Electron avalanches I - Statistics of partial microdischarges in their pre-streamer stage

被引:17
作者
Ficker, T [1 ]
机构
[1] Tech Univ Brno, Dept Phys, CZ-60200 Brno, Czech Republic
关键词
electron avalanches; streamers; statistics of electron avalanches; space charge of electron avalanches; Pareto distribution; partial microdischarges near dielectric barriers;
D O I
10.1109/TDEI.2003.1219654
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Three kinds of statistical distributions of dc microdischarges in homogeneous electric field are discussed. So far the exponential and streamer distributions have been considered as regular statistics describing microdischarge electron avalanches with low ((n) over bar < 10(5)) and high ((n) over bar > 10(8)) average carrier populations, respectively. The distributions of avalanches with intermediate populations (n) over bar is an element of (10(5), 10(8)) that exhibit peculiar convex shapes have not been considered as regular distributions so far. They have been regarded as an experimental artefacts causing deviations from the regular exponential law. On the basis of refined experiments we argue for a new interpretation of those peculiar distribution curves. They have proved to be independent of the remaining two regular statistics and manifest a new distribution law well approximated by the Pareto distribution. The basic physics underlying this separate statistical distribution is intimately related to the inner space charges formed inside the avalanches with higher carrier populations. The inner space charges that modify the local intensity of the electric field and result in redistribution of populations and manifestation of a new statistical behavior.
引用
收藏
页码:689 / 699
页数:11
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