Answer Posted / engr. ajay

Directionalized relays are relays that use a polarizing
circuit to determine which "direction" (in the zone of
protection, or out of the zone protection) a fault is.
There are many different types and different polarizing
methods - ground polarizing, voltage polarizing, zero
sequence voltage polarizing, negative sequence polarizing,
etc.

The basic operation of this relay is just like any
nondirectional relay, but with an added torque control -
the directionalizing element. This element allows the relay
to operate when it is satisfied that the fault is within
the zone of protection (ie not behind where the relay is
looking).

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