Add time:08/29/2019         Source:sciencedirect.com

ABSTRACTBreakdown strengths of gas mixtures composed of SF6 + c-C4F8 + CO in various proportions have been studied under impulse and power frequency alternating voltages, using rod-sphere electrodes. The experiments were carried out over a pressure range extending from 100 to 400 kPa. In the pressure range between 350 kPa and 400 kPa, mixtures consisting of about 60% of SF6, 40% of CO with a small amount of c-C4F8(-1%) exhibited significantly higher dielectric strength than pure SF6 under similar experimental conditions. The increased dielectric strengths of the mixture are attributed to electron attachment and inelastic scattering effects effective over a wider range of electron energy than in a single component gas.

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