Electric Furnace Transformer

Furnace Transformer Description:

· Sourceway Electric furnace transformers are designed according to IEC/IEEE.

The electric furnace transformer is also called "smelting transformer", and its load is the electric furnace. Different from general IF equipment. This kind of transformer generally has a primary 10KV, and the secondary varies from 40 to 130 volts as needed. The current ranges from several thousand to tens of thousands of amperes, and the capacity is usually large. Both split and integrated. Use carbon rods as electrodes. Commonly used in electric furnace smelting of special steel, white corundum, electrolytic aluminum, etc.

Furnace Transformer Standard Features Include:

· Surge Arrester for Primary

· Versatile design with respect to customer requirements and space availability

· Design to all types of environments

· Design to all types of Input ( 50Hz & 60Hz)

· On Load Tap are available ( OPTIONAL )

· High Efficiency units with low operating temperatures

· Single and Multi-pulse circuit configurations.

· Superior short circuit withstand

· Pressure Relief Device

· Pressure Vacuum Gauge

· Oil Thermometer

· Drain Valve

· Upper Fill Valve

· Lifting Lugs

Furnace Transformer Basic Specification:

(1) Primary rated voltage. This voltage is the voltage applied by the power supply network to the primary coil of the transformer, that is, the standard voltage of the power supply network, mainly including 6kV, 10kV, 35kV and 110kV.

(2) Secondary voltage. The secondary voltage is also known as the low-side voltage. Its size and its series mainly depend on the requirements of the steelmaking process, and its range is generally between 100 and 1200V.

(3) Rated current. No matter how the transformer is connected, the rated current in the low-voltage side coil remains unchanged; while the current in the high-voltage coil changes with the change of the secondary current.

(4) Rated capacity. The capacity at the highest secondary voltage is defined as the rated capacity of the electric arc furnace transformer.

(5) Power supply frequency. In China, the power frequency f=50Hz, but in other countries, the regulations of the power frequency are different based on local electrical system.

(6) The connection line and connection group of the coil. When the coils are connected in a Y-△ shape or a △-△ shape, the connection group label is Yd11 (11 means the primary and secondary phase angles differ by 11°) or Dd0 (0 means the primary and secondary phase angles differ by 0°).

(7) Efficiency. Generally, η = 95% to 98% for small and medium-sized transformers, and η = 99% for large transformers.

Electric furnace transformer is just one of our hot selling products. Souceway also produce substation power transformer, pad-mounted transformer, dry-type transformer, etc... With different internatioanl standards and certifications, Souceway will be your trusted transformer supplier.

Furnace Transformer Basic Specification:

(1)The mechanical force is small and the strength is good

· The radial electromagnetic force of the electric furnace transformer is small. Although the axial electromagnetic force is relatively large, it can be significantly reduced when there are many flux leakage groups. The windings are completely surrounded by insulating parts, and the iron core surrounds them. The iron core and the fuel tank are clamped with wooden stays, and the whole body is fastened firmly. The short-circuit force is directly transmitted to the oil tank through the insulating part and the iron core, and its mechanical strength is high.

(2)Windings have strong impact resistance

· The electric furnace transformer winding has few wire cakes, large radial size, large capacitance between wire cakes, and small ground capacitance. When the impulse voltage acts on the electric furnace transformer, the initial voltage is linearly distributed, and the voltage gradient is greatly reduced. At the same time, due to the large inherent capacitance of the electric furnace transformer, the winding voltage oscillation time is prolonged, and the transient voltage has decayed before the winding reaches the amplitude, and its winding has a good ability to withstand overvoltage shocks.

(3)Low impedance

· Each phase of the electric furnace transformer can be divided into several magnetic leakage groups, and the radial size of the wire cake is large, and its mechanical force and load loss are small. Since the reactive power of the transformer is greatly reduced, the power factor of the electric furnace naturally increases.

(4)Phase-separated voltage regulation has no effect on the magnetic circuit

·Due to the asymmetry of the three-phase magnetic flux of the split-phase voltage regulation, the core transformer must use a five-column iron core. But in the core of the shell-type transformer, each phase already has an independent magnetic circuit, and the asymmetry of the magnetic circuit does not affect the design of the core.

(5)The leads are short and easy to balance the impedance

· The lead-out wires and branch wires are drawn out from the upper part of the winding as short as possible, and the low-voltage winding leads can be of the same length, thereby eliminating the impedance imbalance of the low-voltage lead wires and reducing the power transfer during the operation of the electric furnace.

(6)Low loss

· The winding of the transformer adopts the structure with multiple magnetic leakage groups. When the capacity of a single transformer increases, the number of flux leakage groups also increases at the same time, but the capacity of each flux leakage group does not increase, so the leakage flux density, transformer axial short-circuit force and the ratio of additional loss do not increase, There will be no local overheating. The long side of the rectangular winding of the transformer is surrounded by the iron core, and the leakage flux diffusion space of the exposed winding is small, and the additional loss is reduced. The winding is surrounded by the iron core, which has a certain shielding effect, and the stray loss of the fuel tank is small.

Furnace Transformer Basic Specification:

· Convert the three-phase three-wire grid into a single-phase two-wire grid to meet the needs of various electrical equipment.

· Improve the load characteristics and power quality by adjusting the tap point.

· Use the principle of magnetic saturation for speed regulation operation to achieve the purpose of saving energy.

· Used for high-parameter rectifier units as inverter stations, excitation voltage regulation of DC generators, and voltage boosting of DC transmission;

· Used for step-down starting and control of high-voltage distribution network;

· It can be used in self-provided power stations of industrial and mining enterprises, etc.