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In CDG type IDMTL realy O/L , E/F, O/C which are used for
out going feedrs,on R-phase o/c element, Y-phase , e/f
elecment and on b -phase o/c element will be connected .
Why the earth fault on center phase only, why not on other
two phases?

Question Posted / gova

Answer Posted / gova

This is called 2 O/C+1E/F relay scheme.This scheme is used
mainly where the transformer connection is Dyn11.

please refer the current distribution in this transformer
when a fault occurs in feeder.

This scheme will be sufficient to clear the faulty
section.But nowdays 3O/C+1 E/F relay scheme also used in
many places

gova

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