Power Transformers
Product Overview
Our high-reliability oil-immersed power transformers are engineered to withstand severe electrical stress, high thermal load cycles, and demanding environmental conditions. Configured up to 35 MVA and 245 kV, these units are ideally suited for utility transmission and sub-transmission substations, industrial processing plants (such as steel mills, chemical plants, and refineries), and large-scale renewable energy grid connections.
Key Advantages
Mechanical Resilience
Coils and magnetic cores are tightly clamped and processed under high vacuum to withstand short-circuit forces.
Thermal Management
Advanced cooling systems (ONAN, ONAF, ODAF) with optimized oil circulation channels prevent localized hotspots.
High Efficiency & Low Noise
Utilizes step-lap core joints, high-grade silicon steel laminations, and transposed copper windings to minimize losses and noise.
Long Service Life
Anti-corrosive polyurethane coating conforming to ISO 12944 (C4/C5 classifications) protects the unit in harsh coastal or industrial sites.
Core Parameters
5 - 35 MVA
Up to 245 kV
IEC 60076 / ANSI / IEEE
Common Applications
- Utility Sub-transmission & Substation Hubs
- Power Generating Stations (Thermal, Hydro, Gas)
- Renewable Energy (Large Wind Farms & Solar Parks)
- Heavy Industry (Steel Mills, Cement Plants, Mining, Refineries)
- High-Voltage Custom Infrastructures
Technical Specification Data
| Technical Parameter | Standard Range / Option |
|---|---|
| Power Ratings | 5 MVA to 35 MVA (higher ratings on request) |
| HV Voltage Level | 33 kV, 66 kV, 110 kV, 132 kV, 154 kV, 220 kV, 245 kV |
| LV/MV Voltage Level | 3.15 kV, 6.3 kV, 6.6 kV, 10.5 kV, 11 kV, 20 kV, 33 kV |
| Frequency | 50 Hz (60 Hz available on request) |
| Cooling Method | ONAN (Oil Natural Air Natural) / ONAF (Oil Natural Air Forced) / ODAF |
| Winding Material | Electrolytic Copper (standard) / Aluminium |
| Vector Group | YNd1, YNd11, Dyn11 (other combinations supported) |
| Tap Changer Type | OLTC (On-Load Tap Changer) with drive & control panel / OCTC (Off-Circuit) |
| Insulating Medium | High-grade mineral oil (IEC 60296) / Natural ester fluid |
| Corrosion Class | C4 (industrial standard) / C5-I & C5-M (harsh industrial & marine) |
Standard & Optional Accessories
Testing & Quality Assurance
Every power transformer is subjected to strict routine tests according to IEC 60076. Routine tests include: Winding Resistance, Voltage Ratio and Vector Group verification, Insulation Resistance and Polarization Index, Impedance and Load Loss, No-Load Loss, Applied and Induced AC dielectric tests. Type and special tests (e.g. Temperature Rise, Lightning Impulse, Acoustic Noise Level, Partial Discharge) can be performed upon request in accredited testing centers.
Compliance Standard
ISO 9001 & IEC 60076 Verified
Need a custom high-voltage power transformer?
Consult with our electrical engineers to design a robust, high-performance power transformer tailored for your utility, industry, or generation site.