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:
Sep. 27, 1983
Filed:
Dec. 29, 1980
Sachio Tsunoda, Yokohama, JP;
Katsunori Shirasu, Yokohama, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
A method for operating pumps in a pumping-up power plant having a single speed reversible pump turbine and a booster pump, the booster pump being provided in a branch pipe which is provided in parallel with a portion of a draft tunnel between the pump turbine and a lower reservoir, is disclosed. The method includes the steps of initiating the closing of a first inlet valve at the discharge side of the pump turbine, disconnecting the pump turbine and the booster pump simultaneously from an outer electric power system to which the pump turbine and the booster pump are connected, after an opening of the first inlet valve is closed to a predetermined value, and then closing the first inlet valve completely.