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PCS-994S Frequency and Voltage Controller
  • PCS-994S frequency and voltage controller provides fast and selective generation shedding and load shedding due to a frequency or voltage abnormality in the power network, for avoiding the system crash and a large area blackout, maintaining the stability of the system voltage and frequency. With its flexibility and the powerful PCS-Studio configuration tool, PCS-994S offers future-oriented system solutions with high investment security and low operating costs.

    PCS-994S is applicable not only to conventional substations, but also to digital substations. It supports IEC 61850 Editions 1 and 2 and provides GOOSE and SV network interfaces with high real-time performance. The process level network supports peer-to-peer (P2P) mode and networking mode, including single network mode and dual network mode. The station level network could also receive and send MMS messages (such as interlocking signals) or process level GOOSE messages (such as trip signals).


  • Protection and Control Supervision Functions Measurement and Metering Functions Communication
    • Under-frequency Protection (81U)

    • Over-frequency Protection (81O)

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

    • Positive-sequence Under-voltage Protection (27Pos)

    • Positive-sequence over-voltage Protection (59Pos)


    • VT circuit failure supervision (VTS)

    • 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


    • U, f

    • du/dt, df/dt

    • Positive, negative and zero sequences

    • Max.15th harmonics


    • 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 61850-9-2LE SV, 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 can be used as a RS-232 port for printer

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

    • One ST-connector port for clock synchronization

    • Two RJ45 debugging ports (front and rear)


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