Corona is the ionization of air surrounding the power conductor due to the electrons normally present in free space because of radio activity and cosmic rays. Corona is the self sustained electric discharge in which the field intensified ionization is localized only over portion of the distance between the electrodes.
For maintaining the motion of charges produced by electric field, the energy required is derived from the supply system. In order to maintain the flow of energy over the conductor in the field where in this additional energy would have been otherwise absent, it is necessary to supply this additional loss from the supply system. This is referred to as corona effect.
Factors Affecting Corona Loss:
* Electrical Factors.* Atmospheric Condition.
* Factors connected with conductors.
* Number of conductors/Phase.
* Profile of conductors.
Methods of Reducing Corona:
* Conductors having large diameters.
* Hollow conductors.
* Bundled conductors.
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