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BDD Percentage Differential with Harmonic Restraint

BDD Percentage Differential with Harmonic Restraint

The Type BDD relays are for the protection of transformers rated 2000 kVA and above and for transformers with windings rated 15 kV or above. However, the importance of the transformer to the system, not its size alone, should be the basis for the decision on this quality of protection.

Applications
  • Power and autotransformer protection
  • Protection and Control
  • High speed percentage differential
  • Phase and ground fault detection
  • Current restraint circuits available
  •