Influence of Ablation on Differential Arc Resistance

Authors

  • L. S. J. Bort High Voltage Laboratory, Eidgenössische Technische Hochschule, Zürich
  • V. Freiermuth High Voltage Laboratory, Eidgenössische Technische Hochschule, Zürich
  • C. M. Franck High Voltage Laboratory, Eidgenössische Technische Hochschule, Zürich

DOI:

https://doi.org/10.14311/ppt.2017.2.145

Keywords:

axially blown arc, ablation, passive oscillation, MRTS, HVDC CB

Abstract

The 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.

References

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Published

2017-02-11

Issue

Vol. 4 No. 2 (2017)

Section

Articles

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