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:
May. 18, 2010
Filed:
Feb. 18, 2009
Stefan G. Johansson, Vasteras, SE;
Marek Fulczyk, Cracow, PL;
Tord Bengtsson, Vasteras, SE;
Sture Lindahl, Lund, SE;
Gabriel Olguin, Santiago, CL;
Stefan G. Johansson, Vasteras, SE;
Marek Fulczyk, Cracow, PL;
Tord Bengtsson, Vasteras, SE;
Sture Lindahl, Lund, SE;
Gabriel Olguin, Santiago, CL;
ABB Research Ltd., , CH;
Abstract
The present invention relates to a ground fault detection arrangement for a synchronous three-phase electrical machine, and an electrical system comprising a ground fault detection arrangement and a synchronous three-phase electrical machine. The ground fault detection arrangement injects an off-nominal frequency voltage between a neutral point of the synchronous three-phase electrical machine and ground and measure resultant currents to detect a ground fault.