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. 14, 1976
Otto Lanz, Niederrohrdorf, CH;
Michael Vitins, Zurich, CH;
BBC Brown Boveri & Company Limited, Baden, CH;
Abstract
A method of and apparatus for locating a fault on a line in which there is formed from the voltage and current at a test or measuring location at least one signal (travelling-wave signal) associated with a travelling wave on the line and its variation with time at the test location. There are formed a number of pairs of oppositely moving travelling-wave signals corresponding to the number of phases or conductors of the line and with these travelling-wave signals or signals derived therefrom as integrands there are formed at least two time-integrals each of which is associated with a direction of wave propagation on the line. The time integrals are combined into an evaluation function characterizing the fault direction or fault distance with respect to the test or measuring location, the evaluation function corresponding to a relation prevailing at the fault location between the oppositely moving travelling waves on the line.