CORONA
It is defined as the ionisation of air surrounding the power conductor due to electrons normally present in free space because of radio activity & cosmic rays.
It is self sustained electric discharge in which the field intensified ionization is localized only over a portion of the distance between the electrodes.
Following Phenomenon Occurs
It is defined as the ionisation of air surrounding the power conductor due to electrons normally present in free space because of radio activity & cosmic rays.
It is self sustained electric discharge in which the field intensified ionization is localized only over a portion of the distance between the electrodes.
Following Phenomenon Occurs
- A gaint glow around conductors.
- Acoustical noise.
- Vibration in conductor.
- Ozone & Oxides of Nitrogen produce.
- Power loss
- Radio interference.
Factor Affecting Corona
- Conductor surface gradient.
- Surface condition.
- Atmospheric condition.
- Frequency & Wave form of supply
- Air density factor = 0.392/ 273+t
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