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:
Jun. 12, 2012
Filed:
Oct. 16, 2009
Shiro Maruyama, Kanagawa, JP;
Takashi Nakajima, Kanagawa, JP;
Hiroyuki Hayata, Kanagawa, JP;
Kazuhide Bannai, Chiba, JP;
Kozo Matsushita, Kanagawa, JP;
Hideo Ishizuka, Tokyo, JP;
Shiro Maruyama, Kanagawa, JP;
Takashi Nakajima, Kanagawa, JP;
Hiroyuki Hayata, Kanagawa, JP;
Kazuhide Bannai, Chiba, JP;
Kozo Matsushita, Kanagawa, JP;
Hideo Ishizuka, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A gas insulated circuit breaker system has: a container that encapsulates insulating gas; a main contact in the container that opens/closes the main circuit; a resistor contact in the container, connected in parallel to the main contact, to be opened after elapse of a predetermined time after the main contact is opened and to be closed at a predetermined time before the main contact is closed; a resistor in the container, serially connected to the resistor contact and connected in parallel to the main contact together with the resistor contact; a temperature sensor that measures temperature of surrounding of the resistor; and a temperature estimation section that estimates a temperature of the resistor based on a timing of opening/closing operation of the main contact, a current flowing through the main circuit and the measured temperature.