Apparatus for localization of a line fault

Details Apparatus for localization of a line fault Apparatus for localization of a line fault

G - Physics

01

R

324/58.03

G01R 31/08 (2006.01) H02H 7/26 (2006.01)

Patent

CA 1056909

INVENTOR: OTTO LANZ INVENTION: APPARATUS FOR LOCALIZATION OF A LINE FAULT ABSTRACT OF THE DISCLOSURE An apparatus for localization of a line fault wherein at a measuring location on the line there is provided a voltage- and current-measurement circuit, the outputs of which carry a number of voltage-current signal pairs indpendent of one another with respect to the line inductances and line capacitances. A summation circuit having at least two outputs is connected with the measurement circuit through the agency of at least one voltage- and one current signal channel. In the summation circuit there are additively and subtractively superimposed at least one pair of mutually independent voltage- and current signals, if necessary after multiplication of at least one of these signals by a constant factor, into traveling wave signals associated with oppositely moving traveling waves, these traveling wave signals appearing at corresponding outputs of the summation circuit. An integration circuit forms time integrals of the traveling wave signals and an evaluation circuit links or processes at least two traveling wave-time integrals into an evaluation function characterizing the fault direction and/or the fault distance from the measuring location or at least a predetermined reference location on the line. The voltage signal channel encompasses two parallel branches, one of which comprises an oscillating circuit having a natural frequency contained the fault-free line voltage. 1a

254020

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