Breakdown electric fields in dissociated hot gas mixtures of sulfur hexafluoride including teflon: Calculations with experimental validations and utilization in fluid dynamics arc simulations - Université Toulouse III - Paul Sabatier - Toulouse INP Accéder directement au contenu
Article Dans Une Revue Journal of Applied Physics Année : 2017

Breakdown electric fields in dissociated hot gas mixtures of sulfur hexafluoride including teflon: Calculations with experimental validations and utilization in fluid dynamics arc simulations

Mohammed Yousfi
Nofel Merbahi
F. Reichert
  • Fonction : Auteur
A. Petchanka
  • Fonction : Auteur

Résumé

Measurements of breakdown voltage Vb, gas temperature Tg and density N and the associated critical electric field Ecr/N are performed in hot dissociated SF6 highly diluted in argon and in hot dissociated SF6 mixed with PTFE (Polytetrafluoroethylene or C2F4) also highly diluted in argon. Gases are heated using a microwave source and optical emission spectroscopy is used for measurements of Tg and N while Vb is measured from a specific inter-electrode arrangement placed inside of the cell of the hot gas conditioning. The experimental Ecr/N data in the numerous considered cases of gas temperatures and compositions have been used to evaluate and validate the sets of the collision cross sections of the 11 species involved in hot dissociated SF6 (i.e. SF6, SF5, SF4, S2F2, SF3, SF2, SF, S2, F2, F, S) , the 13 additional species involved either in hot C2F4 or CF4 (C2F6, C2F4, C2F2, CF4, CF3, CF2, CF, F2, F and carbon species as C, C2, C3, C4) and also the 2 further species (CS and CS2) present only in the considered mixtures SF6+C2F4. The fitted sets of collision cross sections of all these 26 species are then used without argon dilution in hot SF6 and hot SF6+C2F4 mixtures to calculate and to analyze the Ecr/N data obtained for a wide range of gas temperature (up to 4000K) and gas pressure (8 bar and more) using a rigorous multi-term solution of Boltzmann equation for electron energy distribution function and standard calculations of hot gas composition for the species proportions. Such Ecr/N data have been then successfully used to evaluate from a CFD (Computational Fluid Dynamics) model the switching capacity at terminal fault from a coupled simulation of the electrostatic field and the hot gas flow after current zero.
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Dates et versions

hal-03778031 , version 1 (15-09-2022)

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Citer

Mohammed Yousfi, Nofel Merbahi, F. Reichert, A. Petchanka. Breakdown electric fields in dissociated hot gas mixtures of sulfur hexafluoride including teflon: Calculations with experimental validations and utilization in fluid dynamics arc simulations. Journal of Applied Physics, 2017, 121 (10), pp.103302. ⟨10.1063/1.4977864⟩. ⟨hal-03778031⟩
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