Abstract
The contribution presents the results of comparative study of typical RMF and AMF contact systems used in vacuum interrupters at typical operation conditions. An AC current pulse with a peak value up to 28 kA and frequency about 50 Hz was used. Electrodes were made of Cu-Cr. In addition to conventional arc current and voltage measurements, various optical diagnostics have been used. The arc dynamics was observed by a high-speed camera. Near infrared radiation (NIR) spectroscopy determined the anode surface temperature after current zero crossing. During the active phase, a high-speed camera equipped by a narrow band filter was applied for acquisition of qualitative distribution of the anode surface temperature. In addition, the density of neutral chromium vapour close to the current zero crossing was measured by means of broadband optical absorption spectroscopy. Three Cr I resonance lines at 425.43 nm, 427.78 nm, and 428.97 nm are used for the analysis. Special attention was put on the behavior after current interruption. The results for measured temperature evolution of anode surface temperature along with the corresponding Cr density are presented and discussed.
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