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Discrimination between main and backup protection is provided by the use of relays which are

  • Discrimination between main and backup protection is provided by the use of relays which are slow.
  • One key feature of backup protection relays is that they include a time-delay facility.
  • This time-delay allows the primary protection to operate first, and if it fails, the backup protection will operate after a predetermined time delay.
  • Backup protection is usually designed to operate only if the main protection fails to operate correctly.
  • This means that the main protection will usually operate first and isolate the faulty section of the power system.
  • Therefore, the speed of the backup protection is not as critical as that of the main protection.