The Validity of the Similarity Law for the Electrical Breakdown of $\hbox{SF}_{6}$ Gas
The Validity of the Similarity Law for the Electrical Breakdown of $\hbox{SF}_{6}$ Gas
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DOI：
10.1109/tps.2006.889293
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发表时间：
2007-02
影响因子：
1.5
通讯作者：
P. Osmokrović;T. Zivic;B. Loncar;A. Vasic
中科院分区：
文献类型：
--
作者：
P. Osmokrović;T. Zivic;B. Loncar;A. Vasic
本文旨在探讨几何相似定律在SF6气体电击穿中应用的合理性和局限性。为此，对SF_6气体绝缘的类似系统的介质击穿电压进行了测量。所施加的直流电压源具有8 V/s的上升速率。使用幅度为U1 max=320 V、U2 max=4.80 kV和U3 max=640 kV的标准双指数过电压脉冲（上升时间T1=1.2 μ s，下降时间T2 =50 μ s）。根据实验结果和理论分析，确定了几何相似律适用于气体放电的条件。得出的结论是，电极表面形貌的几何相似性和相应的击穿电压之间没有相关性。结果表明，推广的相似律，引入电子平均自由程作为系统的线性维数，给出了一个很好的定量协议。此外，在脉冲击穿电压的情况下，有必要应用击穿可能性上升定律
The aim of this paper is to investigate the justification and the limitation of the geometrical similarity law application on the electrical breakdown of SF6 gas. For this purpose, the measurements of the dielectric breakdown voltage for similar systems insulated with SF6 gas were done. The applied dc voltage source had an 8 V/s rate of rise. Standard double exponential overvoltage pulse (rise time T1=1.2 mus, fall time T2 =50 mus) of the amplitude U1 max=320 V, U 2 max=4.80 kV, and U3 max=640 kV was used. On the basis of the obtained experimental results and theoretical considerations, the conditions under which the geometrical similarity laws are applicable on discharges in gases are determined. It was concluded that there is no correlation between the geometrical similarity of the electrode surface topography and corresponding breakdown voltages. It was shown that the extension of the similarity law, introducing the electron mean free path as a linear dimension of the system, gives a good quantitative agreement. Also, in case of the pulse breakdown voltage, it is necessary to apply the breakdown possibility rise law