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. 03, 2012
Filed:
Jan. 10, 2005
Masashi Sugiyama, Tokyo, JP;
Yukihiro Katayama, Tokyo, JP;
Kenji Tominaga, Tokyo, JP;
Hirohisa Satomi, Tokyo, JP;
Ichirou Shimoda, Tokyo, JP;
Masashi Sugiyama, Tokyo, JP;
Yukihiro Katayama, Tokyo, JP;
Kenji Tominaga, Tokyo, JP;
Hirohisa Satomi, Tokyo, JP;
Ichirou Shimoda, Tokyo, JP;
Hitachi-GE Nuclear Energy, Ltd., Hitachi-shi, Ibaraki, JP;
Abstract
A recirculation pump motor is supplied with a power from a unit auxiliary middle voltage bus through a power supply system including a first circuit breaker, a voltage source inverter, and a second circuit breaker electrically connected in series to provide a no-load operation by use of the voltage source inverter. The second circuit breaker may be multiplexed with more than one breaker electrically connected in series. An existing nuclear plant using a induction motor driving a hydraulic coupling mechanically coupled to a synchronous generator for driving the recirculation pump, such as an MfG set, may be subjected to a method of replacing the induction motor, the hydraulic coupling, and the synchronous generator with the voltage source inverter and a circuit breaker through electrically disconnection and removal.