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Partial discharges (PDs) initiated by conductive particles attached to the insulator surface in gas-insulated metal-enclosed switchgear (GIS) may occur at different particle tips with varying spatial information. PD modes also differ depending on the spatial position and voltage phase. In this study, PDs were investigated as per phase-space joint resolved characteristics using two photomultiplier tubes and phase-resolved discharge images. PDs were observed to occur mainly at the negative particle tip regardless of the half-cycle. A sudden increase in apparent PD charge is attributed to the corona-creepage transition. The PD mode transition mechanism and effectiveness of the on-site dielectric test for defect detection were also determined. The results presented here may provide theoretical support for GIS defect identification and threat assessment.
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Wu et al. (2020) studied this question.
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