High Current Output Capacity
Specially wound low-voltage heavy copper busbars engineered to carry ultra-high currents uninterruptedly without localized overheating or conductor displacement.
Furnace Transformers
Industrial Grade Heating Power
High-Current Furnace Transformers for Heavy Industry
Furnace transformers are critical power distribution components engineered for demanding industrial processes relying on high-temperature electric heating, such as steel manufacturing, aluminum smelting, ferroalloy production, and metal foundries. These specialized transformers step down medium grid voltages into extremely high-current, low-voltage outputs required to feed electric arc furnaces (EAF), ladle furnaces (LF), and induction heating systems.
Manufactured under strict ISO 9001:2015 quality frameworks and fully compliant with international IEC 60076 standards, Volta furnace transformers are structurally reinforced to withstand frequent short-circuit forces, intense mechanical vibrations, severe harmonic currents, and extreme thermal fluctuations common in metallurgical applications.
Technical Specifications & Range
Power Rating Capacity 250 KVA up to 20 MVA (Custom up to 25 MVA)
Primary Voltage Class 433 V, 3.3 kV, 6.6 kV, 11 kV, 22 kV, 33 kV
Secondary Low Voltage 400V, 440V, 500V, 575V, 750V, 800V, 1000V
Cooling Configurations ONAN, ONAF, OFAF, ONWF, OFWF
Voltage Tap Changer On-Load Tap Changer (OLTC) / Off-Circuit (OCTC)
Compliance & Quality ISO 9001:2015 Certified, BIS Approved (IS 1180), IEC 60076
Engineering Excellence
Key Performance & Construction Features
Engineered specifically for heavy duty cycles, severe electrical surges, and continuous extreme operations.
Precision Voltage Regulation
Integrated multi-step On-Load Tap Changers (OLTC) allow precise output voltage adjustment under full furnace load conditions to control arc temperature accurately.
Advanced Thermal & Liquid Cooling
Available with forced oil-water (OFWF) or forced oil-air (OFAF) heat exchangers ensuring rapid dissipation of heavy thermal losses during continuous melting heats.
Short-Circuit Mechanical Rigidity
Heavy-duty core clamping frames and radially supported coils withstand frequent arc-shorting forces and electromagnetic stresses inherent to electric arc operation.
Harmonic Suppression Engineering
Optimized magnetic flux design and specialized insulation systems effectively mitigate non-linear furnace harmonics, preventing premature thermal degradation.
Integrated Protection Relays
Equipped with Buchholz relays, pressure relief valves, oil level indicators, winding temperature sensors, and surge arresters for comprehensive operational safety.
Global Heavy Industrial Applications
Procurement Guidance
Furnace Transformer FAQ
Technical answers for international procurement managers and project engineers.
Volta Transformers manufactures furnace transformers ranging from 250 KVA up to 20 MVA (with custom designs up to 25 MVA / 66 KV class). We support primary voltages up to 33 kV and deliver customized low-voltage high-current secondary outputs designed to your specific furnace requirements.
Furnace operation subjects transformers to severe thermal and electrodynamic stresses. Our units feature reinforced core clamping structures, high-strength insulation materials, heavy copper busbars, and internal impedance tuning to minimize electrodynamic coil movement and suppress harmonics during arc short-circuit conditions.
Depending on ambient conditions and continuous load ratings, we supply ONAN (Oil Natural Air Natural), ONAF (Oil Natural Air Forced), OFAF (Oil Forced Air Forced), and water-cooled options like OFWF (Oil Forced Water Forced) for high-density furnace environments.