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A relay that measures impedance or a component of the impedance at the relay location is known as

  • A relay that measures impedance or a component of the impedance at the relay location is known as Distance Relay.
  • Distance relays are commonly used for the protection of transmission lines, and can operate based on various types of impedance measurements, such as apparent impedance, reactance, or admittance.
  • By comparing the measured impedance to a pre-set setting, the relay can determine whether a fault has occurred and how far away it is, and can then initiate a protective action, such as tripping the circuit breaker to isolate the affected section of the line.