Patent ID: 11933183
Assignee: TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 5:
6. A steam turbine valve abnormality monitoring system that monitors an abnormality in opening degree control of a steam turbine valve driven by a steam turbine valve drive device including: a cylinder housing a piston disposed on an operating rod operating the steam turbine valve and having a load side oil chamber and an unload side oil chamber partitioned by the piston; a bidirectional pump that selectively supplies hydraulic oil to the load side oil chamber and the unload side oil chamber; a servomotor that drives the bidirectional pump; a control unit that controls the servomotor; and an oil storage unit supplied with the hydraulic oil leaked from the bidirectional pump, the steam turbine valve abnormality monitoring system comprising:
a detection unit that detects a state of the steam turbine valve or the steam turbine valve drive device;
a determination unit that determines whether or not the abnormality has occurred in opening degree control of the steam turbine valve based on a detected result of the detection unit; and
an abnormality processing unit that issues an alarm or issues a stop command of a steam turbine when the determination unit determines that the abnormality has occurred in opening degree control of the steam turbine valve, wherein
the abnormality processing unit issues a stop command for closing another steam turbine valve installed on an upstream side relative to the steam turbine valve in a steam flow path in which the steam turbine valve is installed, when the determination unit determines that the abnormality has occurred in opening degree control of the steam turbine valve.