The equivalence of weighted IMF partial discharge signals pulse injection by different coupling modes in GIS

• Published in: 电力工程技术 Vol. 43; no. 4; pp. 95 - 103
• Main Authors: DONG Bingbing, LI Kang, GAO Changsheng, LIU Guanke, DAI Xiliang, XIA Yunfeng
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Electric Power Engineering Technology 01-07-2024
• Subjects: empirical mode decomposition; euclidean distance; intrinsic mode functions (imf); partial discharge simulation; pulse injection; signal equivalence analysis
• ISSN: 2096-3203
• DOI: 10.12158/j.2096-3203.2024.04.010

Pulse injection to simulate partial discharge (PD) is the main method for functional verification of gas insulated switchgear (GIS) ultra high frequency (UHF) PD monitoring device. Due to the different coupling modes of pulse injection in field verification, the equivalence law between simulated PD and actual PD is not clear, and the effectiveness of functional verification of monitoring device cannot be guaranteed. In this paper, a typical PD defect (tip, suspension, insulator bubble) and internal/external pulse injection UHF PD detection platform for 126 kV GIS are established, and the effective pulses of UHF signals are normalized and extracted. Then a signal processing method of weighted intrinsic mode functions (IMF) based on empirical mode decomposition is proposed. The signal equivalence is characterized by calculating the average and maximum values of the Euclidean distance of the signal, and finally compared with the conventional signal deviation method. The research shows that compared with the conv