With over 15 years of manufacturing excellence at our 18,500 m² Tien Son Industrial Park facility, SOTEK Group produces type-tested transformers for power utilities, renewable energy developments, and industrial substations globally.
Flagship
Designed for medium-voltage primary distribution networks. Features hermetically sealed corrugated tanks or conservators, high-grade CRGO steel cores, and ONAN/ONAF cooling configurations.
High Safety
Engineered for indoor environments, commercial skyscrapers, healthcare facilities, and underground substations. Self-extinguishing Class F & H insulation with zero fluid contamination hazards.
IEEE Standard
Tamper-resistant cabinet enclosure with isolated HV/LV terminal bays. Equipped with dead-front elbow connectors, Bay-O-Net fusing, and loop or radial-feed switching mechanisms.
Overhead line distribution transformers built for remote grid extensions and rural electrification. High anti-corrosion marine paint options for severe coastal and tropical climates.
Ultra-Low Loss
Advanced metallic glass alloy core technology reducing no-load core losses by 70% to 80% compared to standard CRGO steel. Accelerates decarbonization and lowers lifecycle TCO.
Renewables
Specially engineered for utility-scale PV plants and wind farms. Features split-winding inverter integration, high K-Factor harmonic suppression, and optional FR3 bio-ester fluid.
Comprehensive technical comparison across primary SOTEK product families for utility engineers and EPC procurement specialists.
| Product Line | Rating Range (kVA) | Voltage Class | Cooling / Insulation | Compliance Standards | Primary Applications |
|---|---|---|---|---|---|
| 3-Phase Oil-Immersed | 50 – 21,000 kVA | Up to 69 kV | ONAN / ONAF (Mineral Oil / Ester) | IEC 60076, TCVN 6306 | Utility Distribution, Industrial Substations |
| Cast Resin Dry-Type | 50 – 6,300 kVA | Up to 35 kV | AN / AF (Class F / H Epoxy Resin) | IEC 60076-11, ANSI | High-rise Buildings, Hospitals, Data Centers |
| Compartment Padmount | 75 – 5,000 kVA | Up to 35 kV | ONAN (Dead-front Liquid Filled) | IEEE C57.12.34, ANSI C57.12.28 | Underground Urban Grids, Commercial Complexes |
| Single-Phase Pole-Mount | 15 – 500 kVA | Up to 40.5 kV | ONAN (High-durability Oil Tank) | ANSI C57.12.20, IEC 60076 | Overhead Rural Electrification & Utilities |
| Amorphous Core Series | 50 – 2,500 kVA | Up to 35 kV | ONAN (Metallic Glass Ribbon Core) | IEC 60076, TCVN 8525 | Eco-friendly Smart Grids, Microgrids |
| Step-Up Substation (GSU) | Up to 21,000 kVA | Up to 35 kV | ONAN / ONAF (Split-Winding Design) | IEC 60076, IEEE C57 | Solar PV Farms, Wind Turbine Power Generation |
SOTEK Group operates an in-house laboratory certified under ISO/IEC 17025 (VILAS 1183). Every transformer manufactured in our Bac Ninh facility undergoes rigorous Factory Acceptance Testing (FAT) before export dispatch.
Every export shipment includes a complete technical compliance package to streamline grid integration and customs clearance for international clients: