1. (a), (b) and (c):
All substations within Ekurhuleni, including all electricity distribution equipment, are earthed in accordance with the standard design and engineering standards applicable to the relevant equipment.
2. Maintenance work is carried out in terms of the department’s approved maintenance plan which inter alia includes the following:-
PRIMARY SUBSTATION INSPECTIONS |
SECONDARY SUBSTATION INSPECTIONS |
MINIATURE SUBSTATION INSPECTIONS |
KIOSK INSPECTIONS |
BATTERY INSPECTIONS |
TRANSFORMER TAPCHANGER MAINTENANCE |
INFRA RED SCANNING |
CABLE SHEATH TESTING |
CABLE OIL PRESSURE READINGS |
OIL SAMPLING |
OVERHEAD LINE INSPECTIONS |
PRIMARY SUB - INTRUSIVE MAINTENANCE |
SECONDARY SUB - INTRUSIVE MAINTENANCE |
MINIATURE SUBSTATION INTRUSIVE MAINTENANCE |
FOLLOW UPS - HIGH PRIORITY |
FOLLOW UPS - MEDIUM PRIORITY |
FOLLOW UPS - LOW PRIORITY |
OVER INSPECTIONS |
PRIMARY SUB CLEANING |
NETWORK OPTIMIZATION |
3. Copy of the maintenance plan is attached to this response Annexure A.
(4) The Municipality has the instruments to measure the gas levels since gas filled equipment, for example circuit breakers, where installed in substations, are equipped with gas pressure monitoring instrumentation when purchased. These instruments are inspected as per the maintenance plan to ensure that the pressures are correct.
(a) Not applicable
(b) Not applicable
(c) The circuit breakers filled with Sulphur Hexafluoride gas (SF6) are equipped with gas monitoring instruments fitted to them
(i) The estimated number of substations that have SF6 filled circuit breakers are 51. These are mainly the Primary Substations.
(ii) The estimated number of circuit breakers filled with SF 6 gas monitoring equipment are 419.
NW760E