| 摘要 |
<p>PURPOSE:To improve productivity and an original unit and to stabilize a charge power by a method wherein the voltage of a moving electrode increased responding to an increase amount of a moving electrode is detected, and when an increase amount of the voltage of the moving electrode responding to an increase amount of the moving electrode is below a specified value, operation in a rise direction of the moving electrode is stopped for a specified time. CONSTITUTION:A voltage Vr applied on a moving electrode 4 for melting scraps 2 in a DC arc furnace 1 is detected by a voltage detector 9. According to a voltage deviation (Vd - Vr) between the detecting voltage Vr and a set voltage Vd set by means of a voltage set value 10, by means of a moving speed command value from a speed controller 21, elevation of the moving electrode 4 is effected. Through detection of a continuous increase of the moving electrode 4 to a value exceeding a specified value, through detection of the voltage of the moving electrode increased in response to an increase amount DELTAL of the moving electrode 4, and when an increase amount DELTAV of the voltage of the moving electrode responding to the increase amount DELTAL of the moving electrode 4, i.e. potential frequency X = DELTAV / DELTAL, is below a specified value, operation in a rise direction of the moving electrode 4 is stopped for a specified time T.</p> |
