Apparatus for localization of a line fault by using traveling wave signals especially for locating faults both near and far from a measuring location
US4063165A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 27, 1976 |
| Grant date | Dec 13, 1977 |
| Priority date | — |
| Expiry date | May 27, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/265
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
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 independent 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 loc…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.