Traveling Wave Fault Location Method Analysis and Prospect

Chinese high-voltage and ultra-high-voltage AC and DC transmission projects are increasing, reflecting the characteristics of long transmission lines and high failure rates. The performance of relay protection technology is related to the safety of DC transmission systems and the speed of fault recovery. Due to the long transmission line, it is hoped that the position of the fault point can be determined by accurate ranging to facilitate field observation and recovery. The traveling wave fault location method has the characteristics of high ranging accuracy and fast positioning speed, and is currently mainly used in high voltage transmission lines. Firstly, the traveling wave fault location algorithm and its research status are discussed comprehensively. According to the principle of traveling wave fault location algorithm, it is divided into one-terminal method, multi-terminal method based on single transmission line and network measurement based on wide-area traveling wave information. On this basis, the key problems existing in traveling wave fault location method are summarized, and further research directions are discussed.