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:
Jul. 07, 2015
Filed:
Mar. 03, 2011
Henrik Johansson, Vasteras, SE;
Joseph Menezes, Vasteras, SE;
Stefan Roxenborg, Vasteras, SE;
Tord Bengtsson, Vasteras, SE;
Henrik Johansson, Vasteras, SE;
Joseph Menezes, Vasteras, SE;
Stefan Roxenborg, Vasteras, SE;
Tord Bengtsson, Vasteras, SE;
ABB RESEARCH LTD., , CH;
Abstract
A method for adapting a ground fault detection to a change of an electrical machine condition, wherein the machine includes a winding. The electrical machine is in a first machine condition, a first reference value being defined for measured values of an electrical quantity. The ground fault detection includes continuously measuring the electrical quantity in the winding and detecting a ground fault based on the measured values of the electrical quantity and the first reference value. The method includes receiving a signal, detecting a change of machine condition based on the received signal, and changing to a second reference value for the measured values of the electrical quantity, the second reference value being different from the first reference value when the change of machine condition is detected.