Effect of various design parameters of gas insulated bus duct in the performance of gas insulated sub-stations

Donducting particles in transmission and switching equipment insulated by compressed sulphur hexafluoride (SF6) can result in loss of as much as 90% of the gas dielectric strength. Under an applied electric field these conducting particles acquires a charge and lifts off from its resting position on the conductor when the electric force from the field becomes equal to the gravity force. Particle movement plays a crucial role in determining the insulation behavior of GIS/GITL systems. In this paper a Single Phase of Gas Insulated Bus duct with inner and outer diameter to 40mm and 137mm is considered for analysis and compared with a single phase enclosure with outer diameter as 152mm and inner conductor diameter of 55mm with aluminum, copper and silver particles of size 10mm in length and 0.25 as radius present on the enclosure. The results have been compared on the extent of particle movement for the same condition of the gas and particle geometry. The simulation results have been presented and analyzed.