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P: Fachverband Plasmaphysik

P 17: Atmospheric Pressure Plasmas - Poster

P 17.4: Poster

Mittwoch, 7. März 2018, 16:15–18:15, Zelt Ost

Studies of high-intensity arcs for switching applications — •Chayma Mohsni^1,2, Margarita Baeva², Sergey Gortschakow², Steffen Franke², Kamel Charrada¹, and Zouhour Araoud¹ — ¹National School of Engineering of Monastir, 5000 Rue Ibn Jazzar, Monastir 5035, Tunisia — ²Leibniz Institute for Plasma Science and Technology, Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany

Investigations of the arc dynamics during a switching-off process are important to improve the interruption performance of switching devices. Alternatives to the working gas SF6, which is classified as green-house gas with a high global warming potential have to be found for reasons of environnement protection. The presented work is concerned with modelling of an electric arc between tungsten electrodes at atmospheric pressure in various gases (Ar, Air, CO2). As a first stage, a stationary 2D arc plasma model under the assumption of the local thermodynamic equilibrium (LTE) has been established using the computational platform COMSOL Multiphysics. It accounts for the properties of the near-electrode regions in the frame of a simplified sheath model. First simulation results for various current levels will be presented and discussed. Experimental observations will be considered as a reference.