Breakdown Characteristics of Nonuniform Field Gap in SF6-N2 Mixtures

초록

This paper presents breakdown characteristics of SF6-N2 mixtures for the lightning and oscillating impulse voltages in nonuniform electric fields. The V-t and V-p characteristics were analyzed as a function of the applied voltage wave shape, polarity and gas pressure. The predischarge in SF6-N2 mixtures for both the positive and negative polarities develops with steplike pulses in leader mechanism. The V-t curves under the negative oscillating impulse voltage in N2(10%)-SF6 mixtures were extended over the longer time ranges. The minimum breakdown voltages for the negative lightning and oscillating impulse voltages were much higher than those for the positive lightning and oscillating impulse voltages owing to strong corona stabilization effects.