Electric furnace transformer is a kind of equipment with low voltage, high current, high impedance and strong short-circuit resistance. The windings are mostly staggered, which can evenly decompose the high current impact in the operation of the equipment, and can be equipped with reactance coils. Low voltage and high current leads are led out from the box cover or wall by copper bar. The cooling system adopts self cooling or air smelting according to the needs of equipment operation. Manual no-load voltage regulation or electric no-load voltage regulation can be adopted. The product is mainly used for special power supply equipment such as steelmaking, toilet ore and oxide.