AQ-T393 Three-winding transformer protection IED

AQ-T393 is a transformer protection IED for three-winding transformer applications. It integrates a full range of protection functions as well as a variety of additional functions for control, measurement, monitoring and communications.

 

Highlights

  • Low-impedance restricted earth fault protection
  • Second and fifth harmonic restraint
  • An integrated automatic voltage regulator (AVR)
  • Three-winding transformer protection


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  • Three-phase instantaneous/time overcurrent (I>; 50/51)
  • Residual instantaneous/time overcurrent (I0>; 50N/51N)
  • Inrush detection and blocking
  • Negative sequence overcurrent/ Current unbalance (I2>; 46)
  • Thermal overload (T>; 49)
  • Transformer differential, three windings (87T)
  • Restricted earth fault
  • Circuit breaker failure protection (CBFP; 50BF/52BF)
  • Optional functions
  • Over- and undervoltage (U>/<; 59/27)
  • Residual overvoltage (U0>; 59N)
  • Over- and underfrequency (f>/<; 81O/81U)
  • Rate-of-change of frequency (df/dt; 81R)
  • Volts-per-hertz overexcitation (V/Hz>; 24)
  • Distributed busbar protection (sub-unit)
  • Common function
  • Trip logic (94)
  • Switch-on-to-fault
  • Synchrocheck (ΔV/Δa/Δf; 25)
  • Automatic voltage regulator /Tap change control (optional)
  • Current (IL1, IL2, IL3, I0)
  • Current transformer supervision
  • Trip circuit supervision
  • Switching device status monitoring
  • Event recorder
  • Disturbance recorder (max. 10 000 permanent event records)
  • Circuit breaker wear monitoring
  • Optional measurements and monitoring functions
  • Voltage (U1, U2, U3, U12, U23, U31, U0) and frequency
  • Power (P, Q, S, pf) and Energy (E+, E-, Eq+, Eq-)
  • Voltage transformer supervision (60)
  • CPU module (MM/ST + RJ-45)
  • Power supply module (PS + fault relay)
  • Current measurement module (3 instances)
  • Number of empty slots: 16
  • RJ-45 100 Mbps Ethernet + MM/ST fiber optic Ethernet
  • IEC 61850 (optional)
  • IEC 60870-5-101/104/103
  • Modbus/RTU and Modbus/TCP
  • DNP3.0

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