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1776 - 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

The purpose of this procedure is to classify unsealed or sealed insulation systems for the machinery used inusual (normal) service or machinery used in severe environmental conditions (and falling within the scope of this recommended practice) in accordance with their temperature capabilities by test, rather than by chemical composition. Data from such tests may be used to establish the temperature classification of new insulation systems before they are service-proven. In order to provide data from which a base of reference for temperature classification can be established, service-proven (reference) unsealed or sealed systems should also be tested according to this test procedure. This document combines the procedures given in IEEE Std 275(TM)-1992 (for unsealed systems) with those of IEEE Std 429(TM)-1994 (for sealed systems).1In order to provide data from which a base of reference for temperature classification can be established, service-proven (reference) unsealed or sealed systems should also be tested according to this test procedure. This document combines the procedures given in IEEE Std. 275-1992 (unsealed systems) with those of IEEE Std. 429-1994(sealed systems). Both of these recommended practices have been withdrawn.
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