Abstract:A framing camera was used to study drawn vacuum arcs between spiral-type contacts. This design imposes a transverse (radially directed) magnetic field on the arc column. Vie fixed electrode was brazed to a cylindrical arc shield. With the fwed electrode and shield as cathode, cathode spots were observed to be produced on the shield by two mechanisms. One of these occurred only for the intense columnar arc modes which had active erosion at both the anode and cathode arc roots (IARc > -25 kA peak). In this range… Show more
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