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High potential (Hipot) tests have long been used by many on machine stator windings to assess the integrity of electrical insulation system in question. Most industrial standards limit those recommended test values on completed new machines ready for service or existing machines under service/maintenance conditions. There is only limited information available in the literature regarding tests done...
One of the quality control methods to evaluate stator insulations, especially those for high voltage applications, is the so called dark (blackout) test. The main purpose of such test is to confirm whether those stator windings would be free of external discharges during normal operations. Dark test is typically done by placing stator winding in a totally darkened room with all visible lights blocked...
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