Performance of gas insulated substation under particle contamination with Charge Simulation Method (CSM)

This paper deals with the movement of free conducting particles inside a single phase Gas Insulated Bus duct(GIB).A two dimensional mathematical model was proposed for determining the movement pattern of metallic particle in GIB by considering all the forces acting on the particle like gravitational, drag and the electric field forces. A particle resting on the inner side of the outer enclosure is chosen. The co-efficient of restitution was considered at every impact with the enclosure of GIB. Electric fields at the instantaneous contaminated particle locations were computed using Charge Simulation Method (CSM). To determine the particle trajectory in a single phase Gas Insulated Bus duct (GIB), an enclosure diameter 152 mm and conductor diameter 55 mm is considered. The simulation carried out for various bus configurations with different aluminum, copper and silver wire like particles inside 100KV, 132KV, 145KV and 175KV class enclosure of GIB. The results of the simulation have been presented and analyzed in this paper.