Corrugated Transformer Tank Manufacturer | Custom Oil Tank Supplier

Author: Radiastar
Updated: Jul 20, 2026
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S Series Oil Immersed Transformer Corrugated Tank Structure and Features

Corrugated Transformer Tank Design, Cooling Principle and Manufacturing Process

Introduction

The transformer tank is one of the most important components of an oil immersed transformer. It not only provides a sealed enclosure for transformer oil and internal active parts but also plays a critical role in heat dissipation and transformer reliability.

The corrugated transformer tank has become a widely used solution for modern distribution transformers due to its compact structure, excellent cooling performance, and integrated oil expansion compensation capability.

Compared with conventional flat wall transformer tanks, corrugated tanks use specially formed corrugated steel panels to increase heat dissipation area and absorb transformer oil volume changes caused by temperature fluctuations.

As a professional Corrugated Transformer Tank Manufacturer, Radiastar provides customized transformer oil tanks and transformer components for global transformer manufacturers, utilities, and industrial power projects.

What Is a Corrugated Transformer Tank?

A corrugated transformer tank is a sealed steel enclosure designed for oil immersed transformers. The tank body is manufactured with specially pressed corrugated walls, which provide two major functions:

  1. Heat dissipation
  2. Oil expansion compensation

The corrugated structure allows the tank wall to slightly expand and contract according to transformer oil temperature changes, reducing the need for additional expansion equipment.

Typical applications include:

  • Distribution transformers
  • Oil immersed power transformers
  • Renewable energy transformers
  • Industrial transformers
  • Outdoor electrical substations

Structure of S Series Corrugated Transformer Tank

The S Series oil immersed transformer corrugated tank mainly consists of:

  • Transformer tank body
  • Long corrugated panels
  • Short corrugated panels
  • Tank cover
  • Bottom structure
  • Connection flanges and accessories

The corrugated panels are manufactured through a dedicated corrugation forming line to ensure accurate dimensions and consistent quality.

During production, the long and short corrugated panels are precisely assembled and connected through gas shielded welding technology.

The short corrugated panels are designed with special right-angle edges. The long corrugated panels are inserted into these edge structures, creating a stable welding connection.

This structural design provides several advantages:

  • Easier welding operation
  • Higher welding strength
  • Reduced deformation during manufacturing
  • Lower risk of oil leakage

Working Principle of Corrugated Transformer Tank

A transformer corrugated tank is filled with insulating oil, which performs two essential functions:

  • Electrical insulation
  • Heat transfer medium

During transformer operation, losses generated by the core and windings produce heat.

The heat transfer process is:

Transformer Windings
          ↓
Hot Transformer Oil
          ↓
Corrugated Tank Wall
          ↓
Ambient Air

The transformer oil absorbs heat from internal components and transfers it to the corrugated tank wall. The heat is then released into the surrounding environment through natural air convection.

Oil Expansion Compensation in Corrugated Tanks

Transformer oil expands and contracts due to temperature variations during operation.

When transformer load increases:

  • Winding temperature rises
  • Oil temperature increases
  • Oil volume expands

The flexible corrugated walls deform slightly outward to accommodate the increased oil volume.

When the transformer cools down:

  • Oil volume decreases
  • Corrugated walls return to their original shape

This design helps maintain stable internal pressure and reduces the risk of moisture entering the transformer.

Compared with traditional transformer structures, corrugated tanks provide a more compact and maintenance-friendly solution.

Cooling Performance of Corrugated Transformer Tank

Cooling performance is one of the most important advantages of corrugated transformer tanks.

1. Increased Heat Dissipation Area

The corrugated structure significantly increases the external surface area compared with flat tank walls.

A larger cooling surface improves heat exchange efficiency between transformer oil and surrounding air.

2. Natural Oil Circulation

Transformer cooling depends on natural convection.

When oil temperature changes:

  • Hot oil rises upward
  • Cooler oil moves downward

This continuous circulation transfers heat away from the transformer windings.

The vertical corrugated panel design improves oil circulation and enhances cooling efficiency.

3. Compact Transformer Design

A corrugated transformer tank integrates:

  • Oil storage
  • Cooling surface
  • Expansion compensation

into one structure.

Benefits include:

  • Smaller installation footprint
  • Reduced transformer size
  • Easier transportation
  • Lower maintenance requirements

Advantages of Corrugated Transformer Tank

Excellent Cooling Performance

The increased surface area of corrugated panels improves heat dissipation and helps maintain stable transformer temperature.

Reduced Maintenance Requirements

The sealed structure reduces:

  • Moisture contamination
  • Oil oxidation
  • External air exposure

which helps extend transformer service life.

Compact and Attractive Design

Corrugated tanks provide:

  • Compact structure
  • Clean appearance
  • Space-saving installation

making them ideal for outdoor transformer applications.

Reliable Welding Structure

Radiastar uses professional welding technology and inspection procedures to ensure:

  • Strong weld joints
  • Excellent sealing performance
  • Long-term oil leakage prevention

Application Range of Corrugated Transformer Tanks

Radiastar corrugated transformer tanks are widely used for:

Voltage Classes

  • 10kV distribution transformers
  • 20kV distribution transformers
  • 35kV oil immersed transformers

Transformer Capacity Range

Typical applications include:

  • 10 kVA
  • 50 kVA
  • 100 kVA
  • 630 kVA
  • 1250 kVA
  • 2500 kVA

and other customized transformer ratings.

Industries and Applications

Corrugated transformer tanks are widely applied in:

  • Power distribution networks
  • Solar power plants
  • Wind energy projects
  • Industrial facilities
  • Infrastructure projects
  • Commercial power systems

Corrugated Transformer Tank Manufacturing Process

Radiastar follows strict manufacturing procedures to ensure product reliability.

1. Steel Plate Processing

High-quality steel plates are processed through:

  • Precision cutting
  • Forming
  • Dimension inspection

to achieve accurate tank components.

2. Corrugation Forming

Special corrugation equipment is used to control:

  • Corrugation depth
  • Panel spacing
  • Shape accuracy

ensuring consistent production quality.

3. Welding Manufacturing

Advanced gas shielded welding technology ensures:

  • Strong mechanical structure
  • Reliable sealing
  • Stable product quality

4. Leakage and Pressure Testing

Each transformer tank undergoes:

  • Air leakage testing
  • Pressure inspection
  • Welding quality checking

to ensure safe operation.

5. Surface Treatment

The tank surface is treated with:

  • Surface cleaning
  • Anti-corrosion coating
  • Protective painting

to improve durability in outdoor environments.

Corrugated Transformer Tank vs Traditional Transformer Tank

FeatureCorrugated Transformer TankTraditional Flat Wall Tank
Cooling AreaLargerSmaller
Oil ExpansionIntegrated compensationUsually requires conservator
StructureCompactLarger size
MaintenanceLowerHigher
ApplicationDistribution transformersLarge transformers

Why Choose Radiastar Corrugated Transformer Tanks?

Radiastar specializes in manufacturing transformer components, including:

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

Our manufacturing capabilities include:

✔ Customized design
✔ OEM production
✔ Drawing-based manufacturing
✔ Welding inspection
✔ Leakage testing
✔ Export packaging

Radiastar supports customers with complete transformer tank solutions based on:

  • Transformer capacity
  • Voltage level
  • Installation environment
  • Technical drawings

Corrugated Transformer Tank Ordering Information

To receive an accurate quotation, customers should provide:

Transformer Information

  • Transformer rating (kVA/MVA)
  • Voltage level
  • Transformer type
  • Tank dimensions
  • Technical drawings (if available)

Radiastar provides customized:

Corrugated Transformer Tank Manufacturing Solutions

for transformer manufacturers and electrical companies worldwide.

Frequently Asked Questions

What is a corrugated transformer tank?

A corrugated transformer tank is an oil-filled transformer enclosure with corrugated steel walls designed to improve cooling and compensate for transformer oil expansion.

Why are corrugated tanks used in oil immersed transformers?

Corrugated tanks provide better heat dissipation, compact design, and reduced maintenance compared with traditional transformer tanks.

What materials are used for transformer tanks?

Most transformer tanks are manufactured from high-quality carbon steel with protective coatings for corrosion resistance.

Can Radiastar manufacture customized transformer tanks?

Yes. Radiastar provides OEM corrugated transformer tank manufacturing according to customer drawings, transformer specifications, and project requirements.

Conclusion

A well-designed corrugated transformer tank is not only a protective enclosure but also an important part of transformer thermal management.

Through optimized corrugated structure design, reliable welding technology, and strict quality control, Radiastar provides high-performance transformer oil tanks that help improve transformer reliability, cooling efficiency, and service life.

As an experienced Corrugated Transformer Tank Manufacturer, Radiastar is committed to delivering customized transformer tank solutions for customers worldwide.

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