风载下特高压变电站主变套管端部力学特性分析

Analysis on Mechanical Characteristics of the Main Transformer Bushing End in UHV Substation under Wind Load

以某特高压变电站主变套管端部为研究对象,以Abaqus软件为平台,建立引跨线及主变套管端部精细化有限元模型,分析了风向、风速对套管端部力学性能的影响。结果表明:主变套管端部的端子板及接线柱应力和位移较大,为结构的薄弱环节;各零件上应力及位移随风向出现周期性变化,90°风向为最不利风向角,90°及270°风向角时有峰值,交变应力作用下零件将发生疲劳破坏;风速较小时,接线柱和端子板应力及位移变化较小,风速超过12.65 m/s后,随风速增加应力和位移均表现为非线性急剧增加,局部应力超过了屈服极限。

In the natural environment,the main transformer bushing terminal in an ultra high voltage substation is prone to deformation,fracture and other problems caused by the wind.Taking the main transformer bushing terminal as the research object,the Abaqus software is adopted as the platform for building a refined finite element model for the transmission line,down conductor and the main transformer bushing terminal,and the influence of wind direction and wind speed on the mechanical properties of the bushing terminal is analyzed.The results show that the terminal board and bushing terminal have large stresses and displacements,which are the weak links of the structure.The stress and displacement of each part change periodically with the wind direction.The 90°wind direction is the most unfavorable wind direction angle,and there are peaks at 90°and 270°wind direction angles,and these parts will have fatigue damage under the action of alternating stress.When the wind speed is low,the stress and displacement of the bushing terminal and terminal board change little;but when the wind speed exceeds 12.65 m/s,the stress and displacement of the bushing terminal and terminal board show a nonlinear sharp increase with wind speed,and the local stress exceeds the yield limit.The research results provide a reference for the design,improvement and optimization of the same type of the substation and transformer bushing terminal under the same environment.