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 Oil-Immersed Transformer 1500kVA 11kV is designed to provide stable, efficient, and reliable power conversion solutions for industrial facilities, commercial projects, renewable energy systems, and electrical distribution networks.
As a Transformer Manufacturer, we understand that power equipment must perform reliably for many years under different operating conditions. A transformer is not simply a voltage conversion device. It is a key part of the entire power system, directly affecting power stability, equipment safety, and operating efficiency.
Our 1500kVA 11kV oil immersed transformer combines proven transformer technology with strict manufacturing processes. By using high-quality materials, optimized structural design, and professional testing procedures, we provide customers with dependable transformer solutions for medium voltage applications.
The transformer is widely used in factories, industrial parks, substations, commercial buildings, infrastructure projects, and renewable energy facilities. It helps convert 11kV medium voltage electricity into a suitable voltage level for different electrical loads, ensuring safe and continuous power supply.
An oil-immersed transformer is an electrical transformer that uses insulating oil as both an insulation medium and a cooling medium. Compared with Dry-type Transformers, oil immersed transformers are commonly used in applications requiring higher capacity, efficient heat dissipation, and long-term outdoor operation.
Our Oil-immersed Transformer 1500kVA 11kV is a three-phase medium voltage distribution transformer designed for 11kV power systems. The rated capacity of 1500kVA means the transformer can handle electrical loads up to 1500 kilovolt-amperes under designed operating conditions.
The main components include the transformer core, winding system, transformer oil, tank, cooling structure, and protection accessories. These components work together to ensure reliable voltage conversion and stable electrical performance.
The transformer oil inside the tank provides insulation between internal electrical parts and helps transfer heat generated during operation. Through natural or forced cooling methods, heat is released from the transformer to maintain safe operating temperatures.
The operating principle of our three phase oil transformer is based on electromagnetic induction. Although transformer technology involves electrical engineering principles, the basic idea is simple: the transformer changes voltage levels while transferring electrical energy.
When alternating current enters the high voltage winding, it creates a changing magnetic field inside the transformer core. This magnetic field generates voltage in the low voltage winding. By adjusting the winding ratio, the transformer can step down high voltage electricity into a lower voltage suitable for end-use equipment.
For an 11KV Distribution Transformer, the high voltage side receives electricity from the medium voltage network, while the low voltage side supplies power to factories, buildings, machines, or other electrical systems.
During operation, electrical energy creates heat inside the transformer. The insulating oil absorbs this heat and transfers it to the transformer tank surface, where the heat is released into the surrounding environment.
A reliable transformer depends on the quality and cooperation of every internal component. At Jihui Electric, we focus on improving each part of the transformer structure to ensure stable operation.
The transformer core provides the magnetic path required for voltage conversion. We use high-quality electrical steel materials and optimized core structures to reduce energy losses and improve efficiency.
A well-designed core helps reduce no-load losses and operating noise, which is especially important for transformers running continuously throughout the year.
The winding system is one of the most important parts of a transformer. Our 1500kVA oil immersed transformer can be designed with copper or aluminum winding according to customer requirements.
Copper windings provide excellent conductivity and strong mechanical performance, while aluminum windings offer advantages in weight and cost efficiency. We select suitable conductor materials based on project requirements.
Transformer oil plays two important roles: insulation and cooling. It prevents electrical breakdown between internal components and helps remove heat during operation.
The oil insulation system improves transformer reliability and allows the equipment to operate under different environmental conditions.
The transformer tank protects internal components from external environmental influences. Our tank design provides mechanical strength and helps maintain safe operation under different conditions.
For outdoor installations, the tank structure provides protection against dust, moisture, and weather changes.
The 1500kVA capacity makes this transformer suitable for medium and large electrical loads. It can support industrial equipment, production lines, commercial facilities, and infrastructure systems requiring stable power supply.
Compared with smaller transformers, the 1500kVA oil immersed transformer provides higher power capability while maintaining reliable operation.
Heat control is important for transformer service life. The oil cooling system efficiently transfers heat away from internal components, helping maintain suitable operating temperatures.
This makes oil immersed transformers suitable for applications requiring continuous operation and higher load capacity.
The insulation system directly affects transformer safety. Our transformers use high-quality insulating oil and insulation materials to reduce the risk of electrical failure.
The insulation structure helps maintain stable performance even when the transformer operates under changing load conditions.
A well-designed oil immersed transformer can provide many years of reliable service when properly installed and maintained.
Through careful material selection, accurate manufacturing, and complete testing, we focus on improving product durability and reducing unexpected downtime.
Oil immersed transformers are commonly selected for outdoor substations and industrial power systems because of their strong environmental adaptability.
The sealed structure and protective tank design allow the transformer to operate reliably in different weather conditions.
When selecting transformer equipment, customers often compare oil immersed transformers and dry-type transformers. The correct choice depends on installation conditions, capacity requirements, safety requirements, and operating environment.
| Comparison Item | Oil-immersed Transformer | Dry-type Transformer |
|---|---|---|
| Insulation Method | Transformer oil insulation | Solid insulation materials |
| Cooling Method | Oil cooling with natural or forced circulation | Air cooling |
| Capacity Range | Suitable for medium and large capacity applications | Commonly used for small and medium capacity systems |
| Installation Environment | Outdoor substations and industrial areas | Indoor buildings and safety-sensitive locations |
| Maintenance | Requires oil inspection and maintenance | Lower routine maintenance requirements |
Source: Comparison based on IEC 60076 transformer standards and common electrical engineering application practices.
At Jihui Electric, we do not only focus on producing transformers. We focus on providing reliable electrical solutions that help customers operate their power systems safely and efficiently.
Energy loss is an important factor in transformer operation. Our engineering team optimizes core design, winding structure, and manufacturing processes to improve transformer efficiency.
Reducing energy loss helps customers lower operating costs and improve long-term economic performance.
Although this product is designed as a 1500kVA 11kV oil immersed transformer, we can provide customized solutions according to project requirements, including voltage ratings, winding materials, protection accessories, and installation conditions.
Every transformer passes through multiple production stages, including material inspection, component assembly, electrical testing, and final quality inspection.
This production control system helps us provide consistent transformer quality for customers worldwide.
During our experience in the power distribution industry, we have seen that different industries have different requirements for transformer equipment. Some customers need transformers for continuous factory production, some need reliable power support for infrastructure projects, and others require stable operation in outdoor environments.
Our Oil-immersed Transformer 1500kVA 11kV is designed for medium voltage distribution systems where reliability, efficiency, and long service life are important. With strong heat dissipation performance and stable electrical characteristics, this transformer is suitable for many industrial and commercial applications.
Manufacturing plants depend on stable electricity to keep production lines running. Equipment such as motors, automation systems, machining equipment, and industrial control systems require continuous power supply.
Our 1500kVA 11kV oil immersed transformer provides reliable voltage conversion for factories and industrial facilities. The transformer helps maintain stable electrical supply while supporting high-power equipment operation.
It is commonly used in industries such as machinery manufacturing, automotive production, metal processing, electronics manufacturing, and industrial parks.
Electricity distribution networks require transformers to transfer power from medium voltage systems to usable voltage levels. Our 11kV distribution transformer solutions are widely used in substations, electrical distribution stations, and industrial power networks.
The oil immersed structure provides reliable operation and efficient cooling, making it suitable for long-term service in power distribution applications.
Renewable energy projects such as solar farms and wind power facilities require dependable transformer equipment to connect generated electricity to distribution networks.
Our medium voltage transformer solutions help convert and transfer electricity efficiently. The strong cooling performance of oil immersed transformers makes them suitable for applications with continuous power operation requirements.
Large commercial facilities such as shopping centers, office complexes, airports, and transportation systems require reliable electrical systems.
Our transformers provide stable power conversion for these applications. With proper installation and maintenance, the equipment can support long-term operation and reduce unexpected power interruptions.
Mining operations and heavy industries usually have demanding electrical requirements. Equipment must operate reliably under conditions such as dust, temperature changes, and heavy loads.
The robust structure and efficient cooling design of oil immersed transformers make them suitable for industrial environments requiring dependable power supply.
| Application Field | Transformer Requirement | 1500kVA 11kV Oil Transformer Advantage |
|---|---|---|
| Manufacturing Plants | Continuous and stable power supply | Reliable operation under industrial loads |
| Power Distribution | Efficient voltage conversion | Strong insulation and cooling performance |
| Renewable Energy | Stable grid connection | Suitable for continuous operation |
| Infrastructure Projects | Long service life | Durable outdoor design |
Source: Application information is based on common medium voltage transformer applications and IEC 60076 transformer engineering practices.
At Jihui Electric, we believe transformer reliability starts from the manufacturing process. A high-quality transformer requires careful engineering design, suitable materials, accurate production, and strict testing.
Before production begins, our engineering team confirms all technical requirements with customers. These requirements may include rated capacity, voltage level, frequency, winding material, installation environment, and protection requirements.
For an Oil-immersed Transformer 1500kVA 11kV, we carefully evaluate operating conditions to ensure the final product matches the customer's electrical system.
The transformer core is manufactured using high-quality electrical steel sheets. The core design directly affects energy efficiency, operating temperature, and transformer losses.
Through accurate cutting and assembly processes, we improve magnetic performance and reduce unnecessary energy consumption during operation.
The winding system is one of the most important components inside the transformer. Our production process controls conductor arrangement, insulation distance, and mechanical strength.
Customers can choose copper or aluminum winding according to project requirements. Copper winding provides excellent conductivity, while aluminum winding provides a lightweight and cost-effective option.
After the core and winding components are completed, the transformer enters the assembly stage. Our technicians install internal components, connect electrical parts, and complete the transformer tank structure.
The assembly process requires careful attention because every component affects the final transformer performance.
Transformer oil is an important part of oil immersed transformer technology. During production, we fill the transformer with qualified insulating oil under controlled conditions.
The oil provides electrical insulation and helps transfer heat away from internal components. The sealing process ensures reliable operation and reduces the risk of oil leakage.
Before shipment, every transformer undergoes complete inspection and testing. We check electrical performance, insulation quality, mechanical structure, and appearance.
These testing procedures help ensure that each transformer meets customer requirements before leaving our factory.
| Testing Item | Purpose | Quality Control Goal |
|---|---|---|
| Insulation Test | Check electrical insulation performance | Improve operational safety |
| Resistance Test | Verify winding condition | Ensure electrical stability |
| Loss Test | Measure transformer efficiency | Control energy consumption |
| Appearance Inspection | Check external structure | Ensure delivery quality |
Source: Testing procedures are based on transformer manufacturing practices and IEC 60076 series requirements.
Choosing a transformer supplier is not only about purchasing equipment. It is about finding a partner who understands electrical systems, project requirements, and long-term operation needs.
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.
With complete product categories, we can provide integrated solutions for different power distribution projects.
We have established a complete quality management system and obtained ISO9001 quality management certification, ISO14001 environmental management certification, and ISO45001 occupational health and safety certification.
From raw material inspection to final product testing, we control every production step to maintain consistent product quality.
Different projects require different transformer specifications. We support customized solutions according to customer requirements, including:
Rated voltage customization
Copper or aluminum winding selection
Protection accessories
Installation requirements
Special operating environments
Whether customers need a standard 1500kVA 11kV oil immersed transformer or a customized medium voltage transformer solution, our engineering team can provide professional support.
For international customers, we provide complete export services including technical communication, production scheduling, inspection support, packaging, and transportation arrangement.
According to transformer size, order quantity, and destination, we select suitable transportation methods such as sea transportation, land transportation, or combined logistics.
Before shipment, transformers are professionally packaged with moisture protection, vibration protection, and impact protection to ensure safe delivery.
A 1500kVA 11kV oil immersed transformer is mainly used for medium voltage power distribution in factories, industrial facilities, substations, renewable energy projects, and commercial electrical systems.
Oil immersed transformers use insulating oil for cooling and insulation, providing strong heat dissipation and suitability for higher capacity applications. Dry type transformers use solid insulation materials and are often preferred for indoor locations requiring higher fire safety.
Yes. We can provide copper or aluminum winding options according to customer requirements, project standards, and application conditions.
This product is designed for an 11kV medium voltage system. Customized voltage solutions can also be provided according to customer requirements.
We ensure reliability through careful design, quality material selection, controlled manufacturing processes, and complete factory testing before delivery.
At Jihui Electric Group Co., Ltd., we are committed to providing reliable, efficient, and safe power distribution solutions for customers worldwide.
Our Oil-immersed Transformer 1500kVA 11kV combines strong cooling performance, reliable insulation, durable construction, and flexible customization options. It is designed to support stable operation in industrial, commercial, and infrastructure applications.
With professional manufacturing capability, strict quality control, and complete export service, we help customers build safer and more reliable electrical systems.
If you are looking for a professional 1500kVA 11kV oil immersed transformer manufacturer or need a customized medium voltage transformer solution, Jihui Electric is ready to support your project with reliable products and professional service.
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No. 161 Jingliu Road, Yueqing Economic Development Zone, Yueqing City, Zhejiang Province, China
jh.power@jihuielec.com
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