AQ-T259 Transformer protection IED

AQ-T259 is a 3-winding transformer protection IED with differential protection function and integrated AVR function. The AQ-T259 communicates using various protocols including IEC 61850 substation communication standard.

 

Highlights

  • 3-winding transformer protection
  • Freely programmable harmonic restraint function
  • Integrated AVR


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  • Generator/transformer differential (Idx>; 87T/87N/87G) (3-winding)
  • Transformer thermal overload (TT>; 49T)
  • Non-directional overcurrent (I>; 50/51) - 2+2 stages (INST, DT or IDMT)
  • Non-directional earth fault (I0>; 50N/51N) - 3 stages (INST, DT or IDMT)
  • Harmonic overcurrent (Ih>; 50H/51H/68H) - 4 stages (INST, DT or IDMT)
  • Negative sequence overcurrent/ Phase current reversal/ Current unbalance (I2>; 46/46R/46L) - 2+2 stages (INST, DT or IDMT)
  • Directional overcurrent (Idir>; 67) - 4 stages (INST, DT or IDMT)
  • Sequence voltage (U1/U2>/<; 47/27P/59PN) - 2 stages (INST, DT or IDMT)
  • Rate-of-change of frequency (df/dt>/<; 81R) - 4 stages (INST or DT)
  • Volts-per-hertz overexcitation (V/Hz>; 24)
  • Arc protection (IArc>/I0Arc>; 50Arc/50NArc) (optional)
  • Number of objects to control and monitor: 10
  • Number of setting groups: 8
  • Phase, sequence and residual currents (IL1, IL2, IL3, I01, I02)
  • Phase, sequence and residual voltages (UL1, UL2, UL3, U12, U23, U31, U0)
  • Frequency (f)
  • Circuit breaker wear monitoring
  • Event recorder (max. 15 000 permanent event records)
  • Current transformer supervision
  • Voltage transformer supervision (60)
  • Trip circuit supervision
  • Event recording
  • Voltage inputs: 4
  • Digital inputs (fixed): 6
  • Options (7 slots)
  • Digital inputs: +8/16/24/32
  • Digital outputs: +5/10/15/20/25
  • RJ-45 100 Mbps Ethernet and RS-485 (rear panel, fixed)
  • 2 x LC 100 Mbps Ethernet (PRP/HSR) (optional)
  • RS-232 serial fiber (PP/PG/GP/GG) (optional)
  • Communication protocols
  • IEC 61850 Edition 1 and Edition 2
  • Modbus/RTU and Modbus/TCP
  • DNP3
  • SPA