ADVANTAGES AND DISADVANTAGES OF CORONA
Advantages
- It acts as a safety valve by reducing the magnitude of high-voltage steep-fronted waves that may be caused by lightning or power switching.
- With the formation of corona, the air surrounding the conductor becomes conductive and there is a virtual increase in the effective diameter of the conductor. Due to increased diameter, the maximum voltage gradient between the conductors is reduced.
Disadvantages
- Transmission efficiency is affected due to corona loss. Even under fair weather conditions some loss is encountered.
- Inductive interference to neighboring communication lines due to the non-sinusoidal voltage drop that occurs in the line.
- With the appearance of the corona glow, the charging current increases because the corona introduces harmonics.
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