Two ways to adjust voltage of electric furnace transformer

Recommended way to adjust the voltage of electric furnace transformer

1. Direct voltage regulation method: On the primary winding of the electric furnace transformer, the lead-out tap is connected to the tap changer. The △-Y switch can also be used between the three phases of the primary side to complete the secondary side voltage regulation. The △-Y switch is a very The economical voltage regulation method can reduce the secondary side voltage without changing the number of turns on the primary side. Because each phase winding has 9 taps, plus △-Y switching, a total of 29 or 18 levels can be obtained Voltage.

2. Indirect voltage regulation method: indirect voltage regulation method with series electric furnace transformer. Main transformer 1 is a 3-winding transformer (see multi-winding transformer), 1 winding is a high-voltage winding, connected to the power grid; 2 winding is a winding with a tap , Through the tap changer, it is connected in series with the primary winding 4 of the series transformer II; the 3 winding is connected in series with the secondary winding 5 of the series transformer II to supply power to the electric furnace load. Changing the primary voltage of the series transformer II through the tap changer can make 3, 5 The voltage output by the winding changes. The 3 or 5 windings connected to the load generally only need 1-2 turns, usually made of copper or aluminum plate to make a figure-8 coil.

The electric furnace transformer that requests power supply during operation can adjust the voltage, and the above are 2 kinds of voltage regulation methods.