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:
Jul. 22, 2003
Filed:
Feb. 26, 2002
Myongji University, Seoul, KR;
Abstract
A method for measuring the fundamental frequency component of a fault current or voltage, including measuring a fault current or voltage signal, which includes a DC-offset, a characteristic frequency component, a fundamental frequency component, and harmonics, with a predetermined sampling period, filtering the fault current or voltage signal to remove the harmonics, removing the fundamental frequency component from the filtered fault current or voltage signal, calculating the DC-offset and the characteristic frequency component with the fault current fault current or voltage signal wherein the fundamental frequency component is removed, and determining the fundamental frequency component by subtracting the calculated DC-offset and the characteristic frequency component from the filtered fault current or voltage signal.