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高电压纳秒气体开关绝缘恢复特性的实验研究

DOI: 10.13336/j.1003-6520.hve.2015.06.011, PP. 1852-1856

Keywords: 高重频,气体开关,气体放电,绝缘恢复特性,平台现象,Tesla型纳秒脉冲源,双脉冲法

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Abstract:

气体开关绝缘恢复曲线中存在的“平台现象”,大大延长了开关的绝缘恢复时间,但其存在原因尚未取得共识。为此,结合GW级Tesla型ns脉冲源,在开关工作电压约220kV情况下,研究了不同气压(0.1~7MPa)的N2、H2、SF63种气体开关的恢复特性及稳定性。结果表明对于N2、H2开关,随着气压的升高,开关恢复曲线中的“平台现象”逐渐减弱,当气压超过一定阈值后,开关“平台现象”消失;对于SF6开关,则不存在“平台现象”。可见对于N2、H2、SF63种气体“平台现象”产生的原因是不同的,同时Tesla型脉冲源对开关的“平台现象”也具有一定的影响。N2、H2、SF6气体绝缘恢复系数达到95%的最短时间分别为7.1ms、0.68ms、5.4ms。

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