Research on Multi-path Traveling Wave Algorithm for Lightning Fault Location of All-parallel AT Traction Power Supply System
A multi-path traveling wave fault location method was proposed to address the problems of complex traveling wave propagation paths caused by AT transformers and parallel structures,difficulty in effectively identifying the nature of traveling wave front,and wave speed instability caused by the phenomenon of traveling wave dispersion and line fre-quency variation parameter characteristics.Based on the differences between the bidirectional lines in current wave prop-agation,the method used current similarity to identify fault sections.The influence of the all-parallel AT traction network structure on the traveling wave propagation characteristics was explored and the current and voltage traveling wave propa-gation paths were calibrated.Finally,based on the polarity analysis of the multi-path current and voltage traveling waves,the multi-path traveling waves for fault ranging were selected to derive the ranging equations for eliminating the wave speed.The simulations show that the proposed ranging method can identify the nature of wave front effectively,and the calculated fault distance,which is basically independent of the wave speed,is not affected by the length and struc-ture of the traction network section.
lightning faultmulti-path traveling waveall-parallel AT traction power systemtraveling wave polarityfault location
万方数据
维普
