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PCS-915SD Distributed Busbar Relay
  • PCS-915SD distributed 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) and feeder protection (includes overcurrent protection, dead zone fault protection and breaker failure protection). With its flexibility and the powerful PCS-Studio configuration tool, PCS-915SD offers future-oriented busbar solutions with high investment security and low operating costs.


  • Protection and Control of the Bay Unit Protection and Control of the Central Unit Measurement Functions Supervision Functions Communication
    • Bus coupler/section protection

    Re-tripping of breaker failure protection (50BF)

    Overcurrent protection (50/51)

    • Feeder protection

    Re-tripping of breaker failure protection (50BF)

    Overcurrent protection (50/51)


    • Busbar current differential protection (87B)

    • Bus coupler/section protection

    Breaker failure protection (50BF)

    Dead zone protection (50DZ)

    BC/BS dead zone differential protection (87DZ)

    Switch-onto-fault protection (50SOTF)

    • Feeder protection

    Breaker failure protection (50BF)

    Dead zone protection (50DZ)

    • External Binary Input Trip Busbar

    • Voltage and current drift auto adjustment

    • Frequency tracking


    • 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

    • 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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