Abstract
Due to the adsorption effect of DC electric field on pollution particles, the pollution accumulation of DC arrester is more serious than that of AC arrester. In addition, the UHV DC polar bus arrester also has a parallel resistance pole inside, the external electric field and the internal radial electric field will be affected by the pollution distribution. In this paper, the electric field simulation model of UHV DC polar bus arrester under the condition of pollution was established, which was used to calculate and analyze the electric field on the surface of the insulating coat and the radial electric field between the resistance pole and the insulating coat when the overall pollution and the local dry belt of the arrester occur. The results showed that the overall pollution of the arrester would lead to the increase of the surface field strength and the internal radial field strength. While the value was small, it would not cause corona and flashover. When the partial dry belt occurred, it would form the partial high surface field strength and radial field strength on the surface of skirt and the air gap between the resistance piece and the insulating coat, which would cause flashover on the surface of the insulating jacket, corona discharge and penetration discharge between the resistance piece column and the insulating coat.
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