High voltage interruptions and causes
|27 September - 04 October 2021||From 1 January 2021|
|Number of high voltage interruptions||51||1921|
|Cause of interruption||% of total||% of total|
|Weather (including lightning, vegetation, wind blown debris)||22||25|
|Third Party (for example vehicles hitting SA Power Networks equipment, vandalism, tree felling, our underground cables being damaged during excavation by external parties)||4||8|
|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)||0||1|
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)
|Equipment (when our equipment has been damaged and needs to be repaired)||28||29|
|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)||24||21|
|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)||8||5|
- 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
- planned interruptions
- momentary interruptions (ie. a momentary interruption is now a duration of 3 minutes or less).