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Large internal faults are protected by

  • Large internal faults are protected by Merz price percentage differential protection Merz price percentage differential protection.
  • Merz-Price percentage differential protection is a type of differential protection scheme that is commonly used to protect large power transformers and generators from internal faults.
  • The protection scheme is based on the comparison of the current entering the equipment (usually on the high-voltage side) with the current leaving the equipment (usually on the low-voltage side).
  • If the difference between the two currents exceeds a certain percentage of the rated current of the equipment, the protection relay will operate and initiate a trip signal to isolate the equipment from the power system.