Experimental study of cathode spot motion and burning voltage of low-current vacuum arc in magnetic field
Experimental study of cathode spot motion and burning voltage of low-current vacuum arc in magnetic field
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DOI：
10.1109/tps.2005.856515
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发表时间：
2005-10
影响因子：
1.5
通讯作者：
K. K. Zabello-K.;Y. Barinov;A. Chaly;A. A. Logatchev-A.;S. Shkol’nik
中科院分区：
文献类型：
--
作者：
K. K. Zabello-K.;Y. Barinov;A. Chaly;A. A. Logatchev-A.;S. Shkol’nik
本实验研究处理阴极斑点（CS）的运动和燃烧电压的低电流真空电弧与电极的HCOF铜和CuCr 30的组合物，受到磁场。电流为I/spl ap/30 A的电弧在轴向和横向磁场中燃烧，感应矢量与阴极表面的夹角为5/spl deg/</spl phi/<65/spl deg/。使用直径为30 mm、间隙h=4 mm的对接端电极。场分量轴向B/sub n/和横向B/sub t/在宽范围内独立变化。横向磁场在电弧上的叠加被发现大大增加了电压U的恒定分量和噪声水平。如果这个电弧也与轴向场叠加，则恒定分量和噪声水平都减小。随着B/sub n/的增长，U（B/sub n/）在B/sub t/的不同值处的依赖性收敛到通常为V形的单个曲线。这类似于在外部轴向磁场中具有固定电流的高电流真空电弧两端的电压对磁场感应的依赖性。逆行CS运动的速度增长近似成比例的横向场的增长。对于Cu，比例因子为/spl sim/60 m/（s/spl middot/T），对于CuCr，比例因子为/spl sim/200 m/（s/spl middot/T）。轴向场的增加导致速度矢量的大小和其相对于逆行方向的旋转通过角度/spl θ/的略微减小，其值与场倾斜角/spl φ/成比例。所得结果与文献中的数据进行了比较。
This experimental study dealt with cathode spot (CS) motion and the burning voltage of a low-current vacuum arc with electrodes of HCOF Cu and with a composition of CuCr30, subjected to a magnetic field. Arcs with current of I/spl ap/30 A burned in axial and transverse fields as well as with the induction vector inclined at an angle 5/spl deg/</spl phi/<65/spl deg/ to the cathode surface. Butted-end electrodes were used with diameter 30 mm and gap h=4 mm. The field components, axial B/sub n/ and transverse B/sub t/, were varied independently over a wide range. The superposition of a transverse magnetic field on the arc was found to considerably increase both the constant component and noise level of the voltage U. If this arc is also superposed with an axial field, both the constant component and noise level decrease. With growing B/sub n/, the dependencies of the U(B/sub n/) at different values of B/sub t/ converge to a single curve that is typically V-shaped. This is similar to the dependence of the voltage across a high-current vacuum arc with fixed current in an external axial magnetic field on the magnetic field induction. The velocity of the retrograde CS motion grows approximately in proportion to the growth of the transverse field. The proportionality factor is /spl sim/60 m/(s/spl middot/T) for Cu and /spl sim/200 m/(s/spl middot/T) for CuCr. Increase of the axial field causes a slight reduction in the magnitude of the velocity vector and its rotation with respect to the retrograde direction through an angle /spl theta/, its value being proportional to the field inclination angle /spl phi/. The results obtained were compared with the data in references.