Correlation of breakdown gradients in compressed air and SF6 for nonuniform fields

摘要

In a previous paper1 the authors have described the so-called “empirical” and “semiempirical” methods of estimating minimum breakdown (sparkover) voltages for gas insulated systems. The authors' special interest is with systems insulated with compressed air or SF6 at several bars pressure as might be found in high-voltage gas insulated metalclad switchgear2,3 and associated equipment. The above techniques can be used at the design stage to ensure that the statutory high-voltage test levels, including 50 Hz and lightning impulse, will be attained in practice.