Transformer Cooling Fan for Generator Set — Manufacturer & Supplier
Vayuvents Pvt. Ltd. manufactures and supplies transformer cooling fans for generator set applications across India and export markets.
Generator sets powering standby and prime power applications often include a step-up or step-down transformer that requires ONAF cooling fans to operate at rated capacity — particularly important in standby power applications where the generator must supply full rated load immediately on mains failure.
Generator step-up transformers, AVR (Automatic Voltage Regulator) transformers, and generator auxiliary transformers are typically installed in the generator room or outdoor canopy — environments that may reach high ambient temperatures affecting transformer cooling performance.
Vayuvents supplies compact, space-efficient transformer cooling fans matched to the specific transformer radiator configuration in generator room and outdoor canopy installations across commercial buildings, hospitals, data centres, and industrial sites.
How It Works in This Application
Generator Load Application
On mains failure, the generator immediately picks up full facility load — the transformer must handle full rated current from cold start, requiring ONAF fans to prevent overheating.
High Ambient Temperature
Generator rooms and outdoor canopies can reach 45 to 55 degrees Celsius — requiring ONAF fans to maintain transformer winding temperature within rated limits at these high ambient conditions.
Fan Activation on Generator Start
Transformer cooling fans activate automatically on generator start signal — ensuring cooling is available from the first moment the generator supplies load.
Normal Standby Mode
During standby mode with generator not running, transformer cooling fans are de-energised — activating only when the generator is called to supply power.
Recommended Variants
Compact Radiator-Mount Fan
Space-efficient compact fan for generator room transformer radiator banks where space is limited.
Most RecommendedGenerator-Start Interlocked Fan
Fan control panel wired to generator start signal — fans activate automatically when generator starts.
High-Ambient Rated Fan
Class F motor insulation for outdoor generator canopy installations with high summer ambient temperatures.
Weatherproof Outdoor Fan
IP65 rated fan for outdoor generator canopy and open transformer room installations.
Technical Specifications
| Parameter | Specification |
|---|---|
| Airflow Capacity | 500 to 20,000 m3/hr per fan |
| Motor Power | 0.04 kW to 2.2 kW |
| 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 in all weather conditions
- Low-noise operation essential for transformer substations in residential and commercial areas
- Aluminium and PP blades are lightweight and non-sparking 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 factory-sealed bearings require no periodic lubrication for maintenance-free operation
- Works performance test certificate with measured airflow and motor power data
Industries That Use This Application
Hospital Generator Transformers
Step-up transformers for hospital emergency generator sets supplying critical care and life safety systems
Commercial Building Generators
Generator room step-down transformers for large commercial building standby power systems
Data Centre Generator Sets
Generator transformer cooling fans for data centre standby power generator sets up to 3 MW
Industrial Standby Power
Generator set transformers for critical process standby power in pharmaceutical, chemical, and semiconductor plants
Construction Site Generators
Temporary power generator transformer cooling fans for large construction project sites
Retail & Shopping Centres
Generator transformer cooling fans for shopping centre standby power ensuring refrigeration and HVAC continuity
Hybrid Solar-DG Systems
Transformer cooling fans for solar-DG hybrid system step-up and inverter transformers
Telecom Tower Generators
Compact transformer cooling fans for telecom tower DG sets and battery charging systems
✓ Supply & Support: Vayuvents manufactures generator set transformer cooling fans at our Vasai, Mumbai works. We supply to generator set manufacturers, EPC contractors, and facility managers across India. Compact configurations for generator room installation are available from stock.
FAQs
Generator step-up transformers handle the full generator rated output immediately on load application — often from cold start conditions. Without ONAF fans, the transformer must be thermally derated for the high ambient temperatures common in generator rooms and outdoor canopies. ONAF fans allow the transformer to handle full generator rated output in all ambient conditions.
Yes. Generator set transformer cooling fans should be wired to activate on the generator start signal — ensuring cooling is available from the moment the generator comes on load. If fans activate only on transformer temperature rise (OTI signal), there may be a delay before cooling starts that allows initial temperature overshoot on heavy load application. Vayuvents can supply fans with control panels wired for generator-start interlock.
Generator rooms are typically designed to minimum dimensions, leaving limited space around the transformer. Vayuvents supplies compact transformer cooling fans with minimal frame projection beyond the radiator bank face, allowing installation in congested generator room layouts. We can provide mounting arrangement drawings before supply to confirm fit in your specific generator room layout.
Yes. For outdoor generator canopy transformer installations, Vayuvents supplies fans with IP55 or IP65 weatherproof motor enclosures, Class F motor insulation for high ambient temperature, and marine-grade paint finish for coastal outdoor environments. All exterior-mounted fans are supplied with weatherproof terminal boxes.
Generator transformer cooling fans are typically powered from the generator's 415V auxiliary bus — ensuring they operate whenever the generator is running. A separate circuit breaker protects the fan supply. For redundancy, cooling fans can be powered from both the generator auxiliary bus and the mains supply so they operate on either source.
Generator room transformer cooling fans should be inspected during the monthly generator load test — checking for correct rotation, noise, and airflow. Annual inspection should include motor bearing check, terminal tightening, and fan impeller cleaning. Vayuvents fans with factory-sealed bearings require no bearing maintenance during the first 5 years of normal operation.
Contact Vayuvents at enquiry@vayuvents.com or call +91 90961 88703. Share the generator set kVA rating, transformer MVA, fan dimensions and quantity, and generator room or canopy ambient temperature. We will provide a compact fan selection and commercial proposal within 24 hours.
