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. 02, 2013
Filed:
Feb. 26, 2008
Ulf Andersson, Raleigh, NC (US);
Hans Bjorklund, Ludvika, SE;
John Daniel, Apex, NC (US);
David Dickmander, Raleigh, NC (US);
Ulf Andersson, Raleigh, NC (US);
Hans Bjorklund, Ludvika, SE;
John Daniel, Apex, NC (US);
David Dickmander, Raleigh, NC (US);
ABB Technology AG, Zurich, CH;
Abstract
A distribution and power transformer has its primary connected to the high voltage bus of the network and its secondary connected to a switching device. Upon the occurrence of a condition known to cause a dynamic overvoltage (DOV) and the occurrence of the DOV, a control system causes the switching device to change from a nonconductive mode to a conductive mode in less than the time for one cycle of the operating frequency of the AC network. This change in switching device conduction places a short circuit across the transformer secondary and thus mitigates the DOV.