An empirical relationship for the breakdown voltage in a nonuniform field in SF6 is derived with the help of a correlation of experimental data for a rod-plane geometry. The model is based on the hypothesis that the corona shielding radius and the critical corona length are related by a simple formula. In the first approximation this formula depends on the rod radius and the critical corona length at critical pressure; for small gap lengths a correction term, dependent on the gap length, is suggested.
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Jaroslav Novák (1989) studied this question.
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