KD Relay Application Compensator distance relay that provides

KD Relay Application: • Compensator distance relay that provides a single zone of phase protection for all three phases. • It provides tripping for phase to phase, two phase to ground and three phase faults within the reach setting and sensitivity level of the relay

KD Relay Construction Cylinder Unit: • Main function is to operate when the angle between two signal applied is within certain range. • Widely used as a directional unit and in impedance relays.

KD Relay Construction Cylinder Unit: • T=KI 1 I 2 SIN(Ø 12 -Ø)-KS • Where K and Ø are design constants. • Different combinations of input quantities can be used for different applications, system voltages or currents or network voltages.

KD Relay Construction Compensator: • Designated as T • Current to Voltage air gap transformer. • Voltage side has a tap which divides the winding in two sections. • The output voltage angle can be changed by connecting a resistor across one of the voltage winding sections

KD Relay Construction Compensator:

KD Relay

KD Relay Operation:

KD Relay

KD Relay C 3 C Capacitor

KD Relay Impedance Circle

KD Relay Impedance Curve

KD Relay

KD RELAY Equations needed for testing Relay Setting • Impedance measured by 3 phase unit Used to find required test current • Impedance measured by 2 phase unit Used to find required test current

Tests Required • Main tests required are the compensator check, maximum torque angle and the impedance test for 3 phase unit and phase to phase units.