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:
Apr. 12, 1977
Filed:
Feb. 19, 1975
Jack R Smith, Pittsburgh, PA (US);
Leonard H Burrows, Gibsonia, PA (US);
Westinghouse Electric Corporation, Pittsburgh, PA (US);
Abstract
In a primary or backup control system for operating a gas turbine, a blade path temperature limit signal is generated which acts as a check on a fuel scheduling signal to the turbine which might otherwise cause excursion of the blade path temperature beyond prescribed limits. The means for generating the blade path temperature limit signal is adapted however so that a preliminary error signal is conditioned to behave in one manner in response to a condition of increasing temperature and in another manner to a condition of decreasing temperature. This two-way response is achieved by utilizing a plurality of proportional signal limiters, each one of which is matched to or tuned in accordance with the characteristics of the gas turbine. Further, the response duality is automatic and subject to the particular condition of temperature change which obtains. In addition, means are provided for generating a temperature limit signal which is clamped to a fixed, predetermined percentage of the fuel scheduling signal. This signal is employed, under appropriate conditions, in place of the conditioned error signal to insure that the conditioned error signal does not otherwise set the fuel scheduling signal at less than the fixed percentage above its 100% value. Acting in concert, the means for conditioning the preliminary error signal and the means for generating the clamped temperature signal yield increased turbine protection, greater operating stability and more rapid control response where permissible.