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:
Dec. 03, 2013
Filed:
Apr. 13, 2010
Hans Björklund, Ludvika, SE;
Hans Björklund, Ludvika, SE;
ABB Technology AG, Zurich, CH;
Abstract
A method and apparatus for determining the time of arrival of a fault wave at a measurement point of a power transmission system includes a measurement unit measuring a power quantity of the system at the measurement point (P) for obtaining a measurement quantity being a potential fault wave, a time keeping unit, a storage unit storing the measurement quantity, a comparing unit comparing the measurement quantity with a threshold (T) for detecting the presence of a fault wave (W) and an analyzing unit. The analyzing unit analyzes measurements made before the fault wave presence was detected, determines the starting point (SP) of the fault wave based on the analysis and sets the time of the starting point to be the fault wave arrival time (T).