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PCS-924S Stub Differential Relay
  • PCS-924S is a fully numerical stub differential relay which is mainly designed for protecting T-zone of one and a half breakers arrangement. The protection function of PCS-924S comprises of current differential protection, phase overcurrent protection and feeder line end fault protection. With its flexibility and the powerful PCS-Studio configuration tool, PCS-924S offers future-oriented busbar solutions with high investment security and low operating costs.


  • Protection Communication interface Communication protocol Digital application Cybersecurity Supervision Recording Measurement
    • Current Differential Protection (87STB)

    • Feeder Line End Fault Protection (50FLE)

    • Phase Overcurrent Protection (50P)


    • 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

    • Extendable 1000Base-SX optical Ethernet port for PRP and HSR

    • 1 RS-485 serial port for clock synchronization

    • 1 TTL serial port for clock synchronization

    • 1 BNC port for clock synchronization

    • 1 optical fiber port (ST-connector) for clock synchronization

    • 1 front RJ45 port for debugging

    • 1 rear RJ45 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)


    • IEC 61850 MMS Server

    • IEC 61850-8-1 GOOSE

    • IEC 61850-9-2LE SV

    • 4 100Base-TX electrical or 100Base-FX optical Ethernet port (station level)

    • Extendable 100Base-FX optical Ethernet port (process level)

    • Extendable 1000Base-SX optical Ethernet port (process level)

    • Clock synchronization

    • IRIG-B: IRIG-B via serial port (RS-485 or TTL level), BNC port (TTL level) or optical fibre port

    • PPS: Pulse per second (PPS) via serial port (RS-485 or TTL level), BNC port (TTL level), optical fibre port or binary input

    • IEEE 1588: Clock message based on IEEE 1588 via Ethernet network

    • SNTP: Unicast (point-to-point) & broadcast SNTP mode via Ethernet network

    • Clock messages: IEC 60870-5-103 protocol, Modbus protocol and DNP3.0 protocol


    • NERC CIP

    • IEC 62351

    • IEC 62443

    • IEEE 1686


    • CT circuit supervision

    • Self-diagnostic

    • DC power supply supervision


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


    • Current and voltage measurement at a 2.4KHz sampling rate

    • Current and voltage measurement at a 9.6KHz sampling rate


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