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:
Aug. 24, 1982
Filed:
Nov. 25, 1980
Sachio Tsunoda, Yokohama, JP;
Kaneo Sugishita, Yokohama, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kanagawa, JP;
Abstract
In a Francis type pump turbine, for the purpose of switching the operation of a synchronous dynamoelectric machine from synchronous condenser operation wherein compressed air is admitted into a runner chamber to force down water level therein so as to cause a runner to rotate in air, to a synchronous generator operation, the air is released from the runner chamber and an inlet valve and guide vanes are completely or nearly completely closed. Then the inlet valve and guide vanes are gradually opened until a predetermined degree of opening is reached while maintaining the degree of opening of the guide vanes to be larger than that of the inlet valve. After the predetermined degree of opening, both the inlet valve and the guide vanes are gradually opened. But at this time the degree of opening of the inlet valve is maintained to be larger than that of the guide vanes. To switch from the generator operation to the condenser operation the same characteristic curves are traced in the opposite direction.