Air Coolers on The Transformer Tank

Air coolers on the transformer tank

Physical connection method: The cooler is directly secured to the side or top wall of the transformer tank via bolts or welding. Its heat exchange surface closely adheres to the tank wall (with thermal grease applied in some areas to enhance heat transfer), forming an integrated “tank-cooler” heat dissipation structure.

Heat Transfer Path: During transformer operation, heat generated by the core and windings is first transferred to the surrounding transformer oil, raising its temperature. The heated oil then contacts the tank wall, transferring heat via conduction to the adjacent air cooler. Fans within the cooler circulate air, dissipating the heat into the atmosphere to complete the cooling cycle.

Suitable Application Requirements: This installation method eliminates the need for complex external oil lines and features a compact structure. It is therefore more suitable for oil-immersed transformers with limited installation space and capacities ranging from 10 to 100 MVA, such as distribution transformers and small power transformers.

Core Features

High Cooling Efficiency: Direct contact between the cooler and oil tank eliminates the “oil-piping-cooler” intermediate steps, minimizing heat transfer losses and accelerating cooling speed.

Simple and Reliable Structure: Reduced external components like oil pipes and valves decrease potential failure points. Maintenance involves only cleaning cooler fins and inspecting fans, ensuring straightforward operation.

Significant Environmental Impact: Since the cooler is exposed outdoors (or in transformer rooms), cooling efficiency may decrease under high ambient temperatures (e.g., summer) or dusty conditions. Regular cleaning of dust or debris from the fins is required.