TransGrid warned over 27 September 2009 Sydney East A2 132kV busbar. |
First 4 of 4 paragraphs shown On 27 September last year at 1607 hrs, an unplanned outage of the Sydney East A2 132kV busbar occurred. Restoration of the busbar was initiated at 2125 hrs: The busbar was energised, but as soon as the Sydney East 132kV bus section circuit breaker between A2 and A3 132kV busbars was closed, the busbar tripped again at 2136hrs. The cause: AEMO says the trips were caused by isolated current transformer secondary circuits during previous protection maintenance work on the adjacent busbar. TransGrid has reviewed the incident with the staff involved and reviewed its protection isolation/restoration procedures to minimise similar occurrences in future. ...Log in to read rest of Article or image. |