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. 02, 1998
Filed:
Jul. 31, 1996
Applicant:
Inventor:
Horst Plettner, Hanau, DE;
Assignee:
ABB Patent GmbH, Mannheim, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01H / ; F15B / ;
U.S. Cl.
CPC ...
218154 ; 91416 ; 91 38 ; 137100 ; 200 / ;
Abstract
A hydraulic device for a moving contact piece of a high-voltage power circuit breaker includes a reservoir and a low-pressure tank for hydraulic fluid. A changeover valve has a slide for alternately connecting one of the spaces in the drive-piston/cylinder configuration to the reservoir and to the low-pressure tank. At least one separately controlled and arranged control piston is associated with the slide. A servovalve controls the at least one control piston to drive the slide from a first position to a second position, i.e., from a connected position to a disconnected position of the power circuit breaker.