Conclusion
This paper has explored the influence of an oxygen addition on the dielectric strength of the SF6 by numerically solving the Boltzmann equation with given cross section data. The linear variation of the dielectric strength with a mole fraction of oxygen was obtained. Similar calculations were performed for SF6 + air for which only approximative estimates had existed in the literature. To check the results and for other practical reasons the method of the Boltzmann equation was applied to the SF6 + He and SF6 + N2 mixtures, the dielectric strength of which had already been explored by other authors. In comparison with other mixtures currently studied the SF6 + O2 mixture reveals rather poor dielectric properties. In spite of the fact that the oxygen is an attaching gas, its addition to SF6 and its mixtures spoils the dielectric strength. This numerical analysis exactly qualified this behaviour and it is in agreement with the few available experiments.
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Láska, L., Mašek, K., Krása, J. et al. Dielectric properties of SF6 mixtures containing oxygen and other gases. Czech J Phys 34, 1038–1047 (1984). https://doi.org/10.1007/BF01590097
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DOI: https://doi.org/10.1007/BF01590097