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PCS-931S Line Differential Relay
  • PCS-931S provides full-scheme current differential and distance protection solutions for transmission lines with high-speed sub-cycle distance element. As well, the pilot scheme of distance protection and earth fault protection are integrated to provide a complete protection solution for the transmission line.


  • Protection and Control Monitoring and Measurement Communication
    • DPFC current differential protection (87L)

    • Steady-state current differential protection (87L)

    • Neutral current differential protection (87L)

    • Six zone phase-to-phase distance protection (21Q/21M)

    • Six zone phase-to-ground distance protection (21Q/21M)

    • Pilot distance protection (85)

    • Pilot directional earth-fault protection (85)

    • Six stages phase overcurrent protection (67P, 50/51P)

    • Six stages earth-fault protection (67G, 50/51G)

    • Four stages negative-sequence overcurrent protection (67Q, 50/51Q)

    • One stage undercurrent protection (37)

    • Four stages undervoltage protection (27P)

    • Four stages overvoltage protection (59P)

    • Four stages negative-sequence overvoltage protection (59Q)

    • Four stages zero-sequence overvoltage protection (59G)

    • Switch-onto-fault (SOTF) logic

    • Unique power swing blocking releasing logic (PSBR)

    • Auto-reclosing (79)

    • Remote/local control

    • Synchrocheck (25)

    • Voltage and current drift auto adjustment

    • Single-ended impedance-based fault location

    • Energy measurement (active and reactive energies for import and export)

    • CT circuit failure supervision

    • VT circuit failure supervision

    • Fault phase selection

    • Fault Locator with parallel-line compensation

    • Self diagnostic

    • Event recorder including 1024 change-of-binary-input events, 1024 supervision events, 256 control logs and 1024 device logs

    • Disturbance recorder including 32 disturbance records with waveforms (The format is compatible with COMTRADE.)

    • Pilot communication channel supervision

    • System frequency supervision

    • Clock synchronization using IRIG-B, SNTP, PPS (Pulse-Per- Second) and PPM (Pulse-Per-Minute) , IEEE1588

    • Optional single- or dual- pilot channels (fiber optic)

    • Support G.703 and C37.94

    • Up to four 10Base-T/100Base-TX copper Ethernet ports using IEC 61850, DNP3.0 or IEC 60870-5-103 over TCP/IP

    • Up to four 100Base-FX optical Ethernet ports using IEC 61850, DNP3.0 or IEC 60870-5-103 over TCP/IP

    • Two RS-485 serial ports using IEC 60870-5-103

    • One RS-485 serial port for clock synchronization

    • Support GOOSE communication module using IEC 61850-8-1 GOOSE

    • Full compatibility between IEC 61850 Editions 1 and 2

    • Redundancy protocols PRP and HSR

    • One front RJ-45 port for debugging

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