IEEE C57.12.56-1986

IEEE C57.12.56-1986 IEEE Standard Test Procedure for Thermal Evaluation of Insulation Systems for Ventilated Dry-Type Power and Distribution Transformers
standard by IEEE, 10/03/1986

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Full Description

Scope

This standard is intended to establish a uniform method for determining the temperature classification of ventilated dry-type power and distribution transformer insulation systems by test rather than by chemical composition. These insulation systems are intended for use in transformers listed in ANSI C57.12.50-1981 [1] and ANSI C57.12.51-1981 [2], and whose highest voltages exceed nominal 600 V.NOTE -- In this standard, the term transformer shall be considered to mean ventilated dry-type transformer unless qualified by other descriptive terms.

Purpose

The purpose of this standard is to establish a uniform method1) For providing data for selection of the temperature classification of the insulation system2) For providing data which may be used as a basis for a loading guide3) For comparative evaluation of different insulation systems

Abstract

New IEEE Standard - Superseded.This IEEE Standards product is part of the C57 family on Power Distribution and Regulating Transformers. A test procedure for determining the temperature classification of ventilated dry-type power and distribution transformer insulation systems by test rather than by chemical composition is established. The intent is to provide a uniform method for providing data for selection of the temperature classification of the insulation system, for providing data that may be used as a basis for a loading guide, and for comparative evaluation of different insulation systems. Voltage-withstand endpoint criteria are related to the impulse voltage distribution within the coil or to the initial voltage-withstand of the coil. A relationship between impulse withstand of the insulation and short-term 60-Hz-withstand is identified so that 50/60--Hz testing of model coils is possible.