Abstract
Metal vapor generation due to the high-current anode phenomena can still exist even after current interruption and presents a potential source for arc re-ignition in the presence of transient recovery voltage. Determination of the vapor density and its dynamics with respect to different anode modes and after current zero is therefore of great importance. This paper presents the results of Cu and Cr density measurements after current zero using broadband absorption spectroscopy. Three Cr I resonance lines at 425.43 nm, 427.78 nm, and 428.97 nm and two Cu resonance lines at 324.75 nm and 327.39 nm are used for the analysis. An AC current pulse with maximum of about 5 kA and frequency of 50 Hz is applied. Electrodes made of CuCr7525 with diameter of 10 mm are used.
Published Version
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