高海拔地区变电站外绝缘及空气间隙设计

针对我国实际应用中西藏高海拔地区的外绝缘水平及空气间隙与平原地区不同的问题,为得到高海拔设计经验,通过实地实验获得的图形曲线,提出了将实际环境与理论公式相结合的方法,并结合设计规范中的修正公式得到了修正结论。结果表明:工程应用的爬电比距可通过统一爬电比距和现场污染度的关系经公式修正得到,且可通过计算得出绝缘子片数在工程中的实际用量,还可通过结合实验图形和修正公式得出实际应用的外绝缘水平以及空气间隙。

A New Design of External Insulation and Air Gap Clearance at Ultra-High Altitude

In view of the differences between the external insulation level and air gap clearance in practical application at high altitude areas in Tibet and those in plain areas in China, a new method, which combines the actual environment with theoretical formula, has thus been proposed, based on the graphical curves obtained from field experiments, so as to gain high altitude design experience. Combined with the revised formula in the design specification, the revised conclusion is to be obtained subsequently. The results show that the creep ratio distance in engineering application can be obtained by modifying the formula of the relationship between the creep ratio distance and the field pollution degree; a calculation can be achieved of the actual amount of the number of insulator pieces in engineering; the external insulation level and air gap clearance can be obtained by combining experimental graphics and correction formula.