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. 11, 2011
Filed:
Jul. 02, 2007
William Davison, Cedar Rapids, IA (US);
Ryan James Moffitt, Coralville, IA (US);
Richard Allen Studer, Ii, Wesley, IA (US);
Steve M. Meehleder, Cedar Rapids, IA (US);
William Davison, Cedar Rapids, IA (US);
Ryan James Moffitt, Coralville, IA (US);
Richard Allen Studer, II, Wesley, IA (US);
Steve M. Meehleder, Cedar Rapids, IA (US);
Other;
Abstract
A method and system to detect currents in the saturation region of a current transformer for a circuit breaker is disclosed. An example method is sensing a fault condition with a current transformer in a circuit breaker. The characteristic curve of the current transformer in a saturation mode is determined based on peak current. A current is received on the transformer. A secondary current is output from the transformer. It is determined whether the secondary current is indicative of a fault current in the saturation mode of the transformer. The breaker is tripped if the secondary current is indicative of a fault current.