Direct-arc electric furnace fed with controlled current and method to feed a direct-arc furnace with controlled current

Abstract From the Canadian patent

Method to feed a three-phase direct-arc electric furnace with controlled current and also a three-phase electric furnace thus fed for the smelting of metals and advantageously but not essentially for iron-based alloys the furnace comprising means (GI) for regulation of the length of the arc by means of action on the height of the electrodes, the mains supply of the furnace including at least one medium voltage line and a transformer to serve the arc furnace, an element to regulate the arc current being comprised in each phase in the segment connecting the medium voltage line and the transformer and consisting of at least one inductor (L1), a thyristor-controlled valve (T) or alternatively a …