电负性气体对局部放电特性的影响
首发时间:2009-12-31
摘要:本文以低密度聚乙烯薄膜内的人工气隙作为研究对象,研究了不同氧气与氮气比例、不同湿度条件对局部放电特性的影响,得到了不同气氛和湿度条件下气隙中局部放电的三位谱图及放电量随时间变化的关系。研究表明,气隙中平均放电量随O2、N2混合气体中O2的体积百分比的增加而减小,随湿度的增加而增大,在气隙中气体为纯N2时,实验中容易出现兔形三维谱图;在气隙中湿度很高时,实验中容易出现类似正弦曲线形状的谱图,并对这些现象做出了分析和解释。
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Effect of Electronegative Gas on Partial Discharge Characteristics
Abstract:Directing toward the void inside low density polyethylene (LDPE), the study in this thesis focus on the change of the partial discharge characteristics with the electrical aging time, and on the effects of the partial pressure ratio of O2 and N2, as well as the humidity. The mean partial discharge magnitude decrease with the increase of the mixture proportion of O2, and increase with the increase of humidity. The rabbit like patterns show only when the void is filled with pure N2, and the sine-shaped like patterns show easy when the humidity is high.
Keywords: Voids Partial discharge Electrical aging q-Ф-n patterns
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