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:
Aug. 23, 2005
Filed:
Feb. 19, 2003
Heiko Fasshauer, Hessisch-Lichtenau, DE;
Michael Viotto, Kassel, DE;
Heiko Fasshauer, Hessisch-Lichtenau, DE;
Michael Viotto, Kassel, DE;
Abstract
The invention relates to a method and an apparatus for measuring the impedance of an energy supply system at a rated frequency by impressing a testing current () into the system and measuring () the resulting changes in a system current and a system voltage. According to the invention, the system current and the system voltage are measured during a first preselected time interval (T) without impressing of the testing current and are measured during a second preselected time interval (T) with the impressing of the testing current. The testing current is composed of at least one periodic signal with at least one testing frequency (f, f) that deviates from the rated frequency. Based on the measured system currents and system voltages, a Fourier analysis is used to determine a resulting impedance for the testing frequency (f, f). The impedance of the energy supply system at the rated frequency is derived from the impedance obtained for the testing frequency (f, f) (FIG.).