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| 22 February - 01 March 2010 |
From 1st January 2010 |
|
|---|---|---|
|
Number of high voltage interruptions |
72 | 537 |
|
Cause of interruption |
% of total |
% of total |
|
Weather (including lightning, vegetation, wind blown debris) |
46% | 21% |
| Third Party (for example vehicles hitting ETSA Utilities equipment, vandalism, tree felling, our underground cables being damaged during excavation by external parties) | 8% | 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) | 6% | 3% |
| 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) | 7% | 8% |
| Equipment (when our equipment has been damaged and needs to be repaired) | 17% | 22% |
| 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) | 14% | 35% |
| Other (causes that do not fit into the above categories eg customer's plant, other faults that cause ETSA Utilities equipment to operate) | 3% | 6% |