Custom furnace transformers for EAF, LF, SAF & induction furnaces — 1MVA to 90MVA, 6kV–110kV primary. IEC & ANSI certified. Built for steel, metallurgy & chemical industries. Request a quote.
Our furnace transformers are specially engineered for high-current industrial applications, including electric arc furnaces (EAF), ladle refining furnaces (LF), submerged arc furnaces (SAF), and induction furnaces. Designed for extreme electrical stress, heavy overload conditions, and continuous metallurgical operation, they deliver stable and efficient power for steel and alloy production processes.
Capacity range: 1 MVA to 90 MVA
Primary voltage: 6kV to 110kV
Secondary voltage: 80V to 1,200V (fully customizable)
Each unit is designed according to furnace process requirements and operational duty cycles.
A furnace transformer (also called an electric arc furnace transformer) is a special-purpose power transformer that converts high-voltage grid power into ultra-low voltage and extremely high current required by industrial melting furnaces.
Unlike standard power transformers, furnace transformers must withstand repeated short-circuit conditions, rapid current fluctuations, strong electromagnetic forces, and continuous overload operation during metallurgical processes.
They require reinforced winding structures, advanced cooling systems, and wide-range on-load tap changers to ensure stable arc control and efficient furnace operation.
EAF transformers are designed for steelmaking electric arc furnaces, providing high-current, low-voltage power for melting scrap steel through arc discharge between graphite electrodes.
Key features: OLTC with 32+ voltage steps (80V–1200V), reinforced copper/CTC windings, high-strength clamping system, and short-circuit withstand up to 120kA. Cooling options include ONAN, ONAF, and OFWF.
Capacity: 5–90 MVA
Primary voltage: 35kV / 66kV / 110kV
Applications: Carbon steel, stainless steel, alloy steel EAF furnaces
LF transformers supply power for secondary steel refining, where molten steel is treated for temperature adjustment and chemical composition control.
Designed for stable arc operation, lower short-circuit stress, and precise voltage regulation for refining processes.
Capacity: 1–25 MVA
Primary voltage: 6kV / 10kV / 35kV
Secondary voltage: 100V–800V
Applications: Steel ladle refining, alloy adjustment, continuous casting preparation
SAF transformers are used in ferroalloy and chemical smelting industries, delivering ultra-high current at very low voltage for continuous high-load operation.
Designed for 120% overload capability, water-cooled terminals, and high thermal endurance for long-term smelting cycles.
Capacity: 10–90 MVA
Secondary voltage: 50V–300V
Secondary current: 30kA–100kA+
Applications: Ferrochrome, ferromanganese, silicon metal, calcium carbide production
Induction furnace transformers supply rectifier and inverter systems for medium-frequency induction melting furnaces.
They are designed with low impedance, harmonic resistance, and optional multi-pulse rectifier configurations to improve power quality.
Capacity: 0.5–30 MVA
Primary voltage: 6kV / 10kV / 35kV
Secondary voltage: 500V–1000V
Applications: Cast iron, copper, aluminum, brass melting
Capacity: 0.5–90 MVA (depending on type)
Primary voltage: 6kV–110kV
Secondary voltage: 50V–1200V
Cooling method: ONAN / ONAF / OFWF
Tap changer: OLTC or fixed (application dependent)
Overload capacity: 100%–120%
Standards: IEC 60076 / ANSI C57
FEA-optimized short-circuit strength design for extreme electromagnetic stress resistance
Wide-range OLTC (32+ steps) for precise arc voltage control and energy optimization
Oxygen-free copper windings for superior conductivity and mechanical durability
Low-loss CRGO core design for improved energy efficiency
Water-cooled terminals for ultra-high current applications
High overload capability up to 120% for continuous smelting operation
Steel Industry: EAF steelmaking, ladle refining, alloy steel production
Ferroalloy Industry: Ferrochrome, ferromanganese, ferrosilicon smelting
Non-Ferrous Metals: Copper, aluminum, zinc and precious metal melting
Chemical Industry: Calcium carbide, silicon carbide, phosphorus production
Foundries: Induction melting, heat treatment, metal casting systems
Glass & Ceramics: High-temperature melting and kiln systems
Each furnace transformer undergoes full FAT testing including winding resistance, ratio test, impedance test, loss measurement, dielectric withstand, partial discharge, impulse test, temperature rise test, OLTC operation test, and oil analysis.
Third-party testing institutions: KEMA, CESI, CPRI, NEETRAC
IEC 60076 series standards
IEC 60214-1 OLTC standard
ANSI/IEEE C57.12.00
ISO 9001:2015 quality system
CE certification
KEMA / CESI type test reports
With over 20 years of engineering experience, we specialize in furnace transformer design for metallurgical industries worldwide. Our solutions are widely used in steel mills, ferroalloy plants, and chemical smelting operations.
We provide full system support including transformer, reactor, bus duct, cooling system, and control panel integration, ensuring complete compatibility and simplified project execution.
EAF transformers are designed for repeated short-circuit conditions and extreme current fluctuations, unlike standard power transformers.
We offer IEC and ANSI dual-standard designs for global projects.
Typical EAF secondary voltage ranges from 200V to 1200V depending on process stage.
Expected service life is 20–30 years with proper maintenance and oil monitoring.
We also provide retrofit and replacement solutions for existing furnace systems.
ZTELEC Yuguang Electric Technology, founded in 2014, builds on state-owned industrial expertise to deliver reliable power solutions worldwide.
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