Influence of Free Metallic Particle Dimensions on Its Movement in Three Phase Common Enclosure Gas Insulated Busduct(GIB) Using Charge Simulation Method

In this paper, the trajectories of free conducting particles of various sizes inside a three phase common enclosure Gas Insulated Busduct(GIB) are simulated by solving the nonlinear second order differential equation of particle motion iteratively by using RK 4 Order Method. Compressed Gas Insulated Substations(GIS) consists of a conductor supported by spacers inside of Sulphur hexafluoride gas(SF6) filled enclosure. The metallic particle contaminations in the form of loose particles adversely affect the insulation integrity and can cause failures of Gas Insulated Substations. The presence of contamination can therefore be a problem with Gas Insulated Substations operating at high electric fields. In order to determine the random movement of metallic particles, the calculation of movement in axial and radial directions was done at every time step. The simulation considers the electric field effect and various particle dimensions on the particle movement. The electric fields at the instantaneous particle locations are determined by using Charge Simulation Method(CSM). Typical results for aluminum and copper wire particle with different dimensions are described and the movements of metallic particle with charge simulation method of field calculation are compared with Analytical Method of field calculation. From the results it is observed that the particle maximum movements with analytical method of field calculation is more than charge simulation method of field calculation. Also noted that the maximum movements of metallic particles decrease with increase of particle length and radius. The results have been presented and analyzed in this paper.