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IEEE C57.157
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IEEE C57.157 2015 Edition, October 26, 2015 Guide for Conducting Functional Life Tests on Switch Contacts Used in Insulating Liquid–Immersed Transformers
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Description / Abstract:
This guide is intended for use in establishing a methodology to
evaluate expected long-term performance of infrequently operated
switch contacts used within insulating liquid–immersed
transformers. These switch contacts are typically found in
de-energized tapchangers, dual voltage switches, reversing
switches, on-load tapchangers, and step-voltage regulators, but the
test might possibly be used to evaluate any contact that is used in
insulating liquids with similar operating characteristics and
within similar environments.
Purpose
This guide outlines a test method to simulate long-term life (minimum 30 years) of a de-energized tapchanger in a period of 30 test days by using a combination of elevated liquid temperatures in conjunction with cyclically elevated load currents. The test is performed on specific switch bodies with specific contact materials, geometries, and contact pressures in liquid baths so as to closely parallel conditions found in actual operation. The variable that provides the accelerated life simulation is the switch contact temperature.
Purpose
This guide outlines a test method to simulate long-term life (minimum 30 years) of a de-energized tapchanger in a period of 30 test days by using a combination of elevated liquid temperatures in conjunction with cyclically elevated load currents. The test is performed on specific switch bodies with specific contact materials, geometries, and contact pressures in liquid baths so as to closely parallel conditions found in actual operation. The variable that provides the accelerated life simulation is the switch contact temperature.