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Arc - wall interaction modelling in a low-voltage circuit breaker

E Doméjean, P Chévrier, C Fiévet and P Petit

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A hydrodynamic model for electrical arc modelling is used to study the interaction between the electrical arc and the sidewall in a low-voltage circuit breaker. The interaction model is based on an energy balance at the boundary. Comparisons of pressure, arc voltage and ablated mass between computations and experiments validate the model. The results confirm that the main mechanism at the sidewall is the photo-ablation. The model shows that, very rapidly, plastic vapours replace the air in the circuit breaker and are responsible for a residual conduction in the arc initiation region.


PACS

52.80.Mg Arcs; sparks; lightning; atmospheric electricity

52.40.Hf Plasma-material interactions; boundary layer effects

52.30.-q Plasma dynamics and flow

47.10.-g General theory in fluid dynamics

Subjects

Fluid dynamics

Mathematical physics

Plasma physics

Dates

Issue 15 (7 August 1997)

Received 19 September 1996, in final form 9 May 1997



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