Transformers
Oil Immersed Transformer
300kVA Oil Immersed Transformer
In the field of power transmission and distribution, NPC ELECTRIC 300kVA oil-immersed transformer stands out with its excellent performance, providing reliable power support for various power consumption scenarios. The transformer is carefully wound with high-quality silicon steel sheets and electromagnetic wires, with extremely low no-load loss and load loss, which greatly improves the efficiency of power conversion and effectively reduces electricity costs. It is widely used in industrial plants, commercial centers, residential communities, infrastructure construction, and other fields to meet the power needs of different scenarios.
315kVA Oil Immersed Transformer
The 315kVA Oil Immersed Transformers are essential devices that convert electrical energy from one voltage level to another, enabling the efficient transmission and distribution of power across various systems. Oil-immersed transformers, in particular, have become industry favorites due to their superior cooling and insulation capabilities, which extend their lifespan and reduce maintenance requirements. The integration of renewable energy sources, such as wind and solar, requires transformers that can handle the variable output of these sources. 315kVA Oil Immersed Transformers are well-suited for this task due to their robustness and adaptability.
400kVA Oil Immersed Transformer
The 400kVA 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. It 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.
500kVA Oil Immersed Transformer
The 500kVA oil-immersed transformer complies with ANSI, CSA, NEMA, IEEE, IEC, GB, and DOE standards. NPC ELECTRIC'S 500kVA oil-immersed transformers have a solid core and winding construction using high-quality materials to ensure optimum performance. The core is made of cold-rolled silicon steel sheets to minimize energy loss and increase thermal stability. The windings are constructed with high-grade copper wire for excellent conductivity and heat dissipation.
630kVA Oil Immersed Transformer
NPC ELECTRIC’S 630kVA oil-immersed transformer adopts a high-efficiency and energy-saving design, complies with the IEC 60076 international standard, and ensures stable operation and long life. Its high-quality silicon steel core and high-performance insulating oil provide excellent electrical performance and heat dissipation capabilities. It is widely used in power systems, industrial parks, and commercial facilities to meet different load requirements.
750kVA Oil Immersed Transformer
NPC ELECTRIC's 750kVA oil-immersed transformer uses advanced oil-immersed cooling technology to provide efficient and stable power conversion. The transformer complies with international standards such as the International Electrotechnical Commission (IEC) and ISO 9001, ensuring the high quality and safety of the product. Its sturdy structure and excellent overload resistance are widely used in industrial, commercial, and power network fields.
800kVA Oil Immersed Transformer
The NPC ELECTRIC 800kVA Oil-Immersed Transformer is designed for high efficiency, durability, and reliable power distribution. Built to meet IEC 60076 and ANSI/IEEE standards, it ensures superior performance and safety. Certified for international quality compliance, it is ideal for industrial, commercial, and utility applications.
1000kVA Oil Immersed Transformer
NPC ELECTRIC's 1000kVA oil-immersed transformer is made of high-quality silicon steel sheets and high-quality insulation materials, with high efficiency, low loss, and long life. The product complies with international standards such as IEC 60076 and GB 1094, and has passed strict type tests and factory tests to ensure safety and reliability.
1250kVA Oil Immersed Transformer
NPC ELECTRIC's 1250kVA oil-immersed transformer adopts advanced design and manufacturing technology and complies with international power equipment standards (such as IEC, ANSI, IEEE, etc.). Its high-quality materials and strict quality control ensure the long-term reliability and safety of the equipment. The transformer has high efficiency and stable power transmission performance and is widely used in industrial, commercial, and power systems.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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