旋转电弧对火花间隙开关电极烧蚀的影响

Influence of rotary arc on the feature and electrode erosion of spark switch

根据开关间隙放电产生的电弧在自身磁场作用下沿着开关电极表面运动的设想,设计了一个旋转电弧场畸变火花开关,研究了开关电极在大电流情况下的烧蚀情况。实验结果表明,开关的工作电压为6～30kV,开关电感0.07μH,转移电荷量35.2C/shot时,铝电极non RAG结构比RAG结构的开关电极的烧蚀情况要严重得多,黄铜电极比铝电极的烧蚀要小得多。

To extend the switch lifetime by minimizing electrode erosion, rotary arc gap-switches (RAG) were proposed. The rotation of the arc can be achieved by providing an external rotating magnetic field from outside or by self-induced magnetic field. Since the rail-gap switch has the advantages of low impedance, long burn-out life, wide operating range and low jitter time. Combining the RAG and rail-gap together, a switch were designed, and the characteristic of the switch has been studied by experiment. The switch has low jitter and wide operating voltage range. The results indicate that the RAG switch employing a sharp knife-edge electrode as a third trigger electrode can distinctly reduce the electrode erosion and prolong the lifetime. The surface conditions and photomicrographs of the electrode surface of two materials (aluminum and brass) are presented.