Current Network Condition

1
Current Network Condition

• Characterised by aged, under designed and
  technically obsolete infrastructure
• Old-fashioned oil insulated switchgear
  unreliable tripping times
• Inadequate (sometimes embarrassingly primitive)
  monitoring and protection systems
• Result - High number of outages
• Plant maximum life cycle exceeded
• SHER non-compliant
• No system integration

2

• Initiatives to Reduce Outages

• Network Master Plan
• Eskom (PTM) Engineering Studies
• Detail Audits by OEMs
• Rotek Engineering
• Siemens
• ABB
• Alstom
• Hawker Siddley
• Internal Audit
• Focus on planned maintenance

3
NETWORK MASTERPLAN

• PSW Consulting Engineers were appointed to assist
  in the preparation of Short, Medium and Long term
  Transmission and Distribution plans for the
  Midrand Area of supply.
• NET Group Consulting Engineers were appointed to
  assist in the preparation of Short, Medium and
  Long term Transmission Plans for the entire
  Network excluding the Midrand Area of supply.
  They were also appointed to assist in preparing
  Distribution plans for three focus areas where
  loading and network problems were being
  experienced in the Siemert Road, Randburg and
  Roodepoort Areas.
• Eskom (PTM) were also appointed to do
  pre-engineering studies at Fordsburg, Prospect,
  Delta, Kelvin and Orlando substations

4
Findings

• PSW Midrand Report
• The infrastructure in Midrand supply area is
  relatively new with an average age of between 15
  20 years. There are certain areas however which
  are appreciably older and will require upgrading
  and refurbishment in the Short term
• The infrastructure needs to be extended to meet
  projected future load growth

5
Substation Transformers Overview

• Detailed audit undertaken by Rotek and CPs Test
  Branch
• Significant number (52) of high risk transformers
  identified in terms of standard assessment
  parameters (moisture, DP, gases, acidity etc.)
• Age profile of transformers indicates urgent need
  for refurbishment / replacement programme
• Programme designed to eliminate backlog by 2010
  (or sooner) thereby greatly improving reliability
• Refurbishment programme to continue to reduce
  life cycles and conditions to acceptable levels

6
Sample Transformers Age Profile
7
Transformer Refurbishment 5 Year Plan
Note Total Trfr 250 Refurbished and
maintained 45 52 to be addressed
8
MV Switchgear Overview

• Detailed audit undertaken by OEMs e.g. Rotek,
  Siemens
• Significant number of high risk switchboards
  identified in terms of standard assessment
  parameters, particularly oil insulated units
• Age profile of transformers indicates urgent need
  for refurbishment / replacement programme for
  switches gt25 years
• Programme designed to eliminate backlog by 2010
  (or sooner) thereby greatly improving reliability
• Refurbishment programme to continue to reduce
  life cycles and conditions to acceptable levels

9
Age Profile All MV Switches
10
MV Switchgear Programme
11
Protection Audits by OEMs and Eskom

• Audits on secondary plant equipment focusing
  mainly on protection were conducted by
• ABB
• Siemens
• Eskom PTM
• Alstom
• And Internal Staff

12
Findings

• Main protection is prone to malfunction
• Backup protection in most cases is out of
  specification
• 70 of protection relays gt 20 years old, no
  spares available
• The suite of electro mechanical relays per line
  should be replaced with new electronic relays
  catering for the complete set of protection
  requirements, including disturbance recording.
• Protection Schemes - 40 of the Overcurrent and
  Earth Fault protection relays tripping
  characteristics had an error margin of
  approximately 60.
• Repairing and refurbishing of electro-mechanical
  relays is not a cost effective solution

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Additional CAPEX Refurbishment Requirements
Minimum required to clear backlog in 5 Years
2005/06 2006/07 2007/08 2008/09 2009/10
Transformer R52m R25m R25m R22m R22m
Switchgear R45m R45m R45m R30m R12m
Protection R19m R15m R9m R7m R2m
Total R116m R85m R79m R59m R36m
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CAPEX requirements 2005/10
Refurbishment and Upgrade Load Growth Total
HV R1,130bn R381m R1,511bn
MV R532m R70m R602m
LV R100m R32m R132m
Grand Total R2,245bn
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Upgrade Programme and Assumptions

• City Power has begun an intensive upgrade
  programme in order to achieve the following
• Reduced average age of equipment thru
  maintenance
• Replacement of obsolete equipment maintenance
  not feasible
• Upgrade of overloaded networks in order to
  compensate for natural and anticipated load
  growth
• Removal of equipment which is unsafe to operate
• Achieve standardisation across all areas in order
  to reduce downtime and have more available
  emergency stock
• Eradication of makeshift solutions
• Ensure higher plant availability

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CAPEX and OPEX Investments per Region
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2005/6 Capex Budget Allocation
CATEGORIES Total
Electrification 35,150,000
Service Connections 59,640,000
Township Reticulation 14,049,000
Network Development 27,850,000
Upgrade of Electrical Network 246,018,000
Refurbishment of Bulk Infrastructure 130,831,000
Tools and Loose gear 3,035,000
Plant and Machinery 2,483,000
Meters 16,000,000
Load Management 15,000,000
SCADA 6,500,000
Protection 20,000,000
Public Lighting 30,250,000
Telecommunications Equipment 1,476,000
Furniture 811,001
Office equipment/Computer hardware 769,000
Computer software 3,100,000
Building Alterations 8,513,000
CAPITAL - OPERATIONS 608,282,000
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Some Key projects for 2005/06

• Replacement and upgrade of substation
  transformers (17transformers ordered to be
  installed at Westfield, Cydna, Hursthill,
  Rosebank, Roosevelt, Grand Central, Bryanston,
  Allandale, Brynorth, Randburg, Olivedale and
  Fairlands)
• Protection upgrade at Kelvin and Prospect major
  intake points
• Replacement of obsolete feeder boards
• New substation at Bryanston to cater for pending
  re-zoning application
• Continuous upgrade and refurbishment of MV and LV
  infrastructure

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Key priorities for 2005/06

• Reconfigure 275 KV using Dead Tank Circuit
  Breakers and Pantograph Isolators to address
  outages at Fordsburg, Prospect and for Delta to
  be able to handle the surplus load
• Installing prepayment meters in the identified
  areas in the South of Johannesburg
• Increase continued partnership with OEMs to help
  address critical network problems
• Increase our focus on planned maintenance
• The defective meters that have been identified
  and they will be replaced
• Increase in the reduction of illegal connections
  in identified areas
• A major focus will be dedicated to street lighting

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• PROJECTS COMPLETED DURING 2004/5 FINANCIAL YEAR

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2004/5 Randburg Area of Supply
Project Name Elgin distributor upgrading C513 Project Description Laying of new cable (9km) to upgrade the Elgin distributor from Bryanston Substation Desired Solution The project will increase back-feeding capacity during contingency conditions. It will assist in ensuring compliance with conversion from 6.6kV to 11kV in the future.
Project Name Norman distributor upgrading Project Description Laying of the new cable to upgrade the Norman distributor from Bryanston Substation. Desired Solution Increase back-feeding capacity during contingency conditions. It falls within master plan to convert Bryanston 6.6kV to 11kV.
Project Name Brynorth Substation new MV distribution Project Description Laying of the new cable to establish new distributor from Brynorth Substation. Desired Solution To provide extra capacity in Bryanston area to cope with the fast growing developments in the area
Project Name Dainfern network upgrade C571 Project Description This is the second phase of the project where new MV cables are installed and new load centers will be installed to alleviate Dainfern loading problems in winter. Desired Solution Overloading problems in Dainfern will be resolved by upgrading the low voltage side of the network.
Project Name De-loading of Bryanston Substation C610 Project Description Laying of two cables from Brynorth Substation to Bryanston Substation in order to supply Norman and Elgin distributor from Brynorth. Desired Solution Capacity at Bryanston Substation will be reduced to alleviate overloading of the Station. A standby distributor will support Elgin and Norman Distributors.
Project Name Randpark Ridge Closing of Radial feeder Project Description To lay new cable in order to put nine load centers on a ring. Desired Solution Improvement of restoration time during fault condition due to the supply on a ring.
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2004/5 Randburg Area of Supply
Project Name HOUTKOPPEN SUBSTATION Project Description Installation and commissioning of new 11Kv feeder board and control panels. Desired Solution Replacement of the existing 11kV feeder board to provide improved service delivery to City Power customers in the Houtkoppen substation area of supply. Provision of an additional five distribution circuits from the station.
Project Name HOUTKOPPEN SUBSTATION Project Description Establish new substation building and switchgear room. Desired Solution Upgrading of the existing substation precinct in preparation, for the installation of the newly procured 11Kv feeder board.
Project Name Morningside S/S, Incomer, Bus Section and Control Panel Project Description City Power to supply, fit new panels Eskom to supply, install 6.6kV cables from existing 5MVA Transformer.
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2004/5 Hursthil Area of Supply
Project Name Noordgesig conversion from 6.6kV to 11kV Project Description Installation of 15 new mini-subs and laying of cable to support conversion of entire Noordgesig from 6.6kV to 11kV. Desired Solution Extra capacity to Noordgesig, overloading will be alleviated and new sub rings will assist in quicker fault restoration.
Project Name LV Network upgrading C607 Project Description To install new LV equipment in the area of Fairland and to remove obsolete LV equipment. Desired Solution Reduction in outages due to obsolete equipment and increase safety.
Reasons for the Project The electricity network in Sophiatown was found to have an inferior design based on todays growing demands. A section of the network was approved to upgrade from the current single phase LV network to a three phase LV network. Status of the project All MV and LV cable has been installed. A 500kva miniature substation has also been installed. 30 of work is still outstanding to be completed by the end of May 2005. Benefits of the Project A more stable electricity supply, Reduction of power outages.
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2004/5 Siemert Area of Supply
Project Name LV Network upgrading C505 Project Description Installation of arial bundle conductors in Kensington area and removal of T-joints. Desired Solution Reduction in power outages due to bare conductors and removal of t-joint to enhance system reliability.
Project Name Judith Paarl LV Upgrading Project Description To install new miniature substation to alleviate overloading of Judith Paarl in Derby Road and Long Street Desired Solution To improve power supply around Ellispark Precinct and reduce power interruptions.
Project Name Houghton upgrade MV network Phase 1 Project Description Installation of new cables from Cydna Substation to Riviera Substation for providing standby for Houghton West, Oaklands/Houghton, Houghton South East, Killarney South distributors. Desired Solution Reduce size of sub ring and reduction of load on Houghton West distributor and Oaklands distributor. To allow for future growth in the area and prepare for the future conversion.
Project Name Athol Inanda standby distributor Project Description Installation of cable from Cydna Substation in order to upgrade Athol Inanda standby distributor and upgrading of other distributors in that area. Desired Solution Reliability of the cable will improve as from elimination of many joints. Undergrounding of LV along the same route will stabilize the network.
Project Name Melrose Conversion Phase 1 Project Description Installation of new equipment to prepare for conversion from 6.6kV to 11kV in Melrose area and closing of two radial feeders. Desired Solution Reliable power in Melrose area and quick fault restoration as a result of feeder.
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2004/5 Siemert Area of Supply
Project Name Melrose, Houghton, Riviera Conversion Phase 2 Project Description Installation of new equipment to convert from 6.6kV to 11kV. Desired Solution Extra capacity due to 11kV conversion and more reliable power supply as the result of taking out obsolete equipment.
Project Name Upgrade electrical network Malvern Project Description Installation of new load centers to relieve load from the existing infrastructure in Malvern area. Desired Solution More reliable power supply due to elimination of overloadings in Malvern Area.
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2004/5 Midrand Area of Supply
Project Name New 11kV distribution from Westfield Sub to Founders Hill and Sebenza Ext 6 Project Description Installation of new cables from Westfield Substation to Sebenza Ext 6 for conversion from 6.6kV to 11kV Desired Solution Increased capacity of the network in Founders Hill and Sebenza. The project will alleviate power interruptions from Ekurhuleni
Project Name Vorna Valley S/S Incomer Cables Project Description Replacing existing 300mm x 3 core cables with 630mm single core cables with two single cores per phase to cater for newly installed 2 x 20 MVA Transformers, including installation of new 1200/5 CT'S. Desired Solution Network Upgrade
Project Name ALLANDALE SUBSTATION 11Kv feeder board Project Description Installation and commissioning of new 11Kv feeder board. Desired Solution Replacement of the existing 11kV switchgear arrangement. And thus to improve, service delivery to City Power customers in the Allandale substation area of supply.
Project Name Noordwyk S/S 3rd Incomer Panel Project Description Installation of 11kV Incomer Panel to accommodate new 20 MVA Eskom Transformer. Desired Solution Network Upgrade in order to meet load growth
Project Name ALLANDALE SUBSTATION 88/11Kv transformer Project Description Installation and commissioning of new 88/11Kv transformer. Desired Solution To provide a reliable standby facility at the sub-station in the event of an existing unit failure.
Project Name Vorna Valley S/S Perimeter Fence Project Description The station currently has no perimeter fencing and is open to everybody. Desired Solution To provide security for personnel by having a lockable entrance gate.
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2004/5 Lenasia Area of Supply
Project Name Installation of standby cable for Lenasia Ext 4 Project Description Installation of new distribution from Lunar Substation to OK Bazaar HVC. Desired Solution Speeding up of back feeding process during contingency.
Project Name Upgrading of Mini substation and load centers in Lenasia Ext 1, 2 and 3 Project Description Installation of new mini subs and closing sub rings in Lenasia ext 1, 2 and 3. Desired Solution Power interruption will be reduced and will ensure reliability of the network. Overloading problems will be alleviated in Lenasia ext 1, 2 and 3.
Project Name LAWLEY Project Description Normalisation of the network infrastructure Desired Solution Change conversional metering to Pre- Paid system
Project Name GOLDEN TRIANGLE Project Description Electrification Desired Solution Electrify 2430 stands
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2004/5 OLD JOHANNESBURG AREAS
Project Name Kelvin P/S 88kV Insulation Upgrade Project Description Upgrading of insulation of the 88kV circuit breaker and isolator, bushings Desired Solution To prevent flashovers by providing the insulators with a hydrophobic surface characteristic to prevent the formation of continuous wet conductive layer
ALL AREAS
Project Name Asbestos Removal from all Sub Stations Project Description Capex Environmental Compliance Monitoring. Desired Solution complying with the Environmental Impact Assessment regulations requirements as per Act No. 73 of 1989.
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2004/5 Alexandra Area of Supply, incl
electrification projects
Project Name ALEXANDRA EXT -8 Project Description Electrification Desired Solution Electrify 180 Stands
Project Name GOLDEN TRIANGLE Project Description Electrification Desired Solution Electrify 2430 stands
Project Name TSUTSUMANI AND MAYIBUYE Project Description Electrification Desired Solution Change metering from IMS to Grintek system
Project Name LAWLEY Project Description Normalisation of the network infrastructure Desired Solution Change conversional metering to Pre- Paid system
Project Name ALEXANDRA PHASE 2 Project Description Normalisation of Alexandra network infrastructure Desired Solution To Connect Customers to Overhead system and reduce illegal connection
Project Name ELECTRICAL INFILLS Project Description Electrification Desired Solution Electrify 500 stands within Citypower area of supply
Project Name ALEXANDRA PHASE 2 ELECTRICAL INFILLS Project Description Electrification Desired Solution Electrify 350 connections in Alexandra
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2004/5 Roodepoort Area of Supply
Project Name MANUFACTA TO ROODETOWN SUBSTATIONS Project Description Replace 33kV oil cables Manufacta to Roodetown substations. Desired Solution Upgrading and replacement of aging oil filled transmission cables. Providing system integrity, and security of supply to the customers in this area of supply. Project Name ONTDEKKERS TO NURSERY SUBSTATIONS Project Description Replace 33kV oil cables Ontdekkers to Nursery substations. Desired Solution Upgrading and replacement of aging oil filled transmission cables. Providing system integrity and security of supply to the customers in this area of supply. Project Name SENTRAAL AND KLOOFENDAL SUBSTATIONS Project Description Load optimization Desired Solution To alleviate the loading challenges at Kloofendal and Sentraal substations and to provide improved service delivery to City Power customers in this area of supply.
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2004/5 Roodepoort Area of Supply
Roodepoort MV cable upgrade Project Reasons for the Project It was identified that sections the MV cable supplying the 6.6kV and 11kV distribution areas in Roodepoort were of extremely poor quality which had come to the end of its lifespan causing large parts of the town to loose their electricity supply at random patterns.Investigation and analysis was done on this cable indicating that it had to be replaced. A project to correct this situation was approved in November 2004 and commenced in December 2004. This project was to be executed in 3 phases i.e. - Phase 1 Weltevreden Park Phase 2 Constantia Kloof, Helderkruin Phase 3 Wilropark, Roodekrans, Ondekkerspark and Horison Status of the Project A total of107 km of the ill fated cable in Roodepoort was approved to be replaced. To date we have laid 96 km in the ground. To date all cable in Phase one and Phase two have been installed. We have created outage plans which are currently in place to disconnect the old cable and connect the new ones. To date we have commissioned 82 new cable ends in phase 1 and 47 new cable ends in phase 2. We still have to commission 5 more cable ends in phase one and 79 more cable ends in phase two. By 11th May 2005 all of Weltevreden Park will be operating with new cable. Currently we are repairing paving in driveways and tiding up all construction rubble in the area. Benefits of the Project Reduction of power outages and Increase spare capacity on existing network.
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2004/5 Roodepoort Area of Supply
Paul Kruger Rd MV and LV upgrade Reason for the Project This area in Honeydew is developing at a very fast pace. The existing MV overhead line network is not able to carry loads during peak periods. A project was approved to remove the OHL and install our standard MV cable, 185 x 4 copper, with minisubs and an underground LV network. Status of the Project 90 of the MV cable has been installed. 60 of the MV switchgear has been installed. The project is scheduled to be commissioned at the end of May 2005. Benefits of the project Reduction of power outages and Increase spare capacity of existing network.
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2004/5 Roodepoort Area of Supply
Installation of Miniture substations and Compact switchgear Reasons for the Project It has been identified that the majority of mini substations in Roodepoort contain no switchgear. This makes fault finding and power restoration extremely difficult. A project was approved to install compact switchgear and mini-subs where necessary which will run concurrent with the Roodepoort cable upgrade Project. Status of the Project These are currently being installed in conjunction with the commissioning of Phase 1,2 3 of the Roodepoort Cable Upgrade Project. Benefits of the Project Proper fault finding procedures can take place. No damage to existing cables and bushings while fault finding. Faster fault finding can take place. Faster fault restoration time. Safe working environment.
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Public Lighting Projects
Region Project Description
Region 1 High Mast refurbishment in Diepsloot and illumination of main intersections within Diepsloot Region.
Region 2 New installation in - Ivory Park, Network extension in Noordwyk Ext, Halfway Gardens, Halfway House, Lonehill intersections Austin View, Buccleuch, Sunninghill and Paulshof
Region 3 New installation in - Main Roads within Olivedale, Khyber Rock, Brynston, Magaliesig, Dunkeld West, Sandton, Jukskei Park. Upgrade of street lighting cables in Johannesburg North.
Region 4 Network extension in Victory Park, Fairlands. Refurbishment of street light luminairees in Bosmont/ Coronationville, Beyers Naude drive.
Region 5 New installation in Northwold, corner Peter Road and Beyers Naude, Davaidsonville, Northriding, Florida Park. Refurbishment of street light luminnaires in Discovery, Roodepoort CBD, Florida North, Querelina.
Region 6 Soweto Development Programme continuation, Refurbishment of vandalised High Masts in Soweto and new installation in Dobsonville Ext 3.
Region 7 Wynberg refurbishment, Modderfontein residential refurbishment, London and Malboro Road refurbishment. New installation in Kelvi, Wendywood, Morningside Manor, Rembrant Park
Region 8 Luminaire conversion for MV to MH at the CBD and motorway refurbishment
Region 9 Installation of new street lights at Naturena x19, Golden Highway, Meredale, Oakdene and Pat Mbatha Drive. Refurbishment of Vickers Road
Region 10 Soweto Development Programme continuation, Nomzamo informal settlement and ground to pole box conversion project.
Region 11 Installation of new street lights at Orange Farm/Driezik/Stretford and Lawley Station.Refurbishment of vandalised network in Eldorado Estate. Illumination of entrances to the Region 11 admin offices.