本文针对我国西北第一条750kV紧凑型线路绝缘子串型式设计中涉及的机电特性问题进行了理论分析和试验研究，即（1）V型（复合和盘型）绝缘子串结构在大风条件下受力状况与设计方法；（2）V型绝缘子串安装结构对电场分布及污闪特性的影响进行了研究。首先，为了计算V型（复合和盘型）绝缘子串在大风条件下受力状况，利用ABAQUS®商用计算软件建立了V型串力学计算模型，提出一种有效的模拟计算手段，能够确定不同型式的V型绝缘子串在大风条件下的受力、变形和位移特性。然后，系统地计算分析了在各种安装夹角和各种风载下V型串的受力及摆动情况，结合载荷试验研究推荐海拔高度不超过2500m地区的750kV紧凑型输电线路V型串安装夹角为85º，而超过2500m的高海拔地区线路V型串需要90º以上的安装夹角。本文还使用有限元软件对杆塔、线路和绝缘子建模，进行V型复合绝缘子串在工作电压下的电场和电压分布计算，结果表明管径Ф80mm，环径Ф700mm可以用作750kV紧凑型线路V型复合绝缘子串的均压屏蔽环，并给出均压环配置结构参数，能较好地控制端部场强。此外，对不同安装夹角和不同悬挂方式下的绝缘子电场分布也进行了计算和探讨。最后，通过人工污秽试验研究V型复合绝缘子串安装结构及悬挂方式对交流污闪特性的影响。结果表明，复合绝缘子安装夹角和悬挂方式对其污闪特性有影响。在污秽外绝缘设计时有必要考虑实际绝缘子串的安装悬挂方式，合适的安装角度可提高V型串污闪电压。污秽度盐密/灰密为0.1/1.0 mg/cm2时，对于一定的安装角度（85º，100º），V串闪络电压较I串稍高；安装间距为400mm时，II串较I串闪络电压略有下降。

750kV double circuit compact transmission line of northwest power grid is the first compact transmission lines above 500kV in China. This thesis is focused on the theoretical and experimental research about the electromechanical performance of V-string: one is the force analysis and the design of V-string (composite and ceramic insulators) under strong wind load. The other is the influence of installing angle of V-string on the distribution of electric field and flashover performance.Firstly, this thesis deals with the force analysis of V-string (composite and ceramic insulators) applied in 750kV compact transmission line under strong wind load. V-string calculation model is conducted with applications of ABAQUS® software system. The load performance of V-string under different installing angle and different wind load conditions is presented. Combined with load experiment, the results show that the installing angle of V-string is 85 degree where the altitude is less than 2500m, and the angle is over 90 degree in high altitude area (2500m).Secondly, this thesis does the potential distribution and the electric field stress calculation of V-string using ANSOFT® software system. Base on the results, the corona ring (tube diameter 80 millimeter, ring diameter 700 millimeter) is suitable for the V-type composite insulator string (750kV). The configuration of corona ring for V-string is given with good electric field control effect. In addition, electric field distribution calculation of V-string with different installing angles is analyzed.Finally, The AC flashover characteristics of different installing angles of V -type composite insulators under different contamination patterns were studied. The test results indicate that the installing angle and arrangement of insulators can influence insulators’ flashover performance. The flashover performance of V-string can be imprived with suitable included angle. Comparing with the flashover performance of I-string, V-string flashover voltage is increased with angle (85, 100 degree) and II-string flashover voltage is decreased with distance 400mm.