Experimental Investigation on the Initial Expansion Process in a Drawn Vacuum Arc and the Influence of Axial Magnetic Field
Experimental Investigation on the Initial Expansion Process in a Drawn Vacuum Arc and the Influence of Axial Magnetic Field
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DOI：
10.1109/tps.2011.2176963
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发表时间：
2012-02
影响因子：
1.5
通讯作者：
Xiaochuan Song;Z. Shi;S. Jia;Z. Qian;Chang Liu;Lijun Wang
中科院分区：
文献类型：
--
作者：
Xiaochuan Song;Z. Shi;S. Jia;Z. Qian;Chang Liu;Lijun Wang
在可拆卸真空室中，研究了抽真空弧的初始膨胀过程及轴向磁场对电弧膨胀的影响。借助曝光时间为2 μs的高速数码相机，研究了电弧特性。在抽真空电弧中，电弧序列从熔融金属桥架破裂后形成的桥柱弧开始。该柱演变为过渡模式，由一个中心柱组成，柱外几乎没有阴极斑点（CSs），然后进入全漫射模式。实验结果表明，在过渡模式电弧中，膨胀过程的特征是中心柱外出现了CSs，根据电弧中心柱外新CSs（导电通道）的形成和运动特点，膨胀过程可分为“慢”膨胀和“快”膨胀两种模式。研究了AMF及其分布对膨胀过程的影响。研究结果表明，AMF对抽真空电弧的初始膨胀阶段具有抑制作用和促进作用。此外，与钟形AMF相比，鞍形AMF能更有效地促进电弧向弥散模式转变。
The initial expansion process in a drawn vacuum arc and the influence of axial magnetic field (AMF) were investigated experimentally in a demountable vacuum chamber. Arc characteristics were investigated with the aid of a high-speed digital camera with an exposure time of 2 μs . In a drawn vacuum arc, the arc sequence begins with the bridge column arc formed after the rupture of the molten metal bridge. This column evolves into the transition mode, which consisted of a central column with few or no cathode spots (CSs) outside the column, and then into the fully diffuse mode. Experimental results indicated that in transition mode arc, the expansion process could be characterized by the appearance of CSs outside the central column, and could be classified into two patterns, “slow” expansion and “quick” expansion according to the characteristics of the formation and motion of new CSs (conducting channels) outside the central column of arc. The influence of AMF and its distribution on the expansion process was also investigated. Investigation results indicated that AMF had two contrary effects, i.e., inhibiting effect and prompting effect, on the initial expansion stage of drawn vacuum arc. Furthermore, saddle-shaped AMF could encourage the arc transition into diffuse mode more effectively than bell-shaped AMF.