High Voltage interruptions and causes

 31 Mar - 07 April 2014From 1
January 2014

Number of high voltage interruptions

401083

Cause of interruption

% of total

% of total

Weather (including lightning, vegetation, wind blown debris)

10%29%
Third Party (for example vehicles hitting SA Power Networks equipment, vandalism, tree felling, our underground cables being damaged during excavation by external parties)5%3%
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)3%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)10%6%
Equipment (when our equipment has been damaged and needs to be repaired)26%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 ie a transient fault)33%29%
Other (causes that do not fit into the above categories eg customer's plant, other faults that cause SA Power Networks equipment to operate)13%6%

 

Notes

  1. This is preliminary data only and is based on the number of events that have occurred.
  2. Official figures are published in ESCOSA's Quarterly and Annual Operational Performance Reports.
  3. Data does not include Low Voltage interruptions.
  4. Data does not include planned interruptions.
  5. Data does not include momentary interruptions (ie interruptions of duration less than 60 seconds).