The industrial frequency inductance furnace is widely used for smelting of non-ferrous metal and ferrous metal. Load of the power transformer of the industrial frequency induction furnace is smooth, without overloading requirements. To increase efficiency, low impedance and voltage are required and hard features.

The structure design is the same with electric transformers of the same capacity, with voltage adjustment means and scope variable. The transformer is divided into 3 phases. The secondary output terminal is directly connected to the power balance unit (reactor, inductor and capacitor) in one arm to make the single load converted into 3-phase symmetrical load to balance the 3-phase power supply.