Friday 11
J. Test Techniques and Diagnostics
Chair: J. Schein, J.E. Jones - Each talk is 10'+2' duration
› 11:30 - 11:45 (15min)
› Cabannes
Investigations on the Interaction between Switching Arc and Quenching Gas in Insulating Nozzles by Optical Measurements
Paul Gregor Nikolic  1, *@  , Artur Mühlbeier  1@  , Patrick Stoller  2@  , Armin Schnettler  1@  
1 : Institute for High Voltage Technology - RWTH Aachen University  (RWTH Aachen - IFHT)  -  Website
Schinkelstrasse 2 D-52056 Aachen -  Germany
2 : ABB Schweiz AG  (ABB Schweiz AG)
Segelhofstrasse 1K CH-5405 Baden-Dättwil -  Switzerland
* : Corresponding author

The optimization of today's switching technologies as well as the development of new switching technologies require a deep understanding of the physical processes during the current interruption process. Optical measurement methods – in this contribution the background-oriented schlieren method (BOS) – allow a quantitative determination of the physical properties gas density and temperature around current zero. By this method optical measurements of the switching arc in a circuit breaker model are performed with current amplitudes of Î = 3.5 kA in air at ambient pressure with exposure times down to 200 ns. Recordings are taken either from one or from two viewing directions and density profiles are reconstructed by filtered back-projection. Characteristic changes in the flow structure, e.g., the position of the Mach disc before and after current zero are, identified. The results of CFD-simulations (computational fluid dynamics) are found to be in agreement with the measurements.


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