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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. - PowerPoint PPT Presentation
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KD RelayApplication:• 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 ConstructionCylinder 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.
•
KD Relay ConstructionCompensator:• 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 ConstructionCompensator:
KD Relay
KD Relay
Operation:
KD Relay
KD RelayC3C Capacitor
KD Relay
Impedance Circle
KD Relay
Impedance Curve
KD Relay
KD RELAY Equations needed for testing
MSTZSetting
1
•Impedance measured by 3 phase unit
L
LL
IVZr
3Setting
LLL Z
VI3
Relay Setting
Used to find required test current
•Impedance measured by 2 phase unit
L
LL
IVZr
2 Setting
LLL Z
VI
2 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.