Interference Rejection of High Voltage Cables Partial Discharge Detection Based on Combination Features Analysis

Partial discharge (PD) features analysis and effective PD features selection play an important role in interference signal rejection and PD identification of High Voltage (HV) cables. In the paper, combination PD features analysis of HV cables is presented, in terms of visualization performance of these features, in order to select several effective PD features for interference signal rejection. Firstly, the five types of artificial defect of HV cable and the testing system of PD signals were introduced. The PD testing experiment was carried out. Secondly, based on the raw data obtained from the experiment, the PD signals and interference signals were extracted. Then the feature extraction was carried out, including one-dimensional feature extraction, two-dimensional and three-dimensional feature construction. Finally, the visualization analysis, including one-dimensional feature visualization, two-dimensional feature visualization and three-dimensional feature visualization, was applied to evaluate the combination PD features. Results show that the effective PD features for interference rejection of PD detection are the features related to wavelet features and features which can represent the rise time and fall time of PD pulses.