Methods to reduce corona Loss in Power System

Critical breakdown voltage of the corona can be increased by following ways:

• By increasing the spacing between the transmission line conductors. However the spacing between the lines cannot be increased very much as this effects the size of the tower, weight of the supporting structures and the land occupied by the tower.Hence the distance between the conductors should be chosen optimum so that the critical breakdown voltage increases.
• Other factor on which the critical breakdown voltage is diameter of the conductor. By increasing the diameter of the conductor breakdown  voltage of the corona can be increased. The increase in the conductor diameter results in reduction of the electric field intensity which reduces the corona. Hence hollow conductors are employed for reducing the corona in EHV lines.



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• By using the bundled conductors the diameter of the conductor increases compared to diameter of the normal conductor for same power rating. Increase in the conductor diameter reduces the electric field intensity. Hence corona loss can be reduced.

In simple corona can be reduced by increasing the distance between the current carrying conductors, increasing the diameter of the conductors (employing Hollow conductors) and by using Bundled conductors corona loss can be reduced or minimized.