Power plants – Motive fluid energized by externally applied heat – Process of power production or system operation
Patent
1991-07-15
1992-07-28
Ostrager, Allen M.
Power plants
Motive fluid energized by externally applied heat
Process of power production or system operation
60657, F01K 1302
Patent
active
051331896
ABSTRACT:
A system is provided for independently testing trip valves in a multi-valve electro-hydraulic trip control system for a steam turbine. The electro-hydraulic trip control system features first and second channels arranged in series to control the pressure of a hydraulic fluid supplied to the actuator of the steam turbine throttle valve. Each of the channels has first and second trip valves arranged in parallel. First and second orifices are arranged in parallel with the first and second channels, respectively. First and second pressure switches are adapted to sense the pressure in the hydraulic fluid downstream of the first orifice. A programmable controller is programmed to test each of trip valves individually by individually opening and closing each of the trip valves sequentially and determining whether the signals from the pressure switches indicate that the trip valve being tested has opened. The programmable controller is programmed to indicate a valve failure should one of the trip valves fail to open.
REFERENCES:
patent: 4554788 (1985-11-01), Hwang et al.
Ostrager Allen M.
Westinghouse Electric Corp.
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