AQ-L397 Line protection device
Home Protection relays Line protection AQ-L397 Line protection device
Description
AQ-L397 is a line protection device with full scheme distance protection for transmission and sub-transmission line protection applications. It integrates a full range of line protection functions as well as a variety of additional functions for control, measurement, monitoring and communications.
Highlights:
Distance protection with polygon or MHO characteristics.
Impedance measuring in six separate loops for phase or earth faults.
Parallel line zero sequence current compensation.
Load encroachment and power swing block characteristics.
Zone 1 sub-cycle trip time.
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)
Negative sequence overcurrent/ Current unbalance (I2>; 46)
Thermal overload (T>; 49)
Overvoltage (U>; 59)
Undervoltage (U>; 27)
Residual overvoltage (U0>; 59N)
Over- and underfrequency (f>/<; 81O/81U)
Rate-of-change of frequency (df/dt; 81R)
Circuit breaker failure protection (CBFP; 50BF/52BF)
Teleprotection (85)
Inrush detection and blocking
Stub protection
Weak-end infeed protection
Distance protection
Distributed busbar protection (sub-unit) (optional)
Common function
Trip logic (94)
Dead line detection
Synchrocheck (ΔV/Δa/Δf; 25)
Auto-recloser (0 → 1; 79)
Switch-on-to-fault
Voltage variation
Current (IL1, IL2, IL3, I0)
Voltage (U1, U2, U3, U12, U23, U31, U0) and frequency (f)
Power (P, Q, S, pf) and Energy (E+, E-, Eq+, Eq-)
Current transformer supervision
Voltage transformer supervision (60)
Trip circuit supervision
Switching device status monitoring
Event recorder
Disturbance recorder
Standard
CPU module (MM/ST + RJ-45)
Power supply module (PS + fault relay + 2 trips)
Current measurement module
Voltage measurement module
Number of supervised trip contacts: 4
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)
4-channel RTD module
4-channel analogue input module (2-wire)
Communication inputs
ST/MM fiber optic Ethernet and RS-485 (optional)
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)
Line differential communication SM/FC (0-50 km) (optional)
Line differential communication SM/FC (10...120 km) (optional)
PRP/HSR (optional)
Communication protocols
IEC 60870-5-101/104/103
Modbus/RTU and Modbus/TCP
DNP3.0
IEC 61850 (optional)
PMU capability (optional)
Advanced "CyberProtect" cyber security feature (optional)
