The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 11, 1977
Filed:
Jun. 27, 1975
Francesco Lardi, Pittsburgh, PA (US);
Uri G Ronnen, Monroeville, PA (US);
Westinghouse Electric Corporation, Pittsburgh, PA (US);
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.