Transformers
Oil Immersed Transformer
30kVA Oil Immersed Transformer
30kVA Oil Immersed Transformer, produced by a reputable manufacturer and supplier in China, represents the pinnacle of electrical engineering excellence. These transformers are engineered with precision and cutting-edge technology to provide robust, efficient, and long-lasting power solutions.
50kVA Oil Immersed Transformer
50kVA Oil Immersed Transformer is usually pole mounted or installed in a distribution station for daily lighting and factory power, whose an LV output up to 0.4kV. The corrugated tank has thermal expansion and contraction components that enable the transformer oil to be completely isolated from the atmosphere. A distribution transformer can be manufactured according to the requirements of the client. This transformer is optimally designed by patented technology and software. Its performance parameters and requirements meet IEC Standards and Chinese National Standards, and so on.
75kVA Oil Immersed Transformer
75kVA oil-immersed transformer is an efficient and reliable power conversion device, which is widely used in power distribution systems in industrial, commercial, and construction sites. The transformer adopts oil-immersed cooling technology, has good heat dissipation performance, and can work continuously and stably under high load conditions. Its internal use of high-quality copper wire windings and silicon steel sheets ensures low loss and efficient power conversion. The 75kVA oil-immersed transformer also has complete protection functions, including overload protection, short-circuit protection, and temperature monitoring, to ensure the safety and stability of the equipment during operation.
80kVA Oil Immersed Transformer
NPC ELECTRIC 80kva Oil Immersed Transformer boasts a robust design that incorporates high-quality materials and advanced manufacturing techniques. The transformer's core is made from premium cold-rolled silicon steel sheets, ensuring low loss and high efficiency. The windings are constructed using high-grade copper wire, which is carefully insulated to prevent short circuits and ensure long-term reliability. The oil-immersed design of the NPC ELECTRIC 80kVA transformer provides effective cooling and insulation, ensuring that the transformer operates within safe temperature limits and maintains optimal performance. The oil also acts as a dielectric medium, enhancing the transformer's electrical properties and protecting it from environmental factors.
100kVA Oil Immersed Transformer
NPC ELECTRIC 100kva Oil Immersed Transformer boasts a robust design that utilizes high-quality materials to ensure long-lasting performance. Its oil-immersed cooling system provides effective heat dissipation, maintaining optimal operating temperatures even under heavy loads. This transformer is designed to handle a maximum power capacity of 100kVA, making it suitable for a wide range of applications, including commercial, industrial, and residential settings. One of the standout features of the SGOB 100kva Oil Immersed Transformer is its advanced insulation system, which enhances its short-circuit resistance and overall safety. The transformer also features a precision-engineered winding structure that optimizes electrical performance and reduces energy loss.
125kVA Oil Immersed Transformer
125kVA Oil Immersed Transformer has the characteristics of high efficiency and low loss, which can several of power consumption and operation cost, and has significant social benefits.It is a high-tech product promoted by the state. The NPC ELECTRIC 125kva Oil Immersed Transformer, manufactured and supplied by a leading Chinese manufacturer, is are highly advanced electrical device engineered to meet the rigorous demands of modern power distribution systems. Crafted with precision and utilizing cutting-edge technology, these transformers are renowned for their exceptional durability, efficiency, and reliability. As a trusted supplier in China, the manufacturer offers a comprehensive range of 125kVA Oil Immersed Transformers tailored to suit various applications, ensuring optimal performance and long-term value to customers worldwide.
160kVA Oil Immersed Transformer
The 160kVA Oil-Immersed Transformer is characterized by its high efficiency and low loss, significantly reducing power consumption and operational costs. This transformer offers notable social benefits and is a high-tech product actively promoted by the government. Produced by a leading Chinese manufacturer, the NPC ELECTRIC 160kVA Oil-Immersed Transformer represents a pinnacle of electrical engineering, designed to meet the stringent demands of contemporary power distribution systems. These transformers are crafted with precision and incorporate cutting-edge technology, renowned for their exceptional durability, efficiency, and reliability. As a trusted supplier in China, the manufacturer provides a comprehensive range of 160kVA Oil-Immersed Transformers tailored to various applications, ensuring optimal performance and long-term value for customers globally.
200kVA Oil Immersed Transformer
The 200kVA oil-immersed transformer produced by our company adopts a new insulation structure to improve the short-circuit resistance; the iron core is made of high-quality cold-rolled silicon steel sheet; the high-voltage winding is made of high-quality oxygen-free copper wire and adopts a multi-layer cylindrical structure; all fasteners are treated with special anti-loosening treatment. 200kVA Oil Immersed Transformer has the characteristics of high efficiency and low loss, which can several of power consumption and operation cost, and has significant social benefits. It is a high-tech product promoted by the state.
250kVA Oil Immersed Transformer
The 250kVA Oil Immersed Transformer produced by NPC ELECTRIC adopts a new insulation structure to improve the short-circuit resistance; the core adopts high-quality cold-rolled silicon steel sheets; the high-voltage winding adopts high-quality oxygen-free copper wire and adopts a multi-layer cylinder structure; all fasteners are specially treated to prevent loosening. The 250kVA oil-immersed transformer has the characteristics of high efficiency and low loss, which can reduce power consumption and operating costs, has significant social benefits, and is a high-tech product promoted by the country.In-Depth Analysis
Oil-immersed transformers are built to deliver high efficiency, reliable performance, and advanced safety, helping businesses reduce energy costs while ensuring stable power supply. With future-ready adaptability for renewable energy and smart grid applications.
Comparative Analysis of Efficiency and Loss
Compared to the industry average, transformers exhibit lower losses and higher efficiency across the entire load range.
Load Efficiency Comparison(%)
No-load Loss Comparison(W)
High-efficiency Core Design
High magnetic permeability and low loss silicon steel sheets are used and processed by special process to reduce hysteresis loss and eddy current loss and improve conversion efficiency.
Improved Magnetic Permeability
+30%
Reduced Iron Loss
-35%
Multiple Protection Systems
IP65 protection grade design combines multiple protection measures such as anti-corrosion, anti-UV, anti-condensation and anti-small animal intrusion.
Waterproof Performance
IP65
Anti-Corrosion Ability
15 years+
Ultra-low Noise Technology
A special shock-absorbing structure, low-noise fans, and optimized heat dissipation design ensure operating noise is far below industry standards.
Noise Reduction
-15dB
Suitability for Residential Areas
Excellent
Intelligent Cooling System
The heat dissipation system with adaptive temperature control automatically adjusts the heat dissipation efficiency according to the load and ambient temperature to reduce energy consumption.
Heat Dissipation Efficiency
+40%
Temperature Stability
±2℃
Safety Wiring System
Insulated protective cover and anti-misoperation design ensure personnel safety during installation and maintenance and reduce accident risks
Insulation Grade
Class H
Safety Protection
IP2X
Intelligent Monitoring
An optional remote monitoring system is available to monitor operating status, temperature, load and other parameters in real time, and supports fault warning and remote diagnosis.
Data Collection Frequency
one times a minute
Fault Warning Accuracy
96%
Environmental Adaptability Analysis
Oil-immersed Transformers have been rigorously tested and can operate stably under various harsh environmental conditions.
Temperature Range
-40℃ ~ +55℃
Can work normally in extreme high and low temperature environments
Humidity Adaptation
0 ~ 100% RH
Including condensation environment, no frost requirement
Seismic Resistance Level
IEC 60068-2-57
Suitable for earthquake-prone areas
Altitude
≤3000m
More than special design
Why Choose Us
Discover why our Oil-immersed transformers are trusted worldwide for efficiency, safety, and reliability.
Oil-immersed Transformers Manufacturer
As a leading oil-immersed transformer manufacturer, NPC Electric specializes in designing and producing high-performance oil-immersed distribution transformers for power utilities, industrial facilities, and commercial networks. Our oil-immersed transformers are built with premium-grade materials and advanced insulation systems to ensure excellent cooling performance, high efficiency, and long service life.
We offer a full range of capacities and voltage ratings, including power transformers and substation transformers, customized to meet specific project requirements. Every unit is tested under strict IEC and ANSI standards to guarantee superior reliability, low noise, and minimal maintenance. Whether you need a standard oil-filled unit or a specialized design for challenging environments, NPC Electric delivers proven transformer solutions trusted worldwide.
We offer a full range of capacities and voltage ratings, including power transformers and substation transformers, customized to meet specific project requirements. Every unit is tested under strict IEC and ANSI standards to guarantee superior reliability, low noise, and minimal maintenance. Whether you need a standard oil-filled unit or a specialized design for challenging environments, NPC Electric delivers proven transformer solutions trusted worldwide.
Oil-immersed Transformer Structure
The oil-immersed transformer structure consists of a magnetic core, windings, an oil tank, and a cooling system that ensures efficient heat dissipation. The insulating oil provides both cooling and electrical insulation, protecting the distribution transformer from overheating and voltage stress.
Each oil-immersed transformer is enclosed in a sealed steel tank to prevent moisture and contamination. This robust structure ensures durability, reliability, and long service life, making it ideal for power networks and substation transformer applications in residential, commercial, and industrial environments.
Each oil-immersed transformer is enclosed in a sealed steel tank to prevent moisture and contamination. This robust structure ensures durability, reliability, and long service life, making it ideal for power networks and substation transformer applications in residential, commercial, and industrial environments.
Oil-immersed Transformer Types
Different oil-immersed transformer types are designed to serve various voltage levels and load conditions. The distribution transformer is widely used in residential, rural, and commercial power systems to step down voltage for end users. The substation transformer connects transmission and distribution networks, handling higher power loads with superior cooling and protection systems.
For configuration, the single-phase oil-immersed transformer is ideal for small-scale or remote power applications, while the three-phase oil-immersed transformer is preferred in industrial and utility networks for efficient energy transfer. Larger power transformers are built for grid and plant operations that require high-capacity and long-distance power transmission. Each oil-filled type ensures reliable insulation, low noise, and long service life under diverse environmental conditions.
For configuration, the single-phase oil-immersed transformer is ideal for small-scale or remote power applications, while the three-phase oil-immersed transformer is preferred in industrial and utility networks for efficient energy transfer. Larger power transformers are built for grid and plant operations that require high-capacity and long-distance power transmission. Each oil-filled type ensures reliable insulation, low noise, and long service life under diverse environmental conditions.
Strict Transformer Testing & Quality Control
At NPC Electric, we implement strict transformer testing and quality control throughout every stage of production to ensure the highest level of performance and reliability. Each distribution transformer, including oil-immersed transformers and substation transformers, undergoes rigorous electrical, mechanical, and insulation tests before delivery.
Our testing process follows international standards such as IEC, IEEE, and ANSI, covering parameters like load loss, temperature rise, insulation resistance, and oil quality. Every unit is inspected using advanced equipment and can be verified by third-party agencies like SGS or BV. With our strict transformer quality control, customers receive products that guarantee efficiency, safety, and long-term durability in any environment.
Our testing process follows international standards such as IEC, IEEE, and ANSI, covering parameters like load loss, temperature rise, insulation resistance, and oil quality. Every unit is inspected using advanced equipment and can be verified by third-party agencies like SGS or BV. With our strict transformer quality control, customers receive products that guarantee efficiency, safety, and long-term durability in any environment.
Product Show
Explore the detailed design and practical application scenarios of oil-immersed transformers
37.5kV Oil-immersed Transformers
Transformer side structure
Oil-immersed Transformers Top Structure
Transformers Top Structure
Oil-immersed Transformer
transformer oil-immersed type
Oil-immersed Transformer Warning
Transformer Warning Notes
Oil-immersed Transformer Accessories
Accessories display instructions
33kv Oil-Immersed Low Loss Power Transformer
33kv Oil-Immersed Low Loss Power Transformer
75kV Oil-immersed Transformer
Transformer exterior design
Oil-immersed Transformer Internal Structure
Transformer Internal components
Testing and Certification
Tested with precision and certified to meet international standards as
well as strict industry requirements.
Bare Cable Test Report
SGS Inspection Report
Certificate of Acceptance
ISO Quality Certificate
ISO Environmental Certificate
ISO Occupational Certificate
UL Laboratory Certificate
UL Product Certificate
Project Cases
Distribution transformers have been successfully applied in many projects and have been highly praised by customers.
Jordan Smart Factory
CompletedProvide stable and reliable power conversion solutions for the smart factory to meet diverse production needs.
Country：Jordan
Model：75kVA Oil-immersed Transformer x 14
Colombia Ocean Park
CompletedEnsure the power safety of surrounding residents and meet daily work needs
Country：Colombia
Model：33kv Oil-immersed Transformer x 30
Chile Factory
Completed22kV Oil-immersed transformers provide safe, efficient, and reliable power distribution in Chile.
Country：Chile
Model：22kv Oil-immersed Transformers x 20
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
FAQ From Customers
-
What is an oil immersed transformer and how does it work?
An oil-immersed transformer is a type of distribution transformer that uses insulating oil for both cooling and electrical insulation. The oil absorbs heat from the transformer core and windings, then dissipates it through the tank walls or radiators. This process keeps the transformer efficient, stable, and protected from electrical stress, making it suitable for residential, commercial, and substation transformer applications. -
What are the advantages of using an oil immersed transformer?
Oil-immersed transformers provide excellent cooling performance, strong insulation, and long service life. Compared to dry-type transformers, they handle higher load capacities and operate more efficiently under continuous use. Their robust design makes them ideal for power distribution networks, substations, and industrial facilities where durability and reliability are essential. -
What types of oil immersed transformers are available?
Common oil-immersed transformer types include single-phase and three-phase oil-immersed transformers. A single-phase oil-immersed transformer is typically used for small-scale or residential applications, while a three-phase oil-immersed transformer is ideal for industrial and utility networks. There are also oil-immersed distribution transformers and substation transformers designed for different voltage and power ratings. -
How should oil immersed transformers be maintained?
Regular oil-immersed transformer maintenance ensures long-term reliability and safety. Routine tasks include checking oil level and quality, testing insulation resistance, monitoring temperature, and inspecting for leaks or unusual noise. The insulating oil in an oil-cooled transformer should be tested periodically to detect moisture or contamination, which can affect performance and insulation strength. -
What standards are followed in manufacturing oil immersed transformers?
All oil-immersed transformers manufactured by NPC Electric comply with international standards such as IEC, IEEE, and ANSI. Each unit undergoes strict transformer testing and quality control, including temperature rise, load loss, and dielectric strength tests. These standards ensure that every oil-immersed distribution transformer and substation transformer operates safely, efficiently, and reliably under demanding conditions.
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