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IEEE 56 2016 Edition, September 22, 2016
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Guide for Insulation Maintenance of Electric Machines
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This insulation maintenance guide is applicable to rotating electric machines rated from 35kVA and higher. The procedures detailed herein may also be useful for insulation maintenance of other types of machines.

Purpose

The purpose of this guide is to present information necessary to permit an effective evaluation of the insulation systems of rotating electrical machines. Such an evaluation can serve as a guide to the degree of maintenance or replacement as might be deemed necessary, and also offer some indication of the future service reliability of the equipment under consideration