AQ-T393 Three winding transformer protection IED

AQ-T393 is a transformer protection IED for 3-winding transformer applications. It integrates full range of protection functions along with variety of additional functions for control, measurement, monitoring and communications.

 

Highlights

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

  • Transformer differential, 2 slopes characteristic
  • Restricted earth fault, HV, LV sides
  • Overexcitation protection (option)
  • Automatic voltage regulator function (option)
  • Three-phase overcurrent,3 stages INST, DT or IDMT
  • Residual overcurrent, 3 stages INST, DT or IDMT
  • Current unbalance, 1 stage
  • Overvoltage (option), 2 stages INST, DT
  • Undervoltage (option), 2 stages INST, DT
  • Residual voltage (option), 2 stages INST, DT
  • Under/over frequency (option), 4 stages DT
  • Rate of change of frequency (option), 1 stage DT
  • Thermal overload protection
  • Breaker failure protection
  • Inrush detection and blocking
  • Voltage transformer supervision function (option)
  • CT supervision
  • Distributed busbar protection sub-unit (option)
  • Single and three phase trip
  • Bay control unit, 6 objects
  • Current (I1, I2, I3, Io)
  • Voltage (U1, U2, U3, U12, U23, U31, Uo) and frequency - optional
  • Power (P, Q, S, pf) and Energy (E+, E-, Eq+, Eq-) - optional
  • Trip circuit supervision, 4
  • Dead line detection function
  • Circuit breaker wear protection
  • Event recording
  • Non-volatile disturbance records: 100
  • Non-volatile event records: 10000
  • - AVR (Option)
  • Status monitoring switching devices, 2 objects
  • Current inputs: 12
  • Voltage inputs (option): 4
  • Digital inputs: 12 (Up to 120)
  • Digital outputs: 8 (Up to 40)
  • Fast trip outputs: 4
  • RJ 45 Ethernet 100Mb (front standard)
  • RJ 45 Ethernet 100Mb (rear standard)
  • RS422/RS485/RS232 interfaces (option)
  • Plastic or glass fiber interfaces (option)
  • Communication protocols
  • IEC 61850
  • IEC 608705101,103,104
  • Modbus RTU and Modbus TCP/IP
  • DNP 3.0 and DNP 3.0 over TCP/IP
  • SPAbus