Abstract The final jump is an essential process of long air gap discharge. This paper will focus on the experimental study on the characteristics of the final jump stage under positive switching and lightning impulses in the long air gaps. To demonstrate the propagation of the leader, a high-speed camera (FASTCAM SAX2) was used to record. The lightning impulse (1.9/50 μs) that was produced by a 7.2 MV Marx generator applied to the 3 m or 5 m air gaps. By looking at the results for the gaps as mentioned above; the observation results showed that the average final jump length under lightning impulse is 1.06 m and 1.91 m, respectively. The average velocity during the final jump phase under positive switching and lightning impulses is obtaining from the observation images by fitting the measurements. According to the discharge images, the method to calculate the length and velocity during the final jump stage. Finally, the current under the lightning impulse voltage is thousands of amperes as compared to switching impulse.

中文翻译：

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长气隙放电最终跳跃阶段的实验研究

摘要 最后一跳是长气隙放电必不可少的过程。本文将重点对长气隙中正开关和雷电脉冲作用下末级跃迁特性进行实验研究。为了演示领导者的传播，使用高速摄像机（FASTCAM SAX2）进行记录。由 7.2 MV Marx 发电机产生的闪电脉冲 (1.9/50 μs) 应用于 3 m 或 5 m 气隙。通过查看上述差距的结果；观测结果表明，雷电冲击下的平均最终跳跃长度分别为1.06 m和1.91 m。在正开关和闪电脉冲下的最后跳跃阶段的平均速度是通过拟合测量从观察图像中获得的。根据出院图片，计算最后跳跃阶段的长度和速度的方法。最后，与开关冲击相比，雷电冲击电压下的电流为数千安培。