Steam turbine valve positioning system having throttle valve tes

Details Steam turbine valve positioning system having throttle valve tes Steam turbine valve positioning system having throttle valve tes

1975-06-27

1977-01-11

Queisser, Richard C.

Measuring and testing

Blower, pump, and hydraulic equipment

73 4R, 415 16, G01L 2700

Patent

active

040020657

ABSTRACT:
A digital electrohydraulic steam turbine control system that generates a feedforward total steam flow demand signal to position the governor valves singly or sequentially in accordance with a dynamic nonlinear representation of steam flow vs. valve lift position having provision for testing the throttle valves while the turbine is operating in either the single or sequential mode and without effectively disturbing the load on the turbine and without the necessity of turbine operational feedback loops in service, is disclosed. Decremental and incremental flow changes for each of the governor valves in the test path and the non-test path, respectively, are calculated iteratives in accordance with a non-linear valve flow vs. valve lift position characterization for the total steam flow to the turbine. Subsequent to the test, the control valves are repositioned to the normal pretest sequential or operating mode by incrementally changing the flow of all the valves toward the normal operating mode position so that the net total flow is unchanged.

REFERENCES:
patent: 2617438 (1952-11-01), Doran
patent: 2866470 (1958-12-01), Hold et al.
patent: 3552872 (1971-01-01), Giras et al.
patent: 3744311 (1973-07-01), Kalverboer

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