Behavior of a High Current Vacuum Arc between Hollow Cylindrical Electrodes in a Radial Magnetic Field
Behavior of a High Current Vacuum Arc between Hollow Cylindrical Electrodes in a Radial Magnetic Field
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DOI：
10.1109/tps.1980.4317332
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发表时间：
1980-12
影响因子：
1.5
通讯作者：
R. Boxman;Eli Gerby;S. Goldsmith
中科院分区：
文献类型：
--
作者：
R. Boxman;Eli Gerby;S. Goldsmith
对圆柱形电极上的大电流真空电弧在径向磁场中的行为进行了实验观察。电弧维持在两个圆柱形铜电极的两端之间，直径54 mm，壁厚1.5 mm，间隔5 mm。研究了峰值为4~15kA，半幅全宽(HAFW)为8ms的弧电流脉冲，径向磁场与瞬时电流成正比，比例常数分别为4.0和6.5×10-6T/A。结果表明，在这种几何形状下，无论有无外加径向磁场，电弧都可以经历三个发展阶段：a)电弧形成，b)沿电极周向扩散电弧，c)同时存在多个集中弧柱。当施加径向磁场时，观察到两个变化：1)弧形看起来更均匀，出现更多的束状柱，分布更均匀；2)束状柱沿J？×B？方向移动，速度在5-35m/S之间。
Experimental observations were conducted on the behavior of a high current vacuum arc on cylindrical electrodes in a radial magnetic field. The arc was sustained between the ends of two cylindrical Cu electrodes, 54-mm diam and 1.5-mm wall thickness separated by 5 mm. Arc current pulses with peak values in the range 4-15 kA with a half amplitude full width (HAFW) duration of 8 ms were investigated with radial magnetic fields proportional to the instantaneous current with proportionality constants of 4.0 and 6.5 × 10-6 T/A. The arcs were photographed simultaneously with a streak camera and by a high speed framing camera and the arc voltage was recorded on a digitizing transient recorder. The results indicated that the arc in this geometry, both with and without an imposed radial magnetic field, can be characterized by three development stages: a) arc formation, b) diffuse arc along the electrode perimeter, and c) simultaneous existence of several concentrated arc columns. When a radial magnetic field was imposed two changes were noted: 1) the arc appeared somewhat more distributed in that a greater number of constricted columns were observed, and they were distributed more evenly; and 2) the constricted columns moved in the J¿ × B¿ direction with velocities in the range 5-35 m/s.