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A distance relay is one whose operation is based on measurement of:

A distance relay is one whose operation is based on measurement of: Correct Answer Length of feeder

Distance protection relay:

  • A distance protection relay is the name given to the protection, whose action depends on the distance of the feeding point to the fault.
  • The time of operation of such protection is a function of the ratio of voltage and current, i.e., impedance.
  • The delay automatically adjusts its operating time according to the distance of the relay from the fault point.
  • This impedance between the relay and the fault depends on the electrical distance between them.


Operating time, T ∝ (voltage/current) ∝ impedance ∝ distance along the transmission line

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