Methods of reducing corona effect
It has been seen that intense corona effect are observed at a working voltage of 33kV or above. Therefore, careful design should be made to avoid corona on the sub-station or busbars rated for 33kV and higher voltages otherwise highly ionised air may cause flashover in the insulators or between the phases, causing considerable damage to the equipment. The corona effects can be reduced by the following methods:
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| Corona effect |
- By increasing conductor size. By increasing conductor size, the voltage at which corona occurs is raised and hence corona effects are considerably reduced. This is one of the reasons that ACSR (Aluminium Conductor Steel Reinforced) conductors which have a larger cross section area are used in transmission line.
- By increasing conductor spacing. By increasing the spacing between conductors, the voltage at which corona occurs is raised and hence corona effect can be eliminated. However, spacing cannot be increased too much otherwise the cost of supporting structure (e.g., bigger cross arms and supports) may increase to a considerable extent.
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