Radiastar specializes in manufacturing Oil Immersed Transformer Radiators for distribution transformers, power transformers, and substation transformers. The radiator is a key cooling component that transfers heat from transformer oil to the surrounding air, maintaining safe operating temperatures and improving transformer reliability.
Our transformer radiators are widely used by transformer manufacturers, EPC contractors, utilities, transformer repair companies, and electrical equipment distributors. We provide standard and customized radiator solutions based on transformer capacity, cooling method, installation requirements, and operating environment.
Different transformer applications require different radiator designs. Radiastar provides the following solutions:
Most common cooling radiator for oil immersed transformers
Features:
Typical applications:
Designed for large transformers where transportation and maintenance are important.
Features:
Applications:
Used with cooling fans to increase heat dissipation capacity.
Features:
Applications:
| Item | Specification |
|---|---|
| Product Name | Oil Immersed Transformer Radiator |
| Application | Oil-Filled Distribution & Power Transformer |
| Cooling Method | ONAN / ONAF / OFAF |
| Transformer Capacity | 50 kVA – 500 MVA |
| Voltage Class | 10kV – 500kV |
| Radiator Material | High Quality Carbon Steel |
| Steel Thickness | 1.2 / 1.5 / 2.0 / 2.5 mm |
| Header Thickness | 3–6 mm |
| Panel Width | 120 / 140 / 160 / 180 mm (Customized) |
| Radiator Height | 500–3500 mm |
| Center Distance | 300–3500 mm |
| Panel Quantity | 5–36 Panels |
| Connection Type | Flange / Welding Connection |
| Oil Medium | Mineral Oil / Ester Oil |
| Working Pressure | ≤0.6 MPa |
| Test Pressure | 0.8 MPa Hydraulic Test |
| Leakage Test | 100% Factory Pressure Test |
| Surface Treatment | Shot Blasting + Painting |
| Coating Thickness | 80–240 μm |
| Corrosion Grade | C3 / C4 / C5-I / C5-M |
| Operating Temperature | -45℃ to +120℃ |
| Ambient Temperature | -40℃ to +60℃ |
| Manufacturing Standard | IEC 60076 |
| OEM Customization | Available |
Choosing the correct transformer radiator is important for transformer safety and service life. Customers should consider the following factors:
The radiator size depends directly on transformer heat generation.
Recommended selection:
| Transformer Capacity | Recommended Radiator Type |
|---|---|
| 50–630 kVA | Small panel radiator |
| 630–2500 kVA | Medium panel radiator |
| 3–10 MVA | Multi-panel radiator |
| 10–40 MVA | Large panel or ONAF radiator |
| Above 40 MVA | Customized cooling system |
Purchase advice:
Do not select radiator size only according to transformer appearance. The required cooling area should be calculated according to transformer losses and temperature rise requirements.
| Cooling Type | Application |
|---|---|
| ONAN | Natural oil circulation + natural air cooling |
| ONAF | Natural oil circulation + forced air cooling |
| OFAF | Forced oil circulation + forced air cooling |
Purchase advice:
For standard distribution transformers, ONAN radiators are usually sufficient.
For high-load or large-capacity transformers, ONAF cooling provides better thermal performance.
The operating environment directly affects radiator lifetime.
| Environment | Recommended Protection |
|---|---|
| Indoor / Normal Environment | C3 |
| Industrial Area | C4 |
| Coastal Area | C4–C5-I |
| Marine / Offshore | C5-M |
| Desert High Temperature Area | C4 + UV Resistant Coating |
Purchase advice:
For Middle East markets such as Saudi Arabia, UAE, Qatar, and Oman, customers should consider C4 or C5 anti-corrosion coating due to high temperature, dust, and coastal conditions.
Important dimensions include:
Purchase advice:
Providing transformer drawings or existing radiator dimensions can significantly reduce installation problems.
Radiastar can customize:
Every radiator undergoes:
✔ Raw material inspection
✔ Automatic welding inspection
✔ Dimension verification
✔ Hydraulic pressure test
✔ Oil leakage test
✔ Coating thickness inspection
✔ Final quality inspection
Oil immersed transformer radiators are widely used in:
✔ Professional transformer radiator manufacturer
✔ Factory-direct supply
✔ Customized OEM production
✔ IEC standard manufacturing
✔ Reliable anti-corrosion solutions
✔ Competitive export pricing
✔ Global project experience
To recommend the correct radiator model, please provide:
Radiastar will provide a suitable cooling solution and factory quotation according to your transformer requirements.
