Fundamental properties of high-temperature SF sub(6) mixed with CO sub(2) as a replacement for SF sub(6) in high-voltage circuit breakers

Sulfur hexafluoride (SF sub(6)) gas, used widely in high-voltage circuit breakers, can produce a remarkable greenhouse effect if released into the atmosphere. Fundamental properties of SFg mixed with CO sub(2) at high temperatures are presented in this paper, considering their reduction of adverse i...

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Veröffentlicht in:Journal of physics. D, Applied physics Applied physics, 2014-06, Vol.47 (25), p.1-16
Hauptverfasser: Wang, Weizong, Rong, Mingzhe, Wu, Yi, Yan, Joseph D
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Sprache:eng
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Zusammenfassung:Sulfur hexafluoride (SF sub(6)) gas, used widely in high-voltage circuit breakers, can produce a remarkable greenhouse effect if released into the atmosphere. Fundamental properties of SFg mixed with CO sub(2) at high temperatures are presented in this paper, considering their reduction of adverse impact on the environment as a replacement for pure SF sub(6) in high-voltage circuit breakers: to the knowledge of the authors, related data have not been reported in the literature. The species composition and thermodynamic properties (mass density, enthalpy and specific heat at constant pressure) are determined by the method of Gibbs free energy minimization, using standard thermodynamic tables. The transport properties, including viscosity, thermal conductivity and electrical conductivity, are evaluated by using the Chapman-Enskog method expanded up to the third-order approximation (second order for viscosity). Particular attention is paid to the establishment of a collision integral database related to a reacting species system containing basic elements of carbon, oxygen and sulfur as well as fluoride by the use of recent cross sections or interaction potentials available in the literature. The calculations, which assume a local thermodynamic equilibrium, are performed in the temperature range 300 to 30 000 K for different pressures between 0.01 and 1.6 MPa. The results obtained are compared to those of previously published studies, and the reasons for discrepancies are analysed. An evaluation of the current interruption performance by adding CO sub(2) to SF sub(6) is discussed from a microscopic point of view. The results provide reliable reference data for the simulation of switching arcs in high-voltage circuit breakers in SF sub(6)-CO sub(2) mixtures.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/47/25/255201