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Answer Posted / sulagna das
When a high or extra high voltage transmitted in a
transmission line as long as the air is subjected to a uniform electric field intensityof peak value less than 3×10⁶V/m,the flow of current between the two conductors of the line is negligible for practical purposes.but when the Electric field intensity(voltage gradient) reaches reaches this critical value(3×10⁶V/m),the air in immediate vacinity of conductor surface becames conducive and looks bluish or violet and due to dielectric breakdown of air and vibrating tendency of conductor a hissing noise comes out,it is Called as CORONA.
Due to corona OZONE and OXIDE OF NITROGEN formed on the outside surface of the
Conductor,there is a loss of power,there is a radio interferrence and a faint glow appeares around the conductor which is visible in dark.The effect of this to the power system is known as CORONA EFFECT.
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