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:
Jul. 21, 1998
Filed:
Feb. 07, 1997
Wataru Tamura, Hitachi, JP;
Toru Tsubaki, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A puffer-type gas insulated interrupter has stationary and moving main contacts, stationary and moving arc contacts for discharging an arc, and a puffer cylinder for electric arc suppression. At the time of current interruption, the puffer cylinder moves together with the moving arc contact to blow electric insulation gas to the arc between the stationary and moving arc contacts. The blown gas flows between the arc contacts and is then discharged through a gas discharge passage. A duplex puffer chamber is provided in the gas discharge passage near the moving arc contact. The duplex puffer chamber holds or confines the insulation gas, and causes the same to be heated and pressurized by the arc and to blow out toward the stationary arc contact. A gas flow from the duplex puffer chamber cooperates with a gas flow from the puffer cylinder to effectively suppress the arc, and therefore the gas pressure in the puffer cylinder can be reduced, so that an operating force for the interrupter can be reduced.