Comparison of Ablation Characteristics of Polymer- Ablated Arc with Wear Polymer Material

For improvement of arc extinction performance, polymer ablation is used in circuit breaker with air insulation. Characteristics of ignition process of polymer-ablated arcs in a polymer cylinder with different radii were investigated using the numerical thermofluid arc model. As the result, it was found that even if the inner diameter of polymers increased, the polymer ablation rate hardly changed, while the arc voltage decreased because of the increase in arc radius.