Transformer Oil Water Cooler

Transformer Oil Water Cooler for Power Transformers

Avantar's Transformer Oil Water Cooler is a water-cooled thermal management device for oil-immersed power transformers. It uses hot insulating oil flowing through an internal flow path, and thermally transfers the heat to a loop of circulating water to maintain oil temperatures in safe working ranges. Units are available in steel, copper or stainless steel and are designed for situations where air-cooled radiators are unfeasible due to space or environmental constraints. Each unit adheres to ISO 9001, IEC 60076 and CE standards. Customisable cooling capacity, flow rate and connector dimensions to match your transformer specs.

What Is a Transformer Oil Water Cooler?

The product is put in the cooling circuit of oil-immersed power transformers. Hot transformer oil flows through an internal flow path . Heat is transferred across the wall to cooling water flowing on the opposite side . The oil does not come in contact with water at any time and the transformer is cooled by the lower temperature oil.

This makes it useful for substations, data centers, industrial facilities and closed or underground locations where air cooling is not feasible, as it does away with the requirement for big external air radiators. Its small footprint fits into narrow places without sacrificing thermal performance.

Key Features

Water-based cooling without outside air radiators

The heat transfer from the oil circuit is straight to a closed water circuit without the necessity of additional fins or forced air fans. Ideal for closed or underground locations where large exterior equipment is not an option.

Oil temperature stabilization during continuous operation

Transformer insulation integrity is maintained with oil temperature kept within rated limits and reduced danger of thermal deterioration throughout its service life.

Optimised inner flow channel

The design of the flow path enhances the contact surface area between oil and water, boosting the heat transfer efficiency at moderate flow rates.

Mounting choices that are flexible

Floor mounted and bracket mounted arrangements can be provided to suit various site layouts.

Typical Applications

• Oil-immersed distribution and transmission power transformers
• Industrial rectifier equipment and large power supply systems
• Substation cooling rooms
• Heavy-duty electrical installations
• Water-cooled transformer systems in renewable energy projects

This type of cooling is most cost-effective on sites where a circulating water infrastructure is already in place.

Technical Specifications

Custom Configuration

Each transformer project carries different thermal loads, flow rates, and site constraints. Avantar produces to project-specific requirements rather than fixed catalog units.

What can be adjusted:

• Cooling capacity — sized to your transformer's heat dissipation requirement
• Flow rate — oil-side and water-side specified independently
• Connection size and type — flange or threaded in various standard sizes
• Material — carbon steel as standard; copper for higher thermal conductivity; stainless steel for corrosive environments
• Mounting form — floor-mounted or bracket-mounted

To begin, share your transformer technical data, circulating water conditions, and available installation dimensions for the Transformer Oil Water Cooler. The engineering team produces fabrication drawings for your review before production starts.

How to Order?

Confirm the following inputs before placing an order:

1. Required cooling capacity (kW or equivalent heat load)
2. Oil-side flow rate (L/min or m³/h)
3. Water-side flow rate and inlet temperature
4. Connection preference — flange or threaded
5. Material requirement — steel, copper, or stainless steel
6. Installation form — floor-mounted or bracket-mounted
7. Any dimensional constraints at the installation site

Once confirmed, fabrication drawings are issued for your approval. Every shipment includes a certificate of origin, material certificates, and pressure-test reports.

Quality and Certifications

Units meet ISO 9001, IEC 60076 and CE standards. Each unit is pressure tested and surface processed at Avantar's Guangdong manufacturing facility, before shipping.

Quality verification alternatives include study of design drawings and thermal calculation datasheets, evaluation of material certificates and pressure-test records, request for a finished-goods video inspection or arrangement of a third-party witness inspection for major substation tender projects.

FAQ

Q: When would it make more sense to use an oil-to-water heat exchanger instead of an air-cooled radiator?

A: It works better when there isn't much room for installation, when the site is enclosed or underground, or when there is already a system for circulating water. Air radiators need a clear area outside and enough airflow, but water-cooled units don't have to worry about those things.

Q: Does Avantar make things or do they just sell them?

A: Avantar is a direct manufacturer. People who work at the Guangdong plant put things together, weld them, test them for pressure resistance, and finish the surfaces. This means that the technical alignment can happen right during the stage of confirming the drawing, without any breaks.

Q: What do I need to know in order to get ready for a big sale?

A: How much cooling do you need? How fast do you want the oil and water to flow? What kind of connection do you want? What kind of material do you want? How do you want to put it? With the technical data from the transformer and the measurements of the site, the engineering team can finish the fabrication plans before the production starts.

Q: How many pieces of paper do you think come with each shipment?

A: Each unit has a pressure test record, a certificate of origin, and proof that it is made of the right stuff. You can ask a third party to check things out for big substation projects.

Q: What is the smallest order size, how long does it take to get my order, and how is it packed?

A: You need to order at least one of each type. There will be a 15- to 30-day lead time after the drawing is approved. The units are put on pallets or wooden crates that keep shock and moisture out. We can help with both sea freight and land transport, and we provide all the export paperwork needed to clear customs and put in bids.

Q: Can the size and type of the connection be changed for this project?

A: Yes. This item can be made of steel, copper, or stainless steel. The flow rate, cooling capacity, and connection type (flanged or threaded) can all be changed. So that they can make sure they have everything they need, tell the engineering team about your idea.

Contact Us

For project inquiries or a custom quotation for a Transformer Oil Water Cooler, email [email protected]. Please include your transformer specifications and site conditions to receive an accurate response.