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A closer look at high potential testing of rotating electrical machine windings

Publication date: 
August 2003
Tom Bishop, P.E., EASA Senior Technical Support Specialist
Type of media: 

A frequent question that arises during repair or maintenance is how much voltage to apply when performing a high potential test. The test voltage for a new winding will be higher than that of a winding that has been in service, but what is the appropriate test voltage? Seeking answers to this question can sometimes lead to confusion. Our goal in this article is to clarify high potential testing and test voltages.

Motor testing