Akademik Veri Yönetim Sistemi
11 th International Conference on Computational and Eperimental Science and Engineering (ICCESEN-2024) , Antalya, Türkiye, 25 - 28 Ekim 2024, ss.23-28, (Tam Metin Bildiri)
In the present study, an experimental laboratory setup was devised utilizing needle and hemispherical electrodes. Two distinct types of needle electrodes were employed: copper needle electrodes and steel needle electrodes equipped with medical tips. Hemispherical electrodes were fabricated in three different sizes, specifically 2 cm, 5 cm, and 6 cm in diameter. A non-uniform electric field was generated between the needle and hemispherical electrodes, and leakage current signals were captured over the ground electrode. Experiments were conducted under varying high voltage levels of 5.4, 7.2, 9, and 10.8 kV. The collected leakage current signals were subsequently processed using advanced signal decomposition techniques, including Empirical Mode Decomposition (EMD), Variational Mode Decomposition (VMD), Ensemble Empirical Mode Decomposition (EEMD), and Multivariate Variational Mode Decomposition (MVMD). Through the application of the EMD method, partial discharge phenomena within the leakage current signal were effectively isolated. Each decomposition technique dissects the signal in unique manners, providing distinct benefits and drawbacks. These methodologies aim to decompose the signal into its intrinsic mode functions, thereby enabling the capture of both high and low-frequency components, and discerning the inherent differences among them. These sophisticated techniques are envisaged as critical tools in elucidating the temporal, amplitude, and frequency characteristics of partial discharge signals, thereby enhancing the detection and analysis of faults and insulation failures by thoroughly examining the behavior of partial discharges.