AQ-L359 Line protection IED

AQ-L359 is a line protection IED with line differential and 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

  • Line differential protection
  • 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 subcycle trip time


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  • 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)
  • Line differential (87L)
  • Teleprotection (85)
  • Out-of-step protection
  • Power swing block
  • Stub protection
  • Inrush detection and blocking
  • Negative sequence overcurrent/ Current unbalance (I2>; 46)
  • Thermal overload (T>; 49)
  • Over- and undervoltage (U>/<; 59/27)
  • 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)
  • Pole slip (78) (optional)
  • Distributed busbar protection (sub-unit) (optional)
  • Common function
  • Trip logic (94)
  • Voltage variation
  • Auto-recloser (0 → 1; 79)
  • Switch-on-to-fault
  • Dead line detection
  • Synchrocheck (ΔV/Δa/Δf; 25)
  • Number of supervised trip contacts: 4
  • Current (IL1, IL2, IL3, I0)
  • Voltage (U1, U2, U3, U12, U23, U31, U0) and frequency
  • 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 (max. 10 000 permanent event records)
  • Circuit breaker wear monitoring
  • CPU module (MM/ST + RJ-45 + SM/FC)
  • Power supply module (PS + fault relay + 2 trips)
  • Voltage measurement module
  • Current measurement module
  • Number of empty slots: 6
  • RJ-45 100 Mbps Ethernet + MM/ST fiber optic Ethernet
  • IEC 61850 (optional)
  • IEC 60870-5-101/104/103
  • Modbus/RTU and Modbus/TCP
  • DNP3.0