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New IEEE Standard - Superseded.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