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. 10, 2001
Filed:
Aug. 11, 1998
Wilsun Xu, Edmonton, CA;
The Governor of the University of Alberta, Edmonton, CA;
Abstract
A method and apparatus provides a technique for measuring characteristics of a harmonic pollution source connected to an alternating current power distribution system. The apparatus has a harmonic current meter and a harmonic voltage meter. Also, the apparatus has a harmonic perturbation device which can produce changes in the harmonic energy present in the power distribution system. The perturbation device can be a harmonic shunt or a harmonic frequency generator. In operation, harmonic voltage and current measurements are made at the connection point between the harmonic pollution source and the rest of the power distribution system. One set of voltage and current measurements is made with the harmonic perturbation device connected and one set of measurements is made with the harmonic perturbation device disconnected. The measurements are performed at the frequencies of interest. The two sets of measurements provide enough information to solve a set of equations which reveal characteristics of the harmonic pollution source. For example, the harmonic current magnitude and impedance of the harmonic pollution source can be found.