Abstract
High-current arc behaviour in pressurized SF6 and air has been studied to gain a better understanding of the damage and component temperature rise caused by in-service faults in gas-insulated equipment. This paper presents results of a series of experiments simulating faults in a large co-axial chamber. Axial arc velocities have been measured for various fault currents, gas pressures, electrode spacings and circuit configurations. The effect of spacers on axial and azimuthal arc motion is discussed. The influence of the arc motion on the extent of damage to equipment has been investigated.
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