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 ..

Answer / nur.asidik

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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