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. 18, 2001
Filed:
Mar. 22, 1999
Hitachi, Ltd., Tokyo, JP;
Abstract
A gas insulation switch has a container charged with insulating gas which contains an electric conductor and at least a pair of contactors. The container is divided into a plurality of sections. For the sections which have no switching devices or separable contactors, a different insulating gas is used as compared with that for the sections having breakers or separable contactors. In particular, in the section of the container, such as a grounding tank, that contains only electric conductors without separable contactors, an insulating gas having a smaller earth warming coefficient or global warming coefficient than that of SF,gases is used. On the other hand, for the section of the grounding tank which contains a breaker or switch having separable contactors, an SF,insulating gas is used. Since SF,gas is known to have a high earth or global warming coefficient, as compared with air or nitrogen gas, the SF,gas is only used as the insulating gas in the grounding tank for the sections in which superior arc extinguishing performance is required. Accordingly, the gas insulation switch has a reduced requirement for SF,gas.