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:
Apr. 16, 2002
Filed:
Aug. 01, 2001
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02B 1/20 ;
U.S. Cl.
CPC ...
H02B 1/20 ;
Abstract
To provide a gas insulation switch reducing the SF gas use amount without damaging the insulation performance and arc extinguishing performance, the present invention uses SF gas as insulating gas to be charged in the grounding tank of a unit having a switching unit of the breaker the disconnecting switches and and the grounding switches and for example, the line unit and uses gas having a smaller warming coefficient than that of SF gas, for example, nitrogen gas or air as insulating gas to be charged in the grounding tank of a unit having no switching unit, for example, the main bus units and and the connection bus unit