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PCS-985GE Generator Relay

  • PCS-985GE is a kind of high performance numerical generator protection device, which integrates main and backup protection into one device. It provides complete protection of a generator in power plant, and it also provides basic protection of a generator and an excitation transformer. PCS-985GE can be applied for turbo-dynamo generator, gas-turbine generator, hydro generator, pumped storage generator and nuclear power generator with different connection modes.

    PCS-985GE provides up to 28 analog input channels including current and voltage inputs. The generator protections are configurable. Ancillary functions of fault diagnostic, disturbance records, event records and communication function are integrated in the device.


    • Miscellaneous Excitation Transformer Protection Generator Protection

    • ŸFault detector (FR)

    • ŸVoltage and current drift auto adjustment.

    • ŸVT circuit supervision (VTS)

    • ŸCT circuit supervision (CTS)

    • CT saturation detection

    • ŸSelf diagnostic

    • ŸGPS clock synchronization

    • ŸFault recorder

    • ŸIEC61850 MMS & GOOSE for station bus

    • ŸIEC60870-5-103 protocol

    • ŸMODBUS protocol

    • ŸDNP 3.0 protocol

    • Differential protection (87ET)

    • Overcurrent protection (50/51P)

    • ŸCurrent differential protection (87G)

    • Neutral point transverse differential protection (87NTG)

    • ŸGenerator inter-turn protection (59NIT)

    • ŸStator overload protection (49S)

    • ŸFundamental zero-sequence voltage stator ground fault protection (64S1)

    • Generator 3rd harmonic stator ground fault protection (64S2)

    • ŸGenerator Ping-Pang type rotor ground fault protection (64R)

    • ŸRotor ground fault protection with low-frequency square-wave voltage injection (64RInj)

    • ŸGenerator rotor winding overload protection (49E)

    • ŸGenerator inadvertent energization protection (50/27)

    • ŸGenerator out-of-step protection (78)

    • ŸGenerator startup and shutdown protection (StShut)

    • ŸGenerator shaft overcurrent protection (51GS)

    • ŸNegative-sequence Overload protection (46G)

    • ŸGenerator reverse power protection (32R)

    • ŸGenerator low forward power protection (32F)

    • ŸOverexcitation protection (24)

    • ŸLoss of excitation protection (40G)

    • ŸGenerator phase overcurrent protection (50/51P)

    • ŸPhase overvoltage protection (59P)

    • ŸUndervoltage protection (27P)

    • ŸOverfrequency protection (81O)

    • ŸUnderfrequency protection (81U)

    • ŸImpedance protection (21)

    • ŸBreaker failure protection (50BF)

    • ŸMechanical protection (MR)

    • Voltage balance protection (60)

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    PCS-985GE Generator Relay
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