High Voltage interruptions and causes
|14 July - 21 July 2014||From 1|
Number of high voltage interruptions
Cause of interruption
% of total
% of total
Weather (including lightning, vegetation, wind blown debris)
|Third Party (for example vehicles hitting SA Power Networks equipment, vandalism, tree felling, our underground cables being damaged during excavation by external parties)||10%||5%|
|Operational (for safety reasons our equipment is set up to act like a residential safety switch. The system 'trips' when something abnormal has caused it to flash over ie unexpected electrical or mechanical transients)||4%||2%|
|Animals (for safety reasons our equipment is set up to act like a residential safety switch. The system 'trips' when something abnormal has caused it to flash over, ie birds, possums, rats and other animals)||4%||6%|
|Equipment (when our equipment has been damaged and needs to be repaired)||22%||25%|
|Unknown (is when the cause is inconclusive at the time of the report, the cause may be determined at a later date, or there is no evidence of the cause i.e. a transient fault)||17%||28%|
|Other (causes that do not fit into the above categories e.g. customer's plant, other faults that cause SA Power Networks equipment to operate)||27%||7%|
- This is preliminary data only and is based on the number of events that have occurred.
- Official figures are published in ESCOSA's Quarterly and Annual Operational Performance Reports.
- Data does not include Low Voltage interruptions.
- Data does not include planned interruptions.
- Data does not include momentary interruptions (i.e. interruptions of duration less than 60 seconds).