Domestic And Foreign High Voltage Transmission Line Wind Resistant Design Specification For Comparative Study

Overhead high voltage transmission lines is a national lifeline engineering facilities,it does not destroy people’s lives once the construction and stability of the national economy will result in huge losses,but also a tremendous impact on the fate of the relationship between the national defense industry.In recent years,due to extreme weather,wind of China’s high-voltage transmission lines caused frequent accidents down,from the existing research results,wind-resistant design of high voltage transmission line problems in the development of specifications is also one of its reasons.Existing high-voltage transmission towers for wind design load calculation method in transmission lines exist some differences in the various countries in the specificatioa The main difference between this paper attempts to multiple countries,wind power transmission line design specifications reading analysis,comparing the provisions made to identify the various factors and considerations based on norm-setting,and using different outcomes with different specifications obtained by a numerical exanple specific contrast.Through literature,collecting information on the status of the selected research topics were reviewed,of national transmission line design specifications of the basic wind speed,wind load tower,guide,ground wind loads carried out a more detailed and meticulous comparison,on this basis,combined with practical engineering,numerical examples comparing national standardized formula to calculate the results of wind load,and finally put forward a reasonable proposal for the revision of the reference high voltage transmission lines resistant design specifications.The main thesis,the following:1)compare countries on the basic wind speed specification required;2)comparison of countries regulate tower wind load calculation methods;3)comparison of countries specification guide,ground wind load calculation methods;4)of the same examples using the comparison of different specifications to calculate the results.This study shows that:specification of wind power transmission line,there are still some problems,needs improvement.1)Specification of requirements for a return period of lbwer wind speeds,the need to increase;2)the need to increase the air density adjustment factor;3)tower wind load shape coefficient should not be taken on the same tower full of high value,but should,like other norms Like segmented value;4)At present,China only 500kV transmission line specification guide,ground using a wind load adjustment factor,the proposed transmission lines to other levels to develop a reasonable wind load adjustment factor.