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PCS-987R Torsional Stress Relay

  • Sub-synchronous oscillations (SSO) can occur when the turbinegenerators are connected to the power grid with some electrical cases include: transmission line series capacitors, HVDC converters, large-scale wind power generation, etc. Under the action of SSO, the shaft system of turbine-generator will be in a state of torsional vibration, resulting in fatigue loss. In some severe cases, it may lead to the shaft cracks, bolt cut or coupling twist.

    PCS-987R is a digital protective relay of torsional stress relay (TSR) which provides monitoring and protection of the torsional vibration for large-scale thermal power, nuclear power and other power generation units.

    • Miscellaneous functions Protective Functions

    • ŸCurrent transformer supervision function (CTS)

    • ŸVoltage transformer supervision function (VTS)

    • ŸRotational speed signal supervision function (four rotational speed signal sensors, installed at turbine end and exciter end)

    • ŸOptical fiber communication supervision


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    • Torsional vibration modal divergence protection

    • Shaft cross section accumulative fatigue protection for alarming or tripping

    • Shaft section total fatigue alarm function

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    Catalog
    PCS-987R Torsional Stress Relay
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