Configuration effect on DC flashover on polluted insulators

DC pollution discharge phenomena and flashover voltages of models made of glass plates, simulating a real insulator of the cap and pin type, were observed and measured. The influence of the main dimensions, such as the distance between sheds, the height of ribs, the width of ditches and the diameter of the disk, on the DC pollution flashover voltages of insulators is investigated and discussed. Some useful results are obtained relating to the prevention of bridging over clearances by local arcs and the improvement of the withstand voltage per unit leakage distance. Based on these results, suggestions for the rational design of DC insulators are presented.<
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