To electricpete
Yes I go to LEMUG, are you going in August?
I think we are dancing around the whole PI issue here. Hypress was looking for a good PI acceptance number for a new, unused motor. The ones he tested seemed to be high. Moisture seemed to be a possibility, especially for a modern...
To Electricpete.
I would agree that suspecting moisture due to a high PI for a modern winding would be a departure except the initial conditions were: new motors, never in service. I assumed storage of some kind, and while dirt, contamination, and deterioration and other normal enemies of...
I agree with utvol, the PdMA tester is a good tool. My first question would be what is the resistance to ground and how quickly does it get there. If the resistance to ground exceeds 5 gigohms in the first minute and stays there througought the 10 minute test with a good smooth curve, then the...