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PCS-9671S Transformer Relay
  • PCS-9671S has been designed specifically for the protection of various type power transformers (up to 3 measuring points), including two-winding transformers, three-winding transformers, auto-transformers, as well as shunt reactors, in 110kV voltage level and below. PCS-9671S provides the main protection elements, such as: current differential protection and restricted earth fault protection. With its modular structure, flexibility and the powerful PCS-Studio engineering tool, PCS-9671S offers future-oriented system solutions with high investment security and low operating costs.


  • Protection Functions Supervision Functions Measurement and Metering Communication
    • Transformer differential protection (87T)

    • Inrush blocking

    • CT saturation blocking

    • Overexcitation blocking

    • CT circuit failure blocking

    • Amplitude compensation

    • Phase angle compensation

    • Reactor differential protection (87R)

    • Restricted earth-fault protection (64REF)

    • Phase overcurrent protection (50/51P)

    • Earth-fault protection (50/51G)

    • Current drift auto adjustment


    • CT circuit failure Supervision (CTS)

    • Tripping circuit supervision (TCS)

    • Self diagnostic

    • Powerful faults recording (max. buffer for 10,000 sampled points at 1.2 or 9.6 kHz)

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

    • Disturbance recorder including 64 disturbance records with waveforms (the file format of disturbance recorder is compatible with international COMTRADE file)

    • Single line diagram representation in display


    • Positive sequence currents, zero sequence currents and phase angles

    • DC analogue inputs (0~±20mA or 0~±10V) 

    • DC analogue outputs (4~20mA, 0~10V, 0~5V or 0~20mA)


    • Support of various protocols

    Modbus, DNP3.0, IEC 60870-5-103, IEC 61850 Ed.1 & Ed.2, IEC 61850 MMS Server, IEC 61850-8-1 GOOSE,IEC 62439 Parallel Redundancy Protocol (PRP), IEC 62439 High-availability Seamless Ring (HSR) Redundancy Protocol, IEEE 802.1w Rapid Spanning Tree Protocol (RSTP).

    • Up to four 10Base-T/100Base-TX copper Ethernet ports

    • Up to four 100Base-FX optical Ethernet ports

    • Two RS-485 serial ports for communication, the second one could be used as a RS-232 port for printer.

    • One RS-485/TTL serial port for clock synchronization

    • One BNC port for clock synchronization

    • One ST-connector port for clock synchronization

    • Two RJ45 debugging ports (front and rear)


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