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PCS-985TI Transformer Relay

  • PCS-985TI is a high performance numerical transformer protection device, which integrates main and backup protection into one device. It provides complete protection of a transformer in any voltage level, and is typically applied for startup/standby transformer or auxiliary transformer of power plant with multiple branches, and main transformer, etc. It also provides basic protection of a two-winding main transformer and one or two auxiliary transformer. 

    PCS-985TI provides up to 80 analog input channels including current and voltage inputs. The transformer protections are configurable. Ancillary functions of fault diagnostic, disturbance records, event records and communication function are integrated in the device.


    • Main Transformer Protection Step-down Transformer Protection Miscellaneous

    • ŸCurrent differential protection (87T)

    • ŸTransformer restricted earth fault protection (64REF)

    • ŸNegative-sequence Overcurrent protection (50/51Q)

    • Overexcitation protection (24)

    • ŸPhase overcurrent protection (50/51P)

    • ŸPhase overcurrent alarm elements (51PAlm)

    • ŸGround overcurrent protection (50/51G)

    • ŸPhase overvoltage protection (59P)

    • ŸPhase undervoltage protection (27P)

    • ŸResidual overvoltage protection (59G)

    • ŸOverfrequency protection (81O)

    • ŸUnderfrequency protection (81U)

    • Rate-of-frequency-change protection (81R)

    • Thermal overload protection (49)

    • ŸImpedance protection (21)

    • ŸBreaker failure protection (50BF)

    • ŸPole disagreement protection (62PD)

    • ŸBreaker flashover protection (50F)

    • ŸMechanical protection (MR)

    • ŸCurrent differential protection (87T)

    • Transformer restricted earth fault protection (64REF)

    • Phase overcurrent alarm elements (51PAlm)

    • ŸResidual overvoltage protection (59G)

    • ŸStep-down transformer HV side phase overcurrent protection (50/51P)

    • ŸStep-down transformer LV side phase overcurrent protection (50/51P)

    • ŸStep-down transformer LV side ground overcurrent protection (50/51G)

    • Fault 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

    • ŸIEC60870-5-103 protocol

    • ŸMODBUS protocol

    • DNP 3.0 protocol

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