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. 15, 2016
Filed:
Dec. 22, 2014
Schweitzer Engineering Laboratories, Inc., Pullman, WA (US);
Michael J. Thompson, O'Fallon, IL (US);
Dale S. Finney, Little Bras D'or, CA;
Schweitzer Engineering Laboratories, Inc., Pullman, WA (US);
Abstract
The present disclosure is applicable to generators with low motoring power. In one embodiment, a generator protection element may include a generator monitoring subsystem configured to measure a real power output and an imaginary power output of a generator. The system may also include an electrical parameter threshold subsystem configured to determine whether the measured real power output and the measured imaginary power output satisfy a tripping characteristic. The tripping characteristic may be defined by a function having a slope with respect to a real power axis and an imaginary power axis. In some embodiments, the function may be a piecewise function that defines a first linear segment having a first slope and a second linear segment having a second slope. The first slope and the second slope may be equal and opposite. A tripping subsystem may issue a trip command based upon satisfaction of the tripping characteristic.