Effect of water vapour on the discharge regimes and the deviations from similarity law in compressed SF6 for positive polarity
Effect of water vapour on the discharge regimes and the deviations from similarity law in compressed SF6 for positive polarity
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正极性压缩 SF6 中水蒸气对放电方式的影响以及与相似定律的偏差
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
A. Osgualdo
中科院分区：
文献类型：
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作者：
G. Berger;E. Marode;O. Belabed;B. Senouci;I. Gallimberti;A. Osgualdo
研究了正极性非均匀和准均匀场位形下干燥和潮湿压缩SF_6气体的击穿机理。与相似定律的偏差归因于SF6中存在的杂质，主要是水蒸气。实验表明，这些杂质引起的放电模式的变化。根据气体的纯度和/或场分布的不均匀性制定适当的击穿标准。特别是，在纯SF6中，当平均电场等于临界场时，发生直接流光击穿。先导击穿机制对应于临界雪崩的建立。该研究证实了对电极表面上存在的微突起的影响的拒绝。
The breakdown mechanisms in dry and moist compressed SF6 for inhomogeneous and quasi-homogeneous field configurations for positive polarity are dealt with. Deviations from similarity law are ascribed to the impurities present in SF6, mainly water vapour. It is experimentally shown that these impurities induce a change in the discharge modes. Adequate breakdown criteria are formulated depending on the degree of purity of the gas and/or the non-uniformity of the field distribution. In particular, in pure SF6, a direct streamer breakdown takes place when the mean electric field equals the critical field. The leader breakdown regime corresponds to the build-up of the critical avalanche. The study confirms the rejection of the effect of the micro-protrusions present on the electrode surfaces.