Comparison of Movement behavior of Wire and Spherical Particles applying AC and DC Voltage

Abstract

In the SF6 Gas Insulated Switchgear (GIS), metallic particles of various shapes generated during normal operation and manufacturing processes are levitated and moved under the influence of an electric field. The levitated metallic particles affect the high-voltage conductor and cause serious dielectric problems such as partial discharge and dielectric breakdown. This problem can be solved by applying a resistive coating inside the GIS that suppresses the levitation of metallic particles. However, in the case of resistive coatings, the unit cost is high, so when applied entirely inside the GIS, a considerable cost is incurred. For this reason, considering economic feasibility, an efficient application area is required, and the behavioral characteristics of metallic particles should be analyzed. In this paper, when AC and DC voltages are applied to a parallel plate, the motion characteristics of the shape and number of metallic particles and the lift-off voltage are tested. As a result, it was confirmed that the lift-off voltage decreased when the number of metallic particles increased in AC and DC voltage, and both the maximum bounce height and the first behavior width of particles increased.