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 along with variety of additional functions for control, measurement, monitoring and communications.

  • Distance protection, 5 zones forward or reverse
  • Line differential, 2 slopes characteristic
  • Teleprotection, PUTT, POTT, Direct, DUTT
  • Pole discordance
  • Stub protection
  • Power swing block
  • out-of step
  • Three-phase overcurrent,3 stages INST, DT or IDMT
  • Residual overcurrent, 3 stages INST, DT or IDMT
  • Directional three-phase overcurrent, 2 stages INST, DT or IDMT
  • Directional residual overcurrent, 2 stages INST, DT or IDMT
  • Current unbalance, 1 stage
  • Overvoltage, 2 stages INST, DT
  • Undervoltage, 2 stages INST, DT
  • Residual voltage, 2 stages INST, DT
  • Under/over frequency, 4 stages DT
  • Rate of change of frequency, 1 stage DT
  • Line thermal protection
  • Breaker failure protection
  • Inrush detection and blocking
  • Auto-reclose, 4 shots
  • Synchrocheck
  • Voltage transformer supervision function
  • CT supervision
  • Switch onto fault
  • Distributed busbar protection sub-unit (option)
  • Single and three phase trip
  • Bay control unit, 6 objects
  • Status monitoring switching devices, 2 objects
  • Current (I1, I2, I3, Io)
  • Voltage (U1, U2, U3, U12, U23, U31, Uo) and frequency
  • Power (P, Q, S, pf) and Energy (E+, E-, Eq+, Eq-)
  • Trip circuit supervision (TCS)
  • Dead line detection function
  • Circuit breaker wear protection
  • Event recording
  • Non-volatile disturbance records: 100
  • Non-volatile event records: 10000
  • Current inputs: 4
  • Voltage inputs: 4
  • Digital inputs: 12 (Up to 120)
  • Digital outputs: 8 (Up to 40)
  • Fast trip outputs: 4
  • RJ 45 Ethernet 100Mb (front standard)
  • RJ 45 Ethernet 100Mb (rear standard)
  • RS422/RS485/RS232 interfaces (option)
  • Plastic or glass fiber interfaces (option)
  • Communication protocols
  • IEC 61850
  • IEC 608705101,103,104
  • Modbus RTU and Modbus TCP/IP
  • DNP 3.0 and DNP 3.0 over TCP/IP
  • SPAbus