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IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery
Revision Standard - Inactive-Reserved.
The dc voltage tests procedures for the measurement of the insulation resistance and polarization index of insulated stator, and rotor windings and how to interpret the results are described in this recommended practice.
This document describes a recommended procedure for measuring insulation resistance of armature and field windings in rotating machines rated 750 W or greater. It applies to synchronous machines, induction machines, dc machines, and synchronous condensers. It does not apply to fractional-horsepower machines.
The document also describes typical insulation resistance characteristics of rotating machine windings and how these characteristics indicate winding condition. It recommends minimum acceptable values of insulation resistance for ac and dc rotating machine windings.
Other IEEE standards that include information on insulation resistance measurement are listed in Clause 2.
The purpose of this recommended practice is to address the following:
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