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Admittance relay is _______ relay.

  • Admittance relay is distance relay.
  • An admittance relay can be used as a distance relay by using the inverse admittance concept.
  • The inverse admittance is defined as the reciprocal of the admittance of the transmission line.
  • The inverse admittance is plotted on the R-X diagram, where the R-axis represents the resistance of the transmission line and the X-axis represents the reactance of the transmission line.
  • The characteristic of the admittance relay as a distance relay is a straight line that passes through the origin on the R-X diagram.
  • The admittance relay is commonly used as a distance relay in pilot schemes, where the relay is connected to the sending and receiving ends of a transmission line.
  • The relay measures the admittance of the line, calculates the inverse admittance, and compares it to a set value.
  • If the measured inverse admittance exceeds the set value, the relay operates and initiates a protective action.