真空断路器电流峰值后弧柱收缩状态研究  

Arc-Column Contraction of Falling Peak-Current in Vacuum Circuit Breaker: An Experimental Study

作　　者：董华军[1] 王正奇 刘政君[1] 郭英杰[1] 李杰[1] Dong huajun;Wang Zhengqi;Liu Zhengjun;Guo Yingjie;Li Jie(School of Mechanical Engineering,Dalian Jiaotong University,Dalian 116028,China)

机构地区：[1]大连交通大学机械工程学院,大连116028

出　　处：《真空科学与技术学报》2018年第11期944-948,共5页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金项目(No.51207016;No.51477023);辽宁省教育厅项目(No.JDL2017032)

摘　　要：真空断路器熄弧阶段的电弧形态变化直接影响弧后介质恢复强度,进而影响开断的成功与否。为探究熄弧阶段电弧收缩状态,利用高速摄像机对电弧图像进行数字采集,并结合图像特征提取与角点检测技术,对弧柱边缘进行提取。计算5. 5～7. 4 ms时间弧柱直径变化范围为155～20像素,运用曲线三次拟合方法,绘制弧柱收缩速度曲线,结合外加磁场收缩力与电弧粒子气体压力相互作用原理,解释了6. 0～6. 7时间内收缩速度平稳过渡情况,以及6. 7 ms以后的速度激增。通过此次实验得到的相关电弧形态参数,为纵向磁场真空断路器的优化设计提供一定的技术参考。Contraction of arc column, at the initial stage of arc distinguishing in vacuum circuit breaker, was experimentally studied with a high-speed charge coupled device （CCD） video camera to understand the correlation between the are - shape＇ s evolution on the arc-extinguish behavior and dielectric recovery. The arc column edges were extracted via image processing in Harris corner detection algorithm and by feature extraction technology. The time dependent diameter of are column, in 5.5 - 7.4 ms within 155 - 20 pixels, was evaluated by data analysis ; and by 3rd-order polynomial data-fitting, the arc column contraction went through two distinctive modes： the diameter first decreased roughly at a steady rate from 6.0 to 6. 7 ms, and then （ after 6.7 ms） , rapidly shrank, simply because of the magnetic field, contraction of arc itself and gas pressure. Possible mechanisms explaining the arc-shape growth were also tentatively discussed in a thought provoking way.

关 键 词：熄弧 角点检测 磁场力 收缩速度 

分 类 号：TM561[电气工程—电器]