Distribution transformer radiators
Compact, lightweight radiator fins for 11kV to 33kV distribution transformers. Built for high-volume transformer manufacturers supplying DISCOMs, rural electrification projects, and industrial installations.
Radiator types available
Straight type
The standard configuration for distribution transformers across India. Used in the vast majority of 11kV/33kV designs for DISCOM supply, rural electrification, and industrial distribution applications.
Swan neck type
Inlet manifold pipe curved upward to connect to an elevated tank port. Available for distribution transformer designs where the top oil inlet port is mounted higher than the standard fin centreline.
T-type radiators
The manifold pipe runs centrally with fins extending on both sides of the assembly. Used where the transformer tank design requires a wider cooling bank in a compact vertical space. Available across all standard fin lengths and panel counts.
Stainless steel radiators
All radiator types — straight, swan neck, and T-type — are available in stainless steel for coastal, chemical plant, or high-humidity environments. No painting required — natural corrosion resistance for the life of the transformer.
Key specifications
| Parameter | Value |
|---|---|
| Fin length | 650 mm to 2000 mm (typical for distribution) |
| Fin width | 380 mm standard |
| Material | Cold rolled steel (CRCA) standard · SS available |
| Sheet thickness | 1.0 mm + 1.0 mm |
| Manifold diameter | Φ89 mm |
| Fins per assembly | 5 to 20 fins (typical range) |
| Parameter | Value |
|---|---|
| Cooling class | ONAN (standard for distribution) |
| Standard compliance | IEC 60076 • IEEMA • EN 50216-6 |
| Test pressure | 0.15 - 0.4 MPa |
| Production output | Up to 75 fins/hour |
| Leakage test | 100% hydraulic, every assembly |
| Radiator types | Straight • Swan neck • T-Type • SS |
Surface finish & painting options
Primer only (no topcoat)
Shot blasted to SA 2.5, red oxide or epoxy primer applied. Standard dispatch condition for high-volume distribution transformer orders. OEM applies their own finish paint to match the transformer tank colour. Fastest turnaround time.
Primer + finish paint
Fully primed and finish-coated in a customer-specified RAL or IS colour. Suitable for replacement radiators or retrofit projects where on-site painting is not practical. Specify the colour code at order stage.
Hot dip galvanized
Full hot dip galvanizing post-fabrication, 85 µm zinc minimum. Recommended for distribution transformers installed in coastal Gujarat, Konkan, Kerala, or any high-humidity outdoor location. 25–40 years of corrosion protection without repainting.
Internal varnish coating
The internal surface of every radiator fin assembly can be coated with a phenol-based varnish on request. This provides protection against internal corrosion and contamination during extended storage or long-distance transportation before installation. Recommended for projects where radiators will be stored for more than 30 days before mounting, or for export shipments.
Why distribution transformer manufacturers choose Prima Transfab
High production rate
Automated line produces up to 75 fins per hour on a 2-metre length basis. Consistent supply for high-volume OEMs without delays in your production schedule.
Every fin pressure tested
No sampling. Every assembly is hydraulically tested before dispatch — critical assurance for DISCOM procurement and rural electrification projects.
Dimensional consistency
Servo-controlled cutting holds every fin to ±1 mm of your specified length. Faster assembly at your factory and zero rework on fit-up.
Compatible with leading Indian transformer manufacturers
Prima Transfab radiators are designed to standard IEC 60076 dimensions and are compatible with transformer designs from all major Indian manufacturers including Voltamp Transformers, Kirloskar Electric, Schneider Electric India, Crompton Greaves, Indo Tech Transformers, and all state-based transformer manufacturers. If you have an existing radiator drawing or dimension sheet, we can match it exactly.
Get pricing for distribution radiators
High-volume pricing available. Share your monthly or annual requirement for best rates.
