AQ-L350 Line differential protection device
Home Protection relays Line protection AQ-L350 Line differential protection device
Description
AQ-L350 is a line protection device with line differential 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:
Two kinds of algorithms: one with the transformer in the protected zone and one with the transformer not in the protected zone.
Line differential, up to 120 km with fiber optic communication.
Redundant fiber communication option.
Mono-mode and multi-mode fiber support.
Alternative communication media available (e.g. pilot wire).
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)
Line differential (87L)
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
Common function
Trip logic (94)
Dead line detection
Auto-recloser (0 → 1; 79)
Switch-on-to-fault
Voltage variation
Synchrocheck (ΔV/Δa/Δf; 25)
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)
Switching device status monitoring
Trip circuit supervision
Event recorder
Disturbance recorder
Standard
CPU module (MM/ST + RJ-45 + SM/FC)
Power supply module (PS + fault relay + 2 trips)
Current measurement module
Number of empty slots: 6
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
Line differential communication SM/FC (0...50 km)
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 (10...120 km) (optional)
Line differential communication C37.94 (optional)
Line differential communication G703 (optional)
Redundant fiber/T branch communication (optional)
PRP/HSR (optional)
Communication protocols
IEC 60870-5-101/104/103
Modbus/RTU and Modbus/TCP
DNP3.0
IEC 61850 (optional)
Line differential with transformer in zone (optional)
Pole slip (78) (optional)
Advanced "CyberProtect" cyber security feature (optional)
