The SubArc Power Series is the engineered power heart for high-tonnage submerged arc furnace (SAF) operations, critical to the production of ferroalloys, silicon metal, calcium carbide, and phosphorus. This heavy-duty, high-current transformer is designed to deliver massive amounts of stable, low-voltage power directly into the furnace electrodes, driving the intense resistive heating required for continuous smelting and reduction processes. Built for unmatched reliability, operational efficiency, and precise control in the world's most demanding metallurgical plants.
Product Features
• Ultra-High Current, Low Voltage Output
Specifically engineered to transform medium/high grid voltage into the exceptionally low voltage (e.g., 100-300V) and immensely high current (tens to hundreds of kA) required for efficient submerged arc smelting.
• Precise Process Control & High Efficiency
Features a wide range of on-load tap changing (OLTC) capabilities, allowing for dynamic adjustment of electrode voltage and furnace power without interrupting production, optimizing specific energy consumption (kWh/ton) and melt chemistry.
• Extreme Mechanical & Electrical Robustness
Constructed with reinforced windings, massive clamping structures, and components designed to withstand tremendous electromagnetic forces and continuous thermal stress, ensuring longevity under 24/7 operation.
• Very High Short-Circuit Impedance
Designed with inherently high impedance to limit fault currents during electrode contacts or short circuits, protecting the transformer, furnace, and upstream electrical network.
• Advanced Cooling Systems
Equipped with forced-oil, forced-air (OFAF) or water-cooled heat exchangers to manage the immense heat generated by high losses, ensuring stable operating temperatures and extended insulation life.
• Flexible Winding Configurations
Offered in various connection schemes (e.g., delta, extended delta) to optimize power input characteristics and facilitate multi-electrode furnace operation (3, 6, or 9 electrodes).
Specifications & Parameters
| Category | Specification / Description |
| Primary Application | Power supply for Submerged Arc Furnaces (SAF) producing Ferroalloys, Silicon, Calcium Carbide, etc. |
| Phase |
Three-Phase (Standard for large industrial SAFs). |
| Primary (HV) Voltage | Common: 10kV, 35kV, 66kV, 110kV (Grid connection). |
| Secondary (LV) Voltage | Very Low Voltage (VLV), typically between 50V and 300V, with multiple taps. |
| Rated Capacity | From ~5 MVA up to over 100 MVA, customized per furnace size. |
| Secondary Current | Extremely high, ranging from ~20 kA to over 200 kA. |
| Short-Circuit Impedance | High, typically in the range of 8% to 25%, as required for current limiting. |
| Tap Changer | On-Load Tap Changer (OLTC) is standard for process control. Off-circuit options available. |
| Cooling Method | OFAF (Oil Forced Air Forced) is standard. Water-cooled options for highest ratings. |
| Standards | Designed per IEC, IEEE, or GB standards for furnace transformers. |
Packaging, Warranty & Certifications Packaging：
Due to its colossal size and weight, the transformer is shipped as major sub-assemblies (core and coils, tank sections) on specially engineered heavy-lift transport frames. All components are meticulously protected against moisture and physical damage. Detailed assembly manuals and supervision are provided.
Warranty：
We offer a 12-month warranty from successful commissioning or 18 months from shipment, covering material and workmanship defects. Extended warranties for critical components like the OLTC are available.
Certifications & Testing：
Our manufacturing is certified. Every transformer undergoes exhaustive testing, including routine tests, temperature rise tests, short-circuit withstand tests (if specified), and harmonic analysis. Full type test reports according to IEC 60076 or IEEE C57.18.10 are provided.
