This application guide assists in the understanding, selection, and operation of tap-changers designed in accordance with the latest IEEE C57.131 and IEC 60214 Part 1 standards which include both resistor and reactor types, de-energized tap-changers, and their associated equipment. It applies for use with the tapped windings of power and distribution transformers of all types and reactors. It applies to tap-changers immersed in mineral insulating oil, air or gas insulation or other insulating liquids if applicable. It applies to tap-changers with arcing and arcing-free contacts depending on the application.
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