纳秒脉冲下高气压SF6中同轴绝缘子沿面闪络影响因素实验研究

研究纳秒脉冲下的绝缘子沿面闪络影响因素对电磁脉冲模拟装置绝缘结构设计具有重要的借鉴意义。通过搭建绝缘子沿面闪络实验平台，实验研究了在0.5 MPa的SF6气体中，脉冲电压波形、绝缘材料和绝缘子沿面场强分布对绝缘子沿面闪络电压的影响。结果表明：绝缘子的闪络电压具有随着脉冲前沿时间减小而增加的趋势；相较于脉冲电压全波，绝缘子在脉冲电压前沿波形耐受下闪络电压较高；聚酰亚胺材料的绝缘性能最好；通过降低绝缘子沿面最大场强，改善电场分布可以有效地提高绝缘子的闪络电压。

Experimental research on influencing factors of surface flashover of coaxial insulators in high-pressure SF6 under nanosecond pulse

Studying the influencing factors of insulator flashover under nanosecond pulse has important reference significance for the design of insulation structure of electromagnetic pulse simulation device. By building an experimental platform for insulator flashover, the effects of pulse voltage waveform, insulating material and surface field strength distribution on the insulator surface flashover voltage were experimentally studied in 0.5 MPa SF₆ gas. The results show that the flashover voltage of the insulator tends to increase with the decreasing of the pulse front time; Compared with the full pulse voltage wave, the flashover voltage of insulator is higher under the front waveform of pulse voltage; The insulation performance of the polyimide material is optimal; By reducing the maximum field strength along the insulator surface and improving the electric field distribution, the flashover voltage of the insulator can be effectively increased.