Abstract
This contribution reports on the influence of the arc ignition position on the behavior and properties of switching arc between the RMF contacts. A pulsed AC waveform with 50 Hz frequency and a current peak value of about 28 kA is used. Electrodes were made of Cu-Cr. Defined ignition positions were mechanically created on the cathode surface, with optical confirmation. Besides the arc current and voltage measurements, various optical diagnostics were used. Two high-speed video cameras equipped with narrow-band filters characterized the arc behavior, which distinguished the emission of atomic and ion copper lines. The anode activity was observed by an additional camera. Anode surface temperatures were determined applying near infrared radiation (NIR) spectroscopy after the current zero crossing. In addition, the density of neutral chromium vapor close to the current zero crossing was measured by means of broadband optical absorption spectroscopy (OAS). Three chromium atomic resonance lines around 425-429 nm were used for the analysis. The results show clear influence of initial arc position on anode temperature and chromium density.
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