特高压复合支柱绝缘子力学性能试验研究

摘要

为了研究特高压实心复合支柱绝缘子的力学性能,对其进行了静力侧推试验和动力特性测试.通过在支柱绝缘子芯棒根部布置应变片、顶部布置位移计和加速度计来获取支柱绝缘子芯棒根部应变、力-位移关系以及绝缘子破坏前后的基频.结果显示,复合支柱绝缘子的破坏主要表现为绝缘子法兰的断裂破坏或绝缘子芯棒与法兰之间胶装部位的粘结破坏,且绝缘子破坏后基频明显降低.绝缘子在侧向力作用下的力-位移关系整体上可分为线弹性和弹塑性两个阶段.在其他参数相同的条件下,绝缘子的侧向承载力主要由法兰高度决定,法兰高度越大,其内部与绝缘子胶装高度越高且粘结效果越好,则支柱绝缘子的抗侧刚度及侧向承载力就越大;对于法兰无加劲肋的复合支柱绝缘子,其各组成部分的侧向承载能力是不同的,其中绝缘子芯棒的侧向承载能力要明显高于法兰和粘结材料.%In order to study the mechanical properties of UHV solid composite post insulators,static lateral push test and dynamic property test are carried out.The strain at the bottom of composite post insulators,the force-displacement relationship,and fundamen-tal frequencies before and after the failure are obtained by arranging strain gauges at the bottom of the post insulators,displacement transduces and accelerometers on the top of post insulators,respectively.It's observed that the fractures on the metal flanges and the bond failure between the post insulator bar and the flange are the most common failure modes,and the fundamental frequency of the post insulators decreased significantly after its failure.The force-displacement relationship of the post insulator under lateral force can be divided into linear elasticity stage and elastic-plasticity stage.Except for the other parameters,the lateral load bearing capacity of the post insulators mainly depends on the height of flanges.Due to the higher bonding region and the better bonding effect,the insulator with a lager flange height will have a greater lateral load bearing capacity when other parameters of the post insulator bar are the same.For composite post insulator without reinforcement rib on the flange,the lateral bearing capacity of its components is different,and the bearing capacity of post insulator bar is higher than that of the flange and the bonding material.