Method of preventing generation of earth circulating current in induction heating apparatus for molten steel

摘要

There is disclosed a method by which a channel-type induction heating apparatus is provided on a tundish (20), which comprises a steel receiving chamber (6) and a steel discharging chamber (7) each of which chambers is connected to the earth via molten steel flowing from a ladle, molten steel flowing into a mold, or a refractory, in such a manner that an earth circulating current is prevented from being generated. An electromagnetic connection of an induction heating coil (2) and an iron core (1) of a two-leg type or a three-leg type to a loop current circuit in the molten steel is arranged symmetrically, thereby suppressing the generation of an earth circulating current. By thus suppressing the generation of the earth circulating current, it becomes unnecessary to insulate an earth circuit as required in conventional constructions, and the maintenance of facilities becomes easier, and besides any malfunction of the equipment due to the earth circulating current is totally eliminated. <MATH>