hi-pot testing of 4500 HP electric motor
hi-pot testing of 4500 HP electric motor
(OP)
While hi-pot testing a 4500 HP motor, it was noted that there was considerable "popping and cracking" noted and I could visibly see arcs jumping throught the front end of the rotor to the stator. The operator stated this was "normal and, as long as the hi-pot machine didn't trip, was acceptable. Any thought???





RE: hi-pot testing of 4500 HP electric motor
For new/rewound windings, audible corona (like a steady rain) is ok but visible corona is not ok.
For old stator windings, visible corona indicates failing stress-grading system in the end winding and nothing can be done about it till the next rewind.
RE: hi-pot testing of 4500 HP electric motor
RE: hi-pot testing of 4500 HP electric motor
RE: hi-pot testing of 4500 HP electric motor
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RE: hi-pot testing of 4500 HP electric motor