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Keywords

transmission line, information fusion, fault location, single end, waveform similarity

Abstract

The traditional fault location method based on transient value only utilizes local fault feature information and it has a poor adaptability to different fault conditions. Therefore, the time-frequency characteristics of transient voltage are analyzed at first. The similarity and difference of transient feature generated by different fault positions are considered and five fault features are involved in total. In time domain, the arrival time difference, amplitude, and polarity of each transient signal are extracted. In frequency domain, the energy ratio of low frequency to high frequency and the wave velocity of the main frequency components of each transient surge are selected. On this basis, a fault transient information fusion matrix is constructed according to the extracted fault features. Finally, the difference of different fault transient information matrix is analyzed quantitatively by utilizing a waveform correlation coefficient, and a novel single-ended fault location method based on fault transient information fusion is proposed and it can be adapted to different fault conditions since it has a simple principle and low requirement for sampling frequency. The simulation verifies reliability and practical value of this method.

DOI

10.19781/j.issn.1673-9140.2022.02.008

First Page

62

Last Page

71

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