This paper presents the artificial pollution test results for porcelain insulator, glass insulator and composite insulator with different profiles in natural high altitude areas. The experimental results show that insulator profiles play an important role in the flashover performance since the dc arcs levitate more easily from the insulator surfaces at high altitudes than at sea level. For porcelain insulators, the flashover performances of the belltype insulators are better than tri-shed insulators. The arcs propagated on the type D glass insulator because that the unit spacing of the type D glass insulator is higher than the type E insulator, so the flashover voltage for the former is higher than the latter. It was found that, for composite insulator, with the same insulation distance, the flashover voltage had a maximum at a particular value of the radial extent of the shed and of the between-repeat distance, and that the influence of these two factors on the flashover voltage was independent of each other.
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