The model of contact erosion at a non-stationary arc spot
DOI:
https://doi.org/10.70474/kmj-2024-1-2Keywords:
Electrical contacts, arc erosion, mathematical model, Stefan problemAbstract
The model of arc evolution and instability based on the dynamics of arc root is presented in this paper. It is shown that heating of cathode material and ejection of metallic vapors from cathode to plasma increases arc resistivity and entails arc instability at certain critical current. Phenomenon of arc-to glow transition in low current inductive electrical circuits due to arc instability is considered as a special case.
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