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IDMT Relay stands for

  • IDMT relay stands for Inverse Definite Minimum Time relay.
  • It is a type of overcurrent relay used for the protection of power system equipment such as transformers, generators, and transmission lines.
  • The IDMT relay operates based on the principle that the time taken for a fault to be cleared should be inversely proportional to the magnitude of the fault current.
  • This means that as the fault current increases, the time taken for the relay to operate and trip the circuit breaker should decrease.
  • The IDMT relay achieves this by using a time-current characteristic curve that is inversely proportional to the fault current magnitude.
  • This ensures that the relay operates quickly for high fault currents and provides adequate time delay for lower fault currents.