Characteristic Analysis of Partial Discharge Parameters in Air Insulation Using High Frequency Current Transformer

This paper aims to detect partial discharge (PD) in air insulation using HFCT and acoustic camera (Fluke ii910) under varying voltages, comparing setups with and without room temperature conditioning. PD signals, processed into PD pattern plots, exhibit asymmetry, with positive peaks centered at phases 45°–135° and negative peaks at 225°–315°. The analysis reveals an increased PD count, an expanded phase angle range, and an amplified signal amplitude with voltage rise. Acoustic camera data mirrors HFCT results, confirming corona PD traits. This study sheds light on corona discharge PD in air insulation, laying the groundwork for further research.