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| 23-30 January 2012 | From 1 January 2012 |
|
|---|---|---|
|
Number of high voltage interruptions |
99 | 352 |
|
Cause of interruption |
% of total |
% of total |
|
Weather (including lightning, vegetation, wind blown debris) |
28% | 30% |
| Third Party (for example vehicles hitting ETSA Utilities equipment, vandalism, tree felling, our underground cables being damaged during excavation by external parties) | 4% | 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) | 0% | 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) | 5% | 7% |
| Equipment (when our equipment has been damaged and needs to be repaired) | 25% | 23% |
| 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% | 31% |
| Other (causes that do not fit into the above categories eg customer's plant, other faults that cause ETSA Utilities equipment to operate) | 5% | 4% |