Transformer Radiator Panel Manufacturer | Complete Guide to Oil Transformer Cooling Systems

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Updated: Jul 18, 2026
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Transformer Radiator Panel Manufacturer

Transformer Radiator Panel Manufacturer for Oil Immersed Transformer Cooling Systems

Radiastar is a professional Transformer Radiator Panel Manufacturer specializing in the design, manufacturing, and supply of high-quality transformer cooling components for global transformer manufacturers, utilities, EPC contractors, and electrical equipment distributors.

A Transformer Radiator Panel is one of the most important cooling components installed on oil immersed transformers. It transfers heat generated inside the transformer to the surrounding environment through transformer oil circulation and natural air cooling.

With the increasing demand for reliable power transmission and renewable energy infrastructure, efficient transformer cooling systems have become essential for improving transformer performance, reducing operating temperature, and extending transformer service life.

Radiastar provides customized Transformer Radiator Panels, including corrugated radiator panels, detachable radiator banks, and cooling elements for distribution transformers, power transformers, and industrial transformers.

What Is a Transformer Radiator Panel?

A Transformer Radiator Panel, also known as a Transformer Cooling Radiator, is an external heat dissipation device connected to an oil immersed transformer tank.

During transformer operation, electrical energy losses generate heat from:

  • Transformer core loss
  • Copper winding loss
  • Stray losses
  • Load-related losses

The transformer oil absorbs this heat and circulates between the transformer tank and radiator panels.

Inside the radiator panel:

  1. Hot transformer oil flows from the transformer tank into the radiator.
  2. Heat transfers through the steel radiator surface.
  3. Ambient air removes the heat from the radiator surface.
  4. Cooled oil returns back to the transformer tank.

This continuous circulation maintains the transformer temperature within a safe operating range.

How Does a Transformer Radiator Panel Work?

The working principle of a transformer radiator is based on heat transfer and natural oil circulation.

Natural Cooling System (ONAN)

Most distribution transformers use:

ONAN Cooling

(Oil Natural Air Natural)

The cooling process:

Transformer Windings
        ↓
Hot Transformer Oil
        ↓
Radiator Panel
        ↓
Heat Released to Air
        ↓
Cool Oil Returns
        ↓
Transformer Tank

Advantages:

  • Simple structure
  • No additional power consumption
  • High reliability
  • Low maintenance requirement

Forced Cooling System (ONAF)

Large power transformers may use:

ONAF Cooling

(Oil Natural Air Forced)

Cooling fans are installed on radiator panels to increase airflow and improve heat dissipation.

Advantages:

  • Higher cooling capacity
  • Suitable for large transformers
  • Supports higher loading conditions

Applications:

  • Power substations
  • Grid transformers
  • Renewable energy transformers

Types of Transformer Radiator Panels

Radiator design depends on transformer capacity, voltage level, cooling requirements, and installation conditions.

1. Corrugated Transformer Radiator Panel

A Corrugated Transformer Radiator Panel is one of the most widely used cooling solutions for oil immersed distribution transformers.

Features:

  • Large heat dissipation area
  • Compact structure
  • Lightweight design
  • High mechanical strength
  • Excellent oil circulation performance

Applications:

  • 10kV distribution transformers
  • 20kV transformers
  • 35kV transformers

2. Flat Panel Transformer Radiator

Flat panel radiators consist of multiple steel plates welded together.

Advantages:

  • Strong structure
  • Suitable for large transformers
  • Easy installation

Common applications:

  • Industrial transformers
  • Power transformers
  • Substation transformers

3. Detachable Transformer Radiator Bank

Detachable radiator banks allow easier transportation and maintenance.

Advantages:

  • Easy replacement
  • Flexible installation
  • Suitable for large transformer projects

Used in:

  • 66kV transformers
  • 110kV transformers
  • 220kV transformers

4. Fan Cooling Transformer Radiator

For high-capacity transformers, radiator panels can be equipped with cooling fans.

Features:

  • Increased airflow
  • Higher cooling efficiency
  • Suitable for heavy load operation

Transformer Radiator Panel Manufacturing Process

As an experienced Transformer Radiator Manufacturer, Radiastar follows strict manufacturing procedures to ensure product reliability.

Step 1: Engineering Design

Each radiator panel is designed according to:

  • Transformer capacity
  • Heat dissipation requirements
  • Oil volume
  • Customer drawings
  • Installation dimensions

Engineering parameters include:

  • Radiator width
  • Number of fins
  • Oil flow channel design
  • Connection flange size

Step 2: Steel Material Preparation

High-quality steel sheets are selected for radiator manufacturing.

Material requirements:

  • Good welding performance
  • High mechanical strength
  • Corrosion resistance
  • Long outdoor service life

Step 3: Forming and Welding

The radiator panel is manufactured through:

  • Steel sheet forming
  • Corrugation processing
  • Automatic welding
  • Flange assembly

Professional welding technology ensures:

  • Oil leakage prevention
  • Structural strength
  • Long-term operation reliability

Step 4: Leakage Testing

Every radiator panel undergoes strict testing.

Testing includes:

  • Air pressure testing
  • Oil leakage testing
  • Welding inspection
  • Dimension inspection

This ensures reliable performance under transformer operating conditions.

Step 5: Surface Treatment

To protect radiator panels from outdoor corrosion:

Surface treatment includes:

  1. Sand blasting
  2. Anti-corrosion primer
  3. Intermediate coating
  4. Final painting

The coating system can be customized according to:

  • Climate conditions
  • Coastal environments
  • Industrial environments

Technical Specifications of Transformer Radiator Panel

ParameterSpecification
Product NameTransformer Radiator Panel
ApplicationOil Immersed Transformer
MaterialCarbon Steel
Cooling TypeONAN / ONAF
Voltage Range10kV – 220kV
Transformer CapacityCustomized
InstallationOutdoor
StructureCorrugated / Panel Type
Surface TreatmentAnti-corrosion Coating
Testing StandardIEC 60076

Applications of Transformer Radiator Panels

Radiastar transformer radiator panels are widely used in different power applications.

Distribution Transformers

Typical applications:

  • Residential power supply
  • Commercial buildings
  • Industrial facilities

Voltage levels:

  • 10kV
  • 11kV
  • 20kV
  • 35kV

Power Transformers

Large transformer cooling applications:

  • 66kV transformers
  • 110kV transformers
  • 220kV transformers

Renewable Energy Transformers

Transformer radiator panels are widely applied in:

  • Solar power plants
  • Wind power projects
  • Energy storage systems

Renewable projects require reliable transformer cooling because transformers often operate continuously under high loads.

Industrial Transformers

Applications include:

  • Mining plants
  • Steel factories
  • Chemical industries
  • Manufacturing facilities

Why Choose Radiastar Transformer Radiator Panel?

Professional Transformer Cooling Component Manufacturer

Radiastar focuses on transformer components manufacturing, including:

  • Transformer Radiator Panels
  • Corrugated Transformer Radiators
  • Transformer Conservator Tanks
  • Transformer Oil Tanks
  • Transformer Accessories

Our products are supplied to transformer manufacturers and electrical companies worldwide.

Customized OEM Manufacturing

Radiastar provides customized solutions based on customer requirements.

Customization includes:

  • Product dimensions
  • Cooling capacity
  • Connection flange design
  • Painting requirements
  • Transformer drawings

OEM manufacturing is available for:

  • Transformer manufacturers
  • Engineering companies
  • Power utilities

Strict Quality Control

Each transformer radiator panel is inspected through:

Raw Material Inspection

Ensure:

  • Steel quality
  • Thickness accuracy
  • Material compliance

Welding Inspection

Check:

  • Welding strength
  • Oil tightness
  • Structural reliability

Final Testing

Including:

  • Leakage test
  • Pressure test
  • Appearance inspection
  • Dimension inspection

How to Select a Reliable Transformer Radiator Panel Supplier?

When choosing a Transformer Radiator Panel Supplier, consider the following factors:

1. Manufacturing Capability

A professional manufacturer should have:

  • Production equipment
  • Welding technology
  • Quality inspection system

2. Transformer Industry Experience

Transformer components require technical knowledge.

A qualified supplier should understand:

  • Transformer cooling requirements
  • Oil circulation principles
  • IEC standards

3. Customization Ability

Different transformers require different radiator designs.

A capable supplier should support:

  • OEM production
  • Drawing-based manufacturing
  • Customized solutions

4. Export Experience

International suppliers should provide:

  • Export packaging
  • Technical documents
  • Global logistics support

Transformer Radiator Panel FAQ

What is a transformer radiator panel?

A transformer radiator panel is a cooling component installed on oil immersed transformers to dissipate heat generated during transformer operation.

What is the difference between transformer radiator and radiator panel?

A transformer radiator refers to the complete cooling device, while radiator panel usually refers to individual cooling elements or panels forming the radiator system.

Which transformers need radiator panels?

Radiator panels are mainly used for:

  • Oil immersed distribution transformers
  • Power transformers
  • Substation transformers
  • Industrial transformers

Dry type transformers usually do not require radiator panels.

How long does a transformer radiator panel last?

With proper manufacturing and anti-corrosion treatment, transformer radiator panels can operate reliably for decades.

Can Radiastar manufacture customized transformer radiator panels?

Yes. Radiastar provides customized transformer radiator panels according to:

  • Transformer specifications
  • Customer drawings
  • Voltage level
  • Cooling requirements

Related Products

Explore Radiastar transformer components:

  • Transformer Conservator Tank
  • Corrugated Transformer Tank
  • Transformer Oil Tank
  • Oil Immersed Transformer Components
  • Transformer Accessories

Get Factory Price from Transformer Radiator Panel Manufacturer

Looking for a reliable Transformer Radiator Panel Manufacturer?

Radiastar provides:

✔ Factory direct transformer radiator panels
✔ Customized OEM production
✔ Professional transformer cooling solutions
✔ Global export support

Send your transformer specifications or drawings today to receive a customized quotation.

Contact Radiastar for your transformer radiator panel solution.

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