Answer Posted / simon peter
Its an electrical demerit which occurs during transmission on of Extra High Tention (EHT).It has very high voltage but low current (I).This transmission is done only of 3 phase (R,Y,B) or its multiples.
due to +ive charge(Phase supply) ,-ve charge mostly in rainy season of atmosphere .A electrostatic pull/attraction is created (OPP CHARGE)which results in humming sound or minute sparkling can b seen on the wire its known as corona effect.
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