Answer / 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

Answer / hardik bhesaniya

Corona is a effect of Extra High Voltage either due to switching over voltage or sue to lightning over voltage. The role of the corona ring is to distribute the electric field gradient and lower its maximum values below the corona threshold, preventing corona discharge.

Answer / prashant singh

because corona is generated in out side, it meanse through
out the atmospheare, so we use corona ring in out door
switchyard. if we will know abought the corona so we can
give easily of this question.

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