AQ-G357 Generator protection device
Home Protection relays Generator protection & control AQ-G357 Generator protection device
Description
AQ-G357 is a generator protection device for synchronized machines of all sizes. It integrates a full range of generator protection functions as well as a variety of additional functions for control, measurement, monitoring and communications.
Highlights:
Generator/motor differential protection.
Distance protection and loss of excitation protection.
Overexcitation protection.
Technical data
Three-phase instantaneous/time overcurrent (I>; 50/51)
Residual instantaneous/time overcurrent (I0>; 50N/51N)
Directional three-phase overcurrent (Idir>; 67)
Directional residual overcurrent (I0dir>; 67N/32N)
Voltage-restrained overcurrent (Iv>; 51V)
Negative sequence overcurrent/ Current unbalance (I2>; 46)
Thermal overload (T>; 49)
Generator differential (87G)
Overvoltage (U>; 59)
Undervoltage (U>; 27)
Residual overvoltage (U0>; 59N)
Harmonic overvoltage (64H)
Over- and underfrequency (f>/<; 81O/81U)
Rate-of-change of frequency (df/dt; 81R)
Directional overpower (P<; 32O)
Directional underpower (P>; 32U)
Impedance protection
Loss of excitation (40)
Volts-per-hertz overexcitation (V/Hz>; 24)
Circuit breaker failure protection (CBFP; 50BF/52BF)
Inrush detection and blocking
Distributed busbar protection (sub-unit) (optional)
Common function
Trip logic (94)
Dead line detection
Voltage variation
Current (IL1, IL2, IL3, I0)
Voltage (U1, U2, U3, U12, U23, U31, U0) and frequency (f)
Frequency (f)
Power (P, Q, S, pf) and Energy (E+, E-, Eq+, Eq-)
Current transformer supervision
Voltage transformer supervision (60)
Switching device status monitoring
Trip circuit supervision
Event recorder
Disturbance recorder
Standard
CPU module (MM/ST + RJ-45)
Power supply module (PS + fault relay + 2 trips)
Current measurement module (2 instances)
Voltage measurement module
Number of empty slots: 5
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)
Trip module (4 outputs)
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)
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)
Advanced "CyberProtect" cyber security feature (optional)
