Identify test conditions, instrumentation, data collection and calculations that are essential to be able to establish pass or fail conditions for the manufacture of de-energized tap-changers such that they can be expected to have long and stable life.This Guide provides the requirements and recommended testing methods for performing an accelerated life test for de-energized tap changers, dual voltage switches, reversing switches of on-load-tap-changers and other products for distribution and power transformers, containing electrical contacts in liquid filled chambers.
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