Relay protection overcurrent direction element

As normal overcurrent relays cannot provide this function, a directional unit is added to activate the relay when the fault current flow is in a predetermined direction. Directional protection enables better discrimination of the faulty part of the network than with overcurrent. Abstract: Directional overcurrent protection IEEE device (67) refers to protection functions that utilize some angular relationship component of current or current and voltage to determine relay directionality. Although directional relays have been applied successfully for many years, several new and unique applicati and why directional element designs have progressed. The paper also describes how directional el ty, and form quadrilateral distance. While 50 and 51 (instantaneous and time overcurrent) relay functions monitor line current magnitude and guard against excesses, there are applications where the direction of line current is just as relevant as the magnitude. There are a variety of concepts by which this task is done.