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. 25, 2019
Filed:
Aug. 21, 2018
Applicant:
Schweitzer Engineering Laboratories, Inc., Pullman, WA (US);
Inventors:
Ritwik Chowdhury, Toronto, CA;
Dale S. Finney, Little Bras D'or, CA;
Assignee:
Schweitzer Engineering Laboratories, Inc., Pullman, WA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H02H 7/06 (2006.01); H02H 1/00 (2006.01); G01R 31/02 (2006.01); G01R 31/34 (2006.01);
U.S. Cl.
CPC ...
H02H 7/06 (2013.01); G01R 31/025 (2013.01); G01R 31/346 (2013.01); H02H 1/0007 (2013.01);
Abstract
Detection and protection against electric power generator stator ground fault conditions in multiple-generator high-impedance grounded installations is provided herein. In one embodiment, a generator protection element may block a determination of a fault using third harmonic voltages when the third harmonic voltage from the generator is less than a factor of the maximum third harmonic voltage from all of the generators on the common bus. A tripping subsystem may issue a trip command based upon detection of a stator ground fault condition.