Corona :
Due to maximum electric field density near surface of conductor the surrounding air get ionized and this is called Corona Effect.
Difference between corona and sparking?
Corona is partial breakdown of air particles.
Sparking is complete breakdown of air particles.
Disadvantages of Corona:
Due to corona
Hissing sound produced in transmission line.
Radio interference (3rd Harmonic).
Power loss.
Advantages of Corona :
Reduce the magnetic surge.
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