The double-umbrella insulator has the advantages of improving the pollution-resistance performance of the insulator and increasing the creepage distance.
这种双伞绝缘子的优点是改善绝缘子的耐污秽性能，增加爬电距离。
A new viewpoint on the selection of the specific creepage distance is put forward and the merits and disadvantages of the line lightning arrester are analyzed.
作者还对避雷器爬电比距的选择提出新的观点，分析了线路避雷器具备的优缺点。
The total creepage distance of an insulator shall be not less creepage distance requested by the pollution level for the site.
绝缘子总的爬距应等于或大于由该地区污秽等级所要求的爬距。
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