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An 11kv system consisting of an underground cable to a sub
station about 300 meters away was shut down for about 10
hrs. On energising, it tripped off on earth fault about
10---20 mins later 6 times but since than it is not
tripping.its already 3 weeks now. The SPAJ was found to be
fine. what could be the cause.No test had been done to
determine the cause of the trippings till now because of
demand.
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Answer Posted / pillay
thanks but I had managed to ON the system and remained
energized with some load for a few minutes (10 -20 mins)
before it tripped again on earth fault , it happened 6 times
on (4/6/2011) and till today (13/07/2011) no problem. we
are using ABB spaj oc/ef relay.
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