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Corona takes place in a HT line when neutral atom or molecule in a strong electric field is ionized. Happening so positive ion and free electron created around the conductor and the conduction takes place through air between conductor of HT line.
It causes the power loss in line, audible noise, electromagnetic interference, purple glow, ozone production and insulation damage of the insulating medium.
Coronas can generate audible and radio-frequency noise, particularly near electric power transmission lines. They also represent a power loss, and their action on atmospheric particulates, along with associated ozone and NOx production, can also be disadvantageous to human health where power lines run through built-up areas. Therefore, power transmission equipment is designed to minimise the formation of corona discharge.
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