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. 25, 2003
Filed:
Sep. 28, 2001
Michael Stanimirov, Baden, CH;
Bernhard Deck, Weilheim, DE;
Walter Rueegg, Endingen, CH;
Klaus-Dieter Weltmann, Baden-Dättwil, CH;
Lutz Niemeyer, Birr, CH;
Ralf-Dieter Pietsch, Oberlichtenau, DE;
ABB Research Ltd, Zurich, CH;
Abstract
Current and voltage values (uk, ik) are measured for protection of an electrical power line ( ). An adaptive estimator is used to analyze all the values within a measurement window, and to convert them to impedance values (Z). The line ( ) is switched off if the impedance values (Z) assume unacceptable values. In order to shorten the reaction time, a warning signal (W) is produced if powerful radio-frequency signals are detected on the line ( ). When the warning signal (W) occurs, the respective measurement window is located such that its start matches the time of the warning signal (W), and/or the respective measurement window is shortened.