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:
Jun. 09, 2015
Filed:
Oct. 12, 2012
Rockwell Automation Technologies, Inc., Mayfield Heights, OH (US);
Zhongyuan Cheng, Cambridge, CA;
Yuan Xiao, Kitchener, CA;
Ghodratollah Esmaeili Rineh, West Vancouver, CA;
Manish Pande, Cambrdige, CA;
Navid Zargari, Cambridge, CA;
Rockwell Automation Technologies, Inc., Mayfield Heights, OH (US);
Abstract
Power converters and control techniques are presented in which capacitor degradation is detected according to negative sequence current by computing an uncompensated negative sequence current and a negative sequence voltage, compensating the negative sequence current based on the negative sequence voltage, comparing the compensated or uncompensated negative sequence current with an automatically calculated threshold and selectively identifying suspected degradation of one or more capacitors if the compensated negative sequence current exceeds the threshold value. The method can be used for power converters, control devices or protection relays for shunt capacitors or filters used in power systems.