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  • PCS-902 Line Distance Relay

  • The PCS-902 provides comprehensive protection and control solutions for transmission lines with high-speed sub-cycle distance element. The PCS-902 is intended for application on overhead lines and underground cables with diverse voltage levels. These include series compensated, double- circuit, heavily loaded, weak in feed (WI), short and long lines. It can meet the requirements of single-pole or three- pole tripping; it also provides single and/or three-pole auto- reclosing functions. The PCS-902 is suitable for single and dual- breaker applications, providing optional dual CT inputs, dual breaker failure protections, dual breaker auto-reclosing and dual synchro-checks. Additionally, the relay integrates the remote/ local control of circuit breaker, disconnector and earth switch.

    The PCS-902 employs a wide range of innovative patented technologies, such as DPFC (Deviation Power Frequency Component) distance protection and unique power swing blocking logic. Thus, guaranteeing accurate and reliable operations.

    The PCS-902 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 smoother commissioning and maintenance.

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Protection and Control
  • Five zone phase-to-phase distance protection (21P)
  • One zone phase-to-phase distance protection for pilot scheme (85)
  • Five zone phase-to-ground distance protection (21G)
  • One zone phase-to-ground distance protection for pilot scheme (85)
  • High-speed DPFC distance protection (21D)
  • Pilot directional earth-fault protection (85)
  • Four stage phase overcurrent protection (50/51P)
  • Four stage neutral overcurrent protection (50/51G)
  • Three stages negative-sequence overcurrent protection (50/51Q)
  • Breaker failure protection for one or two breakers (50BF)
  • Stub overcurrent protection (87STB)
  • Three stage undervoltage protection and three stage overvoltage protection (27/59)
  • Four stage underfrequency protection and four stage overfrequency protection (81)
  • One stage negative-sequence overvoltage protection (59Q)
  • Phase overcurrent protection during VT failure (50P VT)
  • Neutral overcurrent protection during VT failure (50G VT)
  • Switch-onto-fault (SOTF) logic
  • Unique power swing blocking releasing logic (PSBR)
  • Out-of-step protection (78)
  • Broken conductor protection (46BC)
  • Dead zone protection (50DZ)
  • Thermal overload protection (49)
  • Pole discrepancy protection (62PD)
  • Reverse power protection (32R)
  • Single and/or three-pole auto-reclosing (single-breaker or dual-breaker ). (79)
  • Remote/local control
  • Synchronism check (25)
  • Voltage and current drift auto adjustment.
  • Frequency tracking.
Monitoring and Measurement
  • Energy measurement (active and reactive energies for import and export)
  • CT failure supervision
  • VT failure supervision
  • Fault phase selection
  • Fault Locator with parallel-line compensation
  • 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.)
  • Pilot communication channel supervision
  • System frequency supervision
  • Clock synchronization using IRIG-B, SNTP, PPS (Pulse-Per- Second) and PPM (Pulse-Per-Minute), IEEE 1588

  • Communications
  • Optional single- or dual- pilot channels (fiber optic), complying with G.703 and C37.94
  • 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 six 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
  • The unique DPFC protection principle, firstly introduced by NR Electric, employs superimposed increscent quantities as protection criteria, which provides high speed fault clearance and is immune to power swing and load fluctuation.
  • 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.
  • Self-adaptive floating threshold which only reflects deviation of power frequency components improves the sensitivity and reliability during load fluctuation and system disturbance.
  • The unique power swing blocking logic can properly supervise the distance protection during power swing, which ensures the distance protection will operate correctly for internal faults during power swing, and prevents distance protection from mal-operation during power swing.
  • Fast clearance of the faults within the protected zone is achieved by this relay. The typical operating time is less than 10 ms for close-up faults, less than 15ms for medium-zone faults and less than 25ms for remote-end faults.
  • 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 the 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.
  • Powerful disturbance recording function is integrated in the relay for post-fault analysis. Up to 64 disturbance records can be stored in non-volatile memory. Each report includes 250-cycle to 500-cycle waveform records with 12-cycle pre- fault waveform.