Abstract
An internal arc in single phase sf6-insulated switchgear implies the risk that the outer arc root stabilizes on a spot and punctures the enclosure after a short time. however, the burn-through times increase considerably if a rotary motion of the arc around the centre electrode takes place. this paper presents results of experimental research on the rotary motion of fault arcs and measures influencing this movement. in addition to fundamental investigations two possibilities were worked out in order to guarantee a rotary motion at definite positions of a coaxial gis.
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