why the undervoltage relay's interlock is used in earthswitch closing ope

why the undervoltage relay's interlock is used in
earthswitch closing operation of the 400kV line scheme?

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why the undervoltage relay's interlock is used in earthswitch closing operation of the 400kV ..

to make sure ES can be closed only if line is dead, besides that in common practice, CB status is needed also as interlock Earthing switch

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why the undervoltage relay's interlock is used in earthswitch closing operation of the 400kV ..

Answer / k.prakashchandra

So that the earth switch can not be closed with supply

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