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:
Jan. 24, 2012
Filed:
Apr. 20, 2010
Zoran Gajic, Västerås, SE;
Bertil Lundqvist, Vasteras, SE;
Zoran Gajic, Västerås, SE;
Bertil Lundqvist, Vasteras, SE;
ABB Technology AG, , CH;
Abstract
A differential protection method in a power network for determining type of fault occurring within the power network. The power network includes a protected object having two or more ends, and a current differential protection device and a current transformer are arranged at each end. The method includes the steps obtaining, at a first end of the protected object, measured values from a second end of the protected object; comparing, at the first end, changes in measured values taken at the first end with changes in the measured values obtained from the second end; and determining, upon the step of comparing changes in measured values showing differing results, type of fault occurring within the power network.