Newtranstech heavy‑duty oil‑immersed furnace transformer for EAF, ladle refining & smelting. RoHS‑compliant, up to 150MVA domestic/100MVA global. Unique "8‑shape" LV winding, strong short‑circuit resistance, direct HV step‑down, custom configurations, low‑maintenance for metallurgical plants.
Newtranstech heavy-duty oil-immersed furnace transformers deliver stable, high-power AC output for electric arc furnaces, ladle refining and industrial smelting. Built with reinforced steel housing, integrated cooling system, RoHS-compliant low-loss silicon steel cores and high-conductivity copper windings, they ensure low energy consumption, low noise and long-term reliability in harsh metallurgical environments.
Rated up to 150 MVA (domestic) / 100 MVA (international), our fully customizable transformers support flexible voltage ratios, tap changers and secondary configurations. Featuring exclusive “8-shaped” low-voltage winding structure, the design eliminates welding joints for higher conductivity and fewer failures. It provides superior short-circuit resistance and optimized energy efficiency, while direct high-voltage step-down design reduces plant capital investment by over 30%.
Engineered for low-maintenance 24/7 operation, our transformers perfectly adapt to dynamic smelting loads and precision alloy production, lowering operational costs and maximizing production uptime.
Product Features
• Wide Voltage Regulation
Extremely wide on-load voltage regulation with stepped secondary voltage levels, fully adapted to varying arc furnace steelmaking process requirements.
• Advanced Loss Reduction
Multiple loss-reduction technologies including in-phase anti-parallel connection, electric or magnetic shielding, and transposed conductors deliver higher efficiency and lower operating costs.
• Optimal Material Utilization
Main transformer operates at constant magnetic density, maximizing material utilization and delivering outstanding economic benefits.
• Power Factor Improvement
Supports capacitor bank connection to effectively improve power factor and stabilize the grid.
• Investment Optimization
Flexible choice of on-load tap changers matched to voltage class; high-voltage side (e.g., 110kV) can directly step down to low voltage, eliminating intermediate substations and saving substantial investment.
• Superior Short-Circuit Resistance
Independent regulating coil with balanced ampere-turns plus oil-cylinder press-nail structure dramatically increases short-circuit withstand capability and overall reliability.
• Cost-Effective Protection
Three-side interruption scheme enables the use of economical, long-life low-voltage breakers instead of costly high-voltage ones.
• Robust Operational Durability
Designed to endure frequent short circuits, overvoltages, and high secondary currents typical of modern electric arc furnace operations.
Our full range of electric furnace transformer solutions also covers DC arc furnace transformers, ladle/copper package refining furnace transformers, submerged arc furnace transformers (ferroalloy, calcium carbide, yellow phosphorus, titanium slag), electroslag remelting transformers, induction furnace transformers, and single-phase graphitizing furnace transformers.
Specifications & Parameters
Example: 31500 kVA / 110 kV High Impedance Electric Arc Furnace Steelmaking Transformer – fully customizable
| Category | Specification / Description |
| Rated Capacity | 10 MVA – 110 MVA+ (custom to furnace size) |
| High Voltage Side |
6 kV – 110 kV (110 kV typical for direct step-down) |
| Low Voltage Side | Wide stepped regulation, typically 100 V – 1700 V (process-specific) |
| Connection Group | Dyn11 or customized, delta secondary preferred |
| Short-Circuit Impedance | High impedance design (8%–15% or as required) for arc stability and current limiting |
| Cooling Method | ONAN / ONAF / OFWF / ODWF (robust oil-immersed cooling) |
| Frequency | 50/60 Hz |
| Tap Changer | On-load tap changer (OLTC) with broad range |
| Loss Performance | Load loss ↓13%, No-load loss ↓17%, No-load current ↓26% vs. conventional |
| Secondary Current | Up to 100 kA+ depending on design |
| Overload & Short-Circuit Withstand | Strong mechanical and thermal margins for frequent furnace operations |
| All parameters are tailored to specific electric furnace capacity, process technology, and site conditions. |
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Packaging, Warranty & Certifications Packaging：
Professional export packaging with full moisture-proof, shock-absorbing, and anti-corrosion protection. Heavy units shipped in reinforced wooden crates or containers with secure bracing; oil and accessories packed separately.
Warranty：
12–18 months from delivery or commissioning (extensions available via service contracts). Covers material and workmanship defects under normal metallurgical use.
Certifications & Testing：
ISO 9001, IEC/IEEE/GB compliance, third-party testing (UL, KEMA, CE available). Meets international safety, performance, and environmental standards for furnace power equipment.
