national electrification indaba 16 march 2012 electrification technical aspects nomvula kungwane
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National Electrification IndabaNational Electrification Indaba16 March 201216 March 2012
Electrification Technical AspectsElectrification Technical Aspects
Nomvula KungwaneNomvula Kungwane
National Electrification IndabaNational Electrification Indaba16 March 201216 March 2012
Electrification Technical AspectsElectrification Technical Aspects
Nomvula KungwaneNomvula Kungwane
CONTENT
Connections History
Background
Impact on Electrification
KZN; EC and Limpopo infrastructure
2
Backlogs, EC; KZN and Limpopo
Designs
Conclusion
BACKGROUND
• Urban electrification was largely done in the past
• un-electrified households in urban areas are mostly growth & informal settlements
• Easy-to-execute projects were also done during the massive electrification program of the past
• Reality now:
• Difficulty to implement electrification projects without bulk infrastructure development
• rural electrification with high costs
• Funds are stretched to address both bulk infrastructure and household connections
IMPACT
• Less connections achievable
• There is a continuous need for the integration of the Electrification programme with Eskom’s Capital programme across Eskom divisions, esp. Transmission and Distribution
• example on planned infrastructure projects in the Eastern Cape, below
DESIGNS
• Changed from designing for initial ADMD to final ADMD designs and implementation
• Cheap designs = high maintenance costs
• Designs have evolved over the years, with mid-block (cheaper but difficult to reach for maintenance) and street-front
• SWER & dual-phase networks have been changed for 3-phase networks to accommodate future growth
• Split Metering technology implemented in some areas, to curb tempering
• it is necessary to ensure that poles, conductor, and line hardware incorporated in existing designs are used optimally - spans should be maximized
• Optimisation of designs for rural networks: installation of MV and LV conductors on the same poles/line
PROVINCE TOTAL NUMBER OF HOUSEHOLDS
BACKLOG (with growth)
Backlog (%)
EASTERN CAPE 1,683,420 647,593 19%
KWAZULU NATAL 2,439,751 816,354 24%
LIMPOPO 1,264,792 322,172 9%
. . . .
. . . .
. . . .
. . . .
TOTAL NATIONAL 12,860,165 3,440,699 100%
BACKLOGS: EC; KZN & LIMPOPO
NATIONAL ELECTRIFICATION BACKLOG
KZN 24%
LIMPOPO 9%
GAUTENG
MPUMALANGA7%NORTH WEST
6%
FREE STATE6%
NORTHEN CAPE1%
WESTERN CAPE 6%
EASTERN CAPE 19%
KZN BACKLOGS OVERVIEW
KZN NETWORK STATUS
SUBSTATIONS REQUIRED
Bulk Infrastructure Movement - Last 3 years
• Completed
Mandabeni; Nyokeni; Sgananda kaZokufa Shezi; Msinga; Hlabisa; Dlangezwa; Pomeroy
• Under Construction
Kenterton; uMzumbe; Ndwedwe; Mathondwane; Ladysmith; Corinth; Umzimkhulu
• *Bulk Infrastructure Focus Areas
Umkhanyakude; Ndumo; Gezisa, Mbazwana; Hlabisa; Gunjaneni; Ntambanana; Melmoth East; Mandini; ; Mangethe; uMshwathi; Applesbosch; uMzumbe; KwaXolo/KwaDeshula
• *These substations are for the sole purposes of rural electrification, there are other Substations planned to be built by Eskom which will also assist in electrification
Eastern CapeEastern Cape
13
Qunu
Tyalarha
Sappi
Paynes Farm Mafini
Kohlo
QumbuUgie
DumasiMagwa
Siphaqeni
Wiloi
1st Falls
EXISTING NETWORK
PROJECTS FOR 2012/13/14
Qunu
Tyalarha
Sappi
Paynes Farm
Mafini Kohlo
QumbuUgie
DumasiMagwa
132kV line to Hombe S/S and 2 x 10MVA 132/22kV Hombe s/s (R)Sappi/Elliot 132kV line and 1 x
40MVA 132/66kV Elliot substation (S)
Elliot/Ugie 132kV line (RR)
Decomission old 66kV line and associated substations (R)
132kV link line (16km) 2 x 20MVA 132/22kV Tombo s/s (S)
132kV line (30km)2 x 20MVA 132/22kV Mfinizo s/s (DoE)
132kV line (30km)2 x 20MVA 132/22kV Taweni s/s (DoE)
2nd 20MVA 132/22kV Qumbu S/S Trfr (RR)
4 132kV feeder bay (S)Vuyani/Zimbane 1 132kV line; Vuyani/Zimbane 2 132kV lineVuyani/Mafini 132kV line; Vuyani/Qunu 132kV line
2 x 10MVA 132/22kV Mjika s/s132kV link lines (4km) – (S)
132kV link line (2km)2 x 20MVA 132/22kV Mafini s/s (S)
VUYANI MTS PROJECTEros/Vuyani 400kV line, 3 x 250MVA 400/132kV Vuyani Substation (S)
Zimbane/Paynes 132kV line & 2 x 20MVA 132/22kV Paynes Farm S/S Paynes Farm/Sappi 132kV lines & 2 x 20MVA 132/22kV Sappi S/S (S)
Qolweni/Hlobo and Hlobo/Vuyani 132kV line, 2 x 20MVA 132/22kV Hlobo S/S (S)
LimpopoLimpopo
16
LIMPOPO PROVINCE Network Status
17
Red – Network constrained
Yellow – Limited capacity on large parts of network
Green – Capacity Available
18
Bolubedu
Mamitwa
Mooketsi
Tarentaal
BendstoreMagpot
Thomo
Soekmekaar
Malamulele
Tshikeweta
Tabor
Spencer
Hlanganani
Venulu
Muledani
Flurian
Louis Trich
ParadiseNjeleleT
Soutpan
Pontdrif
Leeudraai
Sanari
Makonde
Bochum
Venetia
Messina
Botlokwa
Witkop
Giyani
Ribolwa
Mageva
Phugwane
Mhinga
Mashau
Singo
RioTinto CoalTshilambaMakhado Coal
Mandala
Thulamela
2011/12
2012/132011/12
2013/14
2013/14
2015/16
2015/16
2013/14
Mamaila
2011/12
2011/12
2012/13
New MTS
Dendron
Mbahe
Bulk Infrastructure Development
Thohoyandou
TzaneenPolokwane
Limpopo Bulk Infrastructure: 2010-2015
Item Project Name Municipality Scope
1 Singo Substation Makhado 2 x 20MVA Substation 132/22kV 37kM 132kV Line – Kingbird
2 Mashau substation Makhado 2 x 20MVA Substation 132/22kV 250M 132kV Line – Kingbird
3 (Jilongo ) Phugwane substation
Thulamela 2 x 20MVA Substation 132/22kV 35kM 132kV Line – Kingbird
4 Lambani (Mhinga) Substation
Thulamela 2 x 20MVA Substation 132/22kV 30kM 132kV Line – Kingbird
5 Mbahe Substation Thulamela 2 x 20MVA Substation 132/22kV 2kM 132kV Line – Kingbird
Limpopo Bulk Infrastructure: 2010-2015
Item Project Name Municipality Scope
6 Tshilamba Substation
Mutale 2 x 20MVA Substation 132/22kV 10kM 132kV Line – Kingbird
7 Mamaila Substation
Greater Letaba 2 x 20MVA Substation 132/22kV 16kM 132kV Line – Kingbird
8 Mageva Substation Greater Letaba 2 x 20MVA Substation 132/22k 37kM 132kV Line – Chickadee
9 Mamatsekele Substation
Lepelle Nkumpi 2 x 20MVA Substation 132/22kV 37kM 132kV Line – Kingbird
10. Rampheri Substation
Polokwane 2x10MVA Substation 132/11kV 30kM 132kV Line – Kingbird
CHALLENGES
• Land acquisition for infrastructure projects
• Significant footprint of Protected trees
• Illegal connections
• resulting in overloaded networks
• Public fatalities (Bambamenchies; KaMhlushwa)
• Maintaining good technical performance of the network – balance service extension with network strengthening; refurbishment as well as normalisation
• Equipment theft: cables and transformers
CONCLUSSION
• Electrification requires focus from a financial and technical perspective in order to optimise costs and reach a bigger footprint
• The industry must work together to implement available technologies for access to energy
• Solutions for electrification should be custom made to avoid over and/or under-designs
• Harmonisation between DoE & Human settlements
• Eskom supplementary funding of infill connections and some infrastructure projects
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