典型微地形下的风速特性及其在输配电线路杆塔设计中的应用

doi:10.11930.2015.7.146

摘要/Abstract

摘要： 中国荷载规范对不同地形下的风速取值进行了规定。尽管如此，由于实际地形千差万别，特别是在微地形、微气象环境下，采用的设计值与实际值有时差别较大，造成倒塔断线情况时有发生。针对山丘、悬崖和垭口3种微地形，从杆塔设计的角度出发对微地形环境下的风场特性进行了仿真分析。推导出了典型微地形环境下的杆塔风速修正系数计算公式，并给出了适用条件。最后通过两基塔线模型验证了大风作用时不同微地形种类对输配电线路的影响。计算结果表明，给出的计算公式更适用于架空输配电线路的设计或验算。为位于垭口地形中的线路的精细计算提供了参考。

关键词: 微地形, 风荷载, 杆塔, 输配电线路

Abstract: Provisions are given on the calculation of wind speed over complex terrain in the load code of China. However, the actual micro-terrian varies significantly from place to place and a big difference appears sometimes between the actual wind speed and the design value, which leads to the broken of overhead transmission and distribution lines and towers from time to time. Thus, it is necessary to investigate the design method of the transmission line under micro-terrian conditions. A simulation analysis is conducted on airflow characters in different micro-terrian settings, namely hills, cliffs and saddle backs. A formula is deduced for calculating the wind speed correction coefficient under typical micro-terrain settings and its application conditions are also provided. Finally, a model of two-tower and a line is established to testify the influences of different micro-terrains on the overhead transmission lines under gale wind. The result shows that the obtained formula is applicable for the overhead transmission line design and checking.

Key words: micro-terrain, wind load, tower, transmission and distribution line

中图分类号:

TM715

高雁，杨靖波. 典型微地形下的风速特性及其在输配电线路杆塔设计中的应用[J]. 中国电力, 2015, 48(7): 146-152.

GAO Yan, YANG Jingbo. Characteristics of Airflow over Typical Micro-Terrain and Its Application to Design of Overhead Transmission and Distribution Lines[J]. journal1, 2015, 48(7): 146-152.

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