真空拉弧起始收缩过程实验研究

Experimental Study on the Initial Contraction Process of Vacuum Arc Drawing

真空电弧的形态分布主导燃弧阶段等离子体分布特性,起始收缩过程的等离子体分布对成功开断有重要影响。为了研究机构运动过程中真空电弧的起始收缩特性,分析燃弧工况对收缩持续时间的影响,文中以10 kV可拆真空灭弧室为载体,建立真空电弧工频开断实验平台及电弧形态观测系统,通过改变灭弧室参数,结合电弧图像数字处理技术,对真空拉弧起始收缩时间进行定量分析。结果表明:起始收缩电弧的持续时间基本与电流幅值和起弧电流呈较明显正相关,与机构分闸速度呈负相关。纵向磁场对中心弧柱和边缘区域作用相反,文中利于扩散的临界磁场为60 mT,当纵向磁场小于60 mT时,收缩态电弧趋向扩散;纵向磁场大于60 mT时,收缩态持续时间增大。

The configuration distribution of vacuum arc dominates the plasma distribution characteristic in the arcing stage,and the plasma distribution in the initial contraction process has an important influence on the successful interruption.In order to study the initial contraction characteristics of the vacuum arc in the process of operation of operating mechanism,in this paper,a 10 kV detachable vacuum interrupter is used as the carrier to set up the vacuum arc power frequency interruption experimental platform and the arc configuration observation system.By changing the parameters of the interrupter and combining with the arc image digital processing technology,the initial contraction time of vacuum arc is quantitatively analyzed.The results show that the duration of the initial contracted arc is in general positively correlated with the current amplitude and arcing current,and is negatively correlated with the opening speed of the operating mechanism.The action of longitudinal magnetic field to the center arc column and edge area is opposite and critical magnetic filed which is conductive to the diffusion is 60 mT.When the longitudinal magnetic field is less than 60 mT,the contracted arc tends to diffuse.When the longitudinal magnetic field is greater than 60 mT,the duration of contracted arc increases.