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:
Mar. 10, 2009
Filed:
Nov. 02, 2005
Roy E. Moxley, Colfax, WA (US);
Roy E. Moxley, Colfax, WA (US);
Schweitzer Engineering Laboratories, Inc., Pullman, WA (US);
Abstract
Provided is a system and method for detecting a power system condition of a power system. The system includes at least a first and second intelligent electronic device (IED) operatively coupled to the power system at respective first and second power system locations. Each IED is configured to calculate a measured time value based on a frequency dependant parameter such as a secondary voltage signal at their respective locations, to compare the measured time value to a reference time value to form a time error, and to transmit the time error. The system further includes a third IED configured to compare respective time errors received from the first and second IEDs to form a time differential error, to map the time differential error back to their power system locations, and compare the time differential error to a predetermined threshold to determine the power system condition.