This paper presents an experimental investigation into the breakdown voltage fall time t f of lightning voltage breakdown of 2–4 centimeter vacuum gaps having a long breakdown delay time t d (>30 µs). The results show that the average 50% breakdown voltage fall time t 50 decreases with increasing vacuum gap. It is considered that the lightning impulse breakdown of the centimeter vacuum gaps with a long breakdown delay time may be initiated by the interaction between the cathode thermal processes and the micro-particles phenomena. The increase of the electrode diameter and the decrease of the electrode radius of curvature may contribute to the decrease of the breakdown voltage fall time.

中文翻译：

---

厘米级真空间隙的雷电冲击长时间延迟击穿

本文对击穿电压下降时间t进行了实验研究 F 击穿延迟时间t长的2-4厘米真空间隙的雷击电压击穿 d （> 30 µs）。结果表明，平均50％击穿电压下降时间t 50随着真空间隙的增加而减小。人们认为，具有长击穿延迟时间的厘米真空间隙的雷电冲击击穿可能是由阴极热过程和微粒现象之间的相互作用引起的。电极直径的增加和电极曲率半径的减小可有助于击穿电压下降时间的减少。