Influence of Surface Charge on Distribution Characteristics of Metal Particle Dust in DC GIS/GIL

We mainly study the influence of surface charge on the movement and distribution characteristics of metal particle dust (MPD) in dc gas insulated switchgears/lines (GIS/GIL). Based on the improved boundary element algorithm (BEM), we establish the movement model of MPD. Combined with experiments, we obtained the distribution characteristics of MPD. The research results show that under negative voltage, the metal particle contamination is more serious at the convex side of the spacer. Homopolar surface charge enhances the adhesion of MPD near the spacer, but it also enhances the repulsion between the spacer and MPD in the chamber. Heteropolar surface charge weakens the adhesion of MPD near the spacer, but it also weakens the repulsion between the spacer and MPD in the chamber. Therefore, we suggest that surface regulation should be adopted to make the spacer surface accumulate homopolar surface charge. Meanwhile, particle traps should be installed near the spacer and in the middle of the chamber to achieve more comprehensive metal particle suppression.