Abstract
Residual metal particles appear in gas-insulated equipment, which may affect the insulation properties of electrical equipment. In this paper, a specific experimental device is designed to study the discharge characteristics of SF6/N2 mixed gas at different pressures and different mixing ratios under power frequency voltage, and the effect of particle shape, particle material type and gas pressure on the discharge characteristics of SF6/N2 mixed gas. The distortion effect of the shape of the particles and the type of the particulate material on the electric field between the electrodes was simulated. It is found that the breakdown voltage of SF6/N2 mixed gas increases with the increase of gas pressure and SF6 concentration. When the particles are present, the nonlinear effect of metal particles on the breakdown characteristics of SF6/N2 mixed gas in-creases with the increase of gas pressure. Obviously; the more irregular the shape of the particles, the greater the uneven-ness of the corresponding electric field, the greater the breakdown voltage of the SF6/N2 mixed gas; the particulate materi-al also affects the breakdown voltage of the SF6/N2 mixed gas, copper particles and The breakdown voltage of aluminum particles is approximately the same at the same gas pressure, and the influence of iron particles on the breakdown voltage is smaller than that of copper particles and aluminum particles. The research results of the paper have reference value for the study of SF6/N2 mixed gas characteristics and its application in electrical equipment such as GIS.
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