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PCS-931 Line Differential Relay
  • The PCS-931 relay 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. The PCS-931 is intended for application on overhead lines and underground cables with diverse voltage levels, including series compensated, double-circuit, heavily loaded, weak infeed (WI), short and long lines. The relay provides dual pilot channels used for redundant tele-communication or three-terminal line application. It can meet the requirements of single-pole or three- pole tripping, it also provides single- and/or three-pole auto- reclosing functions. The PCS-931 is suitable for single- and dual-breaker applications, providing optional dual CT inputs, dual breaker failure protections, dual breaker auto-reclosing and dual synchro-checks. Additionally, the relay provides the remote/ local control of circuit breaker, disconnector and earth switch.

    The PCS-931 employs a wide range of innovative patented technologies, such as adaptive restraint threshold, dynamic capacitive current compensation, DPFC (Deviation Power Frequency Component) differential protection and unique power swing blocking logic, guaranteeing accurate and reliable operations.

    The PCS-931 is compatible with IEC 61850 station bus and process bus applications. It supports IEC 61850-8-1 MMS, GOOSE and IEC 61850-9-2 Sampling Value. The RJ-45 faceplate port is provided for testing and setting, allowing for easier commissioning and maintenance.


  • Protection and Control Monitoring and Measurement Communications User Interface
    • Phase-segregated DPFC differential protection (87L)

    • Phase-segregated current differential protection (87L)

    • Neutral current differential protection (87L)

    • Five zone phase-to-phase distance protection (21P)

    • One zone phase-to-phase distance protection for pilot scheme (85)

    • Five zone phase-to-ground distance protection (21G)

    • One zone phase-to-ground distance protection for pilot scheme (85)

    • High-speed DPFC distance protection (21D)

    • Pilot scheme of directional earth-fault protection (85)

    • Four stage phase overcurrent protection (50/51P)

    • Four stage neutral overcurrent protection ( 50/51G)

    • Three stages negative-sequence overcurrent protection(50/51Q)

    • Breaker failure protection for one or two breakers (50BF)

    • Stub overcurrent protection (50STB)

    • Three stage undervoltage protection and three stage overvoltage protection (27/59)

    • One stage negative-sequence overvoltage protection (59Q)

    • Four stage underfrequency protection and four stage overfrequency protection (81)

    • Phase overcurrent protection during VT failure (51P VT)

    • Neutral overcurrent protection during VT failure (51G VT)

    • Switch-onto-fault (SOTF) logic

    • Unique power swing blocking releasing logic (PSBR)

    • Out-of-step protection (78)

    • Broken conductor protection (46BC)

    • Dead zone protection (50DZ)

    • Thermal overload protection (49)

    • Pole discrepancy protection (62PD)

    • Single and/or three-pole auto-reclosing (single-breaker or dual-breaker ) (79)

    • Reverse power protection (32R)

    • Remote/local control

    • Synchronism check (25)

    • Voltage and current drift auto adjustment.

    • Frequency tracking

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

    • CT failure supervision

    • VT 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), IEEE 1588

    • Optional single or dual pilot channels (fiber optic), complying with 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 two 100Base-FX optical Ethernet ports using IEC 61850, DNP3.0 or IEC 60870-5-103 over TCP/IP ( Sharing two copper Ethernet ports)

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

    • One RS-485 serial port for clock synchronization

    • Optional Sampling value and GOOSE communication module with six optical Ethernet ports using IEC 61850-9-2 and IEC 61850-8-1 GOOSE

    • HMI interface with large-size LCD and 9-button keypad on the front panel

    • One front RJ-45 port for testing and setting

    • One RS-232 or RS-485 rear port for printer

    • Language selection – English + selected language

    • Assistant software - PCS-Explorer

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