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43-2000  -  IEEE Recommended Practice for Testing Insulation Resistance of Rotating Machinery

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This document describes the recommended procedure for measuring insulation resistance of armature and field windings in rotating machines rated 1 hp, 750 W or greater. It applies to synchronous machines, induction machines, DC machines, and synchronous condensers. Contained within this document is the general theory of insulation resistance (IR) and polarization index (PI), as well as factors affecting the results, test procedures, methods of interpretation, test limitations, and recommended minimum values.