Gas Mixtures Insulation Properties Measurements Practical Significance For Switches With Gas Insulators

This paper presents considerations on the synergistic effects in gas mixtures; the SF6-N2 and SF6-Ar, in respect to relevant characteristics of gas insulation. In the experiments we tested following gas properties: dielectric strength, voltage breakdown rate of rise, surface breakdown per insulator within a gas atmosphere. In the experiments we applied: DC and pulse shaped (both polarities), AC and several combinations of DC and pulse shaped voltages. The reversibility of dielectric properties was determined using high current breakdown between two successive measurements. The results obtained were treated statistically by applying theoretical statistic distributions and the U-test to determine the reversibility of dielectric magnitudes. Results shown in this paper have practical significance in obtaining voltage shapes of high speed and manipulation with switching elements based on gas insulators under pressure.