Axial Flow Fan for Transformer & Generator Cooling — Manufacturer & Supplier
Vayuvents Pvt. Ltd. manufactures and supplies compact axial flow fans for forced-air cooling of power transformers, generators, large motors, rectifiers, and electrical switchgear in industrial and utility applications.
Power transformers and large generators generate significant heat during operation. For ONAF-rated transformers, forced air cooling by fans mounted on radiator banks is required to keep winding temperatures within safe limits at full rated capacity — particularly important at 45 to 50 degrees Celsius ambient temperature common in Indian outdoor substation environments.
Axial flow fans mounted on transformer radiator banks create forced airflow that enhances convective heat transfer from hot oil-filled radiators, allowing the transformer to operate at full rated capacity in high ambient temperature conditions.
Vayuvents supplies transformer cooling fans in standard frame sizes to match major transformer OEM and utility specifications. We also supply fans for generator canopy cooling, motor frame cooling, and electrical panel ventilation.
How It Works in This Application
Heat Generation in Windings
Electrical losses in the transformer core and windings heat the insulating oil circulating inside the transformer tank.
Hot Oil to Radiators
Hot insulating oil circulates to external finned radiator banks mounted on the transformer body.
Forced Air Over Radiators
Axial fans mounted below or beside the radiator banks force ambient air through the radiator fins, dramatically increasing convective heat transfer from hot oil to air.
Cooled Oil Returns to Tank
Oil cooled in the radiators returns to the transformer tank to absorb more heat — the cycle maintains winding temperature within the rated limit.
Recommended Variants
Transformer Radiator Cooling Fan
Compact direct-drive axial fan in standard frame sizes for mounting on transformer radiator banks.
Most RecommendedGenerator Canopy Cooling Fan
Axial fans for forced ventilation of generator set enclosures, exhausting engine heat from the canopy.
Motor Frame Cooling Fan
Replacement or supplemental cooling fans for large induction motor frames where standard shaft-mounted fan is insufficient.
Panel Ventilation Fan
Small axial fans for electrical panel and switchgear cubicle ventilation to prevent component overheating.
Technical Specifications
| Parameter | Specification |
|---|---|
| Airflow Capacity | 500 to 20,000 m3/hr |
| Motor Power | 0.04 to 2.2 kW for transformer fans |
| Fan Diameter | 200 to 800 mm |
| Voltage | 415V / 230V 3-phase and single-phase |
| Motor Enclosure | TEFC IP55 as standard |
| Blade Material | Aluminium / PP |
| Standards | IS 4894, IEC 60076 |
Key Features
- Compact direct-drive design with motor integrated in fan hub fits standard transformer radiator mounting brackets
- IP55 TEFC motor as standard for outdoor substation and industrial installation
- Low-noise operation essential for transformer substations in residential and commercial areas
- Aluminium and plastic blades are non-sparking and lightweight for safe electrical equipment mounting
- Thermal protector built into motor winding protects against overheating if airflow is obstructed
- Available in 415V 3-phase and 230V single-phase for compatibility with transformer auxiliary supplies
- Long-life sealed bearings require no periodic lubrication for maintenance-free operation
- Corrosion-resistant epoxy coated or stainless housing for coastal and industrial environments
Industries That Use This Application
Power Utilities
Distribution transformers and power transformers in substations and transmission networks
Industrial Plants
In-plant transformers for large manufacturing facilities, steel plants, and mines
Data Centres
UPS transformers and rectifiers requiring forced cooling for continuous operation
Construction
Portable generator sets and site transformers on large construction projects
Pharmaceuticals
Critical power transformers in pharmaceutical plants requiring high-reliability cooling
Railways
Traction transformers and locomotive power supply equipment cooling
Oil & Gas
Offshore and onshore transformer cooling in upstream and downstream facilities
Commercial Buildings
Building substation transformers in high-rise commercial and residential buildings
✓ Supply & Support: Vayuvents manufactures transformer and generator cooling axial fans at our Vasai, Mumbai works. We supply in standard and custom frame sizes to match specific transformer OEM specifications. Export supply to UAE, Saudi Arabia, Qatar, and Oman.
FAQs
ONAF stands for Oil Natural Air Forced — a transformer cooling class where ambient air cooling of the radiators is enhanced by forced-air fans. ONAF fans allow a transformer to operate at higher capacity — for example upgrading from 100 MVA ONAN to 133 MVA ONAF by adding cooling fans, a cost-effective capacity increase without transformer replacement.
The number depends on transformer rating and radiator bank configuration. A 5 MVA distribution transformer may require 2 to 4 fans, while a 100 MVA power transformer may require 20 to 40 fans across multiple radiator banks. Vayuvents supplies fans in matched sets per specification.
Transformer cooling fans typically operate from the transformer auxiliary supply — most commonly 415V 3-phase for larger fans and 230V single-phase for smaller units.
Yes. Transformer cooling fans are typically controlled by a thermostat wired to the transformer oil temperature indicator or winding temperature indicator. Fans activate automatically when temperature reaches the set point.
With proper IP55 motor enclosure and sealed bearings, Vayuvents transformer cooling fans are designed for 10 to 15 years of continuous service in normal industrial environments.
Yes. Send us the fan diameter, frame dimensions, mounting hole pattern, voltage, and airflow requirement and we will supply a matched replacement.
Contact Vayuvents at enquiry@vayuvents.com or call +91 90961 88703. Share the transformer rating, required airflow per fan, fan diameter, voltage, and quantity. We will provide a proposal within 24 hours.
