Practical Results for Breakdown Voltage around Single and Multi-Contaminating Particles with Disc and Conical Spacers under D.C Voltage

For gas-insulated transmission lines (GITL) and gas-insulated substations (GIS) systems, the most important dielectric design factor has been the conjunction of metallic particle contamination with spacers. The breakdown voltage tests in this work are conducted in a test chamber that is 12 cm wide and 50 cm long and can sustain pressures of up to 5 bars. The electrode system is installed in a chamber at room temperature that is either packaged with air or Sulfur hexafluoride (SF6) gas. The electrode setup adopted in this test comprises two parallel plane electrodes joined by an Epoxy Resin spacer inside the test tank. Spacers are made using the epoxy resin substance. Bisphenol-A and an anhydride hardener are the two ingredients of epoxy resin. In this study, we prepare various amounts of Bisphenol and hardener, which are then combined to form an epoxy resin material. The ideal concentration of these substances is then selected to create different spacer shapes, such as conical and disc spacers. Breakdown voltage values are examined in relation to single and multiple contaminants, such as wire and spherical particles. Additionally examined is the impact of various spacer shapes, including disc and conical spacers, as well as the existence of different contaminating particles, on the breakdown voltage values that are observed. The calculated and measured breakdown voltage values are compared.