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:
May. 17, 2011
Filed:
May. 14, 2007
Applicant:
Daqing Hou, Boise, ID (US);
Inventor:
Daqing Hou, Boise, ID (US);
Assignee:
Schweitzer Engineering Laboratories, Inc., Pullman, WA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R 31/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The system and methods monitor odd harmonics within a power distribution system quantity using a special digital filter. A normal level of odd harmonics for the monitored quantity is established. Over predetermined time periods, the odd harmonics within the power distribution quantity are compared to the normal level, and a determination of whether a high-impedance fault is present in the monitored power distribution system is made.