摘要
真空灭弧室合闸过程中,触头往往会承受较大的合闸冲击,在多次合闸操作后,触头极有可能产生疲劳破坏,从而影响真空灭弧室的工作性能。该文建立VS1型真空断路器操动机构动力学仿真模型,对断路器合闸过程中动触头动态特性进行计算;并利用三维非线性显示动力学分析软件LS-DYNA对杯状纵磁触头合闸冲击碰撞过程进行模拟,得到触头结构在合闸冲击作用下各时刻的应力应变结果;在nCode软件中建立真空灭弧室触头结构疲劳寿命分析流程,对触头结构疲劳寿命危险区域进行预测,并对支撑盘结构进行优化以提高触头结构疲劳寿命。结果表明:在冲击载荷作用下,杯状纵磁触头杯指及触头片开槽处会产生应力集中现象,易发生破坏;三种支撑盘结构中,凸台型支撑盘能使触头结构应力分布更加合理,可有效提高触头疲劳寿命。
In the closing process of vacuum interrupter, the contacts often bears large closing impact. After multiple closing operations, the contacts is likely to produce fatigue damage, which affects the performance of vacuum interrupter. In this study, the dynamic simulation model of the operating mechanism of VS1 vacuum circuit breaker is established to calculate the dynamic characteristics of the dynamic contact in the closing process of the circuit breaker. The 3D nonlinear dynamic analysis software LS-DYNA is used to simulate the closing impact collision of cup-shaped axial magnetic field contact, and the stress and strain results of the contact structure at each time under closing impact are obtained. The fatigue life analysis process of vacuum interrupter contact structure is established in nCode software, the dangerous area of contact structure fatigue life is predicted, and the support plate structure is optimized to improve the fatigue life of contact structure. From the results we can see: The slots of the contact plate and the cup fingers of cup-shaped axial magnetic field contact will produce stress concentration phenomenon under shocking, which is easy to be destroyed. The convex support plate can make the stress distribution of the contact structure more reasonable among the three kinds of support plate structures and it can effectively improve the fatigue life of the contact.
作者
董华军
李东恒
钟建英
朱晔
郭方准
Dong Huajun;Li Dongheng;Zhong Jianying;Zhu Ye;Guo Fangzhun(School of Mechanical Engineering Dalian Jiaotong University, Dalian 116028 China;Pinggao Group Co.Ltd ,Pingdingshan 467001 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2022年第15期3981-3988,共8页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51477023)
辽宁省自然科学基金计划(2019-MS-036)资助项目。
