A Study on Characteristics of Insulation Breakdown and Surface Discharge by the Oxygen Concentration in the Dry Air in Quasi-Uniform Field

This study was conducted to discover a substitute of SF6 gas. SF6 gas is widely used across the industries. Thanks to superior electrical properties, in particular, it has been commonly used in electrical industry. However, there have been a lot of studies on its serious effect on global warming. As a substitute of this synthetic gas, a mixture of dry air and N???/O??? was chosen in this study. In case of N???/O???, dielectric strength differs depending on the mixing ratio. This study examined dielectric breakdown and flashover after adjusting oxygen percentage in the dry air. This test was conducted in a quasi-uniform electric field depending on pressure, oxygen concentration and gas mixtures. The test results found that dielectric voltage and flashover voltage were the highest at a certain oxygen concentration. It is the results of this photoionization and electron attachment of oxygen