CO₂is a possible alternative toSF₆—which has a high global warming potential—as the interruption medium in gas circuit breakers. The performance ofCO₂is investigated in this paper by carrying out experiments in representative test devices and by performing computational fluid dynamic (CFD) simulations; some comparisons withSF₆and air are given. It is found that the thermal interruption performance ofCO₂is lower than that ofSF₆, but higher than that of air. The measured dielectric recovery after arcing is compared forCO₂andSF₆; a streamer model is used to calculate the breakdown voltage inCO₂; good agreement with measurement is found. The speed of sound and the adiabatic coefficient, important parameters that influence pressure buildup and gas flow, are compared forSF₆,CO₂, and air. CFD simulations of the pressure buildup inCO₂andSF₆both illustrate the qualitative differences between the two and show good agreement with measurements.
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Stoller et al. (2013) studied this question.
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