Single-ended Traveling Wave Surge Identification and Fault Location for Transmission Lines Based on the Sensitive Angle Characteristic of Waveshape With Multiple Wavefronts
It is difficult to identify the second wavefront reliably and effectively during the single-ended traveling waves fault locating process for transmission lines.In order to solve these problems,a single-ended traveling wave identification and fault location approach based on the sensitive angle characteristic of waveshape is proposed in this paper.First,the regularity of fault induced traveling waves process on transmission lines is analyzed.The sensitive angle and non-axisymmetric characteristics of the wavefront in local waveshape view is found.Then,the algorithm of identifying the initial traveling wave and multiple homopolar traveling waves observed at single terminal is proposed by using Radon transform variable angle projection to detect the most sensitive angle and identify the non-axisymmetry on the both sides of the most sensitive angle.Finally,multiple fault locating formulas are constructed based on multiple homopolar traveling waves'arrival time difference.The final reasonable result is confirmed.The proposed algorithm transforms the wavefront identification from traditional time-domain series analysis into detection of the most sensitive change direction and the symmetry of geometry in the spatial domain of waveform graph,with high anti-interference capability,which greatly improves the reliability of the surge detection and the identification ability of subsequent traveling waves.And the redundancy of single-ended traveling wave fault location formula is also enhanced.Extensive field data recordings and digital simulation tests show that the proposed algorithm is effective,reliable,and intuitive,with wide range of applications.This paper provides new ideas for single-ended traveling wave fault location and its extended applications.
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