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PCS-921 Breaker Failure Relay
  • The PCS-921 numerical relay provides protection for circuit breakers, which includes breaker failure protection, pole discrepancy protection, dead zone protection, phase/ negative sequence overcurrent protection, earth-fault protection, overvoltage protection, undervoltage protection, frequency protection, single and/or three-pole auto-reclosing and synchronism check functions. The PCS-921 relay employs the programmable logic, configurable I/Os and definable 3-color LEDs to provide flexibility for specific applications. Frequency tracking is used to minimize the sampling error caused by system frequency fluctuation. The PCS-921 relay adopts the advanced multi-processor platform, providing the interfaces to station bus and process bus respectively and supporting IEC 61850-8-1 MMS, GOOSE and IEC 61850-9-2 Sampling Value. In addition, the RJ-45 faceplate port serves for testing and setting in effort to make commissioning and maintenance easier.

  • Protection and Control Моnitoring and Measurement Communcation User Interfere
    • Breaker failure protection (50BF)

    • ŸPole discrepancy protection (62PD)

    • ŸDead zone protection (50DZ)

    • ŸFour stages of phase overcurrent protection (50/51P)

    • ŸFour stages of neutral overcurrent protection (50/51G)

    • ŸFour-stage negative sequence overcurrent protection (50/51Q)

    • ŸThree-stage undervoltage protection and overvoltage protection (27/59)

    • ŸOne-stage negative sequence overvoltage protection (59Q)

    • ŸFour-stage underfrequency protection and overfrequency protection (81)

    • ŸSynchronism check (25)

    • ŸSingle and/or three-pole auto-reclosing (79)

    • ŸVoltage and current drift auto adjustment

    • Frequency tracking

    • VT circuit supervision (VTS)

    • CT circuit supervision (CTS)

    • ŸSelf diagnostic

    • ŸEvent recorder including 1024 disturbance records, 1024 binary events, 1024 supervision events and 1024 operating logs

    • Disturbance recorder including 32 disturbance records with waveforms (The file format of disturbance recorder is compatible with international COMTRADE file.)

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

    • 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 two 100Base-FX optical Ethernet ports using IEC 61850, DNP3.0 or IEC 60870-5-103 over TCP/IP (Sharing two copper Ethernet ports)

    • ŸTwo RS-485 serial ports using IEC 60870-5-103

    • ŸOne RS-485 serial port for clock synchronization

    • ŸOptional Sampling value and GOOSE communication module with six/eight optical Ethernet ports using IEC 61850- 9-2 and IEC 61850-8-1 GOOSE

    • HMI interface with large-size LCD and 9-button keypad on the front panel

    • One front RJ-45 port for testing and setting

    • One RS-232 or RS-485 rear port for printer

    • Language selection – English + selected language

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