I.€¦ · possible to replace them for the presentation of the protocol or report executed ......

Lot A: Transmission Line for Kenya-Uganda Power Interconnection (Lessos – Uganda Border)

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I. ADDENDUM

i. Extension of Closing Date

KETRACO wishes to inform bidders that the closing date has been extended to Friday

23rd November 2012 at 10:00am Kenya local time and bids will be opened immediately

thereafter at KETRACO offices.

The tender security bond should therefore be for 120 days from the closing date

Requests for clarification must be received no later than twenty eight (28 days), prior to

deadline for submission of Bids

ii. Revised sections of the bid document

KETRACO wishes to bring to the attention of bidders, changes and additions to sections

of the document. The revised sections attached are listed below and are also available

for downloading from KETRACO’s website:

1. Civil Works (TS4).

2. New Fence and Gate Drawing – 0522011-LSUK-013;

Consequently, the drawing list has been extended to include the following entry:

11. Kenya – Uganda Interconnection

Lessos 220/132 kV Substation

New Fence and Gate

0522011-LSUK-013

3. Price Schedules.

4. Substation Lessos Substation Typical Cross-Section

5. Lessos Substation Typical Cross-Section

iii. Part 2- Employer’s Requirements, section GTS-1 “General Description of the

Project and Extend of Works”, item 1.1 Introduction, bullet no.8 has been

amended and should read as follows:

The existing Turkwell 220 kV line bay shall be used as the first incoming line bay from Kisumu substation. The existing lightning arresters, capacitive voltage transformers and line traps shall be removed and replaced with new equipment to be installed on a new line bay. The line bay shall be completed with the supply and installation of the necessary equipment.

iv. Part 2- Employer’s Requirement, section TS-1 Scope of Supply, item 2.4 (page 11)

has been amended and should read as follows:

1.1 REMOTE CONTROL PANELS

The existing remote control panel for the 220 kV section installed at Lessos substation for the two existing 220/132/11 kV autotransformer bays and the existing Turkwell 220 kV incoming line bay cannot be further extended. For this reason the Contractor shall:


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Dismantle the existing Turkwell 220 kV incoming line control panels, supply and install a new remote control panels and incorporate them in the new remote control panel lineup for the 220 kV section in the New Control Room.

New control panels for the two (2) newly added autotransformers shall be installed next to control panels of the existing autotransformers in the Existing Control Building.

In the Existing Control Building, use the space left by the dismantling of existing Turkwell 220 kV incoming line control panels for installation of the new remote control panels for the newly added 132 kV sections.

Existing control panels shall be then dismantled following commissioning of the new control panels. In order to minimize power interruption during interconnection works, the Contractor is required to develop construction methodology, shutdown sequences, shut down schedules and obtained approval from the Employer. The Contractor is required to study the control and protection system and familiarize himself thoroughly with the operation system of the Employer for above-mentioned works. The Employer will assist the Contractor in obtaining necessary information and permission.

The remote control panel lineup for 220 kV section shall be provided with sufficient panels for installation of controls for:

- Two (2) incoming line from Tororo;

- One (1) outgoing line to Turkwell (existing line relocated);

- Two (2) Line Shunt reactors;

- Two (2) incoming line from Olkaria;

- Two (2) incoming line from Kisumu line control systems;

- One (1) empty panel for future expansion.

Each control panel to be installed in the control room shall be made of steel sheet and suitable for floor mounting, accommodating all items to complete the control functions.


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II. CLARIFICATIONS SOUGHT BY PROSPECTIVE BIDDERS

No Clause/Paragraph/Item No. Clarification/Query Response

1 General Technical Requirements (GTS-3)

1.3.3 Service Conditions It say Altitude 1600 meters above sea level 1600 m.a.s.l. (Meter above sea level). According to our location in Google Earth, the altitude is 2,146 m.a.s.l. Also it is the same in the guaranteed characteristics.

The altitude to be used is 2200 meters a.s.l

2 General Technical Requirements (GTS-3)

1.20.1 Packing of material It say that the biggest package or crate must be with the following maximum limits:

- Weight: 60 ton. - Width: 2.5 m. - Length: 12.0 m. - Height: 5.0 m.

The maximum axle loading shall be obtained from the relevant Authority. We are understanding that the power transformers and reactors don’t have to exceed the exacts dimensions and weight. Please, confirm. Please, confirm

Exception can be made for Autotransformers and Reactors for maximum limits

3 Detailed Requirements (TS-2) 2.2 BUS-BARS AND CONNECTORS, 2.2.1 General, Electrical Characteristics: We are understanding that it is necessary to keep the external insulation levels indicated for 220 and 132 kV switchyards for the installation height, that means, 2146 meter above sea level

Insulation coordination study will be carried out for analyzing Lessos Substation at altitude 2200 meter above sea level and the proposed 400 kV line.

4 Detailed Requirements (TS-2) 2.2 BUS-BARS AND CONNECTORS, 2.2.1 General, Electrical Characteristics: Related to the 31 mm/kV specific leak line. All the external insulations must be maintained, that means, the insulation supports, the insulators chains and porcelains of high voltage equipment taking as a reference the maximum insulation voltage according to IEC. Please, confirm our understanding is OK.

For Lessos substation, we recommended that a IEC, Class II, Medium creepage distance of 20 mm/kV would be sufficient.

5 Detailed Requirements (TS-2) 2.2 BUS-BARS AND CONNECTORS, 2.2.1 General, Electrical Characteristics: Related with the specific 31, 5 KA short circuit level. Please, indicate if this level is in 1 or 3 seconds.

Rated short-circuit is 31.5 kA for 1 second.

6 Detailed Requirements (TS-2) 2.5.13 Test: a) Type test: For Circuit breakers. Please, indicate if the realization of the indicate type test must be included or if it is

Type test may be waived if certificates of test performed in identical equipment are available


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possible to replace them for the presentation of the protocol or report executed in the last 10 years or how long before, about the circuit breaker . Please, clarify the parameter that have to have the executed test in order to be considered in the same type of circuit breaker.

and acceptable to the engineer.

7 Detailed Requirements (TS-2) 2.6.4; 2.7.5; 2.8.6 and 2.9.4 Test: a) Type test: For Disconnectors; current and voltage transformers and lightning arresters type test. Please, indicate if the realization of the indicated type test must be included or if it is possible to replace them for the presentation of the protocols executed in the last 10 years or how long before, about the equipment of the same type. Please, clarify the parameter that have to have the executed test in order to be considered in the same type of Equipment included in the offer.

Refer to Item 6.

8 Detailed Requirements (TS-2) 2.11 11 kV SWITCHBOARDS, 2.11.4.12 Type test and routine test: For 11 kV Switchboards. Please, indicate if the realization of the indicated type test must be included or if it is possible to replace them for the presentation of the protocols executed in the last 10 years or how long before, about the Metal-clad switchboard 11 kV of the same type.

Refer to Item 6.

9 Detailed Requirements (TS-2) 2.24.1 Power Transformer, 2.24.1.1 Related with the 31, 5 KA specific short circuit level. Please, indicate if this level is in 1 or 3 seconds.

Refer to Item 5.

10 Detailed Requirements (TS-2) 2.24.2.1.10Power Transformer, Terminal Bushing Related with the indicated insulation levels. Please, confirm if these levels have to be at the same installation height, that is, 2146 m.a.s.l.

Refer to Item 1. Autotransformers will be installed at altitude 2,200 meters a.s.l, bushings must be sized by the Contractor to meet the minimum requirements specified in 2.24.2.1.10 of the Detailed Technical Requirements (TS-2).

11 Drawings (TS-5) Drawing number 0522011-LSUK-006. 220 kV Switchgear elevations We are surprised about the indicated levels as for the interconnecting between equipments as for the Bus-Bars conductors or aluminum tubes and high laying conductors. Could you please send us the same drawings but “as built”?

It is the bidder’s responsibility to establish the existing design available during the pre-bid site visits. See also TS-1 paragraph 1.1 “As built” drawings not available.


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12 Drawings (TS-5) Drawings for switchgear 115 kV Please, give us graphic information about the interconnection between equipments conductors’ level, the bus-bars level and the high conductors laying level. Please, provide us the corresponding drawing and also, “as build”.

Refer to Item 11.

13 Drawings (TS-5) Existing Grounding Drawing Substation Please, give us information about the existing grounding drawing substation and earthing system connections for actual Lessos Sustation.

Existing Grounding Drawing Substation not available. Site survey and soil investigation are the responsibility of the contractor. See also TS-1 paragraph 1.1

14 Bid Price Schedules We have noticed that the Price Schedules attached in the Bid, may not be completely

provided. Kindly provide the complete file and also the excel copy of this document for

ease of filling-in.

Editable documents, including the

updated are available on

KETRACO’s website.

www.ketraco.co.ke/tenders

15 Technical Datasheets Kindly provide an excel copy of this file for ease of filling-in. Refer to item 14.

16 Technical Datasheets for 12kV,

15MVAR Shunt Reactor

We have noticed that there are no Technical Datasheets for the 12kV 15MVAR Shunt

Reactor provided in the Bidding Documents. Kindly provide the necessary file.

See page 33 of 74 of the Technical

Datasheets.

17 Technical Documents – 90 MVA

Power Transformer

It can be noticed that in the Technical Specifications and Datasheets of the Transformer,

it is mentioned that the requirement is for a Power Transformer. However on the

document TS-1: Scope of Supply, Page 36 of 37, it is mentioned that the requirement is

for an Autotransformer. Kindly clarify what is required in this tender.

Confirmed Autotransformer

18 Civil works (TS-4) Civil Works Design and Construction

Additional Information.

Could you send or delivery

“Complete Geotechnical Report of the terrain with conclusions and recommendations”

of existing Substation?

(TS-4)-2.3- Surveys and Field

Geotechnical Investigation:

-The Contractor shall carry out a

topographic survey and soil

investigations.

- The Contractor shall carry out field

http://www.ketraco.co.ke/tenders


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geotechnical investigations.

Also see (TS-4)-1.2

19 Scope of supply (TS-1) Point 2.10 – Substation Grounding Design

Additional Information


“Earth or ground or Terrain Resistivity Report of existing Substation?

Refer to Item 11

20 Detailed Requirements (TS-2) Drawings and design “as built”

We are asking about “Plants and sections “as built” of the existing substation”, for 220 and

132 kV. Could you delivery these technical information?

Refer to Item 11


Also, about Single Line Diagram, we are asking a complete single line diagram with

indication of type and manufacturer of the existing relays as well as the complete schemes

of inter tripping and startings of beaker failure and reclosing, etc.

Could you please delivery this technical information?

Refer to Item 11


We are asking the manufacturer and type of communications equipments with plans

and drawings of the existing equipments connections and the centralizing box of the

pairs of the telephone connections and data. Could you please delivery this technical

information?

Refer to Item 11


Could you please delivery the existing supervisory control with model and manufacturer

of the remote terminal units (RTU) and also, if it is applicable, Integral control system

with manufacturer and type (power control System)?

Refer to Item 11

24 Detailed Requirements (TS-2) Drawings and design “as built” Refer to Item 11


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See our point before number 15 (becomes 19 in this list)


“Existing earthing and grounding net plans of existing Substation?


Additional Information and see our point number 14 before (becomes 18 in this list) .

Refer to Item 18



Could you delivery drawings of Drawings with the existing foundations of the different

equipments and structures?

Refer to Item 11

Also see (TS-4) - 1.2- Design, surveys

and Geotechnical investigations.

- The Contractor shall design the

control buildings, and switchyard

equipment foundations for all

substations.



Could you delivery drawings of Drawings with the existing terrain topography and of the

terrain where the station is located or will be enlarged?

Refer to Item 11

An aerial image of the substation is

provided.



Refer to Item 11


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Drawing with the Situation and final location of the delivery in medium voltage energy

and located in the substation land for the current supply of the new auxiliary services?




Drawing with the connection single line diagram of the existing tertiary reactors with

indication of the operation and protection equipments.

Refer to Item 11


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30 Scope of Works – 132kV SS

Extension

We have read that from the Price Schedules and Description of the Extension Works for

the 132kV SS that it consists of supply of only four (4) circuit breakers. These to our

understanding are the bays connected to the new transformer bays from the

220/132kV Transformer (labeled below “New Diameter no. 1”). We however also

believe that the diameter, which consists of 4 additional circuit breakers, wherein the

Eldoret 132kV outgoing line/gantry shall be relocated is also part of the new scope

(labeled below as “New Diameter no. 2”)

In total, the number of circuit breakers for the 132kV scope should be eight (8) and not

four only. Kindly clarify or confirm if our understanding of the scope is correct.

Your understanding for this 132kV

scope is correct. Refer also to

revised price schedules.

31 Eligible Bidders / Conflict of

Interest

We refer to the Instruction to Bidders, clause 4.3 (e). We understand that this clause

shall be interpreted as follows:

Refer to clause 4.3 in its entirety.


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“That a multinational firm’s different branches/ legal entities /factories (around the

world) shall be considered as separate/independent legal entities and may then be

considered to bid as subcontractors to other bidders while only one of the multinational

firm’s legal entity/branch may bid as a main bidder.”

32 Power Transformer Transformer cooling stage and

loading capacity shall be:

ONAN/ONAF/ONAF

100/133/167 PER CENT

a. What is the rated capacity of the transformer at ONAN? 90 MVA

b. What is the rated capacity of the transformer at ONAF1? 119.7 MVA

c. What is the rated capacity of the transformer at ONAF2? 150.3 MVA

d. The power is input from 220KV or from 132KV side of the transformer? 220 kV

e. On Power Transformer specifications, section 2.24.2.1.9, it was mentioned that the

“Power transformers shall be provided with an on load tap changer on the neutral end

of the common high voltage side, suitable for remote and manual control. The range of

regulation shall be ±8 in steps of 1.25% for power transformers on transmission lines

and ± 12 in steps of 1.25% for power transformers on distribution lines .The on-load

tap-changing equipment shall include the following, mounted in a weather proof

cabinet on the transformer tank and wired to terminal blocks”

± 12 in steps of 1.25% as

mentioned in Datasheet


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However, on the Power Transformer Datasheets, it is mentioned that:

Voltage regulation by on-load tap changer on 220 kV winding, range in %

220KV is “+ 12 taps @0,85%”

Please confirm what exactly should be the range of regulation?

f. Please confirm which vector group is required:

YNyn0d11 (3 winding transformer) or

YNa0d11 (auto transformer)

Refer to Item 11

YNa0d11 (auto transformer)

g. There is no impedance in the requirements specified. Please provide information. The design of the autotransformers

is the responsibility of the bidder.

h. Please let us know the BIL of the HV-neutral. In the specification is mentioned only

neutral bushing BIL 95kV. Is this for both (220kV and 132kV)? If it is an autotransformer

we would have only one neutral and the value is clear.

Refer to Item 11

(autotransformer)

i. Is Shell Diala B as transformer oil required or can we offer a different type like Shell

Diala D?

Shell Diala B only, no exception

j. The oil temperature rise is specified with 78°C. I think this should be the hot spot

value and not oil

The assumption is correct


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33 Control Panels location

As to our understanding, the existing 132kV Control Panels shall remain in the existing

control building. The new 132kV Control Panels that will be delivered shall also be

installed in the existing control building. Kindly confirm.

Your understanding is correct. The

new 132 kV Control Panels shall be

installed in the existing Control

Building.


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III. PRE-BID MINUTES OF MEETING

PRE-BID MINUTES OF MEETING

FOR THE

EXTENSION OF LESSOS 220/132/33 kV SUBTATION FOR THE KENYA-UGANDA POWER INTERCONNECTION PROJECT LESSOS-TORORO, KENYA’S PART (LOT B).

Held at Lessos Substation in ELDORET, on the 25th of September 2012 at 10h00 AM.

PRESENT:

From: Kenya Electricity Transmission Company Limited (KETRACO)

1. Peter Mungai Kinuthia, Project Director; 2. Gloria K. Orare, Civil engineer; 3. Brian A. Muchilwa, Electrical engineer; 4. Harrison S. Sungu, Electrical engineer; 5. Samir Chalfoun, Resident Project manager AECOM consult.

From: Kenya Power & Lighting Company (KPLC)

1. Kibias Kiplemoi Manager of Lessos substation; 2. Ronald Siakama, Electrical engineer; 3. Samuel Kaptish, Electrical engineer. 4. Dismus Ogola, System control engineer.

From: Interested bidders - Find attached attendance register.

Objective of the pre-bid meeting:

The purpose of this pre-bid meeting was to present the following issues:

1. Brief overview of the project;

2. Site visit of the installations;

3. Questions from bidders;


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MINUTES OF MEETING

1. BRIEF OVERVIEW OF THE PROJECT

Eng. Peter Mungai welcomed all bidders and introduced the Lessos Kenya Power team responsible for the operation and maintenance of the substation. He briefly explained the scope of the necessary works to be performed for the extension of the 220/132 kV substation switchyard, control building and related civil works.

This project is part of the interconnection project between Kenya and Uganda through the construction of a new double circuit 400 kV transmission line (operated at 220 kV) from Lessos 220/132/33 kV substation to Tororo 220/132 kV substation.

The project is financed by the African Development Bank (ADB).

All bidders shall comply with the technical specifications and project needs as described in the tender documents reference: KETRACO/PT/013/2012; issued on the 10th of September 2012.

EPC contractors are expected to execute this project within duration of 18 months after contract effective date.

It was mentioned that the closing date remains the 9th of November 2012 at 10:00 am and opening of bids will be done at KETRACO’s head office.

Eng. Peter Mungai expressed the need to implement this project by expanding the 220 kV and 132 kV switchyards to accommodate the new 220kV double circuit transmission lines to Kisumu, Tororo , Olkaria, a new 132kV single circuit line to Kabarnet and the relocation of existing 220kV Turkwell and 132kV Eldoret lines .

Mr. Chalfoun, gave a summary explanation of the works to be performed such as:

Extending the 220 kV main bus by adding four (4) 220kV line bay complete with all electrical apparatus, protection, communication and control facilities as well as all related civil works;

Installing new autotransformers with respective reactors and fire walls;

Extending the 132 kV switchgear and all related civil works;

Construction of a new control building fully equipped; Carrying out the site preparation, earth works, slope protection, surfacing and

gravelling the newly extended 220 and 132 kV sections of the substation area;

Interfacing the new SCADA and telecommunication equipment located in the 220 kV control building with the existing system.

In that background, EPC contractors shall present their bids within 28 days from the issue date of this tender notice.

All bidders wishing to make additional visits to the Lessos substation must give written notice (e-mail acceptable) to KETRACO.


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2. SITE VISIT OF THE INSTALLATIONS

The site visit started on time at 10:00 a.m.

Safety regulations were communicated to all the bidders during the site visit and

necessary precautions were ensured to facilitate the visit;

Bidders were shown the existing 220/132 kV switchyards as well as the existing

outgoing 220 kV transmission line to Turkwell and the transmission line to

Eldoret (132 kV), towers to be relocated and all necessary backfilling to be done.

After the substation site visit, all contractors were invited to visit the existing

control room and SCADA system.

The bore hole and the existing water tank will be relocated to the area around

the staff quarters.

Access to the site shall be through an existing earthen road that lies beyond the

staff quarters.

Bidders were informed that new 132kV switchyard shall be stepped in accordance to the layout of existing switchyard. The new autotransformers and reactors are to be on the same the same level as the existing ones. Refer to attachment on Substation Lessos Substation Typical Cross-Section

3. QUESTIONS FROM BIDDERS:

All bidders were informed to submit their questions and other related queries in writing (soft

copies preferred).

All queries & clarifications received before the deadline will be analyzed, responded to and

copied to all bidders. KETRACO is accepting questions and other information up until the

deadline for clarification requests after which no requests for clarifications will be accepted

from any bidder.

END

I.€¦ · possible to replace them for the presentation of the protocol or report executed ......

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