Arcing in SF₆-MV-switchgear. Pressure rise in equipmentroom

摘要

The authors discuss fault arcing in a MV transformer substationwith a comparison between SF₆ and air insulated switchgear.The work is concentrated on the overpressure (pressure rise) in thecable and transformer compartments. There is reason to believe thatpressure rise should be higher with SF₆ compared to air. Fullscale tests have shown that the maximum pressure rise is about equal forSF₆ and air, but with a significantly longer duration of thepressure rise in the case of SF₆. It has been found difficultto simulate practical conditions by small scale model tests