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Methods of reducing corona effect

Methods of reducing corona effect

It has been seen that intense corona effects are observed at a working voltage of 33 kV or above.
Therefore, careful design should be made to avoid corona on the sub-stations or bus-bars rated for 33kV and higher voltages otherwise highly ionised air may cause flash-over in the insulators or between the phases, causing considerable damage to the equipment.  The corona effects can be reduced by the following methods :

(i) 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 conductors which have a larger cross-sectional area are used in transmission lines.
(ii) By increasing conductor spacing By increasing the spacing between conductors, the voltage at which corona occurs is raised and hence corona effects 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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2 comments

  1. kit turbo chra

    Hi, It is one nice post, thank you.

  2. Yahya AlZarooni

    Hi, I hope you are doing well while reading this comment.
    Regarding the point of “By increasing conductor size”, could you provide me a more specific and detail explaination of how the corona effect is reduced.

    Thank you in advance and i hope to hear from you soon.

    Regards

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