Dry air is promising as an alternative insulation medium for SF₆ gas in high-voltage equipment. Since its dielectric strength is about one-third of that of SF₆ gas, one of the most effective ways to apply dry air to high-voltage gas-insulated switchgears (GISs) is to further increase gas pressure. In this article, impulse breakdown strength of dry air at high pressure under quasi-uniform electric field is measured. Furthermore, the probability distribution of breakdown voltage is predicted using the volume-time theory in consideration of initial electron generation probability in gas gap and field electron emission from an electrode. The predicted distribution of breakdown voltage by the volume-time theory is in line with the experimental results.

中文翻译：

---

利用体积-时间理论预测高压干燥空气中的脉冲击穿电压


干燥空气有望作为高压设备中SF ₆气体的替代绝缘介质。由于其介电强度约为SF ₆气体的三分之一，因此将干燥空气应用于高压气体绝缘开关设备（GIS）的最有效方法之一是进一步提高气体压力。本文测量了高压干燥空气在准均匀电场下的脉冲击穿强度。此外，考虑到气隙中的初始电子产生概率和来自电极的场电子发射，使用体积时间理论来预测击穿电压的概率分布。利用体积-时间理论预测的击穿电压分布与实验结果相符。