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:
Nov. 28, 2006
Filed:
May. 18, 2004
Goeran Lindahl, Vacsteras, SE;
Erland Soerensen, Vacsteras, SE;
Goeran Lindahl, Vacsteras, SE;
Erland Soerensen, Vacsteras, SE;
Alstom Technology Ltd., Baden, CH;
Abstract
The invention relates to a method for detection of a ground fault (), which occurs in the vicinity of a neutral point (), in a polyphase electrical device which is operated at a fundamental frequency, in particular an electrical machine () or a transformer which has a number of windings (), which are associated with the individual phases, one end of each of which windings () is connected to the neutral point () and the other end of each of which windings () is connected directly to a power supply network via a power supply system connection (). Simple and reliable detection is achieved in that the change in the physical variables which is associated with a ground fault () is measured in the immediate vicinity of the ground fault (), and is evaluated.