Function of DC Selector Switch in Control and Relay Panel for double DC source

[@edisonjohnson4557]

Sir, Which make DC selection switch available in the market

[@Technicalcobra]

Why required double DC supply or separate DC for CRP

[@relayprotectionelectrical]

Because in CB there exist two trip coil... And in CRP there exist two main relay for voltage level 66 KV and above i.e. Main-1 distance relay and Main-2 distance relay .. therefore separate DC supply are given for main-1 and Tc-1 and main-2 and Tc-2 because failure of one DC will not impact relay and cb operation during fault condition.

[@relayprotectionelectrical]

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[@Technicalcobra]

@@relayprotectionelectrical what have position of DC selection switch in normal condition if both DC source available? Independent..........?

[@relayprotectionelectrical]

Yes you have given the answer