AQ-T257 Transformer protection IED

AQ-T257 is a transformer protection IED with differential protection function and integrated AVR function. The AQ-T257 transformer protection IED provides also for complete current and voltage based protection functions and full measurements. Up to 9 optional I/O or communication cards are available for extensive monitoring and control applications. The AQ-T257 communicates using various protocols including IEC 61850 substation communication standard.

 

Highlight

  • Large I/O capability 2nd and 5th harmonic blcocking
  • Automatic / manual voltage regulating (AVR)
  • Complete transformer protection
  • 2nd and 5th harmonic blocking
  • Automatic verification of connection group and nominal value settings
  • Through fault and overloading statistics for preventive maintenance
  • Up to class 0.2S power and energy measuring

  • 2 winding transformer differential (87T)
  • High/low impedance restricted earth fault / cable end differential * (87N1, 87N2)
  • Transformer thermal overload (49T/49RTD)
  • Three-phase overcurrent, 2+2 stages INST, DT or IDMT (50/51)
  • Earth-fault (sensitive), 3 stages INST, DT or IDMT (50/51N)
  • Harmonic overcurrent / inrush blocking, 4 stages INST, DT or IDMT (50/51H, 68)
  • Current unbalance / broken conductor, 2+2 stages INST, DT or IDMT (46/46R/46L)
  • Directional overcurrent, 4 stages INST, DT or IDMT (67)
  • Directional (sensitive) earth-fault, 4 stages INST, DT or IDMT (67N)
  • Overvoltage, 2 stages INST, DT or IDMT (59)
  • Undervoltage, 2 stages INST, DT or IDMT (27)
  • Zero sequence overvoltage, 2 stages INST, DT or IDMT (59N)
  • Positive/Negative sequence overvoltage, 2 stages INST, DT or IDMT (59N/47)
  • Over/under frequency, 4 stages INST or DT (81O/81U)
  • Rate of change of frequency, 4 stages INST or DT or IDMT (81R)
  • Volts per hertz (24)
  • Breaker failure protection (50BF/52BF)
  • Arc protection (option) (50ARC/50NARC)
  • Controllable objects: 10
  • Synchro-check (25)
  • 8 setting groups
  • Event recording
  • Non-volatile disturbance records: 100
  • Non-volatile event records: 15000
  • Current inputs: 10
  • Voltage inputs: 4
  • Digital inputs: 3 (standard)
  • Output relays: 5+1 (standard)
  • Options (9 slots)
  • Digital inputs optional: +8/16/24/32/40/48/56/64/72
  • Digital outputs optional: +5/10/15/20/25
  • Arc protection (12 sensors +2xHSO +BI)
  • 2 x mA input + 6-8 x RTD input
  • Communication media (specified below)
  • RJ 45 Ethernet 100Mb (front standard)
  • RJ 45 Ethernet 100Mb and RS 485 (rear standard)
  • Double LC Ethernet 100Mb (option)
  • RS232 + serial fibre PP/PG/GP/GG (option)
  • Communication protocols
  • IEC 61850
  • IEC 60870-5-103/101/104
  • Modbus RTU, Modbus TCP/IP
  • DNP 3.0, DNP 3.0 over TCP/IP
  • SPA