A no-load tap changer, also called a de-energized tap changer (DETC), allows changing the turns ratio of a transformer to adjust the output voltage. The procedure requires the transformer to be completely de-energized and isolated from the power system. First, verify that the transformer is de-energized. This involves opening all circuit breakers and switches connected to both the primary and secondary sides of the transformer, and confirming zero voltage on both sides using a voltmeter. Apply proper Lockout/Tagou....
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