Electric Field Effect On Particle Trajectory In Three Phase Dielectric Coated Gas Insulated Busduct Using Numerical Methods

Free metallic conducting particles in Gas Insulated Busduct(GIB) may cause loss of as much as 90 % of the gas dielectric strength. Research studies revealed that 20 % of failures in Gas Insulated Substations (GIS) are due to presence of free metallic contaminations in the form of loose particles. Therefore, the presence of free metallic particles in Gas Insulated Busduct(GIB) operating at high electric fields can be a problem. If these particles are eliminated from GIB, then the reliability of compressed Gas Insulated Substation can be improved. The purpose of this paper is to develop techniques for formulating the basic equations that will control the movement of metallic particles in a dielectric coated Gas Insulated Busduct. Analytical and numerical techniques have been used to describe the effect of the ambient electric field on the movement of metallic particle in GIB. The simulation has been carried out to obtain the particle trajectories at various voltages for particles of Aluminum and Copper. The results have been presented and analyzed in this paper