Technical Report 2011 Electricity Networks
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Transcript of Technical Report 2011 Electricity Networks
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8/14/2019 Technical Report 2011 Electricity Networks
1/14
2011
Annualtec
hnicalrepo
rtElect
ricitynetw
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Content
Introduction
The transmission network
The distribution network
Health and safety (H&S)
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Since 1998 the Abu Dhabi electricity sector has been divided into its threeconstituent services: production, transmission and distribution. The single buyer
(ADWEC) purchases all electricity produced from the various power plants,
and then supplies distribution companies at a cost determined by an annually
reviewed bulk supply tariff (BST).
The electrical system in the Emirate is operated by three network
companies: a transmission company (the Abu Dhabi Transmission and
Dispatch Company, TRANSCO); and two distribution companies (Al AinDistribution Company, AADC; and Abu Dhabi Distribution Company,
ADDC), both of which carry out supply-related activities.
This report presents an overview of the performance of these
companies and the quality of their services during 2011.
Introduction
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1. The transmission networkThe transmission network delivers large volumes of electricity from production companies to
users, including the distribution companies.
The sole transmission licensee in the Emirate of Abu Dhabi is TRANSCO.
TRANSCO generates revenue from users via connection fees and a Transmission Use of System(TUoS) tariff that is reviewed annually by the Bureau.
Measuring performanceThe technical performance of the electricity transmission system in Abu Dhabi Emirate compares
favourably with others worldwide. It is quantified using two primary performance measurements:
system unavailability and energy lost.
System unavailability
Transmission system unavailability represents the total time during which the transmission systemis out of service, expressed as a percentage of the total circuit hours in the year.
System unavailability decreased in 2011, compared to 2010. Data analysis indicates that reduced
construction outages were the main cause of improved system availability.
TRANSCO incidents and energy lost
Nine transmission system incidents occurred in 2011, resulting in the loss of 427
MWh - an increase of approximately 390 MWh on the previous year (see Figure 2).
All nine incidents were investigated by the Bureau. The most severe of these
occurred at the Shahama East (SHME) grid station, the Capital Garden (CPGR)
substation and Shamkha mobile.
Figure 1:Transmission system unavailability
0.0%2009 2010 2011
0.2%
1.2%
0.4%
1.4%
0.6%
1.6%
0.8%
1.8%
1.0%
2.0%
Maintenance Construction Users Faults
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A major incident occurred at the 220/33 kV Shahama East grid station on 22 August 2011.
Transformer T202 tripped due to mal-operation of restricted earth fault protection, resulting in
the loss of 146MWh.
A second major incident occurred at the 132/11 kV Capital Garden substation on 21 September
2011. It was caused by an internal software error during a database update and resulted in the
loss of 94 MWh.
The third major incident occurred at the 220/33 kV Shamkha mobile transformer at Shamkha
on 19 October 2011, and involved a trip of the 220 kV WathbaShahama 2 circuit. This incident
resulted in a loss of 89 MWh.
A further six minor incidents occurred at Shamkha mobile 220/33 kV, MOS1 132/11 kV,
KhaznaWathba mobile 220/33 kV, Central 220/33 kV, and Mushrif 132/11 kV.
The number of transmission system incidents was five more than in the previous year, and
the total energy lost as a result showed a significant increase over 2010.
Distribution companies - anomalous incidents and energy lost
An incident is considered anomalous when a fault on the distribution network
results in an outage and loss of demand on the TRANSCO network. During
2011, seven anomalous incidents caused supply interruptions on TRANSCOs
assets. These incidents, which are not included in the performance data shown in
Figure 2, resulted in a total loss of 188 MWh.
Figures 3 and 4 show the trend in anomalous incidents for AADC and ADDC in
which the distribution system failed to isolate the faults, causing the transmission
assets to trip.
Figure 2:Transmission system incidents
02009 2010 2011
50
100
150
200
250
300
400
350
450
500
EnergylostMWh
Numberofincidents
Energy lost Number of incidents
0
1
2
3
4
5
7
6
8
9
10
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The Bureau and network companies are currently examining the issue of anomalous incidents
with a view to improving performance.
Additional transmission developments
Major transmission system developments
The following major transmission system expansion activities were carried outduring 2011:
Commissioning of 132/22 kV substations on Reem Island.
Commissioning of 132/22 kV substations on Saadiyat Island.
Commissioning of the Raha B 132/22 kV, and Green Head, Mushrif, Souq and
Danat 132/11 kV substations.
Commissioning of two 220/33 kV transformers at Bab.
Commissioning of a 220/33 kV substation at ELXR.
Commissioning of a 220/33 kV substation at ICAD.
New 220 kV cable from AAPS to DHMG.
New 400 kV cable from Saadiyat to ADST grid.
Commissioning of Shuweihat 2 (S2) power plant.
Figure 3:Distribution companies - anomalous incidents
02006 2007 2008 20102009 2011
1
2
3
4
5
6
7
8
9
Incidents
Year
10
ADDC AADC
Figure 4:Energy lost through anomalous incidents
02006 2007 2008 20102009 2011
50
100
150
200
250
300
350
400
MWh
Year
ADDC AADC
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Emirates National Grid
The Emirates National Grid, which allows power exchanges between Abu Dhabi, Sharjah, Dubai
and the Northern Emirates, is undergoing further expansion. During 2011 a 400 kV double-
circuit overhead line between Shweihan and Fujairah grid was commissioned. This increased the
cross-border transmission capability between Abu Dhabi and the Northern Emirates.
Commissioning of the GCC interconnection
Commissioning of the 400 kV double-circuit overhead line from Sila to the Shuweihat grid
station was completed, and the UAE transmission system was synchronised with that of
the GCCIA.
The 220 kV double-circuit transmission line from the Al Oha 220 kV substation in Al Ain
to the Mahada 220 kV substation in Oman was completed, allowing the UAE and Omansystems to be synchronised.
The GCC interconnection will improve system security, provide support during emergencies,
reduce generation reserve requirements, and support the development of a common
GCC electricity market.
TRANSCO seven-year planning statement review
The Bureau reviewed and provided feedback on TRANSCOs seven-year planning
statement, released in 2011. Following discussions with the Bureau, TRANSCOincorporated an enhanced strategic plan that provides a long-term view of the
system to 2030. The plan will be updated annually in conjunction with the seven-
year planning statement.
WESTERN REGION
AL AIN REGION
Ras al Khaimah
Dhaid
MadinatZayed
ADNOCSila
Shahama
ShweihanUmm AlNar
Wagen
Arad
Wathba
Musaffah
Sanaiya
Al Ain PowerStation
Samha
Taweelah
Electricity system expansion
Umm El Oush
Hayer
Al Foah
Dahma
Al AinSouthwest
DEWAWarsan
Umm Al Quwain
AjmanSharjah
Qidfa(Fujairah)
DUBAI
Abu Dhabi
SaadiyatReem
Asab
Liwa
Bu Hasa
Bab
Ghaythy
Ruwais
Mirfa
Shuweihat
Interconnectionto Oman (Wasit)
220 kV Lines
400 kV Lines
Under construction
Power Stations
Figure 5:Transmission system
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2. The distribution networkThe distribution system comprises the final stage in the delivery of electricity to end-users. As
of 31 December 2011, the total number of customers connected to the two networks was
281,966 (ADDC)1and 123,318 (AADC)2.
Peak demand load in 2011 was 4,260 MW for ADDC3and 1,940 MW for AADC4. ADDC recorded
a growth in peak demand of 9.5% in 2011 over 2010, while AADC experienced a 7.8% rise over thesame period (see Figures 6 and 7).
Figure 6:ADDC maximum demand5
Figure 7:AADC maximum demand6
1 ADDC, Technical Assessment of the Price Control Return Relating to 2011 Financial Year, Final
Report, April 2012.
2 AADC, Technical Assessment of the Price Control Return Relating to 2011 Financial Year, Final
Report, April 2012.3 ADDC, 5 Year Electricity Planning Statement 20132017, June 2012.
4 AADC, 5 Year Electricity Planning Statement 20132017, June 2012.
5 ADDC 5 Year Electricity Planning Statement , op. cit.
6 AADC 5 Year Electricity Planning Statement , op. cit.
02006
2,794
2007
3,099
2008
3,339
2009
3,693
20112010
4,260
3,889
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
4,500
MW
02006
1,400
2007
1,521
2008
1,562
2009
1,683
20112010
1,940
1,799
500
1,000
1,500
2,000
MW
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Distribution network assets data7
Quality of supplyEnsuring quality of supply for end-users requires high performance in all three elements of the
network: generation, transmission and distribution. However, distribution is by far the most significant
of these in determining quality of supply.
Since the introduction of performance indicators in 2006, the Bureau has closely monitored the
network performance of AADC and ADDC. The Bureau requires that an independent audit of
annual performance data be carried out by a technical assessor each year.
After reviewing the findings of the 2011 audit, the Bureau noted some improvements in
ADDCs monitoring performance.
AADCs data quality has improved, but many of the recommendations made in the 2010
technical assessment audit have not yet been implemented.
The Bureau utilises two key performance indicators (KPIs) to determine the performance
and reliability of the ADDC and AADC distribution systems:
The System Average Interruption Duration Index (SAIDI), calculated from the
total number of customer minutes lost (CML) in any one year, divided by the total
number of connected customers (at year-end).
The System Average Interruption Frequency Index (SAIFI), calculated from the
total number of customer Interruptions (CI) in any one year, divided by the total
number of connected customers (at year-end).
The distribution companies record customer interruptions and calculate KPIs
according to specific procedures developed by the Bureau.
7 Ibid.; and ADDC 5 Year Electricity Planning Statement , op. cit .
ADDC DISTRIBUTION SYSTEM No. of
units
Capacity
(MVA)
132/22 kV primary SS 12 3,840
132/11 kV primary SS 33 5,080
33/11 kV primary SS 231 6,610
22/0.4 kV distribution SS 122 376
11/0.4 kV distribution SS 13,779 17,287
ADDC CABLE /
OVERHEAD LINE
SYSTEM
Length (km)
33 kV 5,747
22 kV 274
11 kV 13,020
0.4 kV 11,546
AADC CABLE /
OVERHEAD LINE
SYSTEM
Length (km)
33 kV 3,529
11 kV 9,259
0.4 kV 9,945
AADC DISTRIBUTION SYSTEM No. of
units
Capacity
(MVA)
33/11 kV primary SS 150 5,120
11/0.4 kV distribution SS 14,583 8,025
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ADDC performance
ADDCs SAIDI and SAIFI KPIs are shown in Figures 8 and 9.
Figure 8:AADC System Average Interruption Duration Index (SAIDI)8
Figure 9:ADDC System Average Interruption Frequency Index (SAIFI)9
Note: An adjustment was made to the 2006-2008 SAIDI/SAIFI figures to facilitate comparison with the2009 figures, owing to a change in ADDCs customer interruption reporting methodology in 2009.
The improvement in ADDCs SAIDI/SAIFI values between 2010 and 2011 was
mainly a result of less planned outages being required during the upgrading and
replacement of the 11 kV distribution switchgears in the central region. The
cancellation of the substation AMR works also contributed to this reduction.
Furthermore, the Eastern and Western Regions experienced fewer cable and
overhead line faults, and a significant increase in their numbers of customers.
8 ADDC, Technical Assessment , op. cit.
9 Ibid.
02006
184.6
2007
157.6
2008
173.7
2009
185.9
20112010
107.0
205.3
20
40
60
80
100
120
140
160
200
180
220
240
SAIDI
02006
1.77
2007
1.58
2008
1.65
2009
1.74
20112010
1.71
1.99
0.5
1.0
1.5
2.5
2.0SAIFI
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AADC performance
Figures 10 and 11 show AADCs SAIDI and SAIFI KPIs.
Figure 10:AADC System Average Interruption Duration Index (SAIDI)10
Figure 11:AADC System Average Interruption Frequency Index (SAIFI)11
The improvement in AADCs SAIDI/SAIFI values in 2011 was mainly due to the
installation of overhead line auto-reclosers and sectionalisers in 20082009,
new primary 33/11 kV substations being added in the City Region, and the
undergrounding of a number of overhead lines.
Both companies are introducing the capability to control their systems remotely and
restore power during severe weather events, and the Bureau has recommended
targeted investment programmes for regions that have suffered consistently poor
performance.
Related events
10 AADC Technical Assessment op. cit .
11 Ibid.
02006
265.8
2007
165
2008
220.7
2009
261.34
20112010
134.65
186.86
20
40
60
80
100
120
140
160
200
180
220
240
260
280
300
SAIDI
02006
3.6
2007
2.63
2008
2.76
2009
2.78
20112010
1.45
1.92
0.5
1.0
1.5
4.0
2.5
3.0
3.5
2.0SAIFI
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Related events
Electricity wiring regulations training
Two nominated companies continue to provide regular training courses on electricity wiring
regulations for private contractors. The five-day course, based on a programme developed by
the Bureau, includes both theoretical and practical elements, as well as a final examination.
The Bureau maintains a list of registered engineers who have successfully completed the
course (169 passed in 2011), which is available on its website. The aim of this training initiative
is to improve the skill levels of electrical contractors in Abu Dhabi, as well as to streamline
procedures for the approval and testing of wiring in new buildings.
Asset risk management review
The rapid development and associated demand growth within Abu Dhabi Emirate in recent years has led
the network companies to invest heavily in network assets. In order to maximise the benefits of this activity,
and to avoid future acute operation and maintenance issues, it is vital that assets and associated risks are
managed effectively.
An important aspect of this is the process of determining and assessing the network companies
current asset risk management performance against international best practice in order to identify
any areas for improvement.
Towards the end of 2011, the Bureau appointed an external consultant to review the companies and
assess their asset risk management performance. The review will be complete by Q3 2012 and a
programme developed to implement the resulting recommendations.
AADC and ADDC five-year planning statement reviews
Each year the Bureau reviews and comments on the five-year planning statements
produced by each of the distribution companies. The parties then discuss the observations
of the Bureau in order to improve the quality and format of their statements.
Connection process improvements
During Q3 of 2011, the Bureau collaborated with ADDC to review the companys
existing electricity connection process, with the aim of reducing the overall time required
for connection.
KPIs were selected at various stages of the process, and their results monitored by both
parties. Wherever a KPI highlighted a significant delay, ADDC and the Bureau worked
together to understand the cause and develop appropriate action plans.
Emergency load reduction plans
During 2011, the Bureau set up a working group and carried out a review of
TRANSCO, AADC and ADDC emergency planning.
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The review led to significant developments in the AADC and ADDC emergency load reductionplans, which will improve the management of emergencies in which load shedding is a requirement.
As a result, measures are now in place to determine demand prioritisation and minimise the
effects of load reduction on consumers, whilst maintaining the security of the power system.
Reem Island mega development
At the request of the Government, the Bureau cooperated with Bunya and ADDC to facilitate
the asset transfer of electricity and water network infrastructure to Reem Island.
Reem Island is considered a mega development, in which the developer builds the infrastructure to the
Distribution Companys standards and specifications, and the assets are transferred upon completion.
3. Health and safety (H&S)
H&S performance: electricity and waterThe table below summarises the health and safety performance of the electricity and water networks
operated by TRANSCO, AADC and ADDC during 2011.
During Q3 of 2011, a review of AADC and ADDC H&S management and operational
systems and processes was completed. The review was conducted by an external consultant
at the request of the Bureau, and follows the successful completion of a similar appraisal of
TRANSCO in 2010.
The Bureau will use the data from these reviews to achieve significant improvements in
H&S performance, working with network companies to implement action plans for thispurpose. The Bureau also organised best practice workshops for the beginning of 2012
to share the lessons learnt from the process with the rest of the sector.
Following on from the work carried out in 2010 to establish the Bureaus internal
Environment, Health and Safety Management System (EHSMS), the AD EHSMS
Centre completed its review of the system and gave its approval during Q1 of
2011; the Bureau began to implement the system thereafter.
During the latter part of 2011, the Bureau was appointed Sector Regulatory
Authority (SRA) for the Wastewater Sector, and began working closely with the
AD EHSMS Centre and other entities to develop codes of practice for the sector.
LICENSEE Total man hours
worked Fatalities
Lost time
injuries (LTI) Minor injuries
AADC 22,397,728 0 2 0
ADDC 13,278,754 0 4 6
TRANSCO 17,497,060 0 4 156
Total 53,173,542 0 10 162
Figure 12:Health and safety performance, 2011
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Abbreviations and Acronyms:
AADC Al Ain Distribution Company
ADDC Abu Dhabi Distribution Company
ADWEC Abu Dhabi Water and Electricity Company
BST bulk supply tariff
CML customer minutes lost
CI customer interruption
EHSMS Environment, Health & Safety Management System
FAPCO Fujairah Asia Power Company
GCC Gulf Cooperation Council
GCCIA GCC Interconnection Authority
H&S health and safety
KPI key performance indicator
HV high voltage
kV kilovolt
MVA megavolt ampere
MWh megawatt hour
SAIDI System Average Interruption Duration Index
SAIFI System Average Interruption Frequency Index
TRANSCO Transmission and Despatch Company
TUoS transmission use-of-system