Using the EMT Program (ATP version 1992) is simulated the limiting transient state of the single-phase and tree-phase fault currents in low voltage AC circuits by the actuating of fuses with Cu fusible element. The simulation of the electric arc was made with an black box model with four independent parameters. There are presented like curves the time evolution of the conditioning values for the actuating in limiting transient state of the electric fuses. The simulation allows us to analyse the influence of the values characterising the actuating of the fuses and the protected device on the commutation process.
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