Traveling Wave Location of Cable Faults Based on Real-time Sensing of High Frequency Signals

In order to improve the accuracy of cable fault location, this paper proposes the principle of traveling wave fault location based on high-frequency signal real-time sensing. Use ATP-EMTP to build a cable line model, monitor fault high-frequency signals through high-frequency sensors at both ends of the line, and use wavelet transform to perform singularity detection and data analysis in Matlab. In order to reduce the effects of attenuation and dispersion in the process of traveling wave transmission, this paper proposes the concept of correction wave. First carry out a rough distance measurement of the fault, then correct the wave speed and the time for the traveling wave head to reach both ends of the line, and finally achieve precise positioning through a second distance measurement after correction. Research shows that this method can calculate the wave speed online in real time, and is not affected by the location of the fault, the fault type and the transition resistance. What's more, it improves the reliability of the positioning results.