Answer Posted / sunil guru

corona is the function of partial discharge of air near the surface of the conductor due to high voltage (in kv) and high voltage above rated is possible only due to switching over voltage or lightning over voltage so the corona ring is provided near switch yard lightning arrestor

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PLEASE SEND ME NTPC RELATED INFORMATION LIKE WHICH TOPICS HAV MORE SCOPE,BOOKS TO READ,CUT OFF...PLEASE.mail at thiru.1203@gmail.com

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