Free burning arc black-box modeling in CO2/O2
DOI:
https://doi.org/10.14311/ppt.2025.2.136Keywords:
black-box arc models, SF6-alternatives, switching arcs, arc discharge, CO2/O2-mixturesAbstract
Black-box arc parameters were fitted from free-burning arc experiments in a 3 bar abs. CO2/O2 (90%/10%) mixture for the first time. Best fits were achieved with a novel Cassie-based model for low-current arcs. Averaged arc time parameters were τ ≈ 170 µs at low currents (20–50 A) and τ ≈ 33 µs at high currents (1–3 kA), respectively. A decrease of τ could be observed for elongated arcs. Explanations based on thermodynamic arc properties are consistent with measured variations of τ .
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