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IEEE C57.12.56-1986

IEEE Standard Test Procedure for Thermal Evaluation of Insulation Systems for Ventilated Dry-Type Power and Distribution Transformers
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IEEE C57.12.56-1986

IEEE Standard Test Procedure for Thermal Evaluation of Insulation Systems for Ventilated Dry-Type Power and Distribution Transformers

PUBLISH DATE 1998
PAGES 20
IEEE C57.12.56-1986

New IEEE Standard - Superseded.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,
  • Providing data that may be used as a basis for a loading guide, and
  • 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.

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.

The purpose of this standard is to establish a uniform method

  • For providing data for selection of the temperature classification of the insulation system
  • For providing data which may be used as a basis for a loading guide
  • For comparative evaluation of different insulation systems
SDO IEEE: Institute of Electrical and Electronics Engineers
Document Number C57.12.56
Publication Date Sept. 16, 1998
Language en - English
Page Count 22
Revision Level
Supercedes
Committee Transformers
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