On Line Partial Discharge Localization in Cable Based on Time Varying Kurtosis and Time Window Energy Ratio

摘要

On the basis of using traveling wave method to carry out location of PD of high voltage cable, the time varying kurtosis method which used in the field of Seismic signal detection is introduced to solve the problem that the positioning accuracy is dependent on the accuracy of time delay estimation. The time window energy ratio method is introduced to solve the problem that the time-varying kurtosis which can not identify the PD pulse is difficult to obtain the first break time on line. Firstly, the time window of the partial discharge is detected by the energy ratio of the time window, and then the local time-varying kurtosis curve is obtained. Finally, based on the time varying kurtosis, the online picking up time is achieved. The simulation results show that this method not only has high precision and strong anti-interference ability, but also can realize that relative error in -4 dB noise environment is 0.23%.