I. Product Description
The Oil-Immersed Transformer is a classic power transformation device that utilizes insulating oil as the core insulation and cooling medium. It fully immerses the high-permeability silicon steel sheet core and copper winding within a sealed oil tank, facilitating heat transfer through natural convection of the insulating oil. This transformer is capable of converting high-voltage grid voltages such as 10kV and 35kV into the commonly used low voltage of 0.4V at the user side, covering a safe capacity range from 10kVA to tens of thousands of kVA. It is currently the most widely used distribution equipment in industrial and mining power grids, outdoor substations, and large-scale power transmission and distribution scenarios. The entire series complies with the national industry standard GB/T 1094.7-2024.
II. execution standard
GB1094.1~2-1996 Power Transformers
GB1094.3~5-2003 Power Transformers
GB1094.4-2005 Power Transformers
GB/T6451-2008 Technical Parameters and Requirements for Three-phase Oil-immersed Power Transformers
III. Product Features
Excellent heat dissipation performance: Relying on the strong thermal conductivity of insulating oil, combined with external cooling fins/pipes, it achieves efficient heat exchange, ensuring stable temperature control even during long-term full-load operation, and is suitable for high-load continuous power supply scenarios.
Longer service life: Insulating oil can isolate oxygen and moisture, providing comprehensive protection for the iron core and windings, significantly delaying the aging of internal insulating materials. Under normal operating conditions, the service life can reach over 30 years.
Lower operation and maintenance costs: With a mature and reliable structure, simple troubleshooting and component replacement processes, the procurement and maintenance costs over the entire life cycle are significantly lower than those of Dry-type Transformers of the same capacity, making it suitable for remote outdoor sites.
Outstanding overload capacity: The oil-cooled thermal buffer space is ample, capable of withstanding 1.2-1.5 times the rated load impact for a short period of time, perfectly adapting to power consumption scenarios with large seasonal fluctuations such as rural power grids and industrial plant areas.
Wide range of application scenarios: Supporting outdoor pole mounting and deployment in open-air substations, from ordinary urban and rural distribution networks to large power plant step-up stations, corresponding mature models can be found, with strong technical implementation coverage.
IV. Performance characteristics
Compared with the "8" series products, the S13 series products have a 14.88% reduction in no-load loss, a 10.47% reduction in load loss, and a 11.14% reduction in total loss. The energy-saving benefits are significant, and there are good social benefits.
| Model | Material | Size |
| S9/S11/S13 | Copper/Aluminum | 150*100*150cm |
At Jihui Electric Group Co., Ltd., we specialize in the research, development, manufacturing, and supply of medium and low voltage power transmission and distribution equipment. Our Energy-saving 11kV 400kVA oil-immersed distribution transformer is designed to provide stable, efficient, and reliable power conversion solutions for industrial facilities, commercial buildings, renewable energy projects, and electrical distribution networks.
With years of experience in the power equipment industry, we understand that a transformer is not only a device for changing voltage levels. It is a key component that affects the safety, efficiency, and long-term stability of an entire electrical system. A reliable transformer helps reduce power losses, improve equipment operation, and lower maintenance costs.
Our 400kVA oil immersed transformer is developed for 11kV medium voltage distribution systems. It combines energy-saving design, efficient cooling performance, strong insulation capability, and durable construction to meet the requirements of modern power applications.
We focus on providing practical transformer solutions instead of only producing standard equipment. According to different project requirements, we can support customized specifications, including winding materials, voltage parameters, protection accessories, and installation conditions.
From industrial plants and infrastructure projects to commercial facilities and renewable energy systems, our energy efficient oil transformer solutions help customers achieve safer and more economical power distribution.
An oil-immersed distribution transformer is an electrical device that transfers electrical energy between different voltage levels through electromagnetic induction. It uses transformer oil as both an insulation medium and a cooling medium, allowing the equipment to operate efficiently under continuous electrical loads.
Our Energy-saving 11kV 400kVA oil-immersed distribution transformer is designed for medium voltage applications where stable operation and energy efficiency are important. The transformer receives electricity from an 11kV distribution network and reduces the voltage to a suitable level for industrial equipment, commercial facilities, and other electrical loads.
The rated capacity of 400kVA means that the transformer can provide power for medium-sized electrical systems. This capacity is widely used in factories, workshops, office buildings, agricultural facilities, small industrial parks, and distributed energy projects.
Compared with conventional transformers, energy-saving transformers are designed to reduce unnecessary energy losses during operation. Since transformers often work continuously for many years, even small improvements in efficiency can create significant energy savings over the equipment lifetime.
The working principle of our 11KV Distribution Transformer is based on electromagnetic induction. The transformer mainly consists of a magnetic core, high voltage winding, low voltage winding, insulating oil, transformer tank, and protection components.
When alternating current enters the high voltage winding, it creates a changing magnetic field inside the transformer core. This magnetic field transfers electrical energy to the low voltage winding, allowing the transformer to change the voltage level.
For example, electricity from an 11kV medium voltage network can be converted into a lower voltage level suitable for factory equipment, lighting systems, and electrical machinery.
During operation, electrical components generate heat. The transformer oil absorbs this heat and transfers it to the tank surface. The heat is then released into the surrounding environment through natural cooling or additional cooling methods.
This oil cooling system allows the transformer to maintain stable operating temperatures and improves reliability during long-term operation.
When we design our transformers, we focus on the actual needs of customers. A good transformer should provide stable performance, consume less energy, require reasonable maintenance, and continue working reliably for many years.
Energy efficiency is one of the most important considerations in modern power systems. Our energy-saving oil immersed transformer uses optimized core materials and improved structural design to reduce no-load losses and load losses.
Because transformers operate continuously in many applications, reducing energy loss can help customers save electricity costs throughout the service life of the equipment.
The low loss design also helps reduce heat generation, improving transformer efficiency and operating stability.
The 11kV voltage level is widely used in industrial and commercial power distribution systems. Our transformer is designed to provide reliable voltage conversion for medium voltage networks.
The electrical structure is optimized to maintain stable performance under different load conditions, helping customers avoid unnecessary power interruptions.
Heat management directly affects transformer service life. The oil cooling system provides effective heat transfer and helps maintain suitable operating temperatures.
Compared with air cooling systems, oil cooling provides strong heat dissipation performance, making oil immersed transformers suitable for applications requiring continuous operation.
Insulation quality is essential for transformer safety. Our transformers use high-quality insulating oil and insulation materials to reduce the risk of electrical breakdown.
The insulation system helps protect internal components from electrical stress, moisture, and environmental influences.
A transformer is a long-term investment for any electrical system. Our manufacturing process focuses on durability, reliability, and consistent performance.
By selecting reliable materials and controlling every production step, we help customers reduce downtime and improve equipment availability.
According to project requirements, our 400kVA oil immersed transformer can be configured with copper or aluminum winding.
Copper winding provides excellent conductivity and strong electrical performance, while aluminum winding offers advantages in weight reduction and cost efficiency. We select suitable winding materials according to customer application requirements.
Many customers consider efficiency when selecting transformers because operating costs can become significant over many years. Energy-saving transformers are designed to improve efficiency and reduce unnecessary energy consumption.
| Comparison Item | Energy-saving Oil Transformer | Conventional Transformer |
|---|---|---|
| Core Design | Optimized low-loss core structure | Traditional core design |
| Energy Loss | Lower no-load and load losses | Higher energy consumption |
| Operating Efficiency | Improved long-term efficiency | Standard efficiency performance |
| Heat Generation | Reduced heat loss and better efficiency | Higher operating losses |
| Application | Energy-conscious industrial and commercial systems | General power distribution applications |
Source: Comparison based on common transformer efficiency improvement practices and IEC 60076 series transformer performance requirements.
At Jihui Electric, we believe transformer performance depends on every detail, from material selection to manufacturing accuracy. Our engineering team focuses on improving reliability, efficiency, and practical usability.
The core is the heart of a transformer. A high-quality core improves magnetic performance and reduces unnecessary energy loss.
We use optimized core structures to support efficient operation and stable performance during continuous use.
The winding system directly affects transformer electrical performance. Our production process controls winding accuracy, insulation distance, and mechanical strength.
A stable winding structure helps the transformer handle different operating conditions while maintaining reliable performance.
Our production process includes material inspection, component manufacturing, transformer assembly, oil filling, electrical testing, and final inspection.
Each step is carefully controlled to ensure the final product meets customer requirements.
Our energy-saving 11kV 400kVA oil-immersed distribution transformer is designed for various applications. It can be used in industrial environments, commercial facilities, renewable energy systems, and infrastructure projects.
The strong structure and reliable insulation system allow stable operation under different environmental conditions.
During our years of manufacturing and supplying power distribution equipment, we have worked with customers from different industries and learned that every electrical system has its own challenges. Some applications require continuous operation, some focus on energy efficiency, and others need transformers that can operate reliably in demanding environments.
Our Energy-saving 11kV 400kVA oil-immersed distribution transformer is designed to meet these practical requirements. With stable voltage conversion, efficient cooling performance, and reliable insulation technology, it is suitable for a wide range of medium voltage power distribution applications.
Factories and industrial plants require stable electricity to keep production lines operating. Equipment such as motors, compressors, automation systems, welding machines, and manufacturing equipment often depend on reliable power supply.
Our 400kVA oil immersed transformer provides efficient power conversion for industrial applications. The transformer helps maintain stable voltage levels and supports continuous operation in manufacturing environments.
It is commonly used in machinery factories, automotive production facilities, electronics manufacturing plants, metal processing industries, and industrial parks.
Commercial buildings require safe and reliable electrical systems to support lighting, elevators, air conditioning systems, security systems, and other electrical equipment.
Our 11kV distribution transformer solutions provide stable power conversion for office buildings, shopping centers, hotels, schools, and public facilities.
The efficient design helps reduce operating losses while maintaining reliable electrical performance.
With the development of solar power and other renewable energy systems, reliable transformer equipment has become increasingly important. Renewable energy projects require transformers that can operate efficiently under changing power conditions.
Our energy efficient oil transformer solutions can be integrated into solar farms, distributed energy systems, and other renewable power projects to support stable grid connection.
Industrial parks and infrastructure projects usually require centralized power distribution systems. Transformers play an important role in transferring electricity safely from medium voltage networks to end-use equipment.
Our 400kVA 11kV transformer provides a practical solution for electrical distribution systems where reliability and efficiency are important.
Modern agricultural operations increasingly depend on electrical equipment such as irrigation systems, storage facilities, and processing equipment.
Our oil immersed distribution transformers provide reliable power conversion for agricultural applications requiring stable electricity supply and long service life.
| Application Area | Main Power Requirement | Transformer Advantage |
|---|---|---|
| Industrial Manufacturing | Continuous power supply | Stable operation and efficient cooling |
| Commercial Buildings | Safe and reliable electricity | Low loss and dependable performance |
| Renewable Energy | Efficient grid connection | Energy-saving transformer design |
| Infrastructure | Long-term operation | Durable structure and reliability |
Source: Application information is based on common medium voltage distribution transformer applications and IEC 60076 transformer engineering practices.
At Jihui Electric, we believe that transformer quality comes from every production detail. A reliable transformer is not only made from good materials but also depends on accurate manufacturing processes and strict inspection procedures.
Before production starts, our engineering team reviews customer requirements, including rated capacity, voltage level, frequency, winding material, installation conditions, and operating environment.
For an Energy-saving 11kV 400kVA oil-immersed distribution transformer, we optimize the design according to actual application requirements to ensure reliable performance.
The transformer core directly affects energy efficiency. We use electrical steel materials with accurate processing technology to reduce magnetic losses.
A well-designed core structure helps improve transformer efficiency, reduce operating temperature, and lower energy consumption during long-term operation.
The winding process requires high precision because winding quality directly affects electrical performance.
Our production team controls conductor arrangement, insulation distance, and mechanical strength during manufacturing. Customers can select copper or aluminum winding according to project requirements.
After core and winding production are completed, our technicians assemble the transformer body, install internal components, and complete electrical connections.
Every assembly step is carefully controlled to ensure mechanical reliability and safe operation.
Transformer oil is an important part of oil immersed transformer technology. It provides electrical insulation and transfers heat away from internal components.
During production, qualified insulating oil is filled into the transformer under controlled conditions. The sealing process helps prevent leakage and protects the internal structure.
Before shipment, every transformer undergoes professional testing and inspection. We check electrical performance, insulation quality, mechanical structure, and appearance.
These procedures ensure that each transformer meets customer requirements before leaving our factory.
| Quality Control Stage | Main Inspection Items | Purpose |
|---|---|---|
| Material Inspection | Core materials, conductor materials, insulation oil | Ensure reliable raw materials |
| Production Inspection | Winding quality and assembly accuracy | Improve transformer performance |
| Electrical Testing | Insulation, resistance, loss testing | Confirm electrical reliability |
| Final Inspection | Appearance and technical documents | Ensure safe delivery |
Source: Quality control procedures are based on transformer manufacturing practices and IEC 60076 series requirements.
Our transformer parameters can be customized according to customer requirements. The following table shows typical specifications for a 400kVA 11kV oil immersed distribution transformer.
| Parameter | Typical Specification |
|---|---|
| Rated Capacity | 400kVA |
| High Voltage | 11kV |
| Transformer Type | Oil-immersed Distribution Transformer |
| Phase | Three Phase |
| Winding Material | Copper / Aluminum (Cu/Al) |
| Cooling Method | Oil Natural Air Natural (ONAN) |
| Application | Industrial and commercial power distribution |
Source: Typical transformer specification reference based on common medium voltage distribution transformer configurations.
Selecting a transformer supplier means choosing a partner responsible for the long-term reliability of your electrical system. At Jihui Electric, we focus on providing reliable products, professional technical support, and complete project services.
Jihui Electric Group Co., Ltd. specializes in medium and low voltage power transmission and distribution equipment up to 35kV.
Our product range includes oil immersed transformers, Dry-type Transformers, Cable accessories, Cable distribution boxes, ring main units, Prefabricated Substations, combination transformers, SF6 load switches, and Vacuum circuit breakers.
We have established a complete quality management system and obtained ISO9001 quality management certification, ISO14001 environmental management certification, and ISO45001 occupational health and safety management certification.
These certifications support our commitment to stable manufacturing, responsible production, and continuous improvement.
Different projects have different requirements. We support customized transformer solutions according to customer specifications, including:
Voltage level customization
Copper or aluminum winding selection
Transformer protection accessories
Installation environment requirements
Special project specifications
Our engineering team works with customers to provide suitable transformer solutions instead of simple standard products.
For global customers, we provide complete export support including technical communication, production arrangement, quality inspection, packaging, and transportation coordination.
According to product size, quantity, and destination, we select suitable transportation methods such as sea freight, land transportation, or combined logistics.
Professional packaging methods are used to protect transformers from moisture, vibration, and impact during transportation.
It is mainly used for medium voltage power distribution in factories, commercial buildings, renewable energy systems, industrial parks, and infrastructure projects.
Oil immersed transformers provide excellent heat dissipation and are suitable for applications requiring higher continuous load capacity and outdoor installation.
Yes. We can provide copper or aluminum winding options according to customer requirements and project conditions.
We control quality through material inspection, production management, electrical testing, and final inspection before shipment.
Yes. We provide export services including technical support, packaging, transportation arrangement, and delivery coordination for international customers.
At Jihui Electric Group Co., Ltd., we are committed to providing safe, reliable, and energy-efficient power distribution solutions for customers worldwide.
Our Energy-saving 11kV 400kVA oil-immersed distribution transformer combines low-loss design, reliable insulation, efficient cooling, and durable construction to support modern electrical systems.
With professional manufacturing experience, strict quality control, and flexible customization capability, we help customers improve power reliability and reduce long-term operating costs.
If you are looking for a professional 400kVA oil immersed transformer manufacturer or need a customized 11kV distribution transformer solution, Jihui Electric is ready to provide reliable products and professional support for your project.
JiHui Electric Group Co., Ltd , high-end website construction, foreign trade website construction, marketing website construction, website optimization, development websites, corporate network marketing, search engine promotion, wechat mini program, corporate mailbox, short video operation, etc.
No. 161 Jingliu Road, Yueqing Economic Development Zone, Yueqing City, Zhejiang Province, China
jh.power@jihuielec.com
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