4-4

A-4-5

A-4

-6

A-4

-7

A-4-8

A-4-9

A-4-10

A-4-11

A-4-12

A-4-13

A-4-14

A-4-15

A-4-16

A-4-17

A-4-18

A-4-19

A-4-20

A-4-21

A-4-22

A-4-23

A-4-24

Minutes of Discussions (Second Field Survey)

A-4-25

A-4-26

A-4-27

A-4-28

A-4-29

A-4-30

A-4-31

A-4-32

A-4-33

A-4-34

A-4-35

A-4-36

A-4-37

A-4-38

A-4-39

A-4-40

A-4-41

A-4-42

A-4-43

A-4-44

A-4-45

A-4-46

A-4-47

A-4-48

A-4-49

A-5 Field Report

5.Field R

eport

A-5-1

A-5-2

A-5-3

A-5-4

A-5-5

A-5-6

A-5-7

A-5-8

A-6 Topographic & Geotechnical

Survey Report

INFULENE ELECTRICAL SUBSTATION

MATOLA CITY – MAPUTO PROVINCE

MOZAMBIQUE

GEOLOGICAL AND GEOTECHNICAL SURVEY

FINAL REPORT

INFULENE ELECTRICAL SUBSTATION

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ÍNDICE

1 - Introduction ........................................................................................................................................... 2

2 - Geological Settings ................................................................................................................................. 3

3 - Ground investigation works .................................................................................................................... 4

3.1. General ………………………………………………………………………………………………………………………………………………4

3.2. In situ tests ............................................................................................................................................. 7

3.2.1 SPT test ................................................................................................................................................. 7

3.2.2 DPL test .............................................................................................................................................. 10

3.2.2.1 General ............................................................................................................................................ 10

3.2.2.2 Results obtained ............................................................................................................................. 11

3.3 Water levels ........................................................................................................................................... 13

3.4 Undisturbed samples ............................................................................................................................. 13

3.5 Laboratory tests .................................................................................................................................... 14

4 - Geotechnical interpretation .................................................................................................................. 16

4.1. General ……………………………………………………………………………………………………………………………………………16

4.2. Geotechnical Zones .............................................................................................................................. 17

4.3. Geotechnical Parameters ..................................................................................................................... 18

5 - FOUNDATIONS CONSIDERATIONS ......................................................................................................... 18

5.1. Direct Foundations – Allowable Bearing Capacity ................................................................................ 18

5.2. Indirect Foundations – Bearing Capacities ........................................................................................... 20

6 - Final considerations .............................................................................................................................. 23

7 - Attachments ........................................................................................................................................ 26

Annex I – Triangular and size classification of soils

Annex II – Borehole and Photos

Annex III – Dynamic probing light

Annex IV – Laboratory tests

Annex V – Borehole location plan and interpretive cross-sections.

6.Topographic &

Geotechnical S

urvey Report

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1 - INTRODUCTION

As requested by YACHIYO ENGINEERING CO., LTD, Tecnasol Mozambique carried out a geological and

geotechnical investigation campaign for the expansion of the Infulene electrical substation, located at

Matola City, Maputo Province in Mozambique.

The purpose of this campaign was to make the geological-geotechnical characterization of the site, by the

means of borehole that allowed the lithology’s identification and evaluate their resistance characteristics

by performing SPT tests and two dynamic probing light (DPL). In this borehole, three undisturbed samples

were taken to perform geomechanical laboratory tests.

The locations of the borehole and DPL are show on the appended drawing (drawing nº P16/0495-

3749/001/0/11568).

In this report we describe the work done, the results obtained, geotechnical considerations and foundation

recommendation’s.

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2 - GEOLOGICAL SETTINGS

The area in question are represented on Maputo Geological Map (sheet 2532D3), published by

Mozambique National Department of Geology (1:50 000 scale), where the "Congolote Formation" (Qco),

dated at Quaternary, occurs. Is characterized by "coarse to fine grained sands (interior dunes)",

At the present location this formation is represented by fine to medium-grained silty sands, reddish brown,

loose to very dense.

Mozambican Geological Map,

Extract of Maputo Geological Map (sheet 2532D3) Site Location

Original scale – 1:50 000

Figure 1 – Maputo geological map extract, 1:50 000 (published scale) and borehole location

Study area

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3 - GROUND INVESTIGATION WORKS

3.1. General

The geological-geotechnical recognition program submitted by the Client included the realization of one

borehole and two Dynamic probing light (DPL). This borehole was vertical and was drilled with rotary

equipment. At the same time as the borehole was drilled, SPT tests were also carried out. These ones were

undertaken at intervals of 1.5 m or whenever the characteristics of the ground being drilled allowed.

The criterion adopted for the end of the borehole was to obtain 3 consecutives SPT test greater than 60

blows.

Undisturbed samples of cohesive soils was obtained at the top of each change of stratum and at a spacing

of not more than 1.5m in the borehole.

The works were implemented by Tecnasol based on the design provided by the Client.

3.1.1. DDrilling

As mentioned above, 1 vertical borehole was drilled, with 30.0 m depth.

This borehole is presented in the layout given by the Client (drawing nº P16/0495-3749/001/0/11568).

Table I indicated for the borehole, the coordinate and final depth.

Table I

Borehole Depth reached

(m) Coordinates

E N Z

BH1 30.0 452868.5070 7128746.2929 58.49

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The drilling was carried out using a rotary probe driven by a hydraulic diesel engine. The drilling is carried

out by means of the rotary action, transmitted by the rotating head of the drilling machine, to the assembly

constituted by the pins and the tip.

In this drilling process, the progression is made through the placement of new sections of tracks until the

desired depth is reached. Since the column is not very rigid, it is advisable to place a piece - "cardin" -

between the last hole and the rotating head of the machine.

In drilling, the action of a circulating fluid is not necessary since the helical shape promotes the raising of

the disaggregated material from the bottom of the hole to the surface, keeping the hole clean.

The borehole is considered to be finished and accepted when the defined stop criterion is reached.

Figure 2 - Drilling rig in borehole 1

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By using the results obtained from the drilling program carried out and combining this with the available

bibliographic information and reconnaissance work done at the site, it’s possible define the litho-

stratigraphic units shown in Table II and described below.

Table II

Age Formation Lithology

Recent Top soil Light brown, dry, fine grained silty sand,

Quaternary Congolote Formation

(Qco)

Reddish brown, dry to moist, fine grained silty sand,

loose to medium dense

Reddish brown, moist, fine grained, clayey silty

sand, medium dense to very dense

Recent – Top soil

Sands – Were identified with 3.0 m thicknesses, corresponding to light brown, dry, fine-grained silty

sand.

Quaternary – Congolote Formation (Qco)

Silty sand – were identified between 3.0m and 19.0 m, corresponding to reddish brown, dry to

moist, fine grained silty sand.

Clayey-silty sand – were identified from 19m to the maximum prospected depth, corresponding to

reddish brown and whitish, moist, clayey-silty sand.

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3.2. In situ tests

3.2.1 SPT test

The objective of dynamic penetration tests, SPT type, is to determine the resistance of the ground to the

penetration of a standardised sampling probe while also taking representative samples. These tests are

carried out inside boreholes at previously defined depths and whenever there is a change of lithology.

The test consists of driving a standard probe by the application of dynamic energy produced through the

dropping of a pile driver. The dropping height and the weight of the pile driver are both standard: the pile

driver weighs 63.5 Kg (140 lb), while the dropping height is 76 cm (30 in). The pile driver is released by an

automatic device.

Before the test is started, the borehole is cleaned of any debris in order that the sampler can enter the

ground without any interference. When the test was done in ground where the borehole walls were

unstable it was necessary to case those boreholes. The sampler, connected to a string of rods, is lowered

to the depth where the test is to be carried out. The sampler comprises a steel tube 457 mm long, with

exterior and interior diameters of 51 mm and 35 mm, respectively.

Figure 3 – SPT sampler

After the test starts, a note is taken of the number of blows necessary for the sampler to penetrate 15 cm

(6in). Following that, a note is taken of the number of blows necessary for the sampler to penetrate 30 cm

(12in). When the sampler does not penetrate 30 cm with 60 blows, the penetration achieved for 60 blows

is noted. This is the end of the test. After the test is completed, the sampler is opened by the operator and

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the visual appearance of the sample is recorded, as are any transition zones, the sample length, etc. The

last 15 cm of the sample are put into a sealed container. A label put inside the container records the

number and name of the project, the date, the borehole name (or number), the depth at which the sample

was collected, and the test results (number of blows in the different phases and respective penetrations).

Figure 4 – Standard Penetration Test Phases

Through the carrying out of the SPT tests it is possible to relate the number of blows needed to penetrate

the sampler into the ground with unconfined compressive strength or with compacity (Terzaghi and Peck,

“Soil Mechanics in Engineering Practice”).

For the analysis of the results, it is necessary to make corrections related to depth and energy dissipation.

The first correction has to be made since the tension caused by the weight of the ground itself influences

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the results, while the second correction concerns the dissipation of the “theoretical” energy corresponding

to the pile driver weight and the height the pile driver is dropped until its hits the tip.

The value corrected for depth is given by the following formula:

N1 = CN × N

Where CN is the correction factor and N is the number of blows counted in the test.

When an automatic pile driver triggering device is used, energy dissipation is 40%, in other words, only 60%

of the potential energy reaches the tip of the equipment.

In the case of the automatic device used in the work in question, the correction is:

Nd = 0,60 × N1

The tests were done at regular intervals, every 1.5 m, using a standard sampler (Terzaghi sampler), with a

total of 20 tests being carried out. Table III presents, by borehole, the NSPT values obtained.

Table III

Depth (m)

1.5 3.0 4.5 6.0 6.60 9.0 10.5 11.1 12 13.5 15.0 16.5 18.0 18.6 21.0 22.5 24 25.5 27 28.5 30

Nspt 3 5 7 US 14 17 U.S 15 16 20 19 5 U.S 23 28 33 49 25 60 60 60

NSPT≤20 23≤NSPT≤49 NSPT ≥60

U.S – Undisturbed Sample

The results are presented in the appended borehole description and interpretative cross-sections show at

drawings nº. P16/0495-3749/001/0/11568.

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3.2.2 DPL test

3.2.2.1 General

The DPL test is an expedited and fast execution test, applicable to soil and / or soil behavioral materials and

to depths of penetration of the order of ten meters.

The dynamic probing light (DPL) is integrated into a group of dynamic penetrometers whose basic principle

is the crimping of a standard part with known geometric characteristics, using for that purpose a quantity

of energy that can be scaled.

The test with this penetrometer evaluates the resistance offered by the ground to the penetration of a

conical tip, connected to the tip of metal rods, which is driven by a force of shock, that is, by the action of a

pylon with standard weight and fall.

The test with the light dynamic penetrometer consists of dropping a standardized height of 50 cm,

weighing 10 kg, by counting the number of strokes (n) required to penetrate a 10 cm Conical shape

attached to the tip of the rods.

The pestle is released automatically and moves along the guide rod so as to hit the steel hold that drives

the descent of the set of rods, at the tip of which the cone is connected, to the depth of execution of the

test.

In general, the test is terminated when the number of strokes reaches values between 125 and 150 strokes,

for penetrations equal to or less than 10 cm. The experience in the execution of this type of tests allows to

admit that, for values of this order of magnitude, there will already be in the presence of compact and / or

consistent formations.

In the present case, two (2) tests were carried out, for each test, the depth reached and the coordinates

were presented in Table IV.

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Table IV

3.2.2.2 Results obtained

The results of the DPL tests are expressed as a function of the depth reached by the conical tip, by the

number of strokes corresponding to every 10 cm. Thus, for the different depths, the value of the resistance

to the penetration of the terrain (qd) is determined by the following equation:

)(kg/cm )(

Mn =q 2

2

d PMEAH

Where:

M - weight of the pestle;

H - dropping height of the pylon;

A - area of the base of the cone;

E – penetration;

P - weight of cone assembly, guide rod and stand;

N - number of strokes for feed E.

Test Depth reached (m)

Coordinates E N Z

DPL01 11.0 454461 7137121 58.44

DPL02 11.0 454442 7137124 58.43

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The results of the tests are expressed in graphical form, depending on the depth reached by the cone, by

the number of strokes for a 10 cm crimping and the corresponding apparent dynamic resistances. Thus, the

results of the tests carried out are presented in the graphic form.

The graphs shown are:

- Number of strokes (Nd) vs depth

- Dynamic resistance (Qd) vs depth

- Correlation Nº of strokes DPL (Nd) vs Nº strokes NSPT (NSPT = 0.7Nd)

The following figure illustrate the execution of DPL in the Infulene electrical substation.

Figure 5 – Illustration of DPL-01 and DPL-02 works at the site

Field works included DPL tests developed throughout January on dry weather conditions and DPL features

are given in Table V below.

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Table V

Ref. Date

Final Depth

UTM Coordinates (WGS84) Water

level (m)

Depth of blow count (m) Depth of Qd (m)

Refusal (Y/N)

(m) E S <17 17 - 30 > 30 < 8 MPa 8 – 12 MPa > 13 MPa

DPL-01 25/01/17 11.0 454461 7137121 ND 0.4 – 5.8 8.0 – 8.5

0.0 – 0.4 8.5 – 9.9 9.9 – 11

-– 0.4 – 5.6 8.1 – 8.5 9.4 – 9.9

0.0 – 0.4 5.6 – 8.1

9.9 – 11.0 -- No

DPL-02 25/01/17 11.0 454461 7137124 ND 0.0– 5.1 5.1 – 5.4 6.1 – 9.6

9.6 – 11.0 0.0 – 5.0 5.4 – 6.0

5.0 – 5.4 6.0 – 8.9

9.0 – 11.0 No

3.3 Water levels

The water levels were measured in all the boreholes at 12 hours intervals - at the beginning and at the end

of the work day. These measurements are shown in Table VI.

Table VI

Borehole Date Water level depth (m)

Depth borehole (m) Beginning of shift End of shift

BH1

17/01 – Moist 10

18/01 Moist Moist 20.0

19/01 Moist Moist 30.0

According to the table VI, and the observations made in the field to control and evaluate the behavior of

the local water level, it can be affirmed that in the study area, up to the depths reached, no water levels

were detected.

3.4 Undisturbed samples

In order to characterize the occurring lithology in geomechanical terms, Tecnasol perform a collection of 3

undisturbed samples using a Moran sampler. After collection, each sample was suitably packaged, sealed

and referenced.

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Figure 6 – Moran sampler

Table VII indicate the collection depths and the respective lithologies.

Table VII

Borehole Depth (m) lithologies

BH1

6.0 – 6.60 Reddish brown, silty sand

10.50 – 11.10 Reddish brown, silty sand

18.0 – 18.60 Reddish brown, clayey-silty sand

3.5 Laboratory tests

In order to determine some geomechanical parameters of the soils, 3 undisturbed samples were tested.

The collected samples were subjected to the following laboratorial tests:

Particle size by sieving;

Atterberg limits (LL, PL and PI);

Water content of soil;

Specific gravity;

Unconfined compressive strength of cohesive soils;

Consolidated-undrained triaxial compression test.

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Soil laboratory testing results are summarized in the following table. The complete laboratory data records are available in the attached to this report.

Table VIII

Boreholes Type of

sample

Depth

(m)

Particle

size

%<P200

(0.074m

m)

Atteberg limits

Moisture

Content

Classification Specific

gravity

Unconfined

compression

Triaxial compression test

LL (%) IP (%) (%) ASTM AASHTO g/cm3

qu

E (MPa)

qu

E (MPa)

σ3

ф

(KP)

σ1

ф

(KPA)

C

ф

( o )

C`

ф

( o )

BH1

U.S 6.0 – 6.60 14.3 N/P N/P 4.8 SM A-2-4(0) 2,626 29.8

5500

U.S 10.50 – 11.10 14.9 N/P N/P 9.6 SM A-2-4 (0) 2,611

13.7

--

50

100

200

214

410

828

2

37

0

34 1346

U.S 18.0 – 18.60 20.8 19.9 4.6 14.8 SC-

SM A-2-4 (0) 2,590

19.2

1323

US-Undisturbed sample

From the laboratory test is important to say that, the quantities of triaxial tests original planned (3

samples), were only one was tested, and two not tested because, undisturbed samples, as the name

implies, are samples that must be prepared respecting the conditions in which they arrive at the

Laboratory.

Soils without cohesion or weak cohesion, soils with relatively large fragments of rock, completely saturated

soils being very soft, are some examples that hinders the first phase of the test, which is the preparation

and molding of the test speciment.

These test pieces must have a height to diameter ratio of 1.8 to 2.0 and for the triaxial test 3 test pieces are required under these conditions. The samples collected in this process 12117, had the conditions described below:

- BH-01 (6,00 - 6,60) - Sample with poor cohesion. Phase of the molding: sample very sensitive to touch, split easily. We only get a sample with the required dimensions. (Figure 8), so it was not possible to perform the Triaxial Test.

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- BH-01 (10,50 - 11,10) - Sample with slight cohesion. Phase of the molding: the slight cohesion of

this sample allowed us to obtain the three test specimens to the test.

- BH-01 (18,00 - 18,60) - Sample with some cohesion, but completely saturated. Phase of the

molding: the sample presented with much water, being a fine sand slightly clayey, became very soft

and could not support the own weight. Any attempt to level the faces or cut with the required

measurement, the specimen completely deformed. We obtained only one specimen from a sample

area with less water. (Figure 9), situation that don’t allowed to perform the Triaxial Test.

Figure 8 and 9 – Preparation of samples for triaxial tests.

4.1. General

The geotechnical considerations set out in the following items are based on the obtained data from the

ground investigation works and laboratory tests specifically defined for this design.

4 - GEOTECHNICAL INTERPRETATION

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4.2. Geotechnical Zones

Based on the analysis and interpretation of the results obtained in the surveys carried out, three

geotechnical zones were defined: GZ3 to GZ1, as indicated in the interpretive cross-section (drawings nº.

P16/0495-3749/001/0/11568) attached.

Geotechnical Zone 3 (GZ3)

This is the worst geotechnical zone and was defined from the surface to a maximum depth of 18.6 m.

Is represented by top soil and silty sands. The NSPT values in this zone are between 3 and 20.

Geotechnical Zone 2 (GZ2)

This zone was defined underlying GZ3, with a thicknesses of 8.4 m. Is represented by reddish brown clayey-

silt sand, with NSPT values between 23 and 49, but most frequent between 23 to 33 blows.

Geotechnical Zone 1 (GZ1)

This is the zone with the best geotechnical characteristics, developing to the maximum prospected depths.

Is represented by reddish brown, clayey-silty sand, with NSPT values greater 60 blows.

The following table presents the depths to which the different geotechnical zones defined above are

intersected (Table IX).

Table IX

Borehole GZ3 GZ2

GZ1

BH1 0.0 – 18.6 18.6 – 27.0 27.0 – 30.0

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4.3. Geotechnical Parameters

Following the available information, having for base the results of the geotechnical investigation and the

area recognition, it’s possible to suggest the following geotechnical parameters for the geotechnical zones

previously defined (Table X).

Table X

1 - More frequent values

The values of geotechnical parameters shown correspond to the estimates for the extreme values of SPT

interested in this area. For intermediate values of SPT, the parameters should be estimated by

interpolation.

5 - FOUNDATIONS CONSIDERATIONS

5.1. Direct Foundations – Allowable Bearing Capacity

According to information received, the future structures’ ground level shall be located approximately 1.0m

to 2.0m depth from grade level, which means that the ZG3 geotechnical zone will be the direct foundations

general supporting stratum.

Zones Description SPT

(Blows)

Specific gravity

(KN/m3)

Angle of internal friction

´(º)

Cohesion

c´ (kPa)

Deformability modulus E’s (MPa)

GZ3 (Brown and reddish

brown, silty sand) Top soil.

3 – 20

(5 - 15)1

16 - 18 25 - 35 -- 5 - 30

GZ2 Reddish Brown, silty

sand.

23 – 49

(23 - 33)1 18 - 20 36 - 39 -- 30 - 45

GZ1 Reddish brown, clayey-silty sand

60 22 42 -- 75

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In the presented document, the method proposed by Bowles (1988) for allowable bearing capacity

estimate was adopted, based on correlations with SPT values.

This simplified method assumes the following fundamental principles:

1. Inclination ground surface below 10%;

2. Homogeneous soil characteristics in the influence area of the footing (0.5xB above and 2.0xB below

footing);

3. Resultant of action loads presenting inclination lower than 10% with vertical direction;

4. Maximum limit settlement = 25mm.

Due to some heterogeneity regarding the ZG3 SPT values, the following allowable bearing pressures were

estimated for two scenarios, corresponding to foundations located at 1.0m and 2.0m depth, according to

the SPT average values and foundation widths (B):

Table XI

Geotechnical Zone

Foundation width, B (m)

Significant depth (1.0m+1.5xB to 2.0B)

(m) SPT average value

Allowable pressure, qa

(kPa)

ZG3

1.0 2.5 to 3.0 = 3 75

2.0 4.0 to 5.0 = (3+5+7)/3=5 80

3.0 5.5 to 7.0 = (3+5+7+14)/4=7.25 ≈ 7.0 100

4.0 7.0 to 9.0 = (3+5+7+14+17)/5=9.2 ≈ 9.0 120

5.0 8.5 to 11.0 = (3+5+7+14+17+15)/6=10.17 ≈ 10.0 140

Table XI – Foundations located at 1.0m depth - Allowable pressures

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Table XII

Geotechnical Zone

Foundation width, B (m)

Significant depth (2.0m+1.5xB to 2.0B)

(m) SPT average value

Allowable pressure, qa

(kPa)

ZG3

1.0 3.5 to 4.0 = 5 75

2.0 5.0 to 6.0 = (5+7)/2 = 6.0 80

3.0 6.5 to 8.0 = (5+7+14)/3=8.67 ≈ 8.5 100

4.0 8.0 to 10.0 = (5+7+14+17)/4=10.75 ≈ 10.5 120

5.0 9.5 to 12.0 = (5+7+14+17+15)/5=11.6 ≈ 11.5 140

Table XII – Foundations located at 2.0m depth - Allowable pressures

In case of maximum limit settlement less than 25mm and/or foundation width exceeding 5.0m, a

settlement analysis shall be performed.

It’s important to highlight that the presented value estimates shall be used in low precision design

calculations. Otherwise, other direct foundation design methods are recommended such as, for example,

Meyerhof, Hansen or Eurocode 7 formulations.

5.2. Indirect Foundations –Bearing Capacities

As an alternative to a direct foundations system, a methodology to estimate indirect foundations (piles)

bearing capacity is presented.

The design method suggested uses a semi-empirical model developed by Bustamante & Gianeselli called

experimental-penetrometer method. This method is based on the information collected from a large

number of load tests, which supplied experimental data used to validate design methods based on CPT

tests results, on this case obtained through correlation between SPT tests and qc values.

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Considering the methodology mentioned, compressive ground resistance of each foundation element, Rcd is

obtained adding the relative portions of limit base resistance and limit shaft resistance, affected by its

respective partial safety factors. The result shall be compared to the axial compressive load in service

conditions.

- s

sk

b

bkcd

RRR

where:

Rbk is the characteristic base resistance;

Rsk is the characteristic shaft resistance;

b is a partial safety factor for base resistance, equal to 3.0;

s is a partial safety factor for shaft resistance, equal to 2.0;

The characteristic base resistance is calculated through the following expression:

- AkqR ccbk

where:

qc is the unit cone resistance (CPT) calculated by correlation with the average number of

blows of the SPT test obtained in the distance between 1.5D above the base and 1.5D

bellow (qc~0.4 x NSPT,mean (MPa) for sands/silty sands);

kc is the penetrometer factor, function of soil type and execution techniques;

A is the pile base section.

The shaft resistance is obtained as follows:

- i

ii,ssk )lPq(R

where:

li is the thickness of stratum i;

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P is the pile perimeter;

qs.i is the unit shaft resistance along stratum i, calculated based on unit cone resistance (CPT),

qc, and factor , dependant on soil type and execution techniques:

i

i.ci.s

qq

The maximum values of qs.i to adopt in each case, as well as the penetrometer factor kc and coefficient

can be found in the following tables (sand):

Table XIII

Table XIII – maximum values of qs.i and coefficient

Table XIV

Table XIV – penetrometer factor kc

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As an example of the described method, the following tables indicate the estimate bearing capacities for

Ø600, Ø800 and Ø1000mm drilled piles, for the geological-geotechnical information collected by borehole

BH1 and pile base at midpoint of GZ2 (Lpile = 22.0m).

Table XV

Borehole

Pile

Diameter

(mm)

Geotechnical

Zone

SPT

average value

qc

(Mpa)

qs

(Mpa)

qs,lim

(Mpa)

l

(m)

Rsk

(kN) Kc

Rbk

(kN)

Rcd

(kN)

BH1

600 GZ3 12.1 4.84 60 0.081 0.035 17.5 1154 - -

1594 GZ2 33.75 13.5 150 0.09 0.12 4.5 763 0.5 1909

800 GZ3 12.1 4.84 60 0.081 0.035 17.5 1539 - -

2410 GZ2 33.75 13.5 150 0.09 0.12 4.5 1018 0.5 3393

1000 GZ3 12.1 4.84 60 0.081 0.035 17.5 1924 - -

3365 GZ2 33.75 13.5 150 0.09 0.12 4.5 1272 0.5 5301

Table XV – Pile bearing capacity in BH1 influence area and pile base at midpoint of GZ2 (Lpile = 22.0m)

6 - FINAL CONSIDERATIONS

The analysis and interpretation of the results obtained through the geological and geotechnical

investigation and the geotechnical zones defined (drawings nº. P16/0495-3749/001/0/11568) turns

possible the following considerations:

a) Lithology

The following sequence strata characterize the study area:

Top soil (brown, dry, silty sandy);

Congolote Formation (reddish brown, silty sand and clayey-silty sand).

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b) Water level

According to water levels measured during the execution of borehole, it is not expected the

occurrence of groundwater in the study area to the prospected depths.

c) Foundation

The solution to adopt for foundations should be according to the loads to be transmitted, combined

with the geotechnical characteristics of the foundation soil.

Two foundation types are suggested in Chapter 5 of the present Report – direct and indirect

foundations - and an estimate of the respective bearing capacities is also presented for different

types of foundation geometries.

The choice on the type of foundation to be adopted shall be performed by the Foundations

Engineer, according to the information provided in the present Geotechnical Report and the future

structures’ load characteristics.

The presented considerations shall be conveniently evaluated at construction stage by a specialist, in order

to confirm the assumptions made in the present Geotechnical Report.

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Maputo, March 2017

Arlindo Eduardo Mauelele

TECNASOL

Geologist

André Pombinho

TECNASOL

Civil Engineer

Paulo Rodrigues

TECNASOL

Geologist

Gonçalo Oliveira

TECNASOL

Geologist

André Costa

TECNASOL

Civil Engineer

José Pedro Azevedo

TECNASOL

Civil Engineer

Paulo RodriguesG l Oli i

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7 - ATTACHMENTS

Annex I – Triangular and size classification of soils

Annex II – Boreholes and Photos

Annex III – Dynamic probing Light

Annex IV – Laboratory tests

Annex V – Borehole location plant and interpretive cross-sections.

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FINAL REPORT

ANNEX I – Triangular and size classification of soils

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ANNEX II – BOREHOLES AND PHOTOS

A-6-15

STARTED: COMPLETED:

DIAM

ETER

S

GEOT

ECH.

ZON

E

No. of blows (N)

STRA

TIGR

AFY S.P.T.

1st

Ph

ase

600

2nd

and

3rd

Pha

ses

Pe

ne

t. (c

m)

TESTS AND SAMPLING

DESCRIPTION

LITH

OLOG

Y

ELEV

ATIO

N

DEPT

H (m

)

DATE

S

RECOVERY

R.Q.D.

PERCENTAGE

WEA

THER

ING

FRAC

TURA

TION

0 100%

WORK: BOREHOLE

WORK No

DEPTH:H:N: E: DIRECTION: Proj. No.ROTARY BORINGWATER LEVEL Logger

Geolog.

PIEZOMETRIC

DETECTED

EQUIPMENT:

CASINGBORING

DEG. FROM HORIZ.:

Page 1 of 4

CLIENT:

LOCATION:

0,00

0,50

1,00

1,50

2,00

2,50

3,00

3,50

4,00

4,50

5,00

5,50

6,00

6,50

7,00

7,50

8,00

8,50

9,00

9,50

10,00

58,0

57,5

57,0

56,5

56,0

55,5

55,0

54,5

54,0

53,5

53,0

52,5

52,0

51,5

51,0

50,5

50,0

49,5

49,0

48,5

BH1

Mustang A-32 CB 17/01/2017 19/01/2017

16001

7137049 454503 58.49 m 30.0 m PC16/495/AAP

JAN/17

JAN/17

AEM

GO/CP

Hollow stem augers ø = 200mm

90º

Tests

Infulene, Matola City, Maputo Province.

Substation in Infulene, Maputo.

Notes: U.S - Undisturbed sample

1+2

2+3

3+4

6+8

8+9

30

30

30

30

30

(0,00, 3,00)Light brown, dry, fine grained, silty sand, very

loose.

(3,00, 10,00)Reddish brown, dry to moist, fine grained, silty

sand, loose to medium dense.

1

2

2

6

6

STARTED: COMPLETED:

DIAM

ETER

S

GEOT

ECH.

ZON

E

No. of blows (N)

STRA

TIGR

AFY S.P.T.

1st

Ph

ase

600

2nd

and

3rd

Pha

ses

Pe

ne

t. (c

m)

TESTS AND SAMPLING

DESCRIPTION

LITH

OLOG

Y

ELEV

ATIO

N

DEPT

H (m

)

DATE

S

RECOVERY

R.Q.D.

PERCENTAGE

WEA

THER

ING

FRAC

TURA

TION

0 100%

WORK: BOREHOLE

WORK No

DEPTH:H:N: E: DIRECTION: Proj. No.ROTARY BORINGWATER LEVEL Logger

Geolog.

PIEZOMETRIC

DETECTED

EQUIPMENT:

CASINGBORING

DEG. FROM HORIZ.:

Page 2 of 4

CLIENT:

LOCATION:

10,00

10,50

11,00

11,50

12,00

12,50

13,00

13,50

14,00

14,50

15,00

15,50

16,00

16,50

17,00

17,50

18,00

18,50

19,00

19,50

48,5

48,0

47,5

47,0

46,5

46,0

45,5

45,0

44,5

44,0

43,5

43,0

42,5

42,0

41,5

41,0

40,5

40,0

39,5

39,0

BH1

Mustang A-32 CB 17/01/2017 19/01/2017

16001

7137049 454503 58.49 m 30.0 m PC16/495/AAP

JAN/17

JAN/17

AEM

GO/CP

Hollow stem augers ø = 200mm

90º

Tests

Infulene, Matola City, Maputo Province.

Substation in Infulene, Maputo.

Notes: U.S - Undisturbed sample

7+8

7+9

9+11

9+10

2+3

10+13

30

30

30

30

30

30

(10,00, 19,00)Reddish brown, dry to moist, fine grained, silty

sand, medium dense to loose.

(19,00, 20,00)Reddish brown, moist, fine grained, clayey-

silty sand, medium dense

6

7

8

7

3

8

A-6-16

STARTED: COMPLETED:

DIAM

ETER

S

GEOT

ECH.

ZON

E

No. of blows (N)

STRA

TIGR

AFY S.P.T.

1st

Ph

ase

600

2nd

and

3rd

Pha

ses

Pe

ne

t. (c

m)

TESTS AND SAMPLING

DESCRIPTION

LITH

OLOG

Y

ELEV

ATIO

N

DEPT

H (m

)

DATE

S

RECOVERY

R.Q.D.

PERCENTAGE

WEA

THER

ING

FRAC

TURA

TION

0 100%

WORK: BOREHOLE

WORK No

DEPTH:H:N: E: DIRECTION: Proj. No.ROTARY BORINGWATER LEVEL Logger

Geolog.

PIEZOMETRIC

DETECTED

EQUIPMENT:

CASINGBORING

DEG. FROM HORIZ.:

Page 3 of 4

CLIENT:

LOCATION:

20,00

20,50

21,00

21,50

22,00

22,50

23,00

23,50

24,00

24,50

25,00

25,50

26,00

26,50

27,00

27,50

28,00

28,50

29,00

29,50

38,5

38,0

37,5

37,0

36,5

36,0

35,5

35,0

34,5

34,0

33,5

33,0

32,5

32,0

31,5

31,0

30,5

30,0

29,5

29,0

BH1

Mustang A-32 CB 17/01/2017 19/01/2017

16001

7137049 454503 58.49 m 30.0 m PC16/495/AAP

JAN/17

JAN/17

AEM

GO/CP

Hollow stem augers ø = 200mm

90º

Tests

Infulene, Matola City, Maputo Province.

Substation in Infulene, Maputo.

Notes: U.S - Undisturbed sample

13+15

15+18

21+28

15+10

29+31

31+29

30

30

30

30

25

23

(20,00, 27,00)Reddish brown, moist, fine grained, clayey-

silty sand, medium dense to dense

(27,00, 30,28)Reddish brown, moist, fine grained, clayey-

silty sand, very dense.

11

10

18

6

24

26

STARTED: COMPLETED:

DIAM

ETER

S

GEOT

ECH.

ZON

E

No. of blows (N)

STRA

TIGR

AFY S.P.T.

1st

Ph

ase

600

2nd

and

3rd

Pha

ses

Pe

ne

t. (c

m)

TESTS AND SAMPLING

DESCRIPTION

LITH

OLOG

Y

ELEV

ATIO

N

DEPT

H (m

)

DATE

S

RECOVERY

R.Q.D.

PERCENTAGE

WEA

THER

ING

FRAC

TURA

TION

0 100%

WORK: BOREHOLE

WORK No

DEPTH:H:N: E: DIRECTION: Proj. No.ROTARY BORINGWATER LEVEL Logger

Geolog.

PIEZOMETRIC

DETECTED

EQUIPMENT:

CASINGBORING

DEG. FROM HORIZ.:

Page 4 of 4

CLIENT:

LOCATION:

30,0028,5

BH1

Mustang A-32 CB 17/01/2017 19/01/2017

16001

7137049 454503 58.49 m 30.0 m PC16/495/AAP

JAN/17

JAN/17

AEM

GO/CP

Hollow stem augers ø = 200mm

90º

Tests

Infulene, Matola City, Maputo Province.

Substation in Infulene, Maputo.

Notes: U.S - Undisturbed sample

60+013

30

A-6-17

SUBSTATION IN INFULENE – GEOTECHNICAL GEOLOGICAL PROSPECTING BOREHOLE 1

0.0 – 16.50 m

SUBSTATION IN INFULENE – GEOTECHNICAL GEOLOGICAL PROSPECTING BOREHOLE 1

16.50 m – 30.0 m

A-6-18

INFULENE ELECTRICAL SUBSTATION

GEOLOGICAL AND GEOTECHNICAL SURVEY

FINAL REPORT

ANNEX III – DYNAMIC PROBING LIGHT

10,0 kg 1,0 m0,5 m 4,20 kg

2,925 kg 0,1 m

Technician: Verified by:

Obs: At 5m depth is observed a light humidityArlindo MaueleleGonçalo Oliveira

Location: Infulene - Maputo Z = 58.44 m 25-01-2017

Hammer mass = Length of drive rods =

Prof: 11.0 mHeight of fall = Avil + guide rod =Weight of drive rods = Unit interval=

Dynamic Probing Light

SUBSTATION IN INFULENECoordinates (WGS84):

DPL-01M = 454463.443 mP = 7137119.094 m Date:

0 10 20 30 40 50 600,0

1,0

2,0

3,0

4,0

5,0

6,0

7,0

8,0

9,0

10,0

11,0

DEP

TH (m

)

BLOWS N(10)

0,0

1,0

2,0

3,0

4,0

5,0

6,0

7,0

8,0

9,0

10,0

11,0

0,0 10,0 20,0 30,0

Rd (MPa)

0,0

1,0

2,0

3,0

4,0

5,0

6,0

7,0

8,0

9,0

10,0

11,0

0,0 5,0 10,0 15,0

Qd (MPa)

A-6-19

N(10) Rd (MPa) Qd (MPa) N(10) Rd (MPa) Qd (MPa)

0,0 0,1 8 3,9 2,3 7,6 7,7 22,0 10,6 2,8

0,1 0,2 17 8,2 4,8 7,7 7,8 22,0 10,6 2,8

0,2 0,3 17 8,2 4,8 7,8 7,9 20,0 9,6 2,6

0,3 0,4 17 8,2 4,8 7,9 8,0 20,0 9,6 2,6

0,4 0,5 10 4,8 2,8 8,0 8,1 15,0 7,2 1,8

0,5 0,6 8 3,9 2,3 8,1 8,2 13,0 6,3 1,6

0,6 0,7 6 2,9 1,7 8,2 8,3 10,0 4,8 1,2

0,7 0,8 6 2,9 1,7 8,3 8,4 13,0 6,3 1,6

0,8 0,9 5 2,4 1,4 8,4 8,5 12,0 5,8 1,4

0,9 1,0 5 2,4 1,4 8,5 8,6 18,0 8,7 2,1

1,0 1,1 5 2,4 1,2 8,6 8,7 18,0 8,7 2,1

1,1 1,2 5 2,4 1,2 8,7 8,8 20,0 9,6 2,4

1,2 1,3 6 2,9 1,4 8,8 8,9 18,0 8,7 2,1

1,3 1,4 5 2,4 1,2 8,9 9,0 24,0 11,6 2,9

1,4 1,5 5 2,4 1,2 9,0 9,1 18,0 8,7 2,0

1,5 1,6 5 2,4 1,2 9,1 9,2 18,0 8,7 2,0

1,6 1,7 5 2,4 1,2 9,2 9,3 20,0 9,6 2,2

1,7 1,8 5 2,4 1,2 9,3 9,4 18,0 8,7 2,0

1,8 1,9 5 2,4 1,2 9,4 9,5 15,0 7,2 1,7

1,9 2,0 4 1,9 1,0 9,5 9,6 12,0 5,8 1,3

2,0 2,1 6 2,9 1,3 9,6 9,7 15,0 7,2 1,7

2,1 2,2 6 2,9 1,3 9,7 9,8 15,0 7,2 1,7

2,2 2,3 6 2,9 1,3 9,8 9,9 15,0 7,2 1,7

2,3 2,4 8 3,9 1,7 9,9 10,0 19,0 9,2 2,1

2,4 2,5 9 4,3 1,9 10,0 10,1 20,0 9,6 2,1

2,5 2,6 8 3,9 1,7 10,1 10,2 19,0 9,2 2,0

2,6 2,7 9 4,3 1,9 10,2 10,3 20,0 9,6 2,1

2,7 2,8 10 4,8 2,1 10,3 10,4 20,0 9,6 2,1

2,8 2,9 12 5,8 2,5 10,4 10,5 19,0 9,2 2,0

2,9 3,0 11 5,3 2,3 10,5 10,6 15,0 7,2 1,6

3,0 3,1 9 4,3 1,7 10,6 10,7 19,0 9,2 2,0

3,1 3,2 10 4,8 1,9 10,7 10,8 19,0 9,2 2,0

3,2 3,3 10 4,8 1,9 10,8 10,9 20,0 9,6 2,1

3,3 3,4 11 5,3 2,1 10,9 11,0 20,0 9,6 2,1

3,4 3,5 11 5,3 2,13,5 3,6 11 5,3 2,13,6 3,7 11 5,3 2,13,7 3,8 11 5,3 2,13,8 3,9 13 6,3 2,43,9 4,0 13 6,3 2,44,0 4,1 13 6,3 2,24,1 4,2 13 6,3 2,24,2 4,3 14 6,8 2,34,3 4,4 14 6,8 2,34,4 4,5 15 7,2 2,54,5 4,6 14 6,8 2,34,6 4,7 13 6,3 2,24,7 4,8 13 6,3 2,24,8 4,9 13 6,3 2,24,9 5,0 13 6,3 2,25,0 5,1 15 7,2 2,35,1 5,2 15 7,2 2,35,2 5,3 15 7,2 2,35,3 5,4 15 7,2 2,35,4 5,5 16 7,7 2,45,5 5,6 17 8,2 2,65,6 5,7 16 7,7 2,45,7 5,8 17 8,2 2,65,8 5,9 19 9,2 2,95,9 6,0 22 10,6 3,46,0 6,1 17 8,2 2,46,1 6,2 19 9,2 2,76,2 6,3 19 9,2 2,76,3 6,4 24 11,6 3,36,4 6,5 23 11,1 3,26,5 6,6 20 9,6 2,86,6 6,7 18 8,7 2,56,7 6,8 18 8,7 2,56,8 6,9 18 8,7 2,56,9 7,0 18 8,7 2,57,0 7,1 21 10,1 2,77,1 7,2 21 10,1 2,77,2 7,3 22 10,6 2,87,3 7,4 23 11,1 3,07,4 7,5 22 10,6 2,87,5 7,6 21 10,1 2,7

Technician: Verified by:

Obs: At 5m depth is observed a light humidityArlindo MaueleleGonçalo Oliveira

Location: Infulene - Maputo Z = 58.44 m 25-01-2017

Prof. (m) Prof. (m)

DPL-01

Dynamic Probing Light

SUBSTATION IN INFULENECoordinates (WGS84): DPL-01M = 454463.443 mP = 7137119.094 m Date:

10,0 kg 1,0 m0,5 m 4,20 kg

2,925 kg 0,1 m

Technician: Verified by:

Obs: At 5m depth is observed a light humidityArlindo MaueleleGonçalo Oliveira

Z = 58.43 m 25-01-2017

Hammer mass = Length of drive rods =

Prof: 11.0 mHeight of fall = Avil + guide rod =Weight of drive rods = Unit interval=

Location: Infulene - Maputo

Dynamic Probing Light

SUBSTATION IN INFULENECoordinates (WGS84):

M = 454442.121 mP = 7137123.641 m Date:

DPL-02

0 10 20 30 40 50 600,0

1,0

2,0

3,0

4,0

5,0

6,0

7,0

8,0

9,0

10,0

11,0

DEP

TH (m

)

BLOWS N(10)

0,0

1,0

2,0

3,0

4,0

5,0

6,0

7,0

8,0

9,0

10,0

11,0

0,0 10,0 20,0 30,0

Rd (MPa)

0,0

1,0

2,0

3,0

4,0

5,0

6,0

7,0

8,0

9,0

10,0

11,0

0,0 5,0 10,0 15,0

Qd (MPa)

A-6-20

N(10) Rd (MPa) Qd (MPa) N(10) Rd (MPa) Qd (MPa)

0,0 0,1 8 3,9 2,3 7,6 7,7 25,0 12,1 3,2

0,1 0,2 9 4,3 2,5 7,7 7,8 22,0 10,6 2,8

0,2 0,3 9 4,3 2,5 7,8 7,9 23,0 11,1 3,0

0,3 0,4 9 4,3 2,5 7,9 8,0 23,0 11,1 3,0

0,4 0,5 8 3,9 2,3 8,0 8,1 28,0 13,5 3,3

0,5 0,6 6 2,9 1,7 8,1 8,2 30,0 14,5 3,6

0,6 0,7 5 2,4 1,4 8,2 8,3 26,0 12,5 3,1

0,7 0,8 5 2,4 1,4 8,3 8,4 25,0 12,1 3,0

0,8 0,9 5 2,4 1,4 8,4 8,5 25,0 12,1 3,0

0,9 1,0 4 1,9 1,1 8,5 8,6 25,0 12,1 3,0

1,0 1,1 4 1,9 1,0 8,6 8,7 25,0 12,1 3,0

1,1 1,2 5 2,4 1,2 8,7 8,8 25,0 12,1 3,0

1,2 1,3 5 2,4 1,2 8,8 8,9 25,0 12,1 3,0

1,3 1,4 5 2,4 1,2 8,9 9,0 28,0 13,5 3,3

1,4 1,5 5 2,4 1,2 9,0 9,1 29,0 14,0 3,2

1,5 1,6 5 2,4 1,2 9,1 9,2 28,0 13,5 3,1

1,6 1,7 5 2,4 1,2 9,2 9,3 28,0 13,5 3,1

1,7 1,8 6 2,9 1,4 9,3 9,4 27,0 13,0 3,0

1,8 1,9 6 2,9 1,4 9,4 9,5 28,0 13,5 3,1

1,9 2,0 6 2,9 1,4 9,5 9,6 28,0 13,5 3,1

2,0 2,1 8 3,9 1,7 9,6 9,7 30,0 14,5 3,3

2,1 2,2 8 3,9 1,7 9,7 9,8 31,0 15,0 3,5

2,2 2,3 8 3,9 1,7 9,8 9,9 32,0 15,4 3,6

2,3 2,4 8 3,9 1,7 9,9 10,0 32,0 15,4 3,6

2,4 2,5 8 3,9 1,7 10,0 10,1 33,0 15,9 3,4

2,5 2,6 8 3,9 1,7 10,1 10,2 33,0 15,9 3,4

2,6 2,7 7 3,4 1,5 10,2 10,3 33,0 15,9 3,4

2,7 2,8 7 3,4 1,5 10,3 10,4 35,0 16,9 3,7

2,8 2,9 8 3,9 1,7 10,4 10,5 35,0 16,9 3,7

2,9 3,0 9 4,3 1,9 10,5 10,6 39,0 18,8 4,1

3,0 3,1 10 4,8 1,9 10,6 10,7 46,0 22,2 4,8

3,1 3,2 10 4,8 1,9 10,7 10,8 48,0 23,2 5,0

3,2 3,3 10 4,8 1,9 10,8 10,9 46,0 22,2 4,8

3,3 3,4 10 4,8 1,9 10,9 11,0 42,0 20,3 4,4

3,4 3,5 11 5,3 2,13,5 3,6 10 4,8 1,93,6 3,7 10 4,8 1,93,7 3,8 10 4,8 1,93,8 3,9 10 4,8 1,93,9 4,0 10 4,8 1,94,0 4,1 11 5,3 1,84,1 4,2 11 5,3 1,84,2 4,3 14 6,8 2,34,3 4,4 13 6,3 2,24,4 4,5 14 6,8 2,34,5 4,6 15 7,2 2,54,6 4,7 14 6,8 2,34,7 4,8 14 6,8 2,34,8 4,9 14 6,8 2,34,9 5,0 16 7,7 2,75,0 5,1 17 8,2 2,65,1 5,2 18 8,7 2,75,2 5,3 20 9,6 3,05,3 5,4 20 9,6 3,05,4 5,5 16 7,7 2,45,5 5,6 16 7,7 2,45,6 5,7 16 7,7 2,45,7 5,8 16 7,7 2,45,8 5,9 16 7,7 2,45,9 6,0 16 7,7 2,46,0 6,1 22 10,6 3,16,1 6,2 25 12,1 3,56,2 6,3 25 12,1 3,56,3 6,4 25 12,1 3,56,4 6,5 28 13,5 3,96,5 6,6 26 12,5 3,66,6 6,7 24 11,6 3,36,7 6,8 22 10,6 3,16,8 6,9 21 10,1 2,96,9 7,0 21 10,1 2,97,0 7,1 24 11,6 3,17,1 7,2 24 11,6 3,17,2 7,3 25 12,1 3,27,3 7,4 24 11,6 3,17,4 7,5 24 11,6 3,17,5 7,6 24 11,6 3,1

Technician: Verified by:

P = 7137123.641 m Date:

Prof. (m) Prof. (m)

Obs: At 5m depth is observed a light humidityArlindo MaueleleGonçalo Oliveira

Location: Infulene - Maputo Z = 58.43 m 25-01-2017

DPL-02

Dynamic Probing Light

SUBSTATION IN INFULENECoordinates (WGS84): DPL-02M = 454442.121 m

INFULENE ELECTRICAL SUBSTATION

GEOLOGICAL AND GEOTECHNICAL SURVEY

FINAL REPORT

ANNEX IV – LABORATORY TEST

A-6-21

CC

`C

cC

vqu

quC

C`

φφ `

KE

Eφ

φ `

σ3

σ1

Dir

ect S

hear

Con

solid

atio

nU

ncon

fine

dC

ompr

essi

onT

est

Tri

axia

l Com

pres

sion

Tes

t

BH-

BH BH

7

Iσ `

pi

m

(Kpa

)(K

pa)

(cm

2/s)

(Kpa

)(K

pa)

m

(o)

(o)

e o(c

m/s

)(k

Pa)

(kPa

)(k

Pa)

(kPa

)(

o)

(o)

12676

6,00-6,60

1 2 3

41 13 31

190,35 214,40 212,08

185,11 208,18 206,02

77,56 78,99 80,30

5,24 6,22 6,06

107,55 129,19 125,72

4,9 4,8 4,8

4,8 (0.1%)

Verified by :

This test report can only be reproduced totaly, or partially with Geocontrole express authorization.

REMARKS :

mc Mass of container (0,01g)

25/01/2017

mw+c Mass of wet soil + container (0,01g)

m d+c Mass of dry soil + container (0,01g)

MC=mml/md*100 Moisture content (0,1 %)

MOISTURE CONTENT Mc =

mml=mw+c - md+c Mass of moisture loss (0,01g)

md=md+c - mc Mass of dry soil (0,01g)

Depth (m) :

Specimen number

Container number

Standard method: ASTM D 2216 - 05

Sample Register date : Sample Nº :

5

Date : 25/01/2017 Date :

Tested by :

Page 1 of

Borehole or Pit :Redish brown, silty sandMaterial description :

DETERMINATION OF WATER CONTENT OF SOIL AND ROCK BY MASS

Job :

Job N. : 12117 - Lot 1

GEOTECNHICAL STUDY - INFULENE

BH-1

A-6-22

p1= g

TOTAL ACCUMULATED WEIGHT RETAINED BY SIEVE Nº 10 (g) p2= g

TOTAL WEIGHT OF SAMPLE BELOW SIEVE Nº 10 (g) p3= g

TOTAL WEIGHT USED IN TEST BELOW SIEVE Nº 10 (g) p4= g

100

Hydrometer (151H) nº

Specific gravity of soilCorrection dispersing agentCorrection meniscus

Time(min)

Temp.

( o )

Heigthread. (L)

2 21,0 #N/D

5 21,0 #N/D

15 21,0 #N/D

30 21,0 #N/D

60 21,0 #N/D

250 20,0 #N/D

1440 21,0 #N/D

This test report can only be reproduced totaly, or partially with Geocontrole express authorization.

REMARKS :

JOB : GEOTECNHICAL STUDY - INFULENE

Job N. 12117 - Lot 1

STANDARD TEST METHOD FOR PARTICLE - SIZE ANALYSIS OF SOILSStandard method : ASTM D 6913 & ASTM D 422

0,00

107,58

107,58

Mass accumulated in sieve %Passing

(Referred to the

total weight)

0,840 0,40 0,4 99,63" 75,0 0 0,0 100,0

TOTAL WEIGHT OF SAMPLE (g) 107,58

Material description :

Sample Register date : 25/01/2017

Redish brown, silty sand

Depth (m): 6,00-6,60

nº 20

(ASTM) Mass (g) % Passing (ASTM ) Mass (g) %

Sieve designation Mesh aperture

(mm)

Mass accumulated in sieve % Sieve designation Mesh aperture

(mm)

0,425 10,94 10,2 89,8

64,5

1 1/2" 37,5 0 0,0 100,0

2 1/2" 63,0 0 0,0 100,0 nº 40

nº 100 0,150 87,44 81,3 18,7

nº 140 0,105 91,31 84,9 15,1

2" 50,0 0 0,0 100,0 nº 60 0,250 38,22 35,5

1" 25,0 0 0,0 100,0

1/2" 12,5 0 0,0 100,0

0,075 92,23 85,7 14,33/4" 19,0 0 0,0 100,0 nº 200

nº 4 4,75 0 0,0 100,02,626

3/8" 9,5 0 0,0 100,027

0,0002

Readings (L)Compositecorrection

Reading correctedParticle

diameter (D)

% of particlesreferred to the

total

nº 10 2,00 0,00 0,0 100,00,0010

-0,0013 -0,0025 #N/D -1504,8-0,0013 -0,0025 #N/D -1504,8-0,0013 -0,0025 #N/D -1504,8-0,0013 -0,0025 #N/D -1504,8

-0,0013 -0,0025 #N/D -1504,8

-0,0013 -0,0025 #N/D -1504,8-0,0017 -0,0029 #N/D -1505,4

5

Date : 27/01/2017 Date :

Tested by : Verified by :Page 2 of

635337,526,519,013,29,54,752,000,8400,4250,2500,1050,075

0

10

20

30

40

50

60

70

80

90

100

Pe

rce

nta

ge

Pa

ss

ing

(%

)

Curve Particle Size Distribution

Mesh aperture (mm)

Sample Nº 12676

Borehole or Pit : BH-1

m2 (g)

m3 (g)

m1 (g)

md=m3-m1 (g)

mw=m2-m3 (g)

w=100*mw/md (%)

LL= %

m2 (g)

m3 (g)

m1 (g)

md=m3-m1 (g)

mw=m2-m3 (g)

w=100*mw/md (%)

PL= %

PI=(LL-PL)= - N/P = %

Tested by : Verified by :

Date : Date :This test report can only be reproduced totaly, or partially with Geocontrole express authorization.

Moisture content

Page 3 of 5

30/01/2017

N/P

Plasticity Index

N/P N/P

Mass of dry soil

Mass of moisture loss

Mass of dry soil + container

Mass of container

Plastic Limit

Container n.º

Mass of wet soil + container

N/PNumber of bumps

Mass of moisture loss

Moisture content

Mass of dry soil

Mass of container

Mass of dry soil + container

Mass of wet soil + container

Liquid Limit

Container n.º

LIQUID LIMIT, PLASTIC LIMIT AND PLASTICITY INDEX OF SOILSStandard method: ASTM D 4318

Sample Register date : 25/01/2017 Sample Nº : 12676

JOB : GEOTECNHICAL STUDY - INFULENE

Job N. : 12117 - Lot 1

454647484950515253545556575859606162636465

Mo

istu

re c

on

ten

t (%

)

Number of bumps

Material description : Redish brown, silty sand Borehole or Pit : BH-1

Depth (m): 6,00-6,60

A-6-23

25/01/2017

Redish brown, silty sand

x Method A

Method B

Verified by :

This test report can only be reproduced totaly, or partially with Geocontrole express authorization.

GEOTECNHICAL STUDY - INFULENE

12117 - Lot 1

Standard method: ASTM D854-02

SPECIFIC GRAVITY OF SOIL BY WATER PYCNOMETER

JOB :

Job N.

6,00-6,60Depth (m):

Pycnometer n.º nº 44 55

Test temperature (t) oC 27,0 27,0

Temperature coeficient K 0,99831 0,99831

Pycnometer + sample + distilledwater (g)

Mrws,t 189,38 189,89

Pycnometer + distilled water (g) Mrw,t 173,72 174,19

25,24 25,35

Container nº 12 14

Container mass (g) P1 193,36 186,58

REMARKS:

Specific gravity (g/cm³) Gt 2,635 2,627

Specific gravity at 20ºC (g/cm³) G20ºC 2,630 2,623

Sample Register date :

Material description :

Sample Nº :

Borehole or Pit :

12676

Average (g/cm³) G20ºC 2,626

Mass of the oven dry soil +Container (g)

P2 218,6 211,93

Mass of the oven dry soil (g) Ms

5

Date : 27/01/2017 Date :

Tested by :

Page 4 of

),

(, sMtwsMtwM

sMtG

BH-1

Height specimen (L0) cm Type of sample:

Diameter specimen (D0) cm Water content (w) %(obtained after shear with entire specimen)

Cross-sectional area (A0) cm2( w) kN/m3

Volume specimen (V0) cm3Dry bulk density ( d) kN/m3

Wt. specimen wet (Ww) g Specific gravity (G) g/cm³

Wt. specimen dry (Wd) g Degree of saturation (Sr) %

dial % Div N

00:00 0 0,00 0 0 27,34

00:20 154 0,13 8 25 27,37

00:40 316 0,26 15 47 27,41

01:05 523 0,43 22 70 27,46

01:32 797 0,65 25 79 27,52

01:55 997 0,82 26 82 27,56

02:56 1543 1,26 26 82 27,69

03:50 2010 1,65 25 79 27,80

04:44 2576 2,11 22 70 27,93

05:38 3142 2,58 19 60 28,06

06:32 3708 3,04 16 51 28,20

#N/D

0,42 %/min / 0,51 mm/min

qu= kPa

Su= kPa

Eav= kPa

REMARKS:

Tested by : Verified by :

This test report only can be reproduced totaly, or partially with Geocontrole express authorization. The results are referring to the test sample.

5of5Page

30/01/2017

5500(average modulus)

Strain rate:

29,8

14,9

29,8

29,7

28,4

24,9

21,4

17,9

0,0

9,2

17,3

25,3

28,7

333,54 16,8

597,9

572,09 22

2,626(measured)

6,00-6,60

12,20 Undisturbed

5,90 4,5

27,34 17,6

Sample Register date :

Material description : Borohole nº :

Sample nº :

Date: Date:

GEOTECNHICAL STUDY - INFULENE

Job N.

JOB :

12117 - Lot 1

UNCONFINED COMPRESSIVE STRENGTH OF COHESIVE SOILSStandard method: ASTM D 2166-00

25/01/2017 12676

Time(min:seg)

STRAIN LOAD CORR.AREA

(cm2)

STRESS(kPa)

0,0

4,0

8,0

12,0

16,0

20,0

24,0

28,0

32,0

0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5

Co

mp

res

siv

e s

tre

ss

(k

Pa

)

Axial strain (%)

Stress-Strain Curve

Redish brown, silty sand BH-1

Depth (m):

A-6-24

12677

10,50-11,10

1 2 3

5 29 18

201,27 215,77 217,81

190,61 203,93 205,58

78,69 78,78 79,86

10,66 11,84 12,23

111,92 125,15 125,72

9,5 9,5 9,7

9,6 (0.1%)

Verified by :

This test report can only be reproduced totaly, or partially with Geocontrole express authorization.

Borehole or Pit :Redish brown, silty sandMaterial description :

DETERMINATION OF WATER CONTENT OF SOIL AND ROCK BY MASS

Job :

Job N. : 12117 - Lot 1

GEOTECNHICAL STUDY - INFULENE

12

Date : 25/01/2017 Date :

Tested by :

Page 1 of

mml=mw+c - md+c Mass of moisture loss (0,01g)

md=md+c - mc Mass of dry soil (0,01g)

Depth (m) :

Specimen number

Container number

Standard method: ASTM D 2216 - 05

Sample Register date : Sample Nº :

REMARKS :

mc Mass of container (0,01g)

25/01/2017

mw+c Mass of wet soil + container (0,01g)

m d+c Mass of dry soil + container (0,01g)

MC=mml/md*100 Moisture content (0,1 %)

MOISTURE CONTENT Mc =

BH-1p1= g

TOTAL ACCUMULATED WEIGHT RETAINED BY SIEVE Nº 10 (g) p2= g

TOTAL WEIGHT OF SAMPLE BELOW SIEVE Nº 10 (g) p3= g

TOTAL WEIGHT USED IN TEST BELOW SIEVE Nº 10 (g) p4= g

100

Hydrometer (151H) nº

Specific gravity of soilCorrection dispersing agentCorrection meniscus

Time(min)

Temp.

( o )

Heigthread. (L)

2 21,0 #N/D

5 21,0 #N/D

15 21,0 #N/D

30 21,0 #N/D

60 21,0 #N/D

250 20,0 #N/D

1440 21,0 #N/D

This test report can only be reproduced totaly, or partially with Geocontrole express authorization.

12

Date : 27/01/2017 Date :

Tested by : Verified by :Page 2 of

-0,0013 -0,0025 #N/D -1291,3

-0,0013 -0,0025 #N/D -1291,3-0,0017 -0,0029 #N/D -1291,8

-0,0013 -0,0025 #N/D -1291,3-0,0013 -0,0025 #N/D -1291,3

-0,0013 -0,0025 #N/D -1291,3-0,0013 -0,0025 #N/D -1291,3

0,0002

Readings (L)Compositecorrection

Reading correctedParticle

diameter (D)

% of particlesreferred to the

total

nº 10 2,00 0,00 0,0 100,00,0010

nº 4 4,75 0 0,0 100,02,611

3/8" 9,5 0 0,0 100,027

1/2" 12,5 0 0,0 100,0

0,075 107,10 85,1 14,93/4" 19,0 0 0,0 100,0 nº 200

nº 140 0,105 105,88 84,1 15,9

2" 50,0 0 0,0 100,0 nº 60 0,250 40,67 32,3

1" 25,0 0 0,0 100,0

0,425 11,43 9,1 90,9

67,7

1 1/2" 37,5 0 0,0 100,0

2 1/2" 63,0 0 0,0 100,0 nº 40

nº 100 0,150 99,66 79,2 20,8

nº 20

(ASTM) Mass (g) % Passing (ASTM ) Mass (g) %

Sieve designation Mesh aperture

(mm)

Mass accumulated in sieve % Sieve designation Mesh aperture

(mm)

TOTAL WEIGHT OF SAMPLE (g) 125,83

Material description :

Sample Register date : 25/01/2017

Redish brown, silty sand

Depth (m): 10,50-11,10

REMARKS :

JOB : GEOTECNHICAL STUDY - INFULENE

Job N. 12117 - Lot 1

STANDARD TEST METHOD FOR PARTICLE - SIZE ANALYSIS OF SOILSStandard method : ASTM D 6913 & ASTM D 422

0,00

125,83

125,83

Mass accumulated in sieve %Passing

(Referred to the

total weight)

0,840 0,45 0,4 99,63" 75,0 0 0,0 100,0

635337,526,519,013,29,54,752,000,8400,4250,2500,1050,075

0

10

20

30

40

50

60

70

80

90

100

Pe

rce

nta

ge

Pa

ss

ing

(%

)

Curve Particle Size Distribution

Mesh aperture (mm)

Sample Nº 12677

Borehole or Pit : BH-1

A-6-25

m2 (g)

m3 (g)

m1 (g)

md=m3-m1 (g)

mw=m2-m3 (g)

w=100*mw/md (%)

LL= %

m2 (g)

m3 (g)

m1 (g)

md=m3-m1 (g)

mw=m2-m3 (g)

w=100*mw/md (%)

PL= %

PI=(LL-PL)= - N/P = %

Tested by : Verified by :

Date : Date :This test report can only be reproduced totaly, or partially with Geocontrole express authorization.

LIQUID LIMIT, PLASTIC LIMIT AND PLASTICITY INDEX OF SOILSStandard method: ASTM D 4318

Sample Register date : 25/01/2017 Sample Nº : 12677

JOB : GEOTECNHICAL STUDY - INFULENE

Job N. : 12117 - Lot 1

Liquid Limit

Container n.º

Mass of dry soil + container

Mass of wet soil + container

Mass of dry soil

Mass of container

Mass of moisture loss

Moisture content

N/PNumber of bumps

Plastic Limit

Container n.º

Mass of wet soil + container

Mass of dry soil + container

Mass of container

Mass of dry soil

Mass of moisture loss

Moisture content

Page 3 of 12

30/01/2017

N/P

Plasticity Index

N/P N/P

454647484950515253545556575859606162636465

Mo

istu

re c

on

ten

t (%

)

Number of bumps

Material description : Redish brown, silty sand Borehole or Pit : BH-1

Depth (m): 10,50-11,10

25/01/2017

Redish brown, silty sand

x Method A

Method B

Verified by :

This test report can only be reproduced totaly, or partially with Geocontrole express authorization.

12

Date : 27/01/2017 Date :

Tested by :

Page 4 of

Sample Register date :

Material description :

Sample Nº :

Borehole or Pit :

12677

Average (g/cm³) G20ºC 2,611

Mass of the oven dry soil +Container (g)

P2 212,72 213,22

Mass of the oven dry soil (g) Ms

REMARKS:

Specific gravity (g/cm³) Gt 2,616 2,614

Specific gravity at 20ºC (g/cm³) G20ºC 2,612 2,610

25,11 25,43

Container nº 22 31

Container mass (g) P1 187,61 187,79

Pycnometer + sample + distilledwater (g)

Mrws,t 189,23 189,89

Pycnometer + distilled water (g) Mrw,t 173,72 174,19

Test temperature (t) oC 26,0 26,0

Temperature coeficient K 0,99858 0,99858

10,50-11,10Depth (m):

Pycnometer n.º nº 44 55

GEOTECNHICAL STUDY - INFULENE

12117 - Lot 1

Standard method: ASTM D854-02

SPECIFIC GRAVITY OF SOIL BY WATER PYCNOMETER

JOB :

Job N.

),

(, sMtwsMtwM

sMtG

BH-1

A-6-26

Height specimen (L0) cm Type of sample:

Diameter specimen (D0) cm Water content (w) %(obtained after shear with entire specimen)

Cross-sectional area (A0) cm2( w) kN/m3

Volume specimen (V0) cm3Dry bulk density ( d) kN/m3

Wt. specimen wet (Ww) g Specific gravity (G) g/cm³

Wt. specimen dry (Wd) g Degree of saturation (Sr) %

dial % Div N

00:00 0 0,00 0 0 27,34

00:19 119 0,10 3 9 27,37

00:37 297 0,25 5 16 27,41

01:00 497 0,41 7 22 27,45

01:35 799 0,67 10 32 27,52

02:03 997 0,83 11 35 27,57

03:10 1555 1,30 12 38 27,70

03:57 1950 1,63 12 38 27,79

04:44 2345 1,95 11 35 27,88

05:31 2740 2,28 10 32 27,98

06:18 3135 2,61 8 25 28,07

07:05 3530 2,94 5 16 28,17

#N/D

0,41 %/min / 0,49 mm/min

qu= kPa

Su= kPa

Eav= kPa

REMARKS:

Tested by : Verified by :

This test report only can be reproduced totaly, or partially with Geocontrole express authorization. The results are referring to the test sample.

Date: Date:

GEOTECNHICAL STUDY - INFULENE

Job N.

JOB :

12117 - Lot 1

UNCONFINED COMPRESSIVE STRENGTH OF COHESIVE SOILSStandard method: ASTM D 2166-00

25/01/2017 12677

Time(min:seg)

STRAIN LOAD CORR.AREA

(cm2)

STRESS(kPa)

Sample Register date :

Material description : Borohole nº :

Sample nº :

10,50-11,10

12,00 Undisturbed

5,90 7,2

27,34 18,9

Depth (m):

11,5

328,08 17,6

631,3

588,91 41

2,611(measured)

0,0

3,5

5,8

8,1

12,6

13,7

13,6

12,5

11,3

9,0

5,6

Strain rate:

13,7

6,8

1346(average modulus)

12of5Page

30/01/2017

0,0

4,0

8,0

12,0

16,0

20,0

24,0

0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5

Co

mp

res

siv

e s

tre

ss

(k

Pa

)

Axial strain (%)

Stress-Strain Curve

Redish brown, silty sand BH-1

Mod

.PL.

28/4

13

13

U(

1-3)

/2(

1+3)

/2(

1+3)

/21-

3C

=

2kP

a

214

5022

864

-14

8214

613

216

4=

37O

410

100

432

122

-22

155

277

255

310

C´

=0

kPa

828

200

870

242

-42

314

556

514

628

´ =

34O

1211

7

GE

OT

EC

HN

ICA

L S

TU

DY

- IN

FU

LE

NE

TE

CN

AS

OL

MO

HR

EN

VE

LO

PE

PA

GE

6O

F12

CO

MM

EN

TS

:

CH

EC

K:

y =

0,7

56x

+ 2

y =

0,6

8x

050100

150

200

250

300

350

400

050

100

150

200

250

300

350

400

450

500

550

600

650

700

750

800

850

900

950

1267

7 -

IB

H-0

110

,50-

11,1

012

677

- II

BH

-01

10,5

0-11

,10

1267

7 -

III

BH

-01

10,5

0-11

,10

A-6-27

Heigth H (cm)Diam.F (cm)

Area F(cm2)

VolumeF (cm3)

Total Weigth P(g)

Dry Weigth Ps(g)

11,6 5,9 27,34 317,1 659,8

11,53 5,87 27,02 311,7 725,4

609,5 DATE: 31/01/2017

HOUR CHAMBERPRESSURE

BACK-PRESSURE

CONSOLID.PRESSURE

CHAMBERPRESSURE (kPa) 290 CHAMBER

PRESSURE (kPa)

HH/mm kPa kPa kPa 3

(kPa)READ U

(kPa)U

(kPa)B % BACK-PRESSURE (kPa) 240 BACK-PRESSURE (kPa)

11:20 50 ---

--- --- ---

08:00 50 40 DD/MM/AA hh/mm/ss cm3 DD/MM/AA hh/mm/ss cm3

08:20 90 59 23,4

08:00 90 81 21,2

08:20 131 111 20,1

08:00 130 122 19,5

08:20 171 155 19,1

08:00 171 165 18,9

08:20 210 199 18,7

08:00 210 204 18,6

08:20 250 241 18,5

08:00 250 240 18,4

08:20 291 280 18,2

18,1

18,1

18,0

17,9

17,9

DONED BY: DONED BY:

COMMENTS:

Mod.PL.28.5/6 - 21/5/09

MAN-1

TECNASOL31/01/2017

TYPE OF TEST

Test Conclusion Date

16/02/2017Job : GEOTECHNICAL STUDY - INFULENE

1 - PREPARATION

12677 - I

SampleProcess 12117 LotRua Xavier Matola,362 Unidade C, Cx Postal nº 15-Matola-Maputo-Moçambique Tel.: 25821720402 Fax:

25821720404 e-mail: mail@geocontrole.pt

1

Sample Register DateClient :

TEST REPORTBorehole

Volume metter nº

Lab.005.007

Volume metter nº

Page 7 of 12

Depth

10,50-11,10

30

40 98

2 - SATURATION

SKEMPTON PARAMETER (B)

19

DATE

40 10

END OF CONSOLITION

END OF TEST

31/01/2017

73

01/02/2017 40 10 40

81 9

03/02/2017 122 8 41

41

05/02/2017 204 6 40

04/02/2017 165 6 39

80

34 87

37 93

06/02/2017 240 10 41

33

DONED BY:Pressure metter nº

8/2/17 10:19

HOUR VOLUMEVARIAT.

3 - CONSOLIDATION

DATE HOUR VOLUMEVARIAT. DATE

TYPE OF RUBER:

8/2/17 10:30

8/2/17 10:51

8/2/17 11:42

8/2/17 13:03

8/2/17 16:14

8/2/17 19:25

9/2/17 7:25

9/2/17 13:11

9/2/17 18:57

10/2/17 10:57

13/2/17 7:18

14/2/17 8:02

PREPARATION

8/2/17 10:11

8/2/17 10:12

8/2/17 10:14

PAPER (drain)

48

02/02/2017

CONSOLIDATED-UNDRAINED TRIAXIAL COMPRESSION TEST WITH MEASUREMENT OF PORE PRESSUREBS 1377 - PART 8

CU

Thin

No

CHAMBER Nº 51

0,0

2,0

4,0

6,00:00 0:01 0:14 2:24 24:00 240:00 2400:00 24000:00 240000:00

Vo

lum

e V

ar c

m3

Time

BH-01

BEGINNING OF THE TEST

DIAMETER SPECIMEN (φ) 5,9 cm

HEIGHT SPECIMEN (H0) 11,6 cm

WATER CONTENT (w) 8,2 %

WET SPECIFIC WEIGHT (γ) 20,4 kN/m3

DRY SPECIFIC WEIGHT (γd) 18,8 kN/m3

END OF THE TEST

WATER CONTENT (w) 19,0 %

WET SPECIFIC WEIGHT (γ) 22,8 kN/m3

DRY SPECIFIC WEIGHT (γd) 19,2 kN/m3

SATURATION:

SKEMPTON PARAMETER (B) 97,6 %

CONSOLIDATION:

REDUCED VOLUME (ΔV) 5,5 cm3

STRAIN (ΔH) 0,07 cm

CONSOLIDATION COEFICIENTE (CV) ---

Particle Density 2,611

Time (seg) ΔV

0 0 0,0 1,00 08/02/2017 10:11 23,4

2 35 0,1 1,71 08/02/2017 10:12 21,2

5 54 0,3 2,08 08/02/2017 10:14 20,1

9 68 0,6 2,36 08/02/2017 10:19 19,5

11 82 0,8 2,63 08/02/2017 10:30 19,1

13 104 1,1 3,07 08/02/2017 10:51 18,9

13 114 1,8 3,29 08/02/2017 11:42 18,7

10 126 2,6 3,52 08/02/2017 13:03 18,6

2 137 3,5 3,75 08/02/2017 16:14 18,5

-2 149 4,3 3,97 08/02/2017 19:25 18,4

-6 162 5,3 4,23 09/02/2017 07:25 18,2

-10 164 6,5 4,28 09/02/2017 13:11 18,1

-14 164 8,1 4,29 09/02/2017 18:57 18,1

-18 164 8,9 4,28 10/02/2017 10:57 18,0

-23 162 10,3 4,23 13/02/2017 07:18 17,9

-30 157 11,5 4,14 14/02/2017 08:02 17,9

-32 146 13,5 3,91

00/01/1900 00:00 0,0

00/01/1900 00:00 0,0

Vt100 ---

COMMENTS:

Mod.PL.28/1

This test report only can be reproduced totaly, or partially with Geocontrole express authorization. The results are referring to the test sample.

AXIALstrain

(%)1/ 3

ALTURA = 7.51 cmLARGURA = 10.22 cm

214 kPa

17/fev/17 Page 8 of

-14 kPa

CHECK:

Issue date

Consolidation

- 3 164 kPa

U

VALUES FOR SHEARING PHASE CALCULATION

U(kPa)

1- 3(kPa)

TEST REPORT

1

SPECIMEN CHARACTERISTICPREPARATION / CONSOLIDATION / SATURATION

Rua Xavier Matola,362 Unidade C, Cx Postal nº 15-Matola-Maputo-Moçambique Tel.:25821720402 Fax: 25821720404 e-mail: mail@geocontrole.pt

Sample Register Date

31/01/2017

Test Conclusion DateJob : GEOTECHNICAL STUDY - INFULENE

Borehole

Process 12117 LotSample

12677 - I

Client : TECNASOLDepth

10,50-11,1016/02/2017

RUPTURE SCHEME

TRIAXIAL TEST"CU" TEST

BS 1377

WITH PORE PRESSURE MEASURE

If r

equ

ired

th

is p

ho

to c

an b

e se

nt

by

e-m

ail

DONE BY:

12

228 kPa

CONSIDERED VALUES IN RUPTURE

64 kPa

50 kPa

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

160

170

180

0,0 5,0 10,0 15,0 20,0 25,0

1-3

(kP

a)

Axial Strain (%)

1/3

-36-34-32-30-28-26-24-22-20-18-16-14-12-10

-8-6-4-202468

10121416

0,0 5,0 10,0 15,0 20,0 25,0

Axial Strain (%)

u

(k

Pa

)

BH-01

A-6-28

Heigth H (cm)Diam.F (cm)

Area F(cm2)

VolumeF (cm3)

Total Weigth P(g)

Dry Weigth Ps(g)

11,5 5,9 27,34 314,4 625,4

11,41 5,85 26,90 306,8 682,2

575,9 DATE: 31/01/2017

HOUR CHAMBERPRESSURE

BACK-PRESSURE

CONSOLID.PRESSURE

CHAMBERPRESSURE (kPa) 340 CHAMBER

PRESSURE (kPa)

HH/mm kPa kPa kPa 3

(kPa)READ U

(kPa)U

(kPa)B % BACK-PRESSURE (kPa) 240 BACK-PRESSURE (kPa)

11:50 50 ---

--- --- ---

08:20 50 40 DD/MM/AA hh/mm/ss cm3 DD/MM/AA hh/mm/ss cm3

08:40 90 60 36,5

08:20 91 81 39,1

08:40 131 112 41,0

08:20 130 122 41,6

08:40 170 154 41,9

08:20 171 165 42,2

08:40 211 198 42,4

08:20 210 204 42,6

08:40 250 241 42,8

08:20 250 240 42,9

08:40 290 280 43,2

43,3

43,4

43,6

44,0

44,1

44,1

DONED BY: DONED BY:

COMMENTS:

Mod.PL.28.5/6 - 21/5/09

CHAMBER Nº 52

PAPER (drain)

50

02/02/2017 78

01/02/2017 40 10

81

15/2/17 8:15

9/2/17 18:57

10/2/17 10:57

13/2/17 7:18

14/2/17 8:02

8/2/17 16:14

8/2/17 19:25

9/2/17 7:25

9/2/17 13:11

8/2/17 10:51

8/2/17 11:42

8/2/17 13:03

8/2/17 10:19

HOUR

8/2/17 10:12

VOLUMEVARIAT.

3 - CONSOLIDATION

DATE HOUR VOLUMEVARIAT. DATE

06/02/2017 240 10 40

80

33 83

40 100

37 93

04/02/2017 165 6 40

05/02/2017 204 6 40

8/2/17 10:1120

03/02/2017 122 8 40 328/2/17 10:30

8/2/17 10:1410 40 31

Depth

10,50-11,10Test Conclusion Date

16/02/2017

Page 9 of 12

TEST REPORTBorehole

12677 - II

Sample12117 Lot 1

SKEMPTON PARAMETER (B)

Volume metter nº

Lab.005.006

Volume metter nº

Process

END OF CONSOLITION

END OF TEST

31/01/2017

Rua Xavier Matola,362 Unidade C, Cx Postal nº 15-Matola-Maputo-Moçambique Tel.: 25821720402 Fax:25821720404 e-mail: mail@geocontrole.pt

Sample Register DateClient : TECNASOL

31/01/2017

40

Job : GEOTECHNICAL STUDY - INFULENE

1 - PREPARATION

TYPE OF RUBER:

TYPE OF TEST

PREPARATION

CONSOLIDATED-UNDRAINED TRIAXIAL COMPRESSION TEST WITH MEASUREMENT OF PORE PRESSUREBS 1377 - PART 8

CU

Thin

No

Pressure metter nº

MAN-1

DATE

40 10

DONED BY:

2 - SATURATION

0,0

5,0

10,00:00 0:01 0:14 2:24 24:00 240:00

Var

.Vo

lum

e cm

3

Tempo

BH-01

BEGINNING OF THE TEST

DIAMETER SPECIMEN (φ) 5,90 cm

HEIGHT SPECIMEN (H0) 11,50 cm

WATER CONTENT (w) 8,6 %

WET SPECIFIC WEIGHT (γ) 19,5 kN/m3

DRY SPECIFIC WEIGHT (γd) 18,0 kN/m3

END OF THE TEST

WATER CONTENT (w) 18,5 %

WET SPECIFIC WEIGHT (γ) 21,8 kN/m3

DRY SPECIFIC WEIGHT (γd) 18,4 kN/m3

SATURATION:

SKEMPTON PARAMETER (B) 100 %

CONSOLIDATION:

REDUCED VOLUME (ΔV) 7,6 cm3

STRAIN (ΔH) 0,09 cm

CONSOLIDATION COEFICIENTE (CV) ---

Particle Density ---

Time (seg) ΔV

0 0 0,0 1,00 08/02/2017 10:11 36,5

4 58 0,1 1,58 08/02/2017 10:12 39,1

6 130 0,3 2,30 08/02/2017 10:14 41,0

8 167 0,6 2,67 08/02/2017 10:19 41,6

10 205 0,8 3,05 08/02/2017 10:30 41,9

11 235 1,2 3,35 08/02/2017 10:51 42,2

12 266 1,9 3,66 08/02/2017 11:42 42,4

8 282 2,5 3,82 08/02/2017 13:03 42,6

2 296 3,2 3,96 08/02/2017 16:14 42,8

-4 303 4,3 4,03 08/02/2017 19:25 42,9

-12 307 5,5 4,07 09/02/2017 07:25 43,2

-17 310 6,6 4,10 09/02/2017 13:11 43,3

-22 310 8,0 4,10 09/02/2017 18:57 43,4

-26 308 9,0 4,08 10/02/2017 10:57 43,6

-30 304 10,3 4,04 13/02/2017 07:18 44,0

-38 301 11,6 4,01 14/02/2017 08:02 44,1

-45 281 13,7 3,81 15/02/2017 08:15 44,1

-50 242 16,0 3,42

Vt100 ---

COMMENTS:

Mod.PL.28/1

This test report only can be reproduced totaly, or partially with Geocontrole express authorization. The results are referring to the test sample.

If r

equ

ired

th

is p

ho

to c

an b

e se

nt

by

e-m

ail

DONE BY:

Issue date Page 10 of

Consolidation

100

- 3

kPa U

TRIAXIAL TEST"CU" TEST

BS 1377

WITH PORE PRESSURE MEASURE

310 kPa

Depth

GEOTECHNICAL STUDY - INFULENE 10,50-11,1016/02/2017

RUPTURE SCHEME

Test Conclusion DateJob :

Borehole

Process 12117 LotSample

12677 - II

Client : TECNASOL

VALUES FOR SHEARING PHASE CALCULATION

U(kPa)

-22 kPa

TEST REPORT

1Rua Xavier Matola,362 Unidade C, Cx Postal nº 15-Matola-Maputo-Moçambique Tel.:25821720402 Fax: 25821720404 e-mail: mail@geocontrole.pt

Sample Register Date

31/01/2017

1- 3(kPa)

AXIALstrain

(%)1/ 3

ALTURA = 7.51 cmLARGURA = 10.22 cm

SPECIMEN CHARACTERISTICPREPARATION / CONSOLIDATION / SATURATION

CONSIDERED VALUES IN RUPTURE

122 kPa

410 kPa

17/fev/17

432 kPa

CHECK:

12

0

50

100

150

200

250

300

350

0,0 5,0 10,0 15,0 20,0 25,0

1-3

(kP

a)

Axial Strain (%)

1/3

-54-52-50-48-46-44-42-40-38-36-34-32-30-28-26-24-22-20-18-16-14-12-10

-8-6-4-202468

10121416

0,0 5,0 10,0 15,0 20,0 25,0

Axial Strain (%)

u

(k

Pa

)

BH-01

A-6-29

Heigth H (cm)Diam.F (cm)

Area F(cm2)

VolumeF (cm3)

Total Weigth P(g)

Dry Weigth Ps(g)

11,5 5,9 27,34 314,4 614,1

11,41 5,85 26,90 306,8 664,5

567,1 DATE: 31/01/2017

HOUR CHAMBERPRESSURE

BACK-PRESSURE

CONSOLID.PRESSURE

CHAMBERPRESSURE (kPa) 440 CHAMBER

PRESSURE (kPa)

HH/mm kPa kPa kPa 3

(kPa)READ U

(kPa)U

(kPa)B % BACK-PRESSURE (kPa) 240 BACK-PRESSURE (kPa)

12:45 50 ---

--- --- ---

08:40 51 40 DD/MM/AA hh/mm/ss cm3 DD/MM/AA hh/mm/ss cm3

09:00 90 61 5,5

08:40 91 81 6,9

09:00 130 114 8,8

08:40 130 122 10,1

09:00 170 157 10,8

08:40 170 165 11,8

09:00 211 202 12,7

08:40 210 204 13,5

09:00 249 240 14,0

08:40 250 240 14,5

09:00 291 279 15,2

15,4

15,6

15,8

16,4

16,5

16,5

DONED BY: DONED BY:

COMMENTS:

Mod.PL.28.5/6 - 21/5/09

MAN-1

TECNASOL31/01/2017

TYPE OF TEST

Test Conclusion Date

16/02/2017Job : GEOTECHNICAL STUDY - INFULENE

1 - PREPARATION

12677 - III

SampleProcess 12117 LotRua Xavier Matola,362 Unidade C, Cx Postal nº 15-Matola-Maputo-Moçambique Tel.: 25821720402 Fax:

25821720404 e-mail: mail@geocontrole.pt

1

Sample Register DateClient :

TEST REPORTBorehole

Volume metter nº

Lab.005.007

Volume metter nº

Page 11 of 12

Depth

10,50-11,10

33

39 95

2 - SATURATION

SKEMPTON PARAMETER (B)

21

DATE

40 10

END OF CONSOLITION

END OF TEST

31/01/2017

85

01/02/2017 40 11 39

81 10

03/02/2017 122 8 40

39

05/02/2017 204 6 39

04/02/2017 165 5 41

88

37 90

36 92

06/02/2017 240 10 41

35

DONED BY:Pressure metter nº

8/2/17 10:19

HOUR VOLUMEVARIAT.

3 - CONSOLIDATION

DATE HOUR VOLUMEVARIAT. DATE

TYPE OF RUBER:

8/2/17 10:30

8/2/17 10:51

8/2/17 11:42

8/2/17 13:03

8/2/17 16:14

8/2/17 19:25

9/2/17 7:25

9/2/17 13:11

9/2/17 18:57

10/2/17 10:57

13/2/17 7:18

14/2/17 8:02

15/2/17 8:10

PREPARATION

8/2/17 10:11

8/2/17 10:12

8/2/17 10:14

PAPER (drain)

54

02/02/2017

CONSOLIDATED-UNDRAINED TRIAXIAL COMPRESSION TEST WITH MEASUREMENT OF PORE PRESSUREBS 1377 - PART 8

CU

Thin

No

CHAMBER Nº 53

0,0

5,0

10,0

15,00:00 0:01 0:14 2:24 24:00 240:00

Var

.Vo

lum

e cm

3

Tempo

BH-01

BEGINNING OF THE TEST

DIAMETER SPECIMEN (φ) 5,90 cm

HEIGHT SPECIMEN (H0) 11,50 cm

WATER CONTENT (w) 8,3 %

WET SPECIFIC WEIGHT (γ) 19,1 kN/m3

DRY SPECIFIC WEIGHT (γd) 17,7 kN/m3

END OF THE TEST

WATER CONTENT (w) 17,2 %

WET SPECIFIC WEIGHT (γ) 21,5 kN/m3

DRY SPECIFIC WEIGHT (γd) 18,3 kN/m3

SATURATION:

SKEMPTON PARAMETER (B) 95,1 %

CONSOLIDATION:

REDUCED VOLUME (ΔV) 11 cm3

STRAIN (ΔH) 0,13 cm

CONSOLIDATION COEFICIENTE (CV) ---

Particle Density ---

Time (seg) ΔV

0 0 0,0 1,00 08/02/2017 10:11 5,5

4 83 0,1 1,42 08/02/2017 10:12 6,9

6 170 0,3 1,85 08/02/2017 10:14 8,8

7 244 0,5 2,22 08/02/2017 10:19 10,1

6 282 0,8 2,41 08/02/2017 10:30 10,8

3 332 1,2 2,66 08/02/2017 10:51 11,8

-4 391 1,9 2,96 08/02/2017 11:42 12,7

-7 429 2,6 3,15 08/02/2017 13:03 13,5

-13 473 3,3 3,37 08/02/2017 16:14 14,0

-23 525 4,4 3,62 08/02/2017 19:25 14,5

-30 564 5,5 3,82 09/02/2017 07:25 15,2

-36 601 6,7 4,01 09/02/2017 13:11 15,4

-42 628 8,1 4,14 09/02/2017 18:57 15,6

-47 622 9,2 4,11 10/02/2017 10:57 15,8

-51 612 10,5 4,06 13/02/2017 07:18 16,4

-52 598 11,6 3,99 14/02/2017 08:02 16,5

-54 556 13,8 3,78 15/02/2017 08:10 16,5

-56 519 16,5 3,60

Vt100

COMMENTS:

Mod.PL.28/1

This test report only can be reproduced totaly, or partially with Geocontrole express authorization. The results are referring to the test sample.

If r

equ

ired

th

is p

ho

to c

an b

e se

nt

by

e-m

ail

DONE BY:

Issue date Page 12 of

Consolidation

200

- 3

kPa U

TRIAXIAL TEST"CU" TEST

BS 1377

WITH PORE PRESSURE MEASURE

628 kPa

Depth

GEOTECHNICAL STUDY - INFULENE 10,50-11,1016/02/2017

RUPTURE SCHEME

Test Conclusion DateJob :

Borehole

Process 12117 LotSample

12677 - III

Client : TECNASOL

VALUES FOR SHEARING PHASE CALCULATION

U(kPa)

-42 kPa

TEST REPORT

1Rua Xavier Matola,362 Unidade C, Cx Postal nº 15-Matola-Maputo-Moçambique Tel.:25821720402 Fax: 25821720404 e-mail: mail@geocontrole.pt

Sample Register Date

31/01/2017

1- 3(kPa)

AXIALstrain

(%)1/ 3

ALTURA = 7.51 cmLARGURA = 10.22 cm

SPECIMEN CHARACTERISTICPREPARATION / CONSOLIDATION / SATURATION

CONSIDERED VALUES IN RUPTURE

242 kPa

828 kPa

17/fev/17

870 kPa

CHECK:

12

0

100

200

300

400

500

600

700

0,0 5,0 10,0 15,0 20,0 25,0

1-3

(kP

a)

Axial Strain (%)

1/3

-60

-55

-50

-45

-40

-35

-30

-25

-20

-15

-10

-5

0

5

10

15

0,0 5,0 10,0 15,0 20,0 25,0

Axial Strain (%)

u

(k

Pa

)

BH-01

A-6-30

12678

18,00-18,60

1 2 3

19 22 36

218,01 229,16 246,69

200,67 209,78 226,07

78,20 79,94 90,20

17,34 19,38 20,62

122,47 129,84 135,87

14,2 14,9 15,2

14,8 (0.1%)

Verified by :

This test report can only be reproduced totaly, or partially with Geocontrole express authorization.

REMARKS :

mc Mass of container (0,01g)

25/01/2017

mw+c Mass of wet soil + container (0,01g)

m d+c Mass of dry soil + container (0,01g)

MC=mml/md*100 Moisture content (0,1 %)

MOISTURE CONTENT Mc =

mml=mw+c - md+c Mass of moisture loss (0,01g)

md=md+c - mc Mass of dry soil (0,01g)

Depth (m) :

Specimen number

Container number

Standard method: ASTM D 2216 - 05

Sample Register date : Sample Nº :

5

Date : 25/01/2017 Date :

Tested by :

Page 1 of

Borehole or Pit :Redish brown, clayey-silty sandMaterial description :

DETERMINATION OF WATER CONTENT OF SOIL AND ROCK BY MASS

Job :

Job N. : 12117 - Lot 1

GEOTECNHICAL STUDY - INFULENE

BH-1p1= g

TOTAL ACCUMULATED WEIGHT RETAINED BY SIEVE Nº 10 (g) p2= g

TOTAL WEIGHT OF SAMPLE BELOW SIEVE Nº 10 (g) p3= g

TOTAL WEIGHT USED IN TEST BELOW SIEVE Nº 10 (g) p4= g

100

Hydrometer (151H) nº

Specific gravity of soilCorrection dispersing agentCorrection meniscus

Time(min)

Temp.

( o )

Heigthread. (L)

2 21,0 #N/D

5 21,0 #N/D

15 21,0 #N/D

30 21,0 #N/D

60 21,0 #N/D

250 20,0 #N/D

1440 21,0 #N/D

This test report can only be reproduced totaly, or partially with Geocontrole express authorization.

REMARKS :

JOB : GEOTECNHICAL STUDY - INFULENE

Job N. 12117 - Lot 1

STANDARD TEST METHOD FOR PARTICLE - SIZE ANALYSIS OF SOILSStandard method : ASTM D 6913 & ASTM D 422

0,00

122,32

122,32

Mass accumulated in sieve %Passing

(Referred to the

total weight)

0,840 0,55 0,4 99,63" 75,0 0 0,0 100,0

TOTAL WEIGHT OF SAMPLE (g) 122,32

Material description :

Sample Register date : 25/01/2017

Redish brown, clayey-silty sand

Depth (m): 18,00-18,60

nº 20

(ASTM) Mass (g) % Passing (ASTM ) Mass (g) %

Sieve designation Mesh aperture

(mm)

Mass accumulated in sieve % Sieve designation Mesh aperture

(mm)

0,425 9,23 7,5 92,5

67,9

1 1/2" 37,5 0 0,0 100,0

2 1/2" 63,0 0 0,0 100,0 nº 40

nº 100 0,150 90,64 74,1 25,9

nº 140 0,105 95,29 77,9 22,1

2" 50,0 0 0,0 100,0 nº 60 0,250 39,30 32,1

1" 25,0 0 0,0 100,0

1/2" 12,5 0 0,0 100,0

0,075 96,86 79,2 20,83/4" 19,0 0 0,0 100,0 nº 200

nº 4 4,75 0 0,0 100,02,590

3/8" 9,5 0 0,0 100,027

0,0002

Readings (L)Compositecorrection

Reading correctedParticle

diameter (D)

% of particlesreferred to the

total

nº 10 2,00 0,00 0,0 100,00,0010

-0,0013 -0,0025 #N/D -1335,0-0,0013 -0,0025 #N/D -1335,0-0,0013 -0,0025 #N/D -1335,0-0,0013 -0,0025 #N/D -1335,0

-0,0013 -0,0025 #N/D -1335,0

-0,0013 -0,0025 #N/D -1335,0-0,0017 -0,0029 #N/D -1335,6

5

Date : 27/01/2017 Date :

Tested by : Verified by :Page 2 of

635337,526,519,013,29,54,752,000,8400,4250,2500,1050,075

0

10

20

30

40

50

60

70

80

90

100

Pe

rce

nta

ge

Pa

ss

ing

(%

)

Curve Particle Size Distribution

Mesh aperture (mm)

Sample Nº 12678

Borehole or Pit : BH-1

A-6-31

m2 (g)

m3 (g)

m1 (g)

md=m3-m1 (g)

mw=m2-m3 (g)

w=100*mw/md (%)

LL= %

m2 (g)

m3 (g)

m1 (g)

md=m3-m1 (g)

mw=m2-m3 (g)

w=100*mw/md (%)

PL= %

Wet preparation / Method A - multipoit test

PI=(LL-PL)= - 15,3 = %

Tested by : Verified by :

Date : Date :This test report can only be reproduced totaly, or partially with Geocontrole express authorization.

JOB :

Job N. : 12117 - Lot 1

GEOTECNHICAL STUDY - INFULENE

LIQUID LIMIT, PLASTIC LIMIT AND PLASTICITY INDEX OF SOILSStandard method: ASTM D 4318

Sample Register date : 25/01/2017 Sample Nº : 12678

Redish brown, clayey-silty sand

Mass of wet soil + container 14,31 13,20 14,58 13,01

Liquid Limit

Container n.º 492 73 496 217

Mass of dry soil 4,7 5,1 5,0 5,0

Mass of dry soil + container 13,23 12,13 13,59 12,08

Mass of container 8,52 7,01 8,56 7,10

Mass of moisture loss 1,1 1,1 1,0 0,9

Moisture content 22,9 20,9 19,7 18,7

19,9Number of bumps 12 19 27 34

Plastic Limit

Container n.º 213 212 211 215

Mass of container 6,94 6,90 6,97 7,03

2,2 2,1 2,1

Mass of moisture loss 0,3 0,3 0,3 0,3

Mass of wet soil + container 9,28 9,38 9,39 9,43

Mass of dry soil + container 8,97 9,05 9,08 9,10

REMARKS :

Moisture content 15,3 15,3 14,7 15,9

Page 3 of 5

31/01/2017

15,3

Plasticity Index

19,9 4,6

Mass of dry soil 2,0

12 19 27 34

15

16

17

18

19

20

21

22

23

24

25

Mo

istu

re c

on

ten

t (%

)

Number of bumps

Material description : Borehole or Pit : BH-1

Depth (m): 18,00-18,60

25/01/2017

Redish brown, clayey-silty sand

x Method A

Method B

Verified by :

This test report can only be reproduced totaly, or partially with Geocontrole express authorization.

GEOTECNHICAL STUDY - INFULENE

12117 - Lot 1

Standard method: ASTM D854-02

SPECIFIC GRAVITY OF SOIL BY WATER PYCNOMETER

JOB :

Job N.

18,00-18,60Depth (m):

Pycnometer n.º nº 3 82

Test temperature (t) oC 27,0 27,0

Temperature coeficient K 0,99831 0,99831

Pycnometer + sample + distilledwater (g)

Mrws,t 159,19 157,61

Pycnometer + distilled water (g) Mrw,t 143,88 142,26

24,89 25,00

Container nº 61 23

Container mass (g) P1 188,30 175,84

REMARKS:

Specific gravity (g/cm³) Gt 2,598 2,591

Specific gravity at 20ºC (g/cm³) G20ºC 2,594 2,586

Sample Register date :

Material description :

Sample Nº :

Borehole or Pit :

12678

Average (g/cm³) G20ºC 2,590

Mass of the oven dry soil +Container (g)

P2 213,19 200,84

Mass of the oven dry soil (g) Ms

5

Date : 30/01/2017 Date :

Tested by :

Page 4 of

),

(, sMtwsMtwM

sMtG

BH-1

A-6-32

Redish brown, clayey-silty sand

Height specimen (L0) cm Type of sample:

Diameter specimen (D0) cm Water content (w) %(obtained after shear with entire specimen)

Cross-sectional area (A0) cm2( w) kN/m3

Volume specimen (V0) cm3Dry bulk density ( d) kN/m3

Wt. specimen wet (Ww) g Specific gravity (G) g/cm³

Wt. specimen dry (Wd) g Degree of saturation (Sr) %

dial % Div N

00:00 0 0,00 0 0 27,34

00:15 130 0,11 4 13 27,37

00:31 268 0,22 5 16 27,40

00:56 497 0,41 7 22 27,45

01:29 799 0,66 10 32 27,52

02:00 997 0,83 12 38 27,57

02:54 1575 1,31 15 47 27,70

03:47 2017 1,68 16 51 27,81

04:44 2655 2,21 17 54 27,96

06:35 3597 2,99 17 54 28,18

07:30 3988 3,32 17 54 28,28

07:49 4257 3,54 17 54 28,34

08:10 4426 3,68 17 54 28,38

08:44 4680 3,89 16 51 28,45

11:00 5789 4,82 12 38 28,72

11:55 6315 5,25 10 32 28,86

#N/D

0,41 %/min / 0,50 mm/min

qu= kPa

Su= kPa

Eav= kPa

REMARKS:

Tested by : Verified by :

This test report only can be reproduced totaly, or partially with Geocontrole express authorization. The results are referring to the test sample.

5of5Page

30/01/2017

1323(average modulus)

Strain rate:

19,2

9,6

13,8

17,1

18,2

19,2

19,1

19,0

19,0

18,9

17,8

13,2

11,0

0,0

4,6

5,8

8,1

11,5

328,62 19,1

740,68

641,32 123

2,590(measured)

18,00-18,60

12,02 Undisturbed

5,90 15,5

27,34 22,1

Sample Register date :

Material description : Borohole nº :

Sample nº :

Date: Date:

GEOTECNHICAL STUDY - INFULENE

Job N.

JOB :

12117 - Lot 1

UNCONFINED COMPRESSIVE STRENGTH OF COHESIVE SOILSStandard method: ASTM D 2166-00

25/01/2017 12678

Time(min:seg)

STRAIN LOAD CORR.AREA

(cm2)

STRESS(kPa)

0,0

4,0

8,0

12,0

16,0

20,0

24,0

0,0 1,0 2,0 3,0 4,0 5,0 6,0

Co

mp

res

siv

e s

tre

ss

(k

Pa

)

Axial strain (%)

Stress-Strain Curve

BH-1

Depth (m):

INFULENE ELECTRICAL SUBSTATION

GEOLOGICAL AND GEOTECHNICAL SURVEY

FINAL REPORT

ANNEX V – BOREHOLE LOCATION PLAN AND INTERPRETATIVE CROSS-SECTION

A-6-33

A-6-34

A-7 Transportation Route

of Mobile Substation

to Matola Gare Substation

Transportation Route of Mobile Substation（Maputo Port - Matola Gare Substation）

(1) Maximum Gradient: 7.8%

(2) Gradient: 5.6%

Width: About 9m Slightly gentle curve

(1) (2) (3)

Port

Width: About 12m Angle: About 90°

Width: About 11m Angle: About 90°

Width: About 14m Angle: About 80°

Width: About 16m Angle: About 90°

The final 370-meter road is unpaved

Width: About 5m Slightly gentle curve

(3) Gradient: -7.2%

Width: About 8m Slightly sharp curve

Matola Gare Substation

7. Transportation R

oute of Mobile S

ubstation to Matola G

are Substation

A-7-1