AQ-T393 Three-winding transformer protection device
AQ300_full rack_web_2
AQ300_full rack_web_2

Description

AQ-T393 three-winding transformer protection device is a transformer protection device 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.
  • 2nd and 5th harmonic restraint.
  • An integrated automatic voltage regulator (AVR).
  • Three-winding transformer protection.
AQ300_full rack_web_2

Technical data

  • Three-phase instantaneous/time overcurrent (I>; 50/51)
  • Residual instantaneous/time overcurrent (I0>; 50N/51N)
  • Negative sequence overcurrent/ Current unbalance (I2>; 46)
  • Circuit breaker failure protection (CBFP; 50BF/52BF)
  • Restricted earth fault (87N)
  • Thermal overload (T>; 49)
  • Transformer differential, three windings (87T)
  • Overvoltage (U>; 59)
  • Undervoltage (U>; 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)
  • Inrush detection and blocking
  • Distributed busbar protection (sub-unit)

  • Common function
  • Trip logic (94)
  • Switch-on-to-fault

  • Standard
  • Current (IL1, IL2, IL3, I0)
  • Current transformer supervision
  • Trip circuit supervision
  • Switching device status monitoring
  • Event recorder
  • Disturbance recorder
  • Options
  • Voltage (U1, U2, U3, U12, U23, U31, U0) and frequency (f)
  • Power (P, Q, S, pf) and Energy (E+, E-, Eq+, Eq-)
  • Voltage transformer supervision (60)

  • Standard
  • CPU module (MM/ST + RJ-45)
  • Power supply module (PS + fault relay)
  • Current measurement module (3 instances)
  • Trip module (4 outputs)
  • Number of empty slots: 16
  • Options
  • 6 digital inputs (1x6) + 5 digital outputs
  • 8 digital inputs (1x8)
  • 12 digital inputs (3x4)
  • 16 digital inputs (2x8)
  • 9 digital inputs (3x3) with IRIG-B (BNC)
  • 8 digital outputs (1x8)
  • 12 digital outputs (4x3)
  • 16 digital outputs (2x8)
  • Voltage measurement module
  • 4-channel RTD module
  • 4-channel analogue input module (2-wire)

  • Communication inputs
  • RJ-45 100 Mbps Ethernet + MM/ST fiber optic Ethernet
  • 2 x ST/MM redundant fiber optic Ethernet (optional)
  • ST/MM fiber optic Ethernet and RS-485 (optional)
  • LC/MM and RJ-45 (optional)
  • 2 x LC/MM (optional)
  • PRP/HSR (optional)
  • Communication protocols
  • IEC 60870-5-101/104/103
  • Modbus/RTU and Modbus/TCP
  • DNP3.0
  • IEC 61850 (optional)

  • Transformer automatic voltage regulator (AVR) function
  • Synchrocheck (25) (optional)
  • Advanced "CyberProtect" cyber security feature (optional)

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