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PCS-902S Line Distance Relay
  • PCS-902S provides comprehensive protection and control solutions for transmission lines with high-speed sub-cycle distance element. The PCS-902S is intended for application on overhead line, cables and hybrid transmission lines with diverse voltage levels. With its flexibility and the powerful PCS-Studio configuration tool, PCS-902S offers future-oriented system solutions.


  • Protection and Control Monitoring and Measurement Communication
    • Six zone phase-to-phase distance protection (21Q/21M)

    Mho or quadrilateral characteristic, directional, load encroachment, power swing blocking releasing and unique low-voltage elements are provided for phase-to-phase distance protection.

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

    An independent zone for pilot scheme, such as PUTT, POTT, Blocking, Unblocking, DTT & Zone Extension. The scheme integrates current reversal logic, weak-infeed echo and open breaker echo.

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

    Mho or quadrilateral characteristic, reactance characteristic, directional, load encroachment, power swing blocking releasing and unique low-voltage elements are provided for phase-to-ground distance protection.

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

    An independent zone for pilot scheme, such as PUTT, POTT, Blocking, Unblocking, DTT & Zone Extension. The scheme integrates current reversal logic, weak-infeed echo and open breaker echo.

    • High-speed DPFC distance protection (21D)

    Innovative Deviation of Power Frequency Component (DPFC) distance protection quickly clears faults in a sub- cycle. DPFC is immune to the load fluctuation, weak-infeed and power swing.

    • Pilot directional earth-fault protection (85)

    Directional zero-sequence comparison element for pilot scheme, such as PTT, Blocking and Unblocking. The scheme integrates current reversal logic, weak-infeed echo and open breaker echo.

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

    Selectable time characteristics (definite-time or inverse-time) and directional elements (forward, reverse or non-directional) are provided. A harmonic blocking function is integrated to restrain each stage independently.

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

    Selectable time characteristics (definite-time or inverse-time) and directional elements (forward, reverse or non-directional) are provided. A harmonic blocking function is integrated to restrain each stage independently.

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

    Selectable time characteristics (definite-time or inverse-time) and directional elements (forward, reverse or non-directional) are provided. Stage 3 can be selected as alarm purpose.

    • One stage undercurrent protection (37)

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

    Quickly detect failed circuit breakers with the built-in breaker failure detection elements and logic. It can be applied to single-breaker and dual-breaker applications.

    • Four stages undervoltage protection (27P)

    • 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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