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PCS-931S Line Differential Relay
  • PCS-931S line differential relay integrates main and back-up protection functions, which is designed for overhead line, cables and hybrid transmission lines of various voltage levels and provides comprehensive protection and control solutions. With its flexibility and the powerful PCS-Studio configuration tool, PCS-931S offers future-oriented system solutions with high investment security and low operating costs.


  • Protection and Control Synchrophasor measurement Measurement Recording Supervision Communication interface Communication protocol
    • High-speed DPFC distance protection (21D)

    • Six zone phase-to-phase distance protection (21L)

    • Six zone phase-to-ground distance protection (21L)

    • DPFC current differential protection (87L)

    • Steady-state current differential protection (87L)

    • Neutral current differential protection (87L)

    • Pilot distance protection (85)

    • Pilot directional earth-fault protection (85)

    • Unique power swing blocking releasing logic (PSBR)

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

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

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

    • Switch-onto-fault (SOTF) logic

    • Two stages phase undervoltage protection (27P)

    • Two stages phase overvoltage protection (59P)

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

    • Two stages residual overvoltage protection (59G)

    • Four stages overfrequency protection (81O)

    • Four stages underfrequency protection (81U)

    • Four stages frequency rate-of-change protection (81R)

    • Two stages reverse power protection (32R)

    • Two stages thermal overload protection (49P)

    • One stage undercurrent protection (37)

    • Breaker failure protection (50BF)

    • Flashover protection (50F)

    • Dead zone protection (50DZ)

    • Broken conductor protection (46BC)

    • Pole discrepancy protection (62PD)

    • Stub differential protection (87STB)

    • Out-of-step protection (78)

    • Auto-reclosing (79)

    • Switchgear control

    • Synchronism Check (25)

    • Voltage selection

    • Voltage and current drift auto adjustment

    • Single-ended impedance-based fault location

    • Travelling-Wave fault location including single-ended travelling-wave-based method and double-ended travelling-wave-based method


    • Synchronize with the GPS time by IRIG-B time source

    • Calculate synchronized phasors, including: Ua, Ub, Uc, U1, U2, U0, Ia, Ib, Ic, I1, I2, I0

    • Calculate analog values, including: active power (P), reactive power (Q), frequency, ROCOF (df/dt)

    • Transmit binary status of the IED to PDC (Phasor Data Concentrator) according to IEEE C37.118 standard

    • Realize high accurate measurement of the phasors and analogs according to the IEEE C37.118.1-2011 and IEEE C37.118.1a-2014 standard.

    • Communicate with PDC according to IEEE C37.118-2005 and IEEE C37.118.2-2011


    • Current and voltage measurement at a 2.4KHz sampling rate

    • Current and voltage measurement at a 9.6KHz sampling rate

    • Travelling wave current measurement at a 1MHz sampling rate

    • Energy metering (active and reactive energy are calculated in import respectively export direction)

    • Power (Apparent/Real/Reactive)

    • Power factor

    • Frequency


    • Event Recorder including 1024 disturbance records, 1024 binary events, 1024 supervision events, 256 control logs and 1024 device logs.

    • 64 disturbance waveforms records (The file format of disturbance recorder is compatible with international COMTRADE file.)

    • 64 travelling wave fault location (TWFL) records (The file format of disturbance recorder is compatible with international COMTRADE file.)

    • 64 high-frequency waveforms records (The file format of disturbance recorder is compatible with international COMTRADE file.)


    • CT circuit failure supervision

    • VT circuit failure supervision

    • Trip/Close coil supervision

    • Self diagnostic

    • Pilot communication channel supervision

    • DC power supply supervision

    • Channel status statistic

    • System frequency supervision


    • 2 or 4 100Base-TX copper Ethernet ports for SCADA communication

    • 2 or 4 100Base-FX optical Ethernet ports for SCADA communication

    • 2 RS-485 serial ports for SCADA communication

    • 1 RS-485 serial port for clock synchronization

    • 1 TTL serial port for clock synchronization

    • 1 BNC port for clock synchronization

    • 1 front RJ-45 port for debugging

    • 1 rear RJ-45 port for debugging


    • IEC 61850 Editions 1 and 2

    • IEC 60870-5-103

    • DNP3.0

    • Modbus

    • IEC 62439 Parallel Redundancy Protocol (PRP)

    • IEC 62439 High-availability Seamless Redundancy (HSR)

    • IEEE 802.1w Rapid Spanning Tree Protocol (RSTP)


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