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During the main stator winding insulation testing (phase to ground)of 11kv alternator (Lerysomer) i found 0 and resistance with multimeter and found 20 killo ohm while the power cables are connected both end (Generator & VCB). In VCB PT (Potential transformer) are connected.
Please any body explain that method of insulation is correct or not? also describe of PT connections
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Answer Posted / k.prakashchandra
Supposing that you have disconnected the neutral of GEN , you will measure the dc resistance of PT as the other end of it is earthed . 20 K ohm will be measured as 0 M ohm by the megger . If you want to test insulation of GEN , you have to isolate the winding from everything .
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