双线圈和螺线管复合式电磁斥力机构运动特性分析

Analysis of Motion Characteristics of Double-coil and Solenoid Composite Electromagnetic Repulsion Mechanism

为了满足高压直流断路器对其操动机构快速性和高电压等级的要求,针对126 kV真空断路器设计了一种适用于长行程且具有较高分合闸速度的新型电磁斥力机构,其由双线圈和螺线管式电磁斥力机构串联而成。首先,运用有限元方法进行电磁力仿真模拟,通过对机构的电磁斥力和位移/时间特性分析,初步验证了其可行性。然后,采用单一变量法对其运动特性进行仿真分析,得到了机构间相互配合关系和参数优化设计原则。最后,为降低分闸弹跳,设计电磁式缓冲器,分析了缓冲驱动电路参数和缓冲投入时间对缓冲特性的影响。研究表明:该电磁斥力机构具有刚分速度大,加速时间长,适用于长行程驱动的特性。在分闸电容3500μF、电压1200 V,缓冲电容3500μF、电压1800 V参数群组配合下,所设计电磁斥力机构全行程开断时间较短,仅有5.41 ms。

In order to meet the requirements of high voltage DC circuit breaker for the fast operation mechanism and high voltage level,a new electromagnetic repulsion mechanism for 126 kV vacuum circuit breaker is designed for long strokes with high breaking and closing speeds.It consists of a double-coil and a solenoidal electromagnetic repulsion mechanism connected in series.Firstly,electromagnetic force simulations are carried out using the finite element method.The feasibility of the mechanism is initially verified by analyzing its electromagnetic repulsion and displacement/time characteristics.Then,the single-variable method is used to simulate and analyze its motion characteristics.The interaction of the mechanism and the design principles for parameter optimization are obtained.Finally,the electromagnetic buffer is designed to reduce the bouncing of the break.The effects of buffer drive circuit parameters and buffer input time on buffer characteristics are analyzed.The study shows that the electromagnetic repulsion mechanism has the characteristics of large rigid separation speed,long acceleration time,and suitable for long stroke drive.The designed electromagnetic repulsion mechanism has a short full-stroke opening time,only 5.41 ms,with the cooperation of the parameter groups of 3500μF and 1200 V for the breaking capacitor and 3500μF and 1800 V for the buffer capacitor.