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{\rm CO}_{2} as an Arc Interruption Medium in Gas Circuit Breakers

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4 Author(s)
Stoller, P.C. ; ABB Corporate Research Center, Baden-Dättwil, Switzerland ; Seeger, M. ; Iordanidis, A.A. ; Naidis, G.V.

${rm CO}_{2}$ is a possible alternative to ${rm SF}_{6}$ —which has a high global warming potential—as the interruption medium in gas circuit breakers. The performance of ${rm CO}_{2}$ is investigated in this paper by carrying out experiments in representative test devices and by performing computational fluid dynamic (CFD) simulations; some comparisons with ${rm SF}_{6}$ and air are given. It is found that the thermal interruption performance of ${rm CO}_{2}$ is lower than that of ${rm SF}_{6}$, but higher than that of air. The measured dielectric recovery after arcing is compared for ${rm CO}_{2}$ and ${rm SF}_{6}$; a streamer model is used to calculate the breakdown voltage in ${rm CO}_{2}$; 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 for ${rm SF}_{6}$, ${rm CO}_{2}$, and air. CFD simulations of the pressure buildup in ${rm CO}_{2}$ and ${rm SF}_{6}$ both illustrate the qualitative differences between the two and show good agreement with measurements.

Published in:

Plasma Science, IEEE Transactions on  (Volume:41 ,  Issue: 8 )

Date of Publication:

Aug. 2013

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