Electric smelting magnesium smelting furnace power supply short network system with adjustable smelting zone

The utility model relates to the field of furnace and furnace short network power supply, in particular to an electric smelting magnesium smelting furnace power supply short network system with an adjustable smelting zone. Three electrodes, namely a first phase electrode, a second phase electrode and a third phase electrode, are vertically arranged above an electric smelting magnesium melting area of the variable melting area, a transformer is connected with a first-phase reelable bus, a second-phase reelable bus and a third-phase reelable bus respectively, and the first-phase reelable bus is connected with the upper portion of the first-phase electrode through a first-phase conductive large arm. The second-phase winding bus is connected with the upper portion of the second-phase electrode through a second-phase conductive large arm, the third-phase winding bus is connected with the upper portion of the third-phase electrode through a third-phase conductive large arm, and the lower end of each electrode exten