Turbine control system

Details Turbine control system Turbine control system

F - Mech Eng,Light,Heat,Weapons

01

K

341/12

F01K 7/16 (2006.01)

Patent

CA 1036691

TURBINE CONTROL SYSTEM ABSTRACT OF THE DISCLOSURE 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 sig- nals 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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