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PCS-978S Transformer Relay
  • PCS-978S has been designed specifically for the protection of various type power transformers, including two-winding transformers, three-winding transformers (up to 6 branches), as well as auto-transformers in any voltage level. PCS-978S is the main protection for the transformer and contains many other protection, control and monitoring functions. With its modular structure, flexibility and the powerful PCS-Studio engineering tool, PCS-978S offers future-oriented system solutions with high investment security and low operating costs.

  • Protection and Control Monitoring and Measurement Communication
    • Transformer differential protection (87T)

    • Inrush blocking

    • CT saturation blocking

    • Overexcitation blocking

    • CT circuit failure blocking

    • Amplitude compensation

    • Phase angle compensation

    • Restricted earth-fault protection (64REF)

    • Winding differential protection (87W)

    • Overexcitation protection (24)

    • Mechanical protection (MR)

    • Phase overcurrent protection (67P, 50/51P)

    • Earth-fault protection (67G, 50/51G)

    • Negative-sequence overcurrent protection (67Q, 50/51Q)

    • Undervoltage protection (27P)

    • Overvoltage protection (59P)

    • Zero-sequence overvoltage protection (59G)

    • Switch-onto-fault (SOTF) logic

    • Remote/local control

    • Voltage and current drift auto adjustment

    • Frequency tracking

    • Energy measurement (active and reactive energies for import and export)

    • CT circuit failure supervision

    • VT circuit failure supervision

    • 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.)

    • System frequency supervision

    • Clock synchronization using IRIG-B, SNTP, PPS (Pulse-Per- Second) and PPM (Pulse-Per-Minute) , IEEE1588

    • 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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