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This study investigated the influencing mechanisms of shed shape on direct-current pollution flashover voltage and pressure decrease exponent through artificial pollution tests on a glass experimental model in Beijing (50 m altitude) and Tibet (4300 m altitude). Arc development before the flashover was quantitatively recorded using a high-speed camera. Three arc development modes along the pollution surface or in the inter-shed space were then extracted through arc development analysis. The occurrence probabilities of the three arc modes under various shed overhangs, altitudes, and shed spacings were analyzed. Mode probability was used to interpret the decreasing flashover voltage gradient with increasing shed overhang and decreasing shed spacing. Research indicates that pressure decrease exponent rises with shed overhang increase, as explained from the perspective of arc development probability. The quantitative relation between leakage distance efficiency and pressure decrease exponent was theoretically derived, and its validity was proven by comparing the calculated with the measured.

Influence of Shed Shape on Direct-Current Pollution Flashover Voltage and Pressure Decrease Exponent