高压真空断路器的三线圈永磁操动机构分析  

Analysis of a Permanent Magnetic Actuator with Three Coils for High Voltage Vacuum Circuit Breaker

作　　者：徐喆明 房淑华[1] 林鹤云[1] 刘凯鸣 孔庆云[3] 邬钢[3] 陈亚彬[1] 柳庆东[1] 

机构地区：[1]东南大学电气工程学院,南京210096 [2]扬州北辰电气设备有限公司,江苏扬州225000 [3]扬州供电公司,江苏扬州225000

出　　处：《高压电器》2016年第3期111-117,共7页High Voltage Apparatus

摘　　要：高压真空断路器触头大开距的特点限制了永磁机构在高压领域的发展。文中提出了一种三线圈永磁操动机构,通过与其他结构的仿真对比,证明了该结构不但可以显著提高分闸速度,而且在动铁心行程的末段还可以有效地限制其冲击速度。文中提出了分段导通的控制方法,在解决三线圈结构永磁机构线圈电流过大问题的同时,进一步降低刚合速度,为真空断路器的动触头提供缓冲保护,减小触头冲击力,能够有效地抑制传统双稳态永磁机构合闸速度过快造成的触头弹跳,延长了触头寿命。An important requirement for high-voltage vacuum circuit breaker（VCB） is that its moving contact must be able to move a long distance when it works, however this character limits the development of permanent magnet actuator（PMA） in high-voltage applications. This paper proposes a three-coil PMA. Compared with two existing PMAs via simulation, the three-coil PMA can accelerate breaking speed significantly, and can limit the impact velocity of the moving iron core at last stage of stroke. Besides, a control strategy of segmental conduction is presented to solve the overcurrent problem of this three-coil PMA and reduce the rigid-closing velocity, thus providing a buffer protection for the VCB contacts and reducing the impact. By using the control strategy, the contact bounce caused by overspeed of the moving contact, which often occurs in conventional bistable PMAs as fast closing, can be suppressed effectively, hence the contact＇s life will be prolonged.

关 键 词：高压真空断路器 永磁机构 三线圈 分闸速度 触头弹跳 分段导通 

分 类 号：TM561.2[电气工程—电器]