IEEE Recommended Practice for Thermal Evaluation of Unsealed or Sealed Insulation Systems for AC Electric Machinery Employing Form-Wound Pre-Insulated Stator Coils for Machines Rated 15 000 V and Below

A test procedure (Combination of IEEE Std 275
^TM
-1992 and IEEE Std 429
^TM
-1994) for comparing two or more insulation systems in accordance with their expected life at rated temperature is outlined. The procedure is limited to insulation systems for alternating-current (AC) electrical machines using form-wound pre-insulated stator coils rated 15 000 V and below.