Radiation plays an important role in SF6 high voltage circuit breaker arcs, with 3 main effects: cooling down the hottest regions; heating the surrounding gas; ...
IMPROVEMENT OF RADIATION ABSORPTION IN HIGH VOLTAGE CIRCUIT BREAKER ARC C. JAN1, Y. CRESSAULT1, A. GLEIZES1 and K. BOUSOLTANE2 1
Université de Toulouse, UPS, INPT, LAPLACE 118 route de Narbonne, F-31062 Toulouse cedex 9, France 2 SIEMENS T&D ET HS TI GD, 1 rue de la Néva, BP 178, 38004, Grenoble, FRANCE
Radiation plays an important role in SF6 high voltage circuit breaker arcs, with 3 main effects: cooling down the hottest regions; heating the surrounding gas; ablation of the PTFE ([-C2F4-]n) nozzle and of the electrodes. The two last mechanisms tend to modify the properties of the plasma and to increase the pressure. We have already shown [1] that the calculation of radiation absorption in pure SF6 is not very accurate using the usual methods and the numerical computation can be improved by changing the treatment of the absorption coefficient at low temperature. This present work deals with a similar improvement of the calculation of radiation absorption in a mixture of SF6 and C2F4, following four successive steps: - Elaboration of a data base relative to the molecular absorption cross sections for molecules constituting the gas/the plasma at low temperature. - Calculation of the molecular absorption coefficient for temperature T
