以去离子水与乙二醇的混合液(体积分数分别为36.5%,48.7%,59.0%及71.2%,以下简称混合液)作为同轴传输线的绝缘介质,进行了μs级高电压负充电条件下的正电极击穿实验,研究了混合液的击穿电压、击穿时间、相对介电常数及电阻率与体积分数的关系.实验结果表明:在充电电压为20kV时,71.2%的混合液比36.5%的混合液的平均击穿电压提高25.1%,平均击穿时间延长10.49%,而相对介电常数减小8.68%.同时,随着充电时间的缩短,混合液的击穿电压提高.

Using the water and ethylene glycol mixtures with volume fraction of 36.5%,48.7%,59.0% and 71.2% as the dielectric of the coaxial transmission line, experimental research on the breakdown of mixtures when the inner conductor was charged negative voltage in microseconds was conducted. the breakdown strength,breakdown time,relative permittivity and resistivity of the mixtures as a function of volume fraction was studied. Compared the mixture of 71.2% to the mixture of 36.5%, the results show that the breakdown strength increased 25.1% and the breakdown time delayed 10.49%,but the relative permittivity decreased 7.91%. Furthermore, the breakdown strength of mixtures increased with the decrease of the charge time.