Double-Ended Localization Method Based on Joint VMD and WVD Time–Frequency Analysis

The double-end traveling wave method has been increasingly applied and studied for locating cable defects in operation, but the problem of difficulty in accurately matching and synchronizing the pulse signals in long cables has an impact on the accuracy as well as the accuracy of locating cable defects. This paper proposes an improved double-end traveling wave fault location method based on the joint variational mode decomposition (VMD) and wigner-ville distribution (WVD) time–frequency analysis. By installing sensors at both ends of the cable to collect the partial discharge signals, the phase spectra of the first and last partial discharge pulses are obtained and the phase of the wave head moment and amplitude moment are extracted through the joint analysis of VMD and WVD, and the improved double-end traveling wave fault location method is used to The improved double-ended traveling wave fault location method was used to locate the partial discharge defects in the cable. The improved double-ended travelling wave fault location method uses phase instead of wave speed to avoid the difficulties of matching incoming and reflected signals and the over-dependence on data synchronisation and the accuracy of line parameters. Simulations using PSCAD software for cable lines with a double-ended configuration show that the improved method has higher localisation accuracy and is better than the traditional double-ended traveling wave method for any fault point location.