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KD Relay

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.

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KD Relay

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  1. 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

  2. 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.

  3. KD Relay Construction Cylinder Unit: • T=KI1I2SIN(Ø12-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.

  4. 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

  5. KD Relay Construction Compensator:

  6. KD Relay

  7. KD Relay Operation:

  8. KD Relay

  9. KD Relay C3C Capacitor

  10. KD Relay Impedance Circle

  11. KD Relay Impedance Curve

  12. KD Relay

  13. 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

  14. 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.

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