SF6 CIRCUIT-BREAKER ARC MODELING - INFLUENCE OF THE ELECTRIC-FIELD ONTHE ELECTRICAL-CONDUCTIVITY

The electrical conductivity of quasi-thermal SF6 plasmas is calculated as a function of the electric field by considering non-equilibrium ef fects on the electron distribution function and on the plasma composit ion. Generally, the presence of the electric field increases the elect rical conductivity. These results are then used in a SF6 circuit break er modelling during the plasma decay. Taking into account the modifica tions of the electrical conductivity due to the electric field modifie s the post-arc current and decreases the calculated interruption capab ility.