Description: In this standard a test procedure for comparing two or more insulation systems in accordance with their expected life at rated temperature is described. The procedure is limited to insulation systems for AC electric machines using form-wound preinsulated stator coils and rated 6900 V and below. This procedure is intended to evaluate insulation systems for use in usual service conditions with air cooling. The procedure includes instructions for testing candidate systems in comparison with known systems having a proven record of service experience and interpretation of the results.
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