What are the types of industrial electric furnace transformers
Electric furnace transformer is a transformer designed for power supply of various electric furnaces. Industrial electric furnace transformers can be divided into three categories: resistance furnace transformers, electric arc furnace transformers and induction furnace transformers. Mechanical parts heating, heat treatment, metallurgical sintering, non-ferrous metal exercise resistance furnace, resistance furnace transformer for salt bath furnace. Because the resistance of the heating element is too small, or the resistance of the heating element is too large during the heating process, it is necessary to equip a resistance transformer between the furnace and the power grid to reduce and adjust the input voltage of the furnace.
1. Resistance furnace transformer
Used for heating mechanical parts, heat treatment, powder metallurgy sintering, non-ferrous metal electric furnace transformers, metal exercise resistance furnaces and salt bath furnaces. Because the resistance of the heating body is too small, or the resistance of the heating body changes too much during the heating process, it is necessary to equip the resistance furnace transformer between the heating furnace and the power grid to reduce and adjust the input voltage of the heating furnace. Transformers for small-capacity, low-voltage resistance furnaces and salt-bath furnaces are mostly dry-type transformers with shells and natural cooling; transformers for medium-capacity resistance furnaces are oil-immersed self-cooling transformers. The large capacity is a forced oil circulation water-cooled transformer.
2. Electric arc furnace transformer
Special transformer for steel-making electric arc furnace. Large capacity, complex structure and high technical requirements. Its side voltage is generally between tens and hundreds of volts, requiring a wide range of conditioning; the side current is often between thousands and tens of thousands of amps. In addition, in the steelmaking process, the smelting cycle requires high power, requiring the transformer to be overloaded 2 0% within 2 hours. In the steelmaking process, because the furnace material collapses, it is easy to cause a short circuit. Therefore, the primary side of the arc furnace transformer should be connected to the current limiting reactor, or it should have a larger furnace transformer impedance to restrict the short circuit current. The operation of the electric furnace also requires that the power transformer can regulate the voltage. There are two ways to regulate the voltage of the electric furnace transformer.
3. Induction furnace transformer
The induction furnace used for smelting ferrous and non-ferrous metals is essentially a special furnace transformer induction furnace with two cores and no core. Induction furnace with iron core is a transformer with iron core and short-circuit secondary winding. The primary winding of the transformer is connected to the power supply, and the secondary winding actually has only one turn. When the primary winding is connected to the current, the secondary winding will generate an induced current and circulate in the slot, then release heat and melt the metal.