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  Application Notes
DTP-B Digital Transformer Protection

DTP-B Digital Transformer Protection

The DTP-B is a digital relay that provides high-speed differential and backup instantaneous differential three phase protection functions for power transformers. Different models of the DTP are available for protecting and monitoring transformers with two, three or four windings.

End-of-life Notice: The DTP Digital Transformer Protection relay has been discontinued as of December 31, 2013
Read full notice: English | Spanish


Protection and Control
  • Current differential protection
  • 2, 3 or 4 windings
  • Dual-slope percentage restraint
  • 2nd & 5th harmonic cross-restrained
  • Internal phase shift compensation
  • 7 configurable digital inputs
  • 4 trip contacts

  • Monitoring and Metering
  • All currents
  • Event recorder
  • Oscillography recorder
  • Self-Checking functions

  • User Interface
  • 20 key keypad
  • Alphanumeric 2-line LCD
  • 16 LED indicators
  • RS232, plastic or glass fiber optic