Kwadukuza IDP 2011 - KZN Development Planning

• The assessment of the infrastructure has determinedthat the age and condition of the majority of DC-Battery Charges and Batteries installed at majorsubstations and switch rooms now poses a great riskto the correct functioning of equipment protectivedevices. The DC-supply is used to energize theprotection relays and control the tripping/ closingcoils on all the 33 and 11 kV breakers.• There is a need for calibration of all 33 and 11 kVbreakers protection relays. The phenomenal growththat KwaDukuza Municipality has experienced overthe past three years has caused overload situationson various 33KV feeders. The said conditions havecaused ESKOM supply/protection relays to operateand caused the ESKOM supply to trip. On manyoccasions faults have passed through Council’sprotective devices with resultant fault trip on ESKOMsupply side.• Customer growth within the Northern networkrequires the Municipality to upgrade the 33 kVnetwork between ESKOM/Stanger point of supplyand Glenhills substation, from 19 MVA to 30MVAcurrent carrying capacity. This upgrade is essential soas to provide an alternate 33 kV supply source to theLavoipierre substation, via the ring circuit connectingthrough Industrial Area substation back to Glenhillssubstation.• In the event the cables between Point of SupplyIntake substation and Lavoipierre substation fail theexisting Oak conductor (19 MVA) connected betweenGlenhills and ESKOM Point of Supply Intake substationis not sufficiently rated to carry the transferred load. Itis therefore essential that this conductor be upgradedto Poplar conductor (30 MVA) capacity. This will costCouncil an estimated amount of R 1,760,000must be constructed in the Groutville/Priority One area as ahigh priority. The estimated cost for the construction of thenew Groutville/Priority One substation is R14, 500,000.The current Budget makes provision for R11, 730,000 inthis regard.• To release excessive load on 11 kV overhead lines/ feeders,supplied from Glenhills substation, it has been identifiedthat as an interim measure, until such time that the newGroutville/Priority One 33/11 kV substation has beenestablished, the 33 kV overhead line feeder betweenShakaskraal substation and Stanger Point of Supply, bechanged over from 33 kV supply to 11 kV supply and thatthe said overhead line be connected via 11 kV cables intothe Groutville/Priority One Switching Station.• This network upgrade will provide for greater security ofsupply to the Priority One area and will also serve as alimited back up supply to Glenhills substation in the eventof a transformer failure.• In the event of failure at Glenhills substation thisinterconnector 11 kV supply will also provide an alternatesupply source to the uMvoti Water Works. Council hasmade provision for this process of down rating the 33kV to 11 KV and allocated R400, 000 in its 2010/2011Adjustment Budget.• To release excessive load on the existing 11 kV feedercables, supplied from Lavoipierre Substation, the NetworkMaster Study confirms that new 11 kV SwitchingStations (Nodal Switch Room), require to be established/constructed, within the KwaDukuza CBD area, Saundersstreet Reservoir and Hesto Harnesses areas. It is proposedto ultimately interconnect the CBD Switch room viaSaunders Street switch room with Glenhills substation.• In order to release excessive load on 11 kV overheadlines/ feeders supplied from Glenhills substation, ithas been established that a new 33/11 kV substation68KwaDukuza Municipality Integrated Development Plan - 2011/16