AQ-F255 Feeder Protection IED

The AQ-F255 offers a modular feeder protection and control solution for applications requiring large I/O capacity. Up to 11 optional I/O or communication cards are available for extensive monitoring and control applications. The AQ-F255 communicates using various protocols including IEC 61850 substation communication standard.

Highlights

  • Large I/O capability
  • Directional and voltage protection
  • Cable end differential protection
  • Low-impedance REF protection
  • Harmonics protection and control
  • 5-shot scheme controlled autorecloser
  • Up to class 0.2S power and energy measurement
Protection
Three-phase overcurrent, 4 stages INST, DT or IDMT (50/51)
Earth-fault (sensitive), 4 stages INST, DT or IDMT (50/51N)
Directional overcurrent, 4 stages INST, DT or IDMT (67)
Directional earth-fault, 4 stages INST, DT or IDMT (67N)
Transient earth-fault (67NT)
Harmonic overcurrent / inrush blocking, 4 stages INST, DT or IDMT (50/51H, 68)
Current unbalance / broken conductor, 4 stages INST, DT or IDMT 46/46R/46L)
High/low impedance restricted earth fault / cable end differential * (87N)
Cable thermal protection (49L)
Overvoltage, 4 stages INST, DT or IDMT (59)
Zero sequence overvoltage, 4 stages INST, DT or IDMT (59N)
Negative/positive sequence overvoltage, 4 stages INST, DT or IDMT (47)
Vector jump, 1 stage (78) Over/ under frequency, 8 stages INST or DT (81O/81U)
Rate of change of frequency, 8 stages INST or DT or IDMT (81R)
Over/Under/Reverse power (32/37/32R)
Breaker failure protection (50BF/52BF)
Arc protection (option) (50ARC/50NARC)