国内外悬垂绝缘子串风偏设计参数对比与分析

Analysis on Windage Design Parameters of Suspension Insulator String at Home and Abroad

通过比较国内外在悬垂绝缘子串风偏设计中基本风速、风压不均匀系数、风压高度变化系数等参数选取上的区别以及带来的影响,得出以下结论:在基本风速选取方面,国外无论是在风速次时换算时间段还是重现期的取值上均与我国存在较大差异;风压不均匀系数的取值及其折算方法对导线风荷载的影响显著;不同的地面粗糙度类别对风压高度变化系数的取值影响较大,我国的输电线路规范还没有对过渡区地面粗糙度类别的选取进行明确的定义。因此,还需对不同地形特征下不同高度处的风参数进行现场观测,通过积累长期的观测数据,对上述这些设计参数取值进行优化和完善。

Through comparing the differences of parameter selecting in the basic wind speed, the uneven coefficient of wind pressure and the height variation coefficient of wind pressure at home and abroad, some conclusions are drawn in the design of suspension insulator strings. The results show that： in the aspect of basic wind speed choosing, there are great differences either in the wind speed conversion of observation density and time or in the return period between China and overseas countries; the selecting and the conversion method of wind pressure＇s uneven coefficient have significant influence on conductor＇s wind load; the different types of ground roughness have great influence on the values of height variation coefficient of wind presssure, which has not been defined explicitly in the transition area in domestic transmission line standard. So wind parameters should be observed on site for different terrains and heights, and these parameters can be optimized and improved through the accumulation of long-term observation data.