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IEEE 275

Proposed Test Procedure for evaluation of SYSTEMS OF INSULATING MATERIALS FOR A-C ELECTRIC MACHINERY EMPLOYING FORM-WOUND PREINSULATED STATOR COILS

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Organization: IEEE
Publication Date: 1 December 1966
Status: inactive
Page Count: 8
scope:

Purpose

The chief purpose of this Test Procedure is to classify insulation systems in accordance with their temperature limits by test, rather than by chemical composition. The intention is to classify according to the recognized A, B, F and H categories, whose usual continuous hot-spot temperatures are 105 C, 130 c, 155 C and 180 C respectively.

Other insulation systems may then be compared to service-proven systems under similar test conditions. Data from such test may be used to establish the temperature classification of new insulation systems before they are service proven. The concepts implemented herein are based on IEEE No.1 (formerly AIEE No. 1, December, 1962).

A wide variety of synthetic electrical insulating materials are available for application in electric machinery and apparatus. Included in these materials are the silicones, fluorocarbons, wire enamels, new films, rubbers and varnishes. As there is a growing tendency to either rely solely on these materials as electrical insulation, or to employ them with the old familiar materials in novel combinations, there is a corresponding increase in the problems associated with the selection and evaluation of insulation. Frequently an insulation "system" or combination of insulation materials must be evaluated rather than one insulating "material."

Many of the specifications regulating the use of insulation materials were written before the advent of the newer synthetics and were based upon experience gained with the old materials over a long period of time. Difficulties arise, therefore, when an effort is made to classify these new materials or combinations for insulation purposes under the USA Standards as Class A, Class B, Class F or Class H insulation.

This Test Procedure has been prepared to outline useful procedures for the evaluation of systems of insulation for form-wound rotating electric machines. It is expected that the several insulating materials, or components, making up any insulation system to be tested will first be screened in accordance with specific test procedures for each type of material.

This Procedure is intended to evaluate insulation systems for use in usual service conditions with air cooling. It does not cover such special requirements as machines enclosed in gas atmospheres, subjected to strong chemicals, to metal dusts or to submersion in liquids, etc.

Document History

January 1, 1992
Recommended Practice for Thermal Evaluation of Insulation Systems for Alternating-Current Electric Machinery Employing Form-Wound Preinsulated Stator Coils for Machines Rated 6900 V and Below
This standard outlines a test procedure for comparing two or more insulation systems in accordance with their expected life at rated temperature. The procedure is limited to insulation systems for ac...
May 15, 1981
RECOMMENDED PRACTICE FOR THERMAL EVALUATION OF INSULATION SYSTEMS FOR AC ELECTRIC MACHINERY EMPLOYING FORM-WOUND PRE-INSULATED STATOR COILS MACHINES RATED 6900 V AND BELOW
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IEEE 275
December 1, 1966
Proposed Test Procedure for evaluation of SYSTEMS OF INSULATING MATERIALS FOR A-C ELECTRIC MACHINERY EMPLOYING FORM-WOUND PREINSULATED STATOR COILS
Purpose The chief purpose of this Test Procedure is to classify insulation systems in accordance with their temperature limits by test, rather than by chemical composition. The intention is to...
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