Lightning impulse withstand of SF6-N2 mixtures with low SF6 content under homogeneous and divergent field

The aim of this work is to present results of lightning impulse withstand of SF₆-N₂ mixtures with low SF₆ content for pressures up to 12 bars. Comparison of experimental results with models is undertaken in the goal to determine if there is some possibility to forecast breakdown voltage from the knowledge of electrodes geometry and mixture pressure