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  • PCS-985G/GW/BG/RS Generator Relay

  • PCS-985 generator relay can be applied for turbo-dynamo, gasturbine, hydro, pumped storage and nuclear power generator with different connection modes. It supports conventional CT/ VT and ECT/EVT, and provides interfaces for power plant automation.

    For medium to large generator, two sets of PCS-985 protection can be used to achieve duplicated protection configuration. Two PCS-985 protections use different CT group, and main and backup protection in one PCS-985 share one group of CTs.

    • PCS-985G provides complete protection scheme for medium to large turbo-dynamo or nuclear power generator and an exciter or excitation transformer.
    • PCS-985GW provides complete protection scheme for medium to large hydro-generator and an exciter or excitation transformer.
    • PCS-985BG provides complete protection scheme for medium to large gas turbine generator and an exciter or excitation transformer.
    • PCS-985RS is designed for small to medium scale generator and exciter or excitation transformer.
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Generator Protection
  • Current differential protection of generator (87G)
  • Phase segregated transverse differential protection (87STG)
  • Incomplete current differential protection (87IG)
  • High sensitive neutral point transverse differential protection (87NTG)
  • Generator inter-turn protection (59NIT)
  • Voltage controlled overcurrent protection (50/51P)
  • Phase-to-phase impedance protection (21)
  • Fundamental zero-sequence voltage stator ground fault protection (64S1)
  • Zero-sequence overcurrent protection stator ground fault protection (64S)
  • Generator 3rd harmonic stator ground fault protection (64S2)
  • Generator stator ground fault protection with 20Hz voltage injection (64SInj, with RCS-985U)
  • Generator Ping-Pang type rotor ground fault protection (64R)
  • Rotor ground fault protection with low-frequency squarewave voltage injection (64RInj)
  • Stator overload protection (49S)
  • Negative-sequence overload protection (46G)
  • Generator shaft overcurrent protection (51GS)
  • Loss-of-excitation protection (40G)
  • Generator out-of-step protection (78)
  • Overvoltage protection (59)
  • Undervoltage protection (27)
  • Overexcitation protection (24)
  • Generator reverse power protection (32R)
  • Low forward power protection (32F)
  • Underfrequency protection (81U)
  • Overfrequency protection (81O)
  • Generator inadvertent energization protection (50/27)
  • Generator startup and shutdown protection (StShut)
  • LCI (Load Commutated Inverter) DC earth-fault protection
  • Breaker failure protection (50BF)
  • Excitation winding overload protection (49E)

Excitation Transformer/Exciter Protection
  • Current differential protection (87ET)
  • Overcurrent protection (50/51P)

Miscellaneous
  • Mechanical protection. (MR)
  • Fault detector. (FR)
  • Voltage and current drift auto adjustment.
  • VT circuit supervision (VTS)
  • CT circuit supervision (CTS)
  • Self diagnostic.
  • GPS clock synchronization.
  • Fault Recorder.
  • IEC61850 MMS & GOOSE for station bus
  • IEC60870-5-103 protocol.
  • MODBUS protocol.
  • Parallel calculation of double DSP system
    The hardware of the device comprises a 32-bit microprocessor and two 32-bit digital signal processors (DSP). Those processors can operate in parallel companied by fast A/D converter. The 32-bit microprocessor performs logic calculation and the DSP performs the protection calculation. High performance hardware ensures real time calculation of all protection relays within a sampling interval. On the premise of 24 samples per cycle, all data measurement, calculation and logic discrimination could be done within one sampling period. The event recording and protection logic calculation are completed simultaneously.
  • Independent fault detector
    Independent fault detectors in fault detector DSP module for connecting power supply of output relays. The relay can drive a tripping output only when protection element on protection DSP module operates with the fault detector in the fault detector DSP module operating simultaneously. This kind of independent supervision of tripping outputs using fault detectors can avoid any mal-operation possibly caused by any hardware component failure. This highly increases the security.
  • Configurable tripping output
    The tripping output contacts can be configured by tripping matrix and suitable to any mode of tripping.
  • Fault recording function
    Event records include 1024 binary input events and 1024 alarm events. Disturbance records including 64 fault reports, and 64 disturbance waveform, and file format of waveform is compatible with international COMTRADE91 and COMTRADE99 file. Analog inputs and binary inputs can be recorded, and three oscillography triggering mode are supported, which are protection pickup triggering, manual triggering on keypad of device, and remote triggering through PCS-PC software.
  • Integration of main and backup protection
    Main and backup protection are integrated in one set of protection device. Protection information is shared by all parts. The device can record all relevant waveform of any fault.
  • Reliable CT saturation detection
    Based on the operation sequence of DPFC restraint current element and DPFC differential current element of differential protection, external fault with CT saturation or internal fault can be distinguished correctly.
  • Integration of main and backup protection
    Main and backup protection are integrated in one set of protection device. Protection information is shared by all parts. The device can record all relevant waveforms of any fault.
  • Reliable CT saturation detection
    Based on the operation sequence of DPFC restraint current element and DPFC differential current element of differential protection, external fault with CT saturation or internal fault can be distinguished correctly.