Abstract
Arc time constants are a critical parameter describing the circuit interrupting capability of circuit breakers and electric fuses. A computer code based on the ablation arc model of Kovitya and Lowke (1984) has been written to investigate the transient behaviour of an ablation-stabilized arc. It is found that the energy transfer processes can be represented by three superimposed time constants. Analysis of the arc characteristics and the energy balance equation shows that the first time constant is caused by radiative cooling and corresponds to the rapid increase of the arc temperature and diameter, the second by convection and corresponds to the response of the axial plasma flow and the third by changes of the rate of ablation of the wall. Experimental results for the first time constant are in agreement with theory.
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