Abstract
The research on pollution flashover characteristics of insulators under low air pressure is of great engineering application value and scientific significance for carrying out altitude correction research and formulating relevant standards in the field of external insulation of power transmission and Transformation Engineering in ultra-high altitude areas. It provides an important reference for the construction of power transmission projects and railway project in high altitude areas. AC pollution flashover tests of QBG-25/16 and QBG-25/20 insulators at high altitude and low air pressure were carried out in a large-scale multi-function artificial climate chamber. The results show that when the altitude is 1000m~5500m and the salt density is 0.1~0.15mg/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , the pollution flashover voltage of insulators decreases with the decrease of air pressure, and the pollution flashover voltage of insulators decreases with the increase of salt density; the flashover voltage of insulators with different insulator structures is affected differently by air pressure; the characteristic index n of air pressure decreases with the increase of pollution degree, and the characteristic index n of air pressure also decreases Affected by insulator type.
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