风载荷作用下V形绝缘子串的力学特性分析

Analysis of mechanical properties of V-shaped insulator string under wind load

架空输电线路在特定的风载荷作用下,其不同构件、部位的受力情况大不相同,严重时会导致输电塔线体系发生失稳乃至绝缘子串断裂,极大地影响电网运行安全。为此,以云南某山区的架空线路为研究对象,利用ANSYS有限元仿真软件,对复合绝缘子芯棒进行各向同性、各向异性特征值屈曲分析。构建了新型四联V形绝缘子串,引入系数Ph/Gv(水平载荷/垂直载荷),对比分析双联和四联V形绝缘子串在不同风载荷作用下的力学特性,对其迎风侧和背风侧的变形、最大应力及最低点水平位移进行研究。结果表明:当Ph/Gv=2.34时,V形绝缘子串背风侧的最大应力最小;随着Ph/Gv的增大,相对于双联V形绝缘子串,四联V形绝缘子串的应力变化曲线更加平缓,其最低点水平位移更小;V形绝缘子串与竖直平面的夹角为10°~30°时,角度越小,其整体性能越稳定。研究结果为V形绝缘子串的设计改进提供了有力的依据,具有较强的工程参考价值。

Under the specific wind load,the stress conditions of different components and parts of overhead transmission lines are very different.In severe cases,it can lead to instability of the transmission tower line system and fracture of insulator string even,which greatly affects the safety of power grid operation.Taking an overhead line in a mountainous area of Yunnan as the research object,the isotropic and anisotropic eigenvalue buckling analysis of composite insulator string mandrels was carried out based on ANSYS finite element simulation software.A new type of quadruple V-shaped insulator string was constructed.The mechanical properties of bigeminy and quadruple V-shaped insulator strings under different wind loads were compared and analyzed by introducing the coefficient of Ph/Gv(horizontal load/vertical load),and the deformation,maximum stress of the windward side and leeward side and horizontal displacement of the lowest point of V-shaped insulator strings were analyzed.The results showed that when Ph/Gv=2.34,the maximum stress on the leeward side of the Vshaped insulator string was minimal;as the Ph/Gv increased,the stress variation curve of the quadruple Vshaped insulator string was smoother than that of the the bigeminy V-shaped insulator string,and the horizontal displacement of its lowest point was smaller.When the angle between the V-shaped insulator string and the vertical plane was 10°-30°,the smaller the angle was,the more stable the overall performance of V-shaped insulator string was.The research provides a strong basis for the design improvement of V-shaped insulator string and has strong engineering practicability.