AQ-T393 Three-winding transformer protection device
Home Protection relays Transformer protection & control AQ-T393 Three-winding transformer protection device
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.
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)
