Electric Furnace Transformer
Product Introduction
Electric furnace transformers are specially designed to provide power for different types of electric furnaces.
Resistance furnace transformers are used with resistance furnaces and salt bath furnaces for applications such as heating mechanical parts, heat treatment, powder metallurgy sintering and melting non-ferrous metals.
Because the resistance of the heating element may be very low or may change greatly during the heating process, a resistance furnace transformer is installed between the furnace and the power grid to reduce and regulate the input voltage.
Small-capacity, low-voltage resistance furnace transformers and salt bath furnace transformers are generally dry-type units with protective enclosures and natural cooling.
Medium-capacity resistance furnace transformers, usually ranging from several hundred to several thousand volt-amperes, are commonly oil-immersed self-cooled transformers.
Large-capacity units normally use forced-oil circulation and water cooling.
Structural Features
The transformer core is made from high-quality grain-oriented silicon steel sheets and processed using an automatic cutting line.
It adopts 45-degree fully mitred joints, a non-punched structure and a binding process without weft glass adhesive tape.
The coil uses a main longitudinal insulation structure. The winding arrangement and insulation system are selected carefully to provide sufficient mechanical strength.
The transformer offers strong short-circuit resistance, high overload capacity, high efficiency, low loss, safe operation and reliable performance.
The transformer capacity is selected according to the size of the electric arc furnace and the requirements of the smelting process.
The required smelting conditions are achieved through voltage regulation, which can be divided into on-load voltage regulation and off-circuit voltage regulation.
Large electric furnace transformers with on-load voltage regulation generally do not use a series reactor.
Small- and medium-capacity electric furnace transformers with off-circuit voltage regulation may be designed either with or without a series reactor.
Both designs can change the impedance at two voltage levels. In the first design, the impedance is changed by connecting or disconnecting the series reactor.
In the second design, the impedance is adjusted by changing the high-voltage winding of the furnace transformer itself.
Operating Conditions
- Altitude: Below 1,000 meters
- Ambient temperature: +40°C to -25°C
- Relative air humidity: 90% at +25°C
- Installation type: Outdoor
- Installation environment: Areas without corrosive gases or heavy contamination
- Applications: Steelmaking, non-ferrous metal smelting, ferroalloy production, silicon compound production and pure silicon production
