For the smelting scenarios of steel, non-ferrous metals, and alloys, electric furnace transformers, magnetic voltage regulators, rectifier transformers, and industrial electric heating transformers can serve processes such as electric arc furnaces, submerged arc furnaces, induction furnaces, and electrolytic smelting, withstand impact loads and short-circuit conditions, and provide strong and adjustable electrical energy guarantee for smelting, refining, and electrolysis processes.