Differential relays are not used for which of the following faults

Electrical Engineering XYZ MCQs

Differential relays does not used for which of the following faults:

  1. Faults within a transformer
  2. Faults within a generator
  3. Both 1 and 2
  4. Through faults

Correct answer: 4. Through faults

Explanation: Through faults are faults that occur external to the protected zone. These faults do not involve the equipment being protected by the differential relay. Differential relays are not typically used to detect through faults since they focus on monitoring imbalances in currents specifically within the protected zone. Through faults are more commonly detected using over-current relays or other protection schemes.

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