Abstract
The dynamic behaviour of a double transferred arc is experimentally analysed. The arc chamber is equipped with four optical fibers aimed at the observation of arc space-time fluctuations. Terminal voltages and currents are also recorded. A particular low frequency behaviour of the arc is pointed out. It is characterized by erratic skips from rotating to quasi stable fastening on the primary nozzle-shaped anode. In either case the arc root looks rather evenly distributed than located in a definite position. The disappearing of the HF fluctuations when replacing the anode material by a better heat conductor material confirms the important stabilizating role played by the electrode cooling
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