DTMR

Differential Transformer Relay

50/51, 87T, 87N/51N

  • F50/51 : Two phase fault levels (side 1 and side 2)
  • F87T : Two phase differential level
  • F87N/51N : Restricted earth fault (side 1 and side 2)
  • Trip circuit supervision
  • Associated Circuit Breaker control (OPEN / CLOSE)
  • Breaker failure protection
  • Breaker interruption energy ∑i2t
  • IA,IB,IC : Current
  • dA,dB,dC : Differential current
  • 2H,5H : 2nd & 5th Harmonic detection current
  • Io : Neutral current
  • Event Recording (last 100 events)
  • Trip Recording (last 10 trips with date & time)
  • Oscillographic Recording of input quantities (8 chanels, 32 sample/cycle, 2sec each)
  • Time tagging resolution 1ms
  • 2 Setting programs
  • 6 Output Relays
  • 4 Digital Inputs
  • CAN BUS port for Input/Output expansion modules connection
  • Local push-buttons for C/B control
  • 1 RS232 Serial communication port on front face
  • 1 RS485 Serial communication port on rear side
  • Synchronization with other relays
  • Multilanguage Display (English, Italian, available - other on request)
  • Modbus RTU or IEC60870-5-103 communication protocols
  • Blocking input and Blocking output for pilot wire selectivity coordination
  • Very powerful CPU (2 microprocessors)
  • Graphical Display (128x64 dot)
  • 4 Leds for : Power/IRF, Trip/Alarm/TCF
  • IP44 protection case (on request IP54)
  • Totally draw-out execution
  • Autoranging multivoltage power supply
  • Complete autodiagnostic program

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