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Full Description

Scope

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 insulations. 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, thereefore, 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 insulations. 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.

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 hotspot temperatures are 105¿¿C, 130¿¿C, 155¿¿C and 180¿¿C respectively.

Abstract

Revision Standard - Superseded.
 

Document History

  1. IEEE 275-1992


    IEEE 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

    • Most Recent
  2. IEEE 275-1981


    IEEE 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

    • Historical Version
  3. IEEE 275-1966

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    IEEE Proposed Test Procedure for Evaluation of Systems of Insulating Materials for A-C Electric Machinery Employing Form-Wound Preinsulated Stator Coils for Machines Rated at 50 to 2000 horsepower 35 to 1500 Kilowatts mechanical output and below 6600 volts

    • Historical Version