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:
Nov. 02, 2021
Filed:
Jan. 23, 2020
Applicant:
Schweitzer Engineering Laboratories, Inc., Pullman, WA (US);
Inventor:
Kei Hao, Anaheim, CA (US);
Assignee:
Schweitzer Engineering Laboratories, Inc., Pullman, WA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R 31/08 (2020.01); G01R 19/25 (2006.01); H02H 1/00 (2006.01); H02H 1/04 (2006.01);
U.S. Cl.
CPC ...
G01R 31/085 (2013.01); G01R 19/2513 (2013.01); G01R 31/088 (2013.01); H02H 1/0092 (2013.01); H02H 1/046 (2013.01);
Abstract
Line-mounted devices for determining fault magnitude in an electric power delivery system even under current-transformer (CT) saturation are disclosed herein. Fault magnitude is calculated using unsaturated regions of a current waveform captured by the line-mounted device. The method of determining the unsaturated regions is computationally efficient. Fictitious peaks are removed, and the unsaturated regions are determined based on fractions of the valid peaks. Fault current magnitude is calculated using sample values in the unsaturated regions.