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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
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Current transformer supervision function (CTS)
Voltage transformer supervision function (VTS)
Rotational speed signal supervision function (four rotational speed signal sensors, installed at turbine end and exciter end)
Optical fiber communication supervision
Torsional vibration modal divergence protection
Shaft cross section accumulative fatigue protection for alarming or tripping
Shaft section total fatigue alarm function