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Should I fail this transformer?

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  1. Join Date
    Aug 2018
    Quote Originally Posted by cjones09 View Post
    So today I re did the test and the problem was not the test leads but the jumper cables I was using to short the windings together. I did the test without the jumpers and the readings went to full scale. Most PI values were well over 4. I've been taught that jumpers help reduce voltage stress on the windings but it clearly has a big effect on the readings.
    Where did you find the information on jumpers reducing stress on the insulation when performing a IR/PI test? I could understand AC when energizing these windings, but not so much on a DC test since there is very little resistance between each phase winding.

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