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:
Mar. 05, 2013
Filed:
Sep. 04, 2009
Mirrasoul J. Mousavi, Cary, NC (US);
John J. Mcgowan, Allentown, PA (US);
James Stoupis, Durham, NC (US);
Vaibhav D. Donde, Raleigh, NC (US);
Mirrasoul J. Mousavi, Cary, NC (US);
John J. McGowan, Allentown, PA (US);
James Stoupis, Durham, NC (US);
Vaibhav D. Donde, Raleigh, NC (US);
ABB Research Ltd, Zurich, CH;
Abstract
A method and a protective device operable to perform the method are provided, wherein the method is for detecting and analyzing faults in a first cable and one or more other cables, which convey power in a three phase feeder system. Current magnitude in the first cable is compared to a threshold level. If the current magnitude exceeds the threshold level, the duration of the condition is measured. If the duration falls within a predetermined duration range, a predetermined time interval is allowed to pass and then a determination is made whether a fault is detected in the one or more other cables. If a fault is not detected in the one or more other cables, then a determination is made that a single phase fault has occurred in the feeder system.