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combined differential and restricted earth fault scheme.

combined differential and restricted earth fault scheme.

combined differential and restricted earth fault scheme.

(OP)
Guys,
I need to carry out this kind of scheme using star/delta auxilliary current transformers but am puzzled on how to specify the phase correcting auxilliary CTs. Can someone help me?

RE: combined differential and restricted earth fault scheme.

With modern numeric relays there is no need for aux CTs.  The use of aux CTs is a hold over from the days of electromechanical relays and is best avoided if possible.

RE: combined differential and restricted earth fault scheme.

What David said.
Regards.
Slava

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