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  • PCS-915IC Centralized Busbar Relay

  • The PCS-915IC centralized busbar relay provides comprehensive protection solution for various arrangements of all voltage levels. The default busbar arrangements include single busbar with/without section, double busbar with/without section, double busbar with transfer bus, breaker-and-a-half arrangement and ring-breaker arrangement. The relay provides flexible configuration of the busbar topologies to meet specific applications. Due to its extensive CT input and I/O capability, the PCS-915IC is capable to protect up to 25 feeders.

    It provides fast and secure low impedance busbar protection with sub-cycle tripping time. Check zone and discrimination zone of differential protection are equipped in the relay to minimize the outage zone. Advanced and patented technologies are incorporated to improve sensitivity and security, such as weighted CT saturation detection method, DPFC current differential protection.

    The PCS-915IC is compatible with IEC 61850 station bus and process bus applications. It supports IEC 61850-8-1 MMS, GOOSE and IEC 61850-9-2 Sampling Value. The RJ-45 faceplate port is provided for testing and setting, allowing for easier commissioning and maintenance.

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Protection and Control
  • Busbar current differential protection (87B)
    • Phase current differential protection
    • DPFC differential protection
    • Voltage control element
    • CT saturation inhibit
    • Check zone and discrimination zone
  • Bus coupler/section protection
    • Breaker failure protection (50BF)
    • Dead zone protection (50DZ)
    • Pole disagreement protection (62PD)
    • Switch-onto-fault protection (50SOTF)
    • Overcurrent protection (50/51)
  • Feeder protection
    • Breaker failure protection (50BF)
    • Dead zone protection (50DZ)
    • Pole disagreement protection (62PD)
    • Overcurrent protection (50/51)
  • Voltage and current drift auto adjustment.
  • Frequency tracking.
    Monitoring and Measurement
    • Dynamic busbar replica
    • Isolator contact discrepancy alarm
    • CT failure supervision
    • VT failure supervision
    • Self diagnostic
    • Event recorder including 1024 change-of-binary-input events, 1024 supervision events and 1024 device logs
    • Disturbance recorder including 32 disturbance records with waveforms (The format is compatible with COMTRADE.)
    • 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)
    • Two RS-485 serial ports using IEC 60870-5-103
    • One RS-485 serial port for clock synchronization
    • Optional Sampling value and GOOSE communication module with 32 optical Ethernet ports using IEC 61850-9-2 and IEC 61850-8-1 GOOSE
    User Interface
    • 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
    • Assistant software - PCS-Explorer
  • Both traditional phase current differential protection and innovative DPFC current differential protection are provided in the relay, to ensure the high speed and high level of sensitivity. The typical operation time of current differential protection is less than 20 ms.
  • Up to 25 feeders can be connected and protected in one device, to provide all-in-one solution for busbar protection. This solution can implement cross-phase algorithms, such as negative/zero sequence voltage blocking element, negative/ zero sequence overcurrent element.
  • CT ratio compensation is integrated to provide users the selection flexibility of CT equipment and to avoid the interposing CTs.
  • Patented adaptive weighted anti-saturation algorithm is employed, together with traditional harmonic algorithm, to provide fast and reliable CT saturation detection.
  • Check zone current differential element and discrimination zone current differential element are integrated in the relay, to select the fault zone and to make a selective trip, so as to minimize the outage area.
  • The relay detects dynamic connection status of each feeder via disconnector auxiliary contacts, so as to dynamically include or exclude the current inputs for the current differential protection calculations.
  • A unique two-out-two logic is adopted in hardware design to improve security. Coordinating with the redundant scheme, this solution improves both security and dependability of protection system. The two independent data acquisition paths are provided to prevent mal-operation caused by component failure. One works as a fault detector and the other is designed for protection logic. Tripping outputs are supervised by both data acquisition paths.
  • Comprehensive flexibility is achieved via modular hardware design, scalable function library, programmable logics, configurable I/Os and definable LEDs. It allows users to create customized schemes for specific projects. 2 fixed LEDs and 18 definable 3-color LEDs (Green/Yellow/Red) are provided.
  • The relay is fully compatible with IEC 61850, including station bus communication and process bus communication. It provides up to 6 Ethernet ports for process bus with IEC 61850-9-2 Sampling Value and IEC 61850-8-1 GOOSE, as well as up to 4 Ethernet ports for station bus with IEC 61850- 8-1 MMS.