10 Leading oil immersed transformer Suppliers in the world

Jan 16, 2026

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Introduction to Oil Immersed Transformers

Oil immersed transformers are a crucial component in the electrical power system. They are designed to transfer electrical energy between different voltage levels through electromagnetic induction. The core of the transformer is immersed in insulating oil, which serves multiple functions. Firstly, it provides excellent electrical insulation, preventing short - circuits and ensuring the safe operation of the transformer. Secondly, it acts as a coolant, dissipating the heat generated during the transformer's operation, thus maintaining the optimal temperature and extending the transformer's lifespan. Oil immersed transformers are widely used in power generation, transmission, and distribution networks due to their high efficiency, reliability, and long - term performance.


1. Jiangsu VKE Transformer Co., Ltd.

Company Introduction

Jiangsu VKE Transformer Co., Ltd. is a leading player in the transformer manufacturing industry. With years of experience and a strong R & D team, the company has been committed to providing high - quality oil immersed transformers. It adheres to strict quality control standards throughout the production process, from the selection of raw materials to the final product testing. The company's production facilities are equipped with advanced machinery and technology, enabling it to produce transformers with high precision and performance.


VKE Transformer has a wide range of products, including distribution transformers and power transformers. These transformers are suitable for various applications, such as industrial plants, commercial buildings, and residential areas. The company also provides customized solutions according to the specific requirements of customers, ensuring that each transformer meets the unique needs of different projects.


Features and Advantages in Oil Immersed Transformers

  • High - Quality Materials: VKE uses high - grade insulating oil and high - quality silicon steel sheets for the core. The insulating oil has excellent dielectric properties and heat - dissipation capabilities, while the silicon steel sheets reduce core losses, improving the overall efficiency of the transformer.
  • Advanced Manufacturing Technology: The company employs advanced winding technology to ensure uniform winding distribution, which reduces leakage inductance and improves the electrical performance of the transformer. It also uses advanced vacuum drying and oil - filling processes to remove moisture and air from the transformer, enhancing its insulation performance.
  • Customization: VKE can customize oil immersed transformers according to different voltage levels, capacities, and installation requirements. This flexibility allows customers to get the most suitable transformers for their specific projects.
  • After - Sales Service: The company provides comprehensive after - sales service, including installation guidance, maintenance, and repair. Its professional technical support team can quickly respond to customers' needs and solve problems in a timely manner.
  • Website: https://www.vkepower.com/


2. ABB Group

Company Introduction

ABB is a global leader in power and automation technologies. With a history dating back over a century, ABB has a strong reputation for innovation and reliability. The company operates in more than 100 countries and has a vast network of research, development, and manufacturing facilities. ABB's oil immersed transformers are an integral part of its power transmission and distribution solutions.


ABB invests heavily in research and development to continuously improve the performance and efficiency of its transformers. It has a team of world - class engineers and scientists who are dedicated to developing new technologies and materials for transformers. The company also focuses on environmental sustainability and has developed transformers that are more energy - efficient and use environmentally friendly insulating materials.


Features and Advantages in Oil Immersed Transformers

  • Innovative Design: ABB's transformers feature innovative designs that reduce losses and improve energy efficiency. For example, its advanced core design minimizes eddy current losses and hysteresis losses.
  • High - Voltage Capability: ABB has extensive experience in manufacturing high - voltage oil immersed transformers. Its transformers can operate at very high voltage levels, making them suitable for long - distance power transmission.
  • Reliability: ABB's transformers are known for their high reliability. The company uses strict quality control measures during the manufacturing process and conducts comprehensive testing to ensure that each transformer meets the highest standards.
  • Global Support: With its global presence, ABB can provide local support to customers around the world. Its service teams are available 24/7 to handle any maintenance or repair needs.
  • Environmental Friendliness: ABB is committed to environmental protection. It has developed transformers that use biodegradable insulating oils, reducing the environmental impact.


3. Siemens AG

Company Introduction

Siemens is a well - known multinational conglomerate in the fields of electrification, automation, and digitalization. The company has a long - standing history of manufacturing high - quality electrical equipment, including oil immersed transformers. Siemens' transformers are used in a wide range of applications, from small - scale distribution networks to large - scale power generation plants.


Siemens emphasizes digitalization in its transformer manufacturing. It uses advanced sensors and monitoring systems to collect real - time data on the transformer's operation, enabling predictive maintenance and improving the overall reliability of the power grid. The company also has a strong focus on product safety and compliance with international standards.


Features and Advantages in Oil Immersed Transformers

  • Digitalization: Siemens' oil immersed transformers are equipped with digital monitoring systems that can detect potential problems in advance. This allows for proactive maintenance, reducing downtime and improving the efficiency of the power system.
  • High - Performance Cooling Systems: The company has developed advanced cooling systems for its transformers, which can effectively dissipate heat even under high - load conditions. This ensures the long - term stable operation of the transformer.
  • Compliance and Safety: Siemens' transformers comply with strict international safety and quality standards. The company conducts rigorous testing to ensure that the transformers can withstand various environmental and operational conditions.
  • Integration with Power Systems: Siemens' transformers can be easily integrated into existing power systems. The company provides comprehensive solutions that include not only the transformers but also control and protection systems.


4. Schneider Electric

Company Introduction

Schneider Electric is a global specialist in energy management and automation. It offers a wide range of electrical products, including oil immersed transformers. The company focuses on providing sustainable energy solutions, and its transformers are designed to be energy - efficient and environmentally friendly.


Schneider Electric has a strong customer - centric approach. It works closely with customers to understand their needs and provides customized solutions. The company also has a large network of distributors and service centers, ensuring that customers can get timely support.


Features and Advantages in Oil Immersed Transformers

  • Energy Efficiency: Schneider Electric's oil immersed transformers are designed to minimize energy losses. They use advanced core materials and winding techniques to improve the efficiency of power conversion.
  • Customization: The company can customize transformers according to different customer requirements, such as special voltage ratios, enclosure designs, and protection levels.
  • Sustainable Solutions: Schneider Electric is committed to sustainability. Its transformers are designed to use less energy and have a lower environmental impact. For example, it uses recyclable materials in the manufacturing process.
  • Comprehensive Support: Schneider Electric provides comprehensive support to customers, including installation, commissioning, and training. Its service teams are highly trained and can provide technical assistance at any time.


5. Hitachi, Ltd.

Company Introduction

Hitachi is a Japanese multinational conglomerate with a diverse range of businesses, including power systems. Hitachi's oil immersed transformers are known for their high - quality and advanced technology. The company has a long - term commitment to research and development, continuously improving the performance and reliability of its transformers.


Hitachi has a global manufacturing and sales network. It can supply transformers to customers around the world and provide after - sales service. The company also focuses on innovation in areas such as smart grid integration and energy storage.


Features and Advantages in Oil Immersed Transformers

  • Advanced Technology: Hitachi uses advanced materials and manufacturing processes in its transformers. For example, it has developed new types of insulating materials that offer better electrical performance and higher temperature resistance.
  • High - Capacity Transformers: The company has the ability to manufacture high - capacity oil immersed transformers, which are suitable for large - scale power plants and transmission networks.
  • Smart Grid Compatibility: Hitachi's transformers can be integrated into smart grid systems. They are equipped with communication interfaces that allow for remote monitoring and control, improving the overall efficiency of the power grid.
  • Reliability and Durability: Hitachi's transformers are built to last. The company conducts extensive testing to ensure that the transformers can operate reliably under harsh environmental conditions.


6. Toshiba Corporation

Company Introduction

Toshiba is a well - established Japanese company with a long history in the electrical and electronics industry. Its oil immersed transformers are widely used in power distribution and industrial applications. Toshiba focuses on product quality and technological innovation, and it has a strong R & D team dedicated to improving the performance of its transformers.


Toshiba has a global presence, with manufacturing plants and sales offices in many countries. It provides high - quality products and services to customers around the world, and it is committed to meeting the evolving needs of the power industry.


Features and Advantages in Oil Immersed Transformers

  • Quality Assurance: Toshiba has a strict quality control system in place. Every transformer undergoes multiple tests during the manufacturing process to ensure its quality and performance.
  • Advanced Insulation Technology: The company uses advanced insulation technology to improve the electrical insulation properties of its transformers. This reduces the risk of electrical breakdown and extends the lifespan of the transformer.
  • Customized Designs: Toshiba can design and manufacture oil immersed transformers according to specific customer requirements. It has the flexibility to meet different voltage, capacity, and installation needs.
  • Energy - Saving Solutions: Toshiba's transformers are designed to be energy - efficient. They use low - loss core materials and optimized winding designs to reduce energy consumption.


7. Mitsubishi Electric Corporation

Company Introduction

Mitsubishi Electric is a leading Japanese company in the field of electrical and electronic equipment. Its oil immersed transformers are known for their high - performance and reliability. The company has a long - standing tradition of innovation and quality, and it invests heavily in research and development to stay at the forefront of the industry.


Mitsubishi Electric has a global network of production and sales facilities. It provides comprehensive solutions for power transmission and distribution, including transformers, switchgear, and control systems. The company also focuses on environmental protection and has developed transformers that are more energy - efficient and use less harmful materials.


Features and Advantages in Oil Immersed Transformers

  • High - Performance Design: Mitsubishi Electric's transformers are designed for high - performance operation. They have low losses, high efficiency, and can withstand high - voltage and high - current conditions.
  • Advanced Cooling Technology: The company uses advanced cooling technology to ensure the effective dissipation of heat. This allows the transformers to operate continuously under heavy loads without overheating.
  • Environmental Considerations: Mitsubishi Electric is committed to environmental sustainability. Its transformers use environmentally friendly insulating materials and are designed to be recyclable at the end of their lifespan.
  • System Integration: Mitsubishi Electric's transformers can be easily integrated into complex power systems. The company provides integrated solutions that include control and protection systems, ensuring the stable operation of the entire power network.


8. Crompton Greaves Limited

Company Introduction

Crompton Greaves is an Indian company with a significant presence in the global power equipment market. It manufactures a wide range of electrical products, including oil immersed transformers. The company has a long history of providing reliable and cost - effective solutions to customers in different sectors.


Crompton Greaves has a large manufacturing facility in India and also has a presence in other countries. It focuses on product quality and customer satisfaction, and it continuously invests in upgrading its technology and manufacturing processes.


Features and Advantages in Oil Immersed Transformers

  • Cost - Effectiveness: Crompton Greaves' oil immersed transformers offer a good balance between cost and performance. The company uses efficient manufacturing processes and sourcing strategies to keep the costs down without compromising on quality.
  • Local Support: With its strong presence in India and other regions, the company can provide local support to customers. This includes fast delivery, installation, and after - sales service.
  • Wide Range of Products: The company offers a wide range of oil immersed transformers with different capacities and voltage levels. This allows customers to choose the most suitable transformers for their specific applications.
  • Quality Control: Crompton Greaves has a strict quality control system. Each transformer is tested thoroughly before leaving the factory to ensure its performance and reliability.


9. Bharat Heavy Electricals Limited (BHEL)

Company Introduction

BHEL is a leading public sector company in India. It is one of the largest engineering and manufacturing companies in the country, with a focus on power generation and transmission equipment. BHEL's oil immersed transformers are used in various power projects across India and in other countries.


The company has a large - scale manufacturing infrastructure and a highly skilled workforce. It is committed to technological advancement and has developed several indigenous technologies for transformer manufacturing.


Features and Advantages in Oil Immersed Transformers

  • Indigenous Technology: BHEL has developed several indigenous technologies for oil immersed transformers. This reduces its dependence on foreign technology and allows for better customization according to local requirements.
  • Large - Scale Manufacturing: The company has the capacity to manufacture large - scale oil immersed transformers. This makes it suitable for large - scale power projects.
  • Quality and Reliability: BHEL's transformers are known for their high quality and reliability. The company follows strict quality control measures and has a good track record of supplying transformers for critical power applications.
  • After - Sales Support: BHEL provides comprehensive after - sales support. Its service teams are available to handle maintenance, repair, and upgrade requirements of the transformers.


10. Hyosung Heavy Industries Corporation

Company Introduction

Hyosung Heavy Industries is a South Korean company that is actively involved in the power equipment industry. It manufactures a variety of electrical products, including oil immersed transformers. The company has a reputation for quality and innovation, and it is constantly striving to improve its products and services.


Hyosung Heavy Industries has a global sales network and exports its transformers to many countries. It focuses on meeting the needs of customers in different regions and provides customized solutions accordingly.


Features and Advantages in Oil Immersed Transformers

  • Innovative Design: Hyosung's oil immersed transformers feature innovative designs that improve performance and reduce losses. For example, it uses advanced core designs to minimize magnetic losses.
  • High - Quality Manufacturing: The company uses high - quality materials and advanced manufacturing processes to ensure the reliability of its transformers. Each transformer is subjected to strict quality control tests.
  • Customization for Global Markets: Hyosung can customize its transformers according to the specific requirements of different global markets. It takes into account factors such as local voltage standards, environmental conditions, and installation requirements.
  • Research and Development: The company invests in research and development to stay ahead in the industry. It is constantly exploring new materials and technologies to improve the performance of its transformers.


Conclusion

The 10 companies mentioned above are among the leading oil immersed transformer suppliers in the world. Each company has its own unique features and advantages, whether it is in terms of technology innovation, product quality, customization capabilities, or after - sales service. Jiangsu VKE Transformer Co., Ltd. stands out with its high - quality customized solutions and strong after - sales support. ABB, Siemens, and Schneider Electric are global giants with a long - standing reputation for innovation and reliability, and they are at the forefront of digitalization and sustainable energy solutions. Asian companies like Hitachi, Toshiba, Mitsubishi Electric, Crompton Greaves, BHEL, and Hyosung Heavy Industries also play important roles in the global market, offering a combination of advanced technology and cost - effective solutions. As the demand for electricity continues to grow and the power industry evolves towards a more sustainable and digital future, these companies will continue to drive innovation and provide high - quality oil immersed transformers to meet the diverse needs of customers around the world.