Abstract
In recent years, the surface discharge of polluted post insulators in rain which affects HVDC transmission has brought great influence to the national economy and people’s daily life. In order to improve the strength of the external insulation of HVDC converter stations, this paper mainly focus on the environmental characteristics and areal rainfall of UHV power stations, analyzes the influence of experimental factors (sample treatment mode, rain-drenching mode, pressurization mode and insulation material) on the discharge behavior of post insulators in rain flash experiment, summarizes the relevant standards in the rain flash experiment of large-scals post insulators. The results showed that the effects of different contamination methods on rain flashover are not different, among which spraying method can improve the experimental efficiency, and the quantitative brushing method can reach the specified ash density and salt density more easily; The number and length of water column of composite insulators are lower than that of porcelain insulators, and the number of water droplets between large sheds and the number of water droplets on the edge of large sheds are higher than that of porcelain insulators.
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