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PCS-915SC Centralized Busbar Relay
  • PCS-915SC centralized busbar relay integrates busbar differential protection, bus coupler/section protection (includes overcurrent protection, switch-onto-fault protection, dead zone fault protection, dual CTs BC/BS dead zone differential protection and breaker failure protection), feeder protection (includes overcurrent protection, dead zone fault protection and breaker failure protection), voltage protection (phase overvoltage protection and undervoltage protection) and frequency protection (overfrequency protection, underfrequency protection and frequency rate-of-change protection). With its flexibility and the powerful PCS-Studio configuration tool, PCS-915SC offers future-oriented busbar solutions with high investment security and low operating costs.


  • Protection Functions Measurement Functions Supervision Functions Communication
    • Busbar Differential Protection (87B)

    • BC/BS Dead Zone Fault Protection (50DZ)

    • BC/BS Dead Zone Differential Protection (87DZ)

    • Feeder Dead Zone Fault Protection (50DZ)

    • BC/BS Switch-onto-fault (SOTF) Protection (50SOTF)

    • Breaker Failure Protection (50BF)

    • Phase Overcurrent Protection (50/51P)

    • Earth Fault Overcurrent Protection (50/51G)

    • Phase Overvoltage Protection (59P)

    • Phase Undervoltage Protection (27P)

    • Overfrequency Protection (81O)

    • Underfrequency Protection (81U)

    • Frequency Rate-of-change Protection (81R)

    • External Binary Input Trip Busbar


    • Phase angle measurement

    • Differential current calculation

    • Sequence component calculation

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

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


    • Self-diagnostic

    • Frequency supervision

    • DC power supply supervision

    • CT circuit supervision

    • VT circuit supervision

    • Disconnector supervision


    • 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 or Modbus

    • One RS-485 serial port for clock synchronization

    • One BNC 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 and one rear RJ-45 port for debugging


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