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. 09, 2015
Filed:
Feb. 23, 2011
Applicant:
Dieter Dohnal, Lappersdorf, DE;
Inventor:
Dieter Dohnal, Lappersdorf, DE;
Assignee:
MASCHINENFABRIK REINHAUSEN GMBH, Regensburg, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H 7/04 (2006.01); H02H 7/055 (2006.01); H01F 29/04 (2006.01); H01H 9/00 (2006.01);
U.S. Cl.
CPC ...
H02H 7/055 (2013.01); H01F 29/04 (2013.01); H01H 9/0038 (2013.01);
Abstract
The invention relates to an on-load tap changer for switching among winding taps of a step transformer without interruption. According to the invention, in each auxiliary current branch of the on-load tap changer, which operates with vacuum switching tubes as switching elements, additional switches are provided in series with the vacuum switching tubes and the respective winding tap. Said additional switches cause a complete galvanic isolation of the vacuum switching tubes in the auxiliary current branches in steady-state operation.