An Offset Transformer Radiator is a customized cooling radiator used on oil-immersed transformers where the oil inlet and outlet are intentionally offset to fit specific transformer tank layouts. Compared with straight radiators, offset radiators provide greater installation flexibility while maintaining efficient heat dissipation. When selecting an offset radiator, buyers should evaluate transformer capacity, voltage class, cooling method (ONAN/ONAF), panel size, offset dimensions, material thickness, welding quality, corrosion protection, and manufacturer experience.
An Offset Transformer Radiator is a specially engineered cooling component designed for oil-immersed transformers. Unlike a standard straight radiator, the oil inlet and outlet are positioned with an offset, allowing the radiator to fit transformers with unique tank structures or restricted installation spaces.
These radiators are widely used by:
✔ Flexible installation
✔ Better piping arrangement
✔ Reduced mechanical stress
✔ Excellent cooling efficiency
✔ Suitable for transformer retrofits
✔ Supports ONAN & ONAF cooling
✔ Long service life
✔ Low maintenance
✔ OEM customization available
| Item | Specification |
|---|---|
| Product Name | Offset Transformer Radiator |
| Cooling Type | ONAN / ONAF |
| Transformer Voltage | 11kV–550kV |
| Transformer Capacity | 50kVA–500MVA |
| Material | Low Carbon Steel |
| Steel Thickness | 1.2–2.5mm |
| Panel Width | 310 / 480 / 520 / 535mm |
| Panel Center Distance | Customized |
| Offset Distance | Customized |
| Surface Treatment | Sand Blasting + Powder Coating |
| Corrosion Protection | C3 / C4 / C5 |
| Leak Test | 100% Tested |
| Pressure Test | Yes |
| Paint Thickness | ≥80μm |
| Color | RAL Customized |
| Service Life | 25–35 Years |
Radiastar manufactures offset radiators according to customer drawings.
| Parameter | Typical Range |
|---|---|
| Height | 500–3500 mm |
| Width | 310–535 mm |
| Number of Panels | 2–40 |
| Oil Inlet Diameter | DN40–DN100 |
| Oil Outlet Diameter | DN40–DN100 |
| Flange Standard | DIN / ANSI / GB |
| Offset Height | Customized |
| Offset Width | Customized |
OEM dimensions are available.
| Transformer Rating | Recommended Radiator |
|---|---|
| 100–500kVA | 2–6 Panels |
| 630–1600kVA | 6–12 Panels |
| 2000–5000kVA | 12–18 Panels |
| 6300–10000kVA | 18–28 Panels |
| 20MVA–63MVA | Custom Design |
| 110kV–550kV | Engineering Solution |
| Material | Advantages | Recommendation |
|---|---|---|
| Carbon Steel | Low cost, high strength | ★★★★★ |
| Galvanized Steel | Better corrosion resistance | ★★★★☆ |
| Stainless Steel | Excellent corrosion resistance | Special projects |
Radiastar offers multiple coating systems.
| Coating | Suitable Environment |
|---|---|
| Powder Coating | General outdoor use |
| Epoxy Coating | Industrial plants |
| Marine Coating | Coastal areas |
| Hot Dip Galvanized | Extreme environments |
Offset transformer radiators maintain the same cooling efficiency as straight radiators while improving installation flexibility.
Benefits include:
Suitable cooling methods:
Prices vary according to:
| Product | Estimated EXW Price (USD) |
|---|---|
| Small Offset Radiator (2–6 Panels) | 80–180 |
| Medium Offset Radiator (6–12 Panels) | 180–450 |
| Large Offset Radiator (12–20 Panels) | 450–900 |
| Power Transformer Radiator | 900–2,500+ |
| Customized Engineering Radiator | Quoted per Drawing |
Note: These prices are indicative only. Final quotations depend on technical drawings, material specifications, coating requirements, order quantity, Incoterms, and destination.
Offset transformer radiators are commonly used in:
| Industry | Recommendation |
|---|---|
| Transformer Manufacturer | ★★★★★ |
| Utility Company | ★★★★★ |
| EPC Contractor | ★★★★★ |
| Renewable Energy | ★★★★★ |
| Transformer Repair | ★★★★☆ |
| Industrial Plant | ★★★★☆ |
Radiastar supports full OEM & ODM manufacturing.
Available customization includes:
CAD, STEP, SolidWorks and PDF drawings are accepted.
Before ordering, confirm:
✅ Transformer voltage
✅ Transformer capacity
✅ Cooling method
✅ Offset dimensions
✅ Panel quantity
✅ Flange standard
✅ Surface coating
✅ Installation space
✅ Ambient temperature
✅ Corrosion level
Choose a manufacturer that offers:
Radiastar is a professional manufacturer of transformer cooling systems, supplying customers in more than 60 countries.
An offset radiator relocates the oil inlet and/or outlet to match transformer tank layouts while providing comparable cooling performance to a straight radiator.
Yes. Dimensions, panel quantity, flange type, offset distance, coating, and connection positions can all be customized.
They are suitable for transformers from approximately 50 kVA up to 500 MVA, depending on the cooling design and project requirements.
Providing the following information helps ensure an accurate quotation:
Whether you need a standard replacement radiator or a fully customized OEM solution, Radiastar can support your project with engineering expertise, quality manufacturing, and global delivery.
To receive a detailed quotation, please provide:
Our engineering team will recommend the most suitable Offset Transformer Radiator solution based on your technical requirements.
