Full Description
Scope
This recommended practice outlines test procedures for comparing two or more unsealed or sealedinsulation systems in accordance with their expected life at rated temperature. The procedure is limited to insulation systems for AC electrical machines using form-wound pre-insulated stator coils rated 15 000 V and below.The intent of this test procedure is to evaluate unsealed insulation systems for use with air cooling under usual (normal) service conditions, or sealed insulation systems for use under severe environmental conditions (where the insulation is exposed to conducting contaminants). This procedure does not cover special requirements, such as those for machines enclosed in gas atmospheres or machines subjected to strong chemicals, metal dust or submersion in liquid, etc.The procedure includes instructions for testing candidate systems in comparison with known referencesystems, of the same type, having a proven record of service experience and interpreting the results of these tests. The intent of this test procedure is to evaluate unsealed insulation systems for use with ir cooling under usual (normal) service conditions, or sealed insulation systems for use under severe environmental conditions (where the insulation is exposed to conducting contaminants).This procedure does not cover special requirements, such as those for machines enclosed in gas atmospheres or machines subjected to strong chemicals, metal dust or submersion in liquid, etc.The procedure includes instructions for testing candidate systems in comparison with known reference systems, of the same type, having a proven record of service experience and interpreting the results of these tests.
Purpose
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¿¿¿-1992 (for unsealed systems) with thoseof IEEE Std 429¿¿¿-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.
Abstract
New IEEE Standard - Active.A test procedure (Combination of IEEE Std 275¿¿¿-1992 and IEEE Std 429¿¿¿-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 15000 V and below
