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. 18, 2002
Filed:
Nov. 05, 1999
Mario Bilac, Lawrenceville, GA (US);
Jerry M. Green, Tucker, GA (US);
Siemens Energy & Automation, Inc., Alpharetta, GA (US);
Abstract
An apparatus ( ) (FIG. ) for differentially sensing a ground fault in a power distribution circuit is configured to route a plurality of power signals, the power signals when summed resulting in a zero sum signal. The apparatus ( ) includes a circuit element (e.g., a resistor) ( ), first and second current transformers (CTs) ( ), and a routing circuit ( ). The first and second current transformers ( ) are configured to sense first and second power signals and to generate first and second sense signals representative of the first and second power signals, respectively. The routing circuit ( ) is configured to receive the first and second sense signals to provide a residual signal across the circuit element ( ).