中文摘要：

真空断路器逐渐向高压等级发展,工作时电弧等离子体几何形态直接影响其开断能力。本文利用高速摄像机对电弧几何形态进行数字采集,运用图像去噪声、选取合适阈值方法,对采集数据进行形态学操作,得到内部高能等离子体及电弧外部轮廓的时间-面积变化曲线。从引弧、稳定燃弧、熄弧及弧后介质恢复四个角度,对不同阶段的电弧面积变化做出定量分析,并探究电弧熄弧阶段电弧内外面积差变化。实验表明,通过分析不同阶段的等离子体形态变化,能够找到电弧平稳燃弧及弧后介质恢复的关键点,为高压等级真空断路器研发设计及后期电弧形态诊断提供进一步参考。

英文摘要：

The time evolution of the arc plasma morphology in vacuum current breaker（ VCB） was experimentally measured with a high speed charge-coupled-device（ CCD） camera,empirically approximated,and numerically analyzed in binary image morphological processing algorithm. First,the image threshold was phenomenally defined on the basis of the image intensity digitized with software Contour of MATLAB. Next,the time-dependent 2-D shapes and areas of the noises-filtered CCD images,enclosed by the external contours of both the arc plasma and the high energy plasma,and rapidly varying in the arc-initiation,arc-burning,arc-extinguishing anddielectric-recovery stages,were quantitatively investigated. Finally,the time-dependent variations in the difference of the two areas were evaluated. The results show that the arc plasma morphology describes well the main features in the steady state arc-burning and dielectric-recovery. We suggest that the results be of some technological interest in design and diagnosis of high voltage VCB.