Double-circuit on same tower double-circuit line fault distance measurement method

Abstract

The invention discloses a double-circuit on the same tower double-circuit line fault distance measurement method which includes the following steps: (S1) using double-circuit three-phase transient currents which are obtained by sampling as original current signals for denoising; (S2) conducting six-phase phase-mode transformation to denoised current processing signals and extracting one mode of components to be used as fault analysis signals; (S3) conducting matching pursuit to the fault analysis signals which are obtained by applying a matching pursuit algorithm by using pulse signal atoms, comparing peak time of three optimum matching pulse atom signals with the largest energy, and taking the time which reaches a peak value at the earliest to be used as the time when a traveling-wave head reaches a measurement point; and (4) calculating and obtaining the distances respectively from measurement points at two ends and a fault point according to the obtained time during which the traveling-wave head can reach the measurement points at the two ends. By means of the double-circuit on the same tower double-circuit line fault distance measurement method, the characteristics of the traveling-wave head can be extracted accurately and reliably, and precision and reliability are achieved in the double-circuit on the same tower double-circuit line fault distance measurement.

Description

technical field [0001] The invention relates to a fault distance measurement method for distribution network transmission lines, in particular to a fault distance measurement method applied to double-circuit lines paralleled on the same pole. Background technique [0002] When a fault occurs on a transmission line, it is of great significance to quickly and accurately determine the fault location, eliminate the fault, and restore power supply in time to improve the reliability of power supply. With the development of the power system, parallel double-circuit lines on the same pole have been widely used in high-voltage and ultra-high-voltage transmission lines in Europe, America, Japan and other countries due to their features of saving land, small investment, and high economic benefits. [0003] With the widespread adoption of parallel double-circuit lines on the same pole, the research on fault location of this transmission structure becomes increasingly important. At pres...

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Problems solved by technology

[0006] However, the accuracy of traveling wave fault location mainly depends on whether the extraction of traveling wave head is reliable. The current method for extracting traveling wave features is not mature enough, which makes traveling wave length The accuracy and reliability of ranging can not be well guaranteed

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