An On-Line Arc Discharge Location Method Based on Wave Velocity Correction

Aiming at the issue that traditional traveling wave methods do not consider the frequency fluctuations and attenuation of arc discharge and instead rely on preset empirical wave velocities for fault location, this paper proposes an online fault location method based on self-determined and self-corrected wave velocities. The basic problems of the cable transmission line theory are reviewed first, while developing the fault location method by using the dual-ended travelling wave technique. Then, it proposes wave velocity correction and calibration methods that consider the central frequency and its deviation during signal transmission. A simulation is designed to validate the method, considering the effects of noise and damage level on location accuracy. The simulation results indicate that the calculated fault location is 1527.40 m, with a relative error of 0.548%. Moreover, the impact of noise and the extent of damage on the localization outcome is minimal. Fault location experiments were carried out on a 105 m cable, resulting in a fault error of 2.16%, which also confirms the accuracy and effectiveness of the method.