Transformer Cooling Fan for Industrial Plant — Manufacturer & Supplier
Vayuvents Pvt. Ltd. manufactures and supplies transformer cooling fans for industrial plant applications across India and export markets.
Large manufacturing facilities operate their own in-plant substations with HV/MV transformers powering process machinery, drives, and utility systems. These transformers must supply peak load reliably and ONAF cooling fans are essential for full-rated capacity operation in hot Indian plant environments.
In-plant transformers differ from grid transformers in that they experience rapid load fluctuations as large motors start and stop — creating thermal cycling stress that requires reliable cooling fan operation to maintain winding temperatures within safe limits at all load levels.
Vayuvents supplies transformer cooling fans for in-plant transformers across all major Indian manufacturing industries — from the 400kV step-down transformers at steel plant main receiving substations to small 1 MVA plant transformers in pharmaceutical manufacturing buildings.
How It Works in This Application
Heavy Load Fluctuations
Manufacturing plant transformers experience large, rapid load changes as motors start and stop — creating thermal stress that drives the need for forced-air cooling.
High Ambient Temperatures
Industrial plant environments with process heat can have ambient temperatures near in-plant transformers of 35 to 45 degrees Celsius — requiring ONAF fans to maintain safe winding temperatures.
Forced Air Cooling Activation
Transformer cooling fans activate when winding temperature indicator reaches the Stage 1 setpoint, providing forced-air cooling to bring winding temperature back within rated limits.
Reliable Operation Assurance
Properly sized and maintained ONAF fans ensure the transformer can supply peak plant demand without thermal overload tripping — preventing costly production interruptions.
Recommended Variants
Standard Radiator-Mount Fan
Direct radiator bank channel mount — most common in-plant transformer configuration.
Most RecommendedWTI-Controlled Fan Set
Fans with integrated WTI thermostat control for automatic start-stop based on winding temperature.
High-Ambient Rated Fan
Class F motor insulation for in-plant transformers near furnaces or process heat sources where ambient exceeds 45 degrees Celsius.
Dust-Protected Fan
Fan with enhanced IP55 protection for dusty plant environments (cement, steel, chemical).
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
Steel Plants
Main receiving substation, arc furnace transformers, and rolling mill drive transformers
Cement Plants
Plant main receiving transformer, kiln drive transformer, and auxiliary plant transformers
Pharmaceuticals
Plant substation transformers in pharmaceutical manufacturing and API plant facilities
Chemical Plants
Process plant transformers including large motor drive transformers and utility supply transformers
EV & Battery Plants
Main plant transformers in new EV gigafactory and battery manufacturing facilities
Textile Mills
Plant supply transformers in large spinning, weaving, and processing mill complexes
Construction Equipment
Precast concrete and construction material plant transformers in manufacturing facilities
Logistics & Warehousing
Large logistics park substation transformers with refrigeration and conveyor system loads
✓ Supply & Support: Vayuvents manufactures in-plant transformer cooling fans at our Vasai, Mumbai works. We supply to plant engineering and electrical departments across all major Indian industries. We match existing radiator channel dimensions for retrofit and replacement supply.
FAQs
In-plant transformers experience higher peak loads from motor starting and process surges than grid supply transformers. Without ONAF fans, the transformer must be derated to prevent overheating during peak demand — limiting plant production capacity. ONAF fans allow the transformer to supply 25 to 33 percent more load than its ONAN rating, maximizing utilization of the existing transformer investment.
Yes. ONAF fan retrofitting is a standard and cost-effective way to increase an existing transformer's capacity without replacement. Vayuvents supplies ONAF fan sets matched to the existing transformer's radiator bank channel dimensions. The transformer manufacturer's nameplate typically shows both the ONAN and ONAF capacity ratings — confirming that the transformer is designed to accept ONAF upgrading.
If ONAF fans fail, the transformer reverts to ONAN (natural cooling) operation and must be loaded only to its lower ONAN rated capacity. If the plant load exceeds ONAN capacity, the transformer winding temperature rises progressively until the WTI alarm and trip protect the transformer by disconnecting supply. A fan failure during peak production can cause production stoppage. Vayuvents recommends keeping spare fans in stock for critical plant transformers.
IP55 motor enclosures prevent dust from entering motor windings. In very dusty environments (cement, steel), more frequent motor inspection and cleaning is recommended. Vayuvents can supply fans with IP55 plus additional gasket sealing for high-dust environments on request.
Yes. Vayuvents transformer cooling fans are supplied with IP55 weatherproof enclosures and anti-corrosion paint suitable for outdoor installation in industrial plant environments. For coastal or highly corrosive plant environments, additional anti-corrosion treatment or stainless steel hardware is available.
Yes. Vayuvents is a known supplier of replacement transformer cooling fans for running plant maintenance programmes. Send us the existing fan dimensions and motor rating and we will supply matched replacements with short lead times.
Contact Vayuvents at enquiry@vayuvents.com or call +91 90961 88703. Share the transformer MVA rating, fan diameter, frame dimensions, voltage, and quantity required. We will provide a matched fan selection and commercial proposal within 24 hours.
