Transformers
Distribution Transformer
Optimize local power grids with our highly efficient Distribution Transformers. Designed to step down primary voltage to a level suitable for end-users, these transformers are the backbone of reliable local power distribution. Our Distribution Transformers are available in both oil-filled and dry-type configurations, in various kVA ratings and voltage classes. They feature optimized core designs and high-quality conductors to ensure minimal energy loss, superior voltage regulation, and robust overload capacity. Ideal for residential, commercial, and light industrial applications, our transformers guarantee stable and efficient power delivery, crucial for modern, responsive utility networks.
35kV Oil Immersed Transformer
NPC ELECTRIC's 35kV Oil Immersed Transformer is a premium three-phase power transformer optimized for high-voltage step-down in 50/60Hz AC systems with primary ratings of 35kV (or 33-38.5kV range). It incorporates a robust conservator or fully sealed tank design with efficient radiator cooling (ONAN standard, ONAF optional), ensuring exceptional thermal dissipation, moisture exclusion. Outdoor-rated with pollution-resistant bushings (BIL 170-200kV), Dyn11/Ynd1 vector groups, and low noise (<62dB), it provides stable 35kV to secondary voltages (e.g., 10kV/6.3kV/0.4kV) conversion, enhancing grid stability, minimizing transmission losses, and supporting demanding applications in harsh or high-altitude conditions.
44kV Oil Immersed Transformer
NPC ELECTRIC's 44kV Oil Immersed Transformer is a heavy-duty three-phase power unit tailored for efficient high-voltage to medium-voltage step-down in 50/60Hz AC grids, handling primary inputs up to 44kV (or 40-46kV variants). Built with a durable conservator-equipped tank and high-efficiency radiator system for optimal oil circulation and heat dissipation. Suitable for pole or pad-mounted installations with YNd11/Dyn1 vector groups and high BIL (200-250kV), it delivers precise 44kV to secondary levels (e.g., 11kV/13.8kV/0.69kV), optimizing power quality, reducing harmonic distortions, and facilitating seamless integration in expansive utility infrastructures.
450kVA Oil Immersed Transformer
The 450kVA Oil Immersed Transformer is a reliable three-phase distribution transformer engineered for medium-voltage step-down applications in 50/60Hz AC systems, typically with primary voltages of 11kV or 33kV (options for 6kV/10kV/20kV) and secondary at 0.4kV/0.415kV/0.433kV. High-grade cold-rolled grain-oriented silicon steel core with low-loss lamination reduces no-load losses, while copper or aluminum windings paired with premium mineral oil minimize load losses and enable ONAN cooling for strong overload capacity. Compliant with IEC 60076, GB/T6451, and energy efficiency standards (e.g., S11/S13 series), it achieves high overall efficiency (>98-99%) at typical loads, low noise (<55dB), and reduced total ownership costs for residential, commercial, and light industrial power distribution.
600kVA Oil Immersed Transformer
The 600kVA Oil Immersed Transformer is a robust three-phase distribution transformer designed for reliable medium-voltage power step-down in 50/60Hz AC networks, commonly with primary voltages of 11kV or 33kV. Utilizing premium grain-oriented silicon steel core (S11/S13 series) to achieve reduced no-load losses, copper or aluminum windings, and high-quality mineral oil , it minimizes load losses while providing ONAN cooling for substantial overload tolerance (up to 140% short-term). Compact design with Dyn11 vector group, BIL ratings, and pole/ground-mount flexibility ensures dependable performance, minimal energy dissipation, and seamless integration in modern distribution systems.
700kVA Oil Immersed Transformer
The 700kVA Oil Immersed Transformer is a high-performance three-phase distribution transformer optimized for dependable medium-voltage power conversion in 50/60Hz AC grids, featuring primary ratings of 11kV or 33kV and secondary at 0.4kV/0.415kV/0.433kV. It adopts a fully hermetically sealed corrugated tank construction for automatic volume compensation, delivering outstanding resistance to humidity ingress, corrosion. Incorporating low-loss grain-oriented silicon steel core (S11/S13 series compliant) for minimized no-load losses (typically 950-1300W), high-conductivity copper windings, and premium-grade mineral insulating oil (IEC 60296 certified, dielectric >55kV/2.5mm).
3000kVA Oil Immersed Transformer
The 3000kVA Oil Immersed Transformer is a high-capacity three-phase power distribution transformer engineered for heavy-duty medium- to high-voltage step-down. Premium high-permeability cold-rolled grain-oriented silicon steel core (S13/S18 series level) significantly reduces no-load losses (typically 3500–4800W), while high-conductivity copper windings and superior mineral or ester insulating oil (IEC 60296/IEC 61099 compliant, dielectric >60kV/2.5mm) achieve low load losses (around 22–28kW at 75°C), ONAN/ONAF cooling capability for sustained overloads (up to 150–180% short-term), noise levels <65dB, and peak efficiency >99%. Conforming to energy efficiency regulations, this transformer delivers substantial energy savings, reduced transmission losses, and dependable performance in industrial, utility, and renewable applications.
3150kVA Oil Immersed Transformer
3150kVA Oil Immersed Transformer is a high-capacity three-phase power transformer optimized for efficient voltage transformation in 50/60Hz AC medium-voltage networks, with primary ratings commonly at 11kV, 22kV, 33kV, or 35kV (adaptable to 10–38.5kV) and secondary at 0.4kV, 0.69kV, 6.3kV, 10kV, or 11kV. Employing advanced high-permeability grain-oriented silicon steel core (S13/S20 series compliant) for dramatically reduced no-load losses (typically 3200–5400W), high-purity copper windings, and premium insulating oil (IEC 60296 compliant, dielectric >60kV/2.5mm), it achieves low load losses (around 18–22kW at 75°C), strong overload capability (up to 150–180% short-duration), noise below 65dB, and efficiency exceeding 99%.This transformer minimizes operational expenses, transmission losses, and environmental impact in large-scale industrial, utility, and renewable setups.
4000kVA Oil Immersed Transformer
4000kVA Oil Immersed Transformer is designed for medium and large-scale power distribution systems that require high reliability, strong overload capacity, and long-term stable operation. The transformer adopts a fully sealed oil-immersed structure, effectively preventing moisture ingress and oil oxidation, thereby extending service life and reducing maintenance frequency. The transformer features excellent thermal performance and robust insulation strength, ensuring stable operation under continuous load or fluctuating grid conditions. Advanced oil circulation and cooling structure enhance heat dissipation, while precise manufacturing processes guarantee low noise and high mechanical strength.
5000kVA Oil Immersed Substation Transformer
The 5000kVA Oil Immersed Substation Transformer is engineered for high-capacity power substations that demand continuous stability, strong load adaptability, and long operational life. Featuring an advanced oil-immersed insulation system, the transformer effectively enhances dielectric strength and thermal conductivity, ensuring reliable performance under heavy and fluctuating load conditions. With superior short-circuit withstand capability and efficient cooling performance, the transformer provides dependable power conversion for substations serving industrial, commercial, and infrastructure applications.In-Depth Analysis
Distribution 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
Distribution 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 Distribution transformers — from oil-immersed transformers and substation 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.
Substation Transformers Manufacturer
As a trusted substation transformer manufacturer, NPC Electric provides high-quality transformer solutions designed for reliable power distribution and grid integration. Our substation transformers are engineered for superior performance, efficiency, and safety — ideal for power plants, substations, and large-scale industrial facilities.
We manufacture a wide range of power transformers and distribution transformers, including oil-immersed substation transformers built to meet IEC, IEEE, and ANSI standards. With advanced production technology, strict quality testing, and customized voltage configurations, NPC Electric ensures stable operation, minimal energy loss, and long service life. As a professional substation transformer manufacturer, we are committed to delivering dependable products and technical support to customers worldwide.
We manufacture a wide range of power transformers and distribution transformers, including oil-immersed substation transformers built to meet IEC, IEEE, and ANSI standards. With advanced production technology, strict quality testing, and customized voltage configurations, NPC Electric ensures stable operation, minimal energy loss, and long service life. As a professional substation transformer manufacturer, we are committed to delivering dependable products and technical support to customers worldwide.
Distribution Transformer Installation
NPC Electric provides professional distribution transformer installation services to ensure safe, efficient, and reliable power delivery for every project. Our experienced engineering team manages the full installation process — from design consultation and site preparation to final commissioning. Whether you require an oil-immersed transformer for urban distribution or a substation transformer for industrial or utility applications, we deliver precise and compliant installation according to IEC and IEEE standards.
Each distribution transformer installation is performed with strict safety controls and advanced testing procedures to guarantee long-term stability and performance. NPC Electric also offers ongoing distribution transformer maintenance and technical support to help customers achieve continuous, trouble-free operation.
Each distribution transformer installation is performed with strict safety controls and advanced testing procedures to guarantee long-term stability and performance. NPC Electric also offers ongoing distribution transformer maintenance and technical support to help customers achieve continuous, trouble-free operation.
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 distribution transformers
10kv Oil-immersed Transformers
10kv oil-immersed transformers shows
20kv Oil-immersed Transformers
20kv oil-immersed transformers shows
Oil-immersed Type Transformer
transformer oil-immersed type
100kva Oil-immersed Transformer
100kva transformer top structure
1000kva Substation Transformer
1000kva substation transformer front structure
Substation Power Transformer
substation power transformer structure
Substation Transformers
transformer and substation
HV Bushing LV Bushing
transformer HV Bushing LV Bushing
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
Guyana Power & Light Inc
CompletedEnsure the power safety of surrounding residents and meet daily work needs
Country：Guyana
Model：13.8kV - 0.48Y/0.22kV, 3MVA Substation Transformer x 5
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 a distribution transformer and how does it work?
A distribution transformer is used to step down high voltage electricity from the power grid to a lower voltage suitable for residential, commercial, or industrial use. It plays a critical role in local power networks by ensuring safe and efficient energy delivery. Common types include the oil-immersed transformer and the substation transformer, both designed for reliable voltage conversion and long service life. -
What is the difference between an oil immersed transformer and a substation transformer?
An oil-immersed transformer uses insulating oil for cooling and insulation, making it ideal for outdoor or high-load applications. A substation transformer, on the other hand, is usually installed within a power substation to manage voltage transformation between transmission and distribution systems. Both types are essential components of a distribution transformer network. -
How do I choose the right distribution transformer for my project?
When selecting a distribution transformer, consider factors such as power capacity (kVA rating), voltage requirements, cooling method, and installation environment. For rural or residential networks, an oil immersed transformer may be ideal, while industrial or utility projects often require a substation transformer for higher capacity and grid integration. Consulting a professional distribution transformer manufacturer ensures optimal performance and safety. -
What standards are followed in manufacturing distribution transformers?
All distribution transformers produced by NPC Electric comply with international standards, including IEC, IEEE, and ANSI. Each oil-immersed transformer and substation transformer undergoes strict testing for insulation resistance, temperature rise, and load loss to guarantee safety, efficiency, and durability. These quality control measures ensure reliable operation under diverse environmental conditions. -
How often should a distribution transformer be inspected or maintained?
Regular distribution transformer maintenance is essential for long-term performance. It is recommended to inspect oil-immersed transformers every 6–12 months for oil quality, temperature, and insulation status. Substation transformers should also undergo preventive testing, such as dielectric strength and load checks, to prevent power outages and extend service life. -
Can NPC Electric provide installation and after-sales support for distribution transformers?
Yes. As a professional distribution transformer manufacturer, NPC Electric offers complete transformer installation, commissioning, and technical support services. Our team ensures that every oil-immersed transformer and substation transformer is properly installed, tested, and maintained according to global standards. We also provide long-term service contracts to ensure stable and efficient operation.
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