Fault Location of Hybrid Transmission Lines Based on k-means Algorithm

Abstract

Difficulties in the measurement of cable hybrid transmission lines are mainly due to the large differences in the structure and characteristics of cables and overhead lines. The wave speed and wave impedance of the two are different. When the fault traveling wave propagates to the connection point of the two, a strong wave deflection phenomenon will occur, which causes the traditional traveling wave ranging error to increase, and various single-ended traveling wave fault location algorithms cannot be directly applied to the overhead line-Cable hybrid line. Based on the multi-scale wavelet decomposition of signals and combined with the clustering analysis method, a new fault location method based on K-means algorithm is proposed. For a high-voltage cable hybrid transmission line, a simulation model is established. The single-ended distance measurement method is used to simulate the experiment with different transition resistances. The ATP-EMTP simulation results show that the method improves the transmission. The accuracy and reliability of line fault location can provide reference for fault location of transmission lines.