AQ-T256 Transformer protection IED

AQ-T256 is a transformer protection IED with a sophisticated and easy-to-use differential protection function. The relay provides overcurrent protection for both LV and HV side, earth fault protection, negative sequence overcurrent protection as well as two independent instances of restricted earth fault protection. You can add up to ten (10) I/O or communication cards into the device for extensive monitoring and control applications. AQ-T256 communicates using various protocols, including the IEC 61850 substation communication standard.

 

Highlights

  • A large I/O capacity
  • A pre-defined or custom connection group selection & 2nd and 5th harmonic blocking
  • Automatic verification of connection group and nominal value settings
  • Overloading and through fault statistics for preventive maintenance


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  • Non-directional overcurrent (I>; 50/51) - 4 stages (INST, DT or IDMT)
  • Non-directional earth fault (I0>; 50N/51N) - 4 stages (INST, DT or IDMT)
  • Negative sequence overcurrent/ Phase current reversal/ Current unbalance (I2>; 46/46R/46L) - 4 stages (INST, DT or IDMT)
  • Harmonic overcurrent (Ih>; 50H/51H/68H) - 4 stages (INST, DT or IDMT)
  • Sequence voltage (U1/U2>/<; 47/27P/59PN) - 4 stages (INST, DT or IDMT)
  • Circuit breaker failure protection (CBFP; 50BF/52BF)
  • Volts-per-hertz overexcitation (V/Hz>; 24)
  • Resistance temperature detectors
  • Generator/transformer differential (87T/87N/87G)
  • Transformer status monitoring
  • Transformer thermal overload (TT>; 49T)
  • Programmable stage (PGx>/<; 99)
  • Arc protection (IArc>/I0Arc>; 50Arc/50NArc) (optional)
  • Number of objects to control and monitor: 10
  • Number of indicators to monitor: 10
  • Number of setting groups: 8
  • Switch-on-to-fault
  • Vector jump (Δφ; 78)
  • Synchrocheck (ΔV/Δa/Δf; 25)
  • Phase, sequence and residual currents (IL1, IL2, IL3, I01, I02)
  • Phase, sequence and residual voltages (UL1, UL2, UL3, U12, U23, U31, U0)
  • Current transformer supervision - 2 instances
  • Disturbance recorder (max. 15 000 permanent event records)
  • Circuit breaker wear monitoring
  • Total harmonic distortion
  • Fault locator (21FL)
  • Measurement recorder
  • Measurement value recorder
  • Current inputs: 10
  • Digital inputs (fixed): 3
  • Digital outputs (fixed): 5
  • Options (10 slots)
  • Digital inputs: +8/16/24/32/40/48/56/64/72/80
  • Digital outputs: +5/10/15/20/25/30
  • RTD & mA input module (8 RTD inputs OR 4 RTD inputs + 2 mA inputs)
  • Milliampere I/O module (4 mA outputs + 1 mA input)
  • Arc protection module (4 sensors + 2 HSO + 1 BI)
  • Communication media (specified in the "Communication" tab)
  • RJ-45 100 Mbps Ethernet (front panel, fixed)
  • RJ-45 100 Mbps Ethernet and RS-485 (rear panel, fixed)
  • Double LC 100 Mbps Ethernet (optional)
  • RS-232 & serial fibre (PP/PG/GP/GG) (optional)
  • Communication protocols
  • IEC 61850
  • IEC 60870-5-101/104
  • IEC 60870-5-103
  • Modbus/RTU and Modbus/TCP
  • DNP3
  • SPA