Abstract
High-altitude regions are featured by complicated geographical environment, in which strong wind events occurs frequently. At present, the engineering meteorological data of relevant projects are limited. Moreover, the rationality of determination methods of design wind loads for power transmission lines in the high-altitude regions is still unclear, which severely threatens the safety of power transmission lines. Therefore, this paper focuses on actual full-scale measurements of wind fields along power transmission lines in the high-altitude strong wind regions. The average wind speed and turbulence intensity characteristics under the typical high-altitude terrains terrain are analysed. Through the profile fitting of power law profile and the analysis on probability of actually measured data, the value scopes of parameters, such as profile index, are obtained. Through comparing with existing Chinese codes, some theoretical reference and basis for the wind-resisting design and maintenance of power transmission lines in relevant regions are suggested.
Highlights
The southwest region is an important energy base in China, in which accelerating hydropower development is an important measure to implement the national energy development strategies in China
According to the principle of takes the value of strong wind speed as 8m/s, this paper conducts fitting to the average wind speed data distributed along with heights measured in Shenzha County, Naqu City, and researches the change laws of average wind speed and its wind profile index along with time during the actual measurement period
Based on the wind speed data measured in Shenzha County, this paper examines the turbulence intensity characteristics within the actual measurement time period
Summary
The southwest region is an important energy base in China, in which accelerating hydropower development is an important measure to implement the national energy development strategies in China. The geographical environments in Sichuan, Tibet and Chongqing in the southwest of China are complicated, which include multiple kinds of topographic conditions such as Qinghai-Tibet Plateau, Sichuan Basin and Qinba Mountainous Regions, with relatively high altitudes, large differences in geographical environments, and frequent occurrence of strong wind weather. These severely threaten to power facilities[1]. There are relatively large differences between wind field parameters such as wind profile and turbulence intensity in the high altitude southwest regions compared with those in the lowaltitude regions The influence of these differences in design wind load values are still not mentioned in the current design codes of power transmission lines. A certain theoretical references for the construction and maintenance of power transmission line in relevant regions in the future are suggested
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