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P: Fachverband Plasmaphysik
P 7: Theorie/Modellierung I
P 7.13: Talk
Tuesday, March 31, 2009, 16:35–16:50, HS Biochemie (groß)
Properties of electrode-arc interface models for vacuum-breakers — •Oliver Fritz1, Kai Hencken1, Thierry Delachaux1, and Dmitry L. Shmelev2 — 1ABB Switzerland Ltd, Corporate Research, CH-5405 Baden-Dättwil, Switzerland — 2Institute of Electrophysics, Russian Academy of Science, RUS-620016 Ekaterimburg, Russia
The authors present structural properties and numerical results of their model for the arc-electrode interfaces in high-current vacuum-breaker configurations. The model treats electromagnetic quantities, particle, and energy flows in a self-consistent way. It assumes the existence of an extended area on each of the two electrodes, from which the necessary electrical current, electrons and atoms for sustaining the plasma arc are injected.
Ranges of validity, sensitivity to material property parameters, and representative numerical results derived from the model are discussed and compared with experimentally observed phenomena. The authors highlight the particular usefulness of the model for predicting the arc motion under the influence of a transversal magnetic field. In addition, the spatial and temporal heat distribution and estimates on material losses in the electrode system are shown.