Answer / vitthal upare

Its depends upon healthyness of earthing and nuetral. for
good earthing there should be minimum voltage drop between
earth and nuetral.
So from above example its clear that neutral or earthing of
Transformer not proper. It can be check by earth tester

Answer / sridhar

loose connection in Earth Bus must be checked , Often
Earthing is neglected

Answer / pillay

If your intake is small and direct from the electric board
than it is normal ,that means the neutral of the power
supply board is is not so good, but when you transfer to DG
the neutral and earth which is within your control is
better earthed. If your intake is HT and through a
transformer than likely your transformer neutral earthing
or the neutral route is in question.

there is a power transformer 66/11kV in delta-delta connection has 5 feeder coming out from the secondary side. One of the feeder in it normally loaded (loaded than other feeder)and this feeder usually trips with double OCR causing the bank transformer to trip. Now if the load of this feeder is put on other transformer then that no problems occurs on that transformer or the load. However normally all the test(IR, PI, short ckt, open ckt,grounding test and other ) has been conducted for this but evertything transformer..... I am not geting what is the actual problem...

2 Answers  

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