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PCS-985GI Generator Relay

  • PCS-985GI is a 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-985GI can be applied for turbo-dynamo generator, gas-turbine generator, hydro generator and nuclear power generator with different connection modes.

    PCS-985GI provides up to 56 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)

    • ŸCT saturation detection (CTS)

    • ŸSelf diagnostic

    • ŸGPS clock synchronization

    • ŸFault recorder

    • ŸIEC61850 MMS & GOOSE for station bus

    • IEC60870-5-103 protocol

    • MODBUS protocol

    • DNP 3.0 protocol

    • Differential protection (87ET)

    • Overcurrent protection (50/51P)

    • ŸCurrent differential protection (87G)

    • ŸIncomplete current differential protection (87IG)

    • Phase segregated transverse differential protection (87STG)

    • ŸNeutral point transverse differential protection (87NTG)

    • ŸVGenerator inter-turn protection (59NIT)

    • ŸStator overload protection (49S)

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

    • ŸZero-sequence overcurrent protection stator ground fault protection (64S)

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

    • ŸGenerator stator ground fault protection with 20Hz voltage injection (64SInj)

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

    • ŸRotor ground fault protection with low-frequency squarewave 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)

    • Breaker failure protection (50BF)

    • Mechanical protection (MR)

    • Voltage balance protection (60)

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    PCS-985GI Generator Relay
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