Nanosecond Breakdown Characteristics of <i>C</i>₄<i>F</i>₇<i>N</i> and Various Mixtures at Pressures Above 1 Atmosphere in Comparison with <i>SF</i>₆

Abstract

This report evaluates the pulsed breakdown performance of C4F7N under a 6.8 kV/ns voltage excitation. The pulsed dielectric strength of C4F7N is compared to SF6 in the same experimental setup, and it is found that C4F7N concentrations of 50% or greater are required to achieve a dielectric strength greater than or equal to SF6. Pure C4F7N demonstrated higher electric field hold-off for longer time periods and less statistical variance under pulsed conditions when compared to SF6. Mixtures of 50%C4F7N with N2 or CO2 as buffer gases showed no appreciable difference in pulsed dielectric strength.

Keywords

• <i>C</i>₄<i>F</i>₇<i>N</i>
• <i>SF</i>₆
• Novec^<i>TM</i> 4710
• pulsed breakdown
• dielectric strength
• electrical breakdown