method and apparatus for locating a fault in a power transmission scheme and power transmission scheme

摘要

The invention relates to a method for locating a fault in a power transmission scheme including a plurality of power transmission sections and a plurality of connection points, the connection points including first and second end connection points. and at least one intermediate connection point, and each power transmission section is arranged to interconnect two respective connection points so that the transmission sections are successively connected between the first and second end connection points and so that the or each intermediate connection point interconnect to one or a pair close to the transmission sections. The method comprises the steps of: - measuring the first and second voltage phasors at the first and second final connection points, respectively; obtaining a first set of phasors, wherein the first set includes the first measure of the final phasor and further includes the respective phasors at each of the second intermediate connection points which are determined on the basis of the first measure of the final voltage phasor; obtaining a second set of voltage phasors, wherein the second set includes the second final voltage phasor measurement and further includes the respective voltage phasors at each of the first intermediate connection points which are determined based on the second phasor measurement. final tension; - comparing the first and second sets to identify the power transmission section or connection point corresponding to the fault location, where each first phase voltage phasor is compared to the respective second set voltage phasor corresponding to the same point. of connection.