Dielectric strength and insulating property on surface of spacer for particle contamination under dry air gas

Sulfur hexafluoride is the most commonly used insulation gas in electrical systems. Gas insulated systems are widely used in the electric power industry for transmission and distribution of electrical energy. When SF6 was first discovered, the potential application was only considered for insulation because of good dielectric properties. But the widespread use of SF6 gas by electric power and other industries has led to increased concentrations of SF6 gas in the atmosphere. This causes concern as to possible effects on global warming because SF6 is a potent greenhouse gas. Due to this reason, first we studied uniform and non-uniform field property by dry air gas. This paper presents the dielectric strength and insulating property on the surface of spacer for particle contamination under dry air. We performed tests for the length and shape of particle. Test gas pressure is from 0.2 to 0.7 MPa. Particle position on surface of spacer is divided into nine parts and review. The results of analysis on the central conductor 31mm concave point has been identified as critical point. We anticipated that the breakdown voltage through analysis and testing were conducted. To find the 50% Breakdown voltage, the number of breakdown was performed 10 times and all test results were applied to analyze the normal distribution. The study was conducted to develop environment-friendly insulating material for GIS that can reduce SF6 gas and make a design Criteria for dry.