Electrostatic behavior of conductive particles on conductive and dielectric surfaces in gas-insulated substation environments

This study investigates the electrostatic behavior of conductive particles subjected to high-voltage, non-uniform electric fields in gas-insulated substation (GIS) environments. A simulation model was developed to evaluate the dynamics of particles placed either directly on a grounded electrode or atop a dielectric surface composed of KAPTON and PDMS. The results reveal distinct differences in particle behavior depending on surface conductivity. Particles on conductive surfaces exhibited Coulomb-driven lift-off and charge reversal, while those on dielectric surfaces displayed lateral migration influenced by dielectrophoretic and frictional forces. The findings underscore the significant role of electrode geometry, surface material properties, and electric field gradients in shaping particle motion. These insights have important implications for the design of GIS insulation systems, particularly in mitigating the risks of partial discharges and insulation breakdown caused by mobile conductive contaminants.