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. 13, 1977
Filed:
Apr. 16, 1976
Otto Lanz, Niederrohrdorf, CH;
Michael Vitins, Zurich, CH;
BBC Brown Boveri & Company Limited, Baden, CH;
Abstract
A process and apparatus for locating faults on a line, wherein at least one signal (travelling-wave signal) associated with a progression thereof at the measuring location is formed from the voltage and current at a measuring location. There are formed travelling-wave signals corresponding in number to the phases or conductors in the line and decoupled from one another in relation to the line inductances and line capacitances. At least two time-integrals are formed with these travelling-wave signals or signals derived therefrom as integrands, each time integral being associated with one direction of wave-propagation on the line. These time-integrals are processed by an evaluating function which characterizes by way of its sign and magnitude the direction and distance of the fault from a predetermined reference location on the line, which function corresponds to a relationship prevailing at the fault location between the travelling waves proceeding in opposite directions on the line.