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A mho relay is used for protection of

  • A mho relay is used for protection of long Transmission Line.
  • Mho relays are distance relays that operate based on the measurement of the impedance (or apparent resistance) of the protected transmission line.
  • By comparing the measured impedance to a pre-set setting, the relay can determine the distance to the fault from the relay location.
  • This makes mho relays well-suited for protecting long transmission lines, as they can accurately identify the location of a fault and quickly isolate the affected section of the line.
  • Mho relays are relatively simple and inexpensive compared to other types of relays, making them a popular choice for transmission line protection.