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:
Apr. 26, 2022
Filed:
Aug. 26, 2020
Schweitzer Engineering Laboratories, Inc., Pullman, WA (US);
Matchyaraju Alla, Pullman, WA (US);
Ritwik Chowdhury, Charlotte, NC (US);
Normann Fischer, Colfax, WA (US);
Dale S. Finney, Little Bras D'or, CA;
Rogerio Scharlach, Sandy Springs, GA (US);
Schweitzer Engineering Laboratories, Inc., Pullman, WA (US);
Abstract
Detection and protection against electric power generator rotor turn-to-turn faults, rotor multi-point-to-ground faults, and rotor permanent magnet faults is provided herein. A fractional harmonic signal is used to determine the rotor fault condition. The fractional harmonic signal may be a fractional harmonic magnitude of the circulating current of one phase. The fractional harmonic may be a fractional harmonic magnitude of a neutral voltage. A tripping subsystem may issue a trip command based upon detection of a rotor turn-to-turn fault condition.