How does the electrical industry detect faults (LG, LLG etc) in the transmission grid?

  • Using voltage sag for fault detection & location?
  • Using overcurrent magnitudes for fault detection & location?
  • The analysis is performed using voltage/current AC waveforms or RMS (DC equivalent) waveforms?
  • Which equipment/s are used do we employ relays for this? Is there a relay which detects voltage sags?
  • Will be highly obliged if someone can answer the above queries. Thank you

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