Influence of Spacer on the Movement Law of Free Metal Particles in GIS

When GIS during manufacturing, transportation, installation, and operation, metal particles will inevitably be generated due to mechanical friction. The existence of metal particles poses a huge threat to the insulation performance of GIS. The previous research on free metal particles in GIS mainly focused on the force analysis of the two-dimensional radial plane particle movement, ignoring the influence of the spacer on the axial movement of the particles. In this paper, by establishing a three-dimensional simulation model with spacers, the influence of spacers on particle axial electric field distribution is studied. Based on the analysis of the force of two-dimensional radial plane particles, the influence of axial electric field on particle movement is further studied. The results show that the direction of the electric field on the concave side of the spacer is directed from the spacer to one end of the pipeline, and the particles are subjected to the axial electric field force directed to the spacer. The particles are finally mainly concentrated near the spacer. The actual GIS experiment platform was taken to verify the simulation calculation results.