POWER SUPPLY INSTALLATION FOR THREE-PHASE ELECTRIC ARC FURNACE WITH DOUBLE-LINK AC CONVERTER BETWEEN MAINS CONNECTION AND FURNACE TRANSFORMER

摘要

FIELD: electrical engineering.;SUBSTANCE: three-phase electric arc furnace (1) power supply installation has at least one furnace transformer (4) connected to the three-phase electric arc furnace (1) on the output side. On the input side, the transformer (4) is connected to the three-phase feeder mains (3) via the double-link AC converter (5). The double-link AC converter (5) has at least one rectifier (6) on the mains side, at least one inverter (7) on the transformer side and an intermediary AC link (8) between the rectifier (6) and the inverter (7). Each phase of the three-phase feeder mains (3) is connected, via the rectifier (6) two converter elements (11) to the intermediary AC link (8). Each phase of the furnace transformer (4) input side is connected, via the inverter (7) two converter elements (12) to the intermediary AC link (8).;EFFECT: reduction of the furnace operation interference with the feeder mains and independence of the number of phases and the furnace operational frequency from the feeder mains.;18 cl, 4 dwg