高压快速机械开关斥力线圈缓冲特性研究

Research on Buffer Characteristics of Repulsion Coil of High Voltage Fast Mechanical Switch

作为快速机械开关核心的斥力机构需在高速运动的斥力盘到达终点前及时介入进行缓冲降速。文中基于有限元分析法在快速斥力机构二维模型的基础上对电容放电时间、出力峰值与持续时间的影响因素进行研究与电磁缓冲仿真,仿真表明在电容能量相同且缩减线圈匝数条件下,电流峰值增加1.63 kA,峰值出力增加50.41 kN。根据仿真结果提出采用出力峰值高,出力时间缩短的电磁缓冲方案对用于缓冲的电磁线圈结构进行改进并在现有平台试验验证,通过传感器可知行程时间满足且实测弹跳距离1.2 mm,合闸电阻25.3 mΩ,研究为解决电磁缓冲导致触头墩粗使接触电阻增大导致发热与寿命问题提供一种思路。

The repulsion mechanism,as the core of the fast mechanical switch,needs to intervene in time to reduce the speed before the high-speed repulsion disk reaches the end.Based on the finite element analysis method and the two-dimensional model of the fast repulsion mechanism,the factors influencing the discharge time,output peak and duration of the capacitor are studied and the electromagnetic buffering simulation is performed in this paper.The sim-ulation shows that,on the condition of same capacitor energy and reduced coil turns,the peak current increases by 1.63 kA and the peak output increases by 50.41 kN.According to the simulation results,the electromagnetic buffer-ing scheme with high peak output and short output time is proposed to improve the structure of the electromagnetic coil used for buffering,and tested and verified on the existing platform.It can be known through the sensor that the travel time is satisfied,the actually measured bounce distance is 1.2 mm and the closing resistance is 25.3 mΩ,which provides a way to solve the problem of heating and life caused by an idea way to solve the problem of heating and service life due to contact resistance increase caused by the thick contact pier because of electromagnetic buffer.