Title: Turbine control system

Abstract: A turbine control system for changing two speed governing operations of a steam turbine from a throttle governing operation to a nozzle governing operation and vise versa by controlling steam control valves comprises function generators grouped according to the two speed governing operations and operated by a main control flow-rate request signal to produce function outputs which are applied to respective low-value gate circuits, means for comparing the sum of the outputs of the gate circuits and the main control flowrate request signal, and means for varying the main control flowrate request signal with the aid of the difference between the signals thus compared in such a manner that while one of the outputs of the gate circuits decreases, the other output increases to supplement the decrease, whereby the steam control valves are gradually operated with the output of the turbine being kept unchanged during the operating mode changing operation.

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Inventors: Sato, Seiko (Tokyo, JA)
Hiyama, Yutaka (Higashiyamato, JA)
Yokota, Mitsuhisa (Yokohama, JA)

Application Number: 610238
Filing Date: 1975-09-04
Publication_date: 1976-09-21
Assignee: Tokyo Shibaura Denki Kabushiki Kaisha (Kawasaki, JA)
Primary Class(es): 415/15 290/40R, 415/17
Other Classes:
US Patent Ref:

3340883	Sep, 1967	Peternel	415/15.
3342195	Sep, 1967	Wagner	415/15.
3446224	May, 1969	Zwick, Jr.	415/1.
3452258	Jun, 1969	Thompson	415/15.
3757130	Sep, 1973	Uchiyama et al.	415/17.
3891344	Jun, 1975	Brayenbah	415/17.

Other Refs:
Primary Examiner: Husar, C. J.
Assistant Examiner:
Attorney: Stevens, Davis, Miller & Mosher