AQ300 Series – AQ-L357 Line Protection Relay

The Arcteq AQ-L357 is a line protection relay with 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.
 

Key features of the AQ-L357 line protection relay

Protection functions

• Distance protection, 5 zones forward or reverse
• Pole discordance
• Stub protection
• Out of step
• Overvoltage, 2 stages INST, DT
• Undervoltage, 2 stages INST, DT
• Line thermal protection
• Breaker failure protection (50BF,52BF)
• Under/over frequency, 4 stages DT
• Rate of change of frequency, 1 stage DT

Measuring and monitoring

• 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
• Non-volatile disturbance records: 100
• Non-volatile event records: 10000

I/Os

• Current inputs: 4
• Voltage inputs: 4
• Digital inputs: 12 (Up to 120)
• Digital outputs: 8 (Up to 40)

Communications

• RJ 45 Ethernet 100Mb (front standard)
• RJ 45 Ethernet 100Mb (rear standard)
• RS422/RS485/RS232 interfaces (option)
• Plastic or glass fiber interfaces (option)
• IEC 61850
• IEC 608705101,103,104
• Modbus RTU and Modbus TCP/IP
• DNP 3.0 and DNP 3.0 over TCP/IP
• SPAbus