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Dear Sirs,
I am a technical persons.In one of our Electrical Sub-
Station, We have installed three numbers of
1250KVA ,11KV/0.415KV Transformer to feed the Factory load.
We have found some abnormality. In one of our Transformers
the leakeage current from transformer body to earth through
earth continuity wire is almost 86 Amp but in other
transformer it is (5-10)Amp. where the load current on
three phase and neutral are respectively
1360Amp,1400Amp,1370 Amp & 176Amp. So please any technical
person help me about the reasons of this situation and how
I can rectify the fault. Moreover,I have measured the earth
resistance of the Earth continuity wire which is less than
1 Ohm.
Thanks
Tapas Barua
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Answer Posted / k.prakashchandra
Check the insulation resistance of No. 1.Connect a voltmeter
between body and the earth and measure the leakage voltage
which is expected to be more 86V.Unbalanced currents are
also due to contact resistance .
| Is This Answer Correct ? | 0 Yes | 1 No |
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