Influence of Ablation on Differential Arc Resistance
Keywords:axially blown arc, ablation, passive oscillation, MRTS, HVDC CB
AbstractThe influence of ablation on the du/di behavior of an arc in a model gas circuit breaker was examined. Specifically the transition from a state without ablation in the nozzle towards states with ablation was of interest, since prior work indicated that for high currents the voltage becomes constant or du/di gets even positive if ablation is present. Measurements with different blow pressures and rectangular DC currents of varying amplitude were compared, using PMMA-nozzles and dry air as blowing gas. Ablation was measured by weighing the nozzle, scanning the cross section, and using a coordinate measuring machine. The results agreed well, and confirmed that higher pressure shifts the du/di curve towards more favorable values.
B. Bachmann et al. Development of a 500kV Airblast HVDC Circuit Breaker. IEEE Trans. on Power Apparatus and Systems, PAS-104(9):2460–2466, 1985. doi:10.1109/TPAS.1985.318991.
T. Schultz et al. Circuit Breakers for Fault Current Interruption in HVDC Grids. In VDE-Fachtagung Hochspannungstechnik, 2016. doi:10.3929/ethz-a-010795297.
M.M. Walter. Switching Arcs in Passive Resonance HVDC Circuit Breakers. PhD thesis, ETH Zürich, 2013. doi:10.3929/ethz-a-010112102.
L. Muller. Modelling of an ablation controlled arc. J Phys D: Appl Phys, 26(8):1253–1259, 1993. doi:10.1088/0022-3727/26/8/015.
L.S.J. Bort et al. Eﬀects of nozzle and contact geometry on arc voltage in gas circuit-breakers. In 2016 IEEE Intern. Conf. on High Voltage Eng. and Appl., 2016. doi:10.1109/ICHVE.2016.7800700.
A. Ritter et al. Five years of pulsed current testing for HVDC switchgear. In 2016 IEEE Intern. Conf. on High Voltage Eng. and Appl., 2016. doi:10.1109/ICHVE.2016.7800658.
H. Schmid et al. Measuring a Small Number of Samples, and the 3v Fallacy: Shedding Light on Conﬁdence and Error Intervals. IEEE Solid-State Circuits Magazine, 6(2):52–58, 2014. doi:10.1109/MSSC.2014.2313714.
M. Seeger et al. Experimental study on PTFE ablation in high voltage circuit-breakers. J Phys D: Appl Phys, 39(23):5016–5024, 2006. doi:10.1088/0022-3727/39/23/018.
B.T. Rhodes et al. Burning rate and ﬂame heat ﬂux for PMMA in a cone calorimeter. Fire Safety Journal, 26(3):221–240, 1996. doi:10.1016/S0379-7112(96)00025-2.
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