【摘要】 实验研究了ns脉冲(10/30ns)下真空绝缘闪络电压随气压(10-5～10-1Pa)的变化趋势,结果表明高真空范围内的气压变化不影响绝缘闪络电压。剖析真空环境下的气体解吸附过程表明:高真空阶段时表面放气已成主 要气体负荷;气体解吸过程始于闪络发生前,且所释放气体均源于绝缘体表面的吸附气体而非背景环境;闪络时绝 缘表面已形成良好的气体放电环境,即真空中的闪络实为绝缘体表面气体解吸后形成的高气密环境中的放电过 程。更多还原

【Abstract】 Dependence of flashover voltage on gas pressur e has been experimented in high vacuum(10 -5 Pa～10 -1 Pa) using 10/30 -nanosecond pulse power. The laboratorial data show that the voltages are indep endent of the gas pressure in the range of high vacuum. As viewed from sorption and desorption, a conclusion has been made, that desorption begins early before the flashover and outgassing is the most important gas resource when gas pressur e is in the range of high vacuum. The desorbed gasses all come from insulator su rface, not from background environment. Flashover is in fact a type of gaseous d ischarge in a high-pressure phenomenon above the insulator surface.更多还原