Electric Furnace Transformer

Primary Voltage:6KV 10KV 33KV or Other
Secondary Voltage:0.12KV-1.5KV or Other
Power Rating: Up To 1000 MVA
Connection Type: Dyn11/Yyno or others
Transformer Type: Electric Furnace Transformer
Standards: ANSI/IEEE,CAN,DOE
Certificate: UL、CE、CSA

Electric furnace transformers are transformers designed to provide power for various electric furnaces. They are used in resistance furnaces and salt bath furnaces for heating mechanical parts, heat treatment, powder metallurgy sintering, non-ferrous metal smelting, etc. Evernew provides electric furnace transformers of various specifications with UL/CE/CSA certification.

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Electric furnace transformers are key equipment in modern industrial production and are widely used in electric arc furnaces (EAF), ladle refining furnaces (LMF), resistance furnaces, induction furnaces, etc. As a transformer specifically used for electric furnace equipment, Evernew electric furnace transformers provide efficient power conversion and transmission solutions for global industrial customers with their excellent performance and reliability.

What is an electric furnace transformer

An electric furnace transformer is a special transformer designed for electric furnaces. Its main function is to convert high-voltage power into low-voltage and high-current suitable for electric furnaces, providing the required electrical energy for industrial processes such as smelting, heating, and alloy processing.

Application areas of electric furnace transformer

Electric Arc Furnace (EAF): Used in steel production, melting metal scrap into liquid steel through a high-temperature electric arc.
Ladle Refining Furnace (LMF): Provides precise temperature control and electrical energy support during the steel refining process.
Resistance Furnace: Mainly used in heat treatment and sintering processes, providing stable temperature control.
Induction Furnace: Used for heating and melting metals, widely used in casting and smelting industries.

Read more Transformer：1000 KVA 10KV Substation Transformer

Parameter Characteristics of Electric Furnace Transformer

Electrical Parameters

Rated Power: Up to 1000 MVA
Rated Voltage: 6KV to 220KV
Rated Current: Customized according to the type of furnace
Short Circuit Impedance: Adjusted based on system requirements

Mechanical Parameters

Dimensions: Customized according to on-site installation conditions
Weight: Varies with the transformer’s power and cooling method

Thermal Performance Parameters

Allowed Temperature Rise: Oil ≤55°C, Winding ≤60°C
Efficiency: ≥99%
Noise Level: ≤60 dB under full load operation

Working Principle of Electric Furnace Transformer

Basic Working Principle

The electric furnace transformer converts high voltage current into low voltage and high current suitable for electric furnace operation through the principle of electromagnetic induction. The core components of the transformer include the iron core and windings. The iron core provides the magnetic circuit, and the windings complete the conversion of electrical energy. Through the precision-designed iron core and high-efficiency windings, Evernew electric furnace transformers ensure efficient power transmission and minimal energy loss.

Electrical characteristics of electric furnace transformer

Electric furnace transformers need to handle large currents and high powers, so they have higher electrical characteristics requirements, including adapting to the voltage and current changes of the electric furnace at different operating stages. This type of transformer usually has a good power factor and low short-circuit impedance to improve the stability and efficiency of the electric furnace operation.

Thermal management principle of electric furnace transformers

Since a large amount of heat is generated during the operation of the electric furnace, the electric furnace transformer adopts advanced cooling systems such as oil-immersed self-cooling (ONAN) and oil-immersed air cooling (ONAF) to effectively manage the operating temperature of the transformer, extend its service life, and maintain stable performance.

Contact Evernew Transformer: Order your Electric Furnace Transformer now

Types of Electric Furnace Transformer

Electric furnace transformer are specially designed to supply power to various types of electric furnaces, playing a crucial role in industrial production. Depending on the type of furnace, electric furnace transformer can be broadly categorized into three types: resistance furnace transformer, arc furnace transformer, and induction furnace transformer. Each type of transformer is optimized for specific furnace applications to meet the diverse demands of industrial production.

Resistance Furnace Transformer

Resistance furnace transformer are primarily used in applications such as heating mechanical parts, heat treatment, powder metallurgy sintering, and non-ferrous metal smelting. Due to the electrical resistance characteristics of the heating elements, resistance furnace transformer are required to adjust the input voltage to ensure stability and efficiency during the heating process.

Depending on the furnace capacity and cooling method, resistance furnace transformers can be classified into the following types:

Small-capacity, low-voltage transformer: These are typically box-type, naturally cooled dry-type transformers.
Medium-capacity transformer: These are usually oil-immersed, self-cooled transformers with a capacity range from several hundred to several thousand VA.
Large-capacity transformer: These are typically forced oil circulation water-cooled transformers, used for high-power heating applications.

Learn More: Electric Furnace Transformer

Electric Arc Furnace Transformer

Electric Arc furnace transformer are essential equipment in steel smelting, specifically designed to supply power to electric arc furnaces. Due to the high power and current demands during the smelting process, arc furnace transformer are designed with large capacities, complex structures, and stringent technical requirements. The secondary voltage typically ranges from tens to hundreds of volts, while the current can reach several thousand to tens of thousands of amperes.

To meet the requirements of power regulation and short-circuit protection during steel smelting, Electric arc furnace transformer incorporate various voltage regulation methods:

Direct Voltage Regulation: Voltage is regulated through taps on the primary winding of the transformer, and combined with △ -Y switching, multiple levels of voltage regulation can be achieved. This method is economical and practical, effectively meeting the voltage needs of different production stages.
Indirect Voltage Regulation: This method uses a series transformer for voltage regulation, suitable for more complex voltage control requirements. By adjusting the primary winding voltage of the series transformer, the output voltage can be controlled to meet the load demands of the furnace.

Induction Furnace Transformer

Induction furnace transformer are used for melting ferrous and non-ferrous metals, essentially functioning as specialized electric furnace transformer. Induction furnaces can be classified into two types based on the presence of a core:

Core-type Induction Furnace: These have a core and short-circuited secondary winding, with the secondary winding essentially being the molten metal contained in the furnace. When current flows through the primary winding, an induced current is generated in the secondary winding, which then flows through the metal, generating heat and melting the metal.
Coreless Induction Furnace: Typically used for specific smelting processes, offering higher electromagnetic efficiency.

Electric furnace transformer play an irreplaceable role in modern industry, and their design and performance directly impact production efficiency and product quality. Understanding and selecting the appropriate type of electric furnace transformer is crucial for achieving stable and efficient industrial production.

Electric Furnace Transformer Shipment

Voltage Regulation Methods for Electric Furnace Transformer

On-Load Tap Changer (OLTC)

The On-Load Tap Changer (OLTC) function allows the transformer to adjust the voltage while under load, ensuring a stable power supply to the electric furnace under varying operational conditions. This type of voltage regulation is suitable for industrial applications where frequent voltage adjustments are required, offering flexibility and continuous operation without the need to disconnect the load.

Off-Load Tap Changer (NLTC)

Off-Load Tap Changer (NLTC) voltage regulation is typically performed when the equipment is shut down, making it suitable for scenarios where voltage adjustments are infrequent. The advantages of NLTC include a simpler structure and lower cost, though it lacks the flexibility of on-load tap changers. This method is often used in applications where stability is maintained without the need for frequent voltage changes.

Automatic Voltage Regulation

With the advancement of industrial automation, automatic voltage regulation technology is becoming increasingly widespread. Automatic voltage regulation systems can adjust the output voltage based on load variations, ensuring the stable operation of electric furnaces. This method enhances efficiency and reliability, particularly in modern industrial settings where dynamic adjustments are necessary to maintain optimal performance.

These voltage regulation methods are crucial for the efficient and safe operation of electric furnace transformers, allowing them to adapt to various industrial demands and ensuring consistent performance in diverse operational environments.

Main Components of Electric Furnace Transformers

Core: High-quality silicon steel for low loss and high efficiency.
Windings: High-temperature resistant, anti-oxidation materials for durability.
Oil Tank: Stores insulating oil and dissipates heat through cooling fins.
Cooling System: Includes fins, fans, and oil pumps to prevent overheating.
Voltage Regulation Device: On-load and off-load tap changers for stable voltage.
Protection Devices: Explosion-proof and overvoltage protection.
Connection Terminals: High-voltage and low-voltage terminals for stable power transmission.

Read more: Learn about our transformer customization services

Maintenance and Care of Electric Furnace Transformers

Daily Inspection

Regular checks include visual inspections, monitoring oil levels, recording temperature, and noise levels to ensure the transformer remains in optimal condition.

Scheduled Maintenance

Conduct periodic insulation testing of the windings and oil quality assessments to ensure the long-term reliable operation of the transformer.

Fault Handling

Quickly identify and address common issues such as winding short circuits or cooling system malfunctions to maintain stable operation even in unexpected situations.