Air-cooled Oil Cooler For Transformers

Air-cooled oil cooler for transformers

Transformer air-cooled oil cooler is a key heat dissipation equipment to take away the heat of transformer oil through air flow, widely used in small and medium-sized transformers and the need to simplify the cooling system. Its core role is to maintain the normal working temperature of transformer oil (usually not more than 65-80 ℃), to protect the insulation performance of the winding and core and equipment life.

Basic structure

Heat exchanger core: consists of several sets of heat dissipation tubes with fins. Transformer oil flows through the internal pipeline, and the fins increase the contact area with the air to enhance the heat exchange efficiency.

Fan components: including axial fan or centrifugal fan, used to force the driving air flow through the surface of the fins to accelerate the heat transfer.

Oil circuit system: consists of oil inlet pipe, oil outlet pipe, valves, etc., to realize the circulation of transformer oil between the cooler and the transformer body (usually cooperating with the oil pump of the transformer to form oil circuit circulation).

Frame and protective parts: support the overall structure, some models are equipped with protective cover to prevent debris from entering or reduce noise.

Workflow

When the transformer is running, the heat generated by the windings and the iron core is transferred to the transformer oil, and the hot oil is sent through the oil pump into the cooling tube of the air-cooled oil cooler.

After the fan is started, the air is forced to flow horizontally or vertically through the fins outside the cooling tube to form air convection.

Heat is transferred from the hot oil to the air through the tube wall and fins, and the cooled oil flows back to the transformer oil tank to complete the heat dissipation cycle.

Application

Small and medium-sized transformers: such as distribution transformers (capacity usually in 630-5000kVA), dry-type transformers auxiliary cooling (some dry-type transformers will be equipped with air-cooling system to enhance heat dissipation).

Outdoor or open space: such as outdoor substation, wind power tower inside the transformer (the use of natural wind auxiliary cooling, reduce wind turbine energy consumption).

Mobile equipment: such as vehicle-mounted transformers, emergency power generator matching transformers, need to simplify the system to adapt to the mobile scene.