Transformers
Transformers
Discover our comprehensive range of high-performance Transformers, engineered for reliable power distribution across diverse applications. We offer a full spectrum, including robust Pad Mounted Transformers for secure underground systems, efficient Distribution Transformers for utility grids, and space-saving Pole Mounted Transformers for overhead lines. For sensitive indoor environments, our Dry Type Transformers deliver exceptional safety without liquid coolants. Completing our lineup are powerful Power Transformers, vital for bulk energy transmission. Featuring advanced insulation (oil-filled or cast resin), optimized core designs, and adherence to international standards, our transformers ensure minimal energy loss, optimal voltage regulation, and long-term operational stability for industrial, commercial, and utility sectors.
30kVA Single Phase Pole Mounted Transformer
NPC Electric's 30kVA Single Phase Pole Mounted Transformer is a compact, high-efficiency single-phase distribution transformer designed for overhead pole installation in 50/60Hz AC rural and suburban networks, with primary voltages up to 35kV (common 12.47kV/13.2kV/13.8kV/34.5kV) and secondary at 120/240V or 240/480V split-phase. It utilizes a hermetically sealed cylindrical tank with high-strength steel construction and radiator fins for natural oil circulation (ONAN cooling), providing excellent thermal management, corrosion resistance via epoxy coatings, and a maintenance-free lifespan over 25 years. Featuring low-loss grain-oriented silicon steel core for reduced no-load losses (typically 100-150W), high-purity copper windings, and premium mineral insulating oil (IEC 60296 compliant, dielectric strength >45kV/2.5mm), it minimizes load losses (around 500-700W at 75°C), supports overloads up to 125% continuous, operates quietly (<50dB), and achieves efficiency >98.5%. Compliant with IEEE C57.12.20, ANSI C57.12.28, DOE efficiency standards, and CSA C2.1, this transformer optimizes energy distribution, lowers operational costs, and enhances reliability for single-phase residential, farm, and light commercial loads.
150kVA Single Phase Pole Mounted Transformer
NPC ELECTRIC'S 150kVA single phase pole mounted transformer is engineered for superior performance in overhead electrical distribution networks. This robust unit efficiently steps down high-voltage primary inputs, such as 13.8kV or 24.94kV, to secondary voltages like 120/240V or 277V, ensuring safe and reliable power delivery. Built with high-permeability toroidal cores and precision-wound copper conductors, it minimizes energy losses and enhances durability. Compliant with DOE-2016 efficiency standards and featuring a NEMA 3R-rated enclosure, this transformer withstands harsh environmental conditions while providing quiet operation. Ideal for utilities seeking long-term reliability, it includes protective features like surge arrestors and pressure relief valves to safeguard against overloads and faults. With a 65°C temperature rise rating and ONAN cooling, it handles diverse loads without compromising efficiency.
200kVA Single Phase Pole Mounted Transformer
NPC ELECTRIC'S 200kVA single phase pole mounted transformer delivers exceptional reliability for demanding overhead power systems. It efficiently converts primary voltages like 11kV or 22kV to secondary levels such as 220V or 400V, supporting heavier loads in diverse environments. Constructed with low-loss grain-oriented steel cores and high-grade aluminum conductors, it achieves superior energy efficiency and reduced operational costs. Meeting ANSI/IEEE C57 standards, the weatherproof enclosure ensures protection against elements, with a 55°C temperature rise and ONAF cooling for enhanced performance. Essential safety integrations include overload fuses and oil level gauges, making it suitable for utilities aiming for minimal downtime. This transformer excels in providing stable power with low harmonic distortion, ideal for modern grid upgrades.
250kVA Single Phase Pole Mounted Transformer
Engineered for heavy-duty overhead applications, the 250kVA single phase pole mounted transformer provides dependable voltage transformation from primary levels like 12.47kV, 24.94kV, or 34.5kV to secondary outputs such as 120/240V or 277/480V. Featuring grain-oriented silicon steel cores for minimal core losses and robust windings, it achieves high efficiency while adhering to DOE energy standards and IEEE C57.12.20 guidelines. The corrugated tank design promotes superior heat dissipation, paired with ONAN self-cooling and a 65°C temperature rise for sustained performance under peak demands. Weather-resistant construction includes lifting lugs, pressure relief devices, and surge protection options, ensuring longevity in exposed environments. This transformer minimizes maintenance needs and supports stable power supply with low noise and excellent overload capability, making it a preferred choice for expanding grid infrastructure.
333kVA Single Phase Pole Mounted Transformer
NPC ELECTRIC'S 333kVA single phase pole mounted transformer stands as a powerhouse solution for intensive overhead distribution requirements, effectively reducing primary voltages such as 12.47kV, 24.94kV, or 34.5kV to secondary voltages including 120/240V, 277V, or 347V. Crafted with premium grain-oriented silicon steel cores and durable windings, it delivers outstanding energy efficiency, low losses, and compliance with modern DOE efficiency regulations alongside IEEE C57 and ANSI standards. The tank incorporates corrugated fins for optimal natural oil circulation (ONAN), supporting a 65°C temperature rise and robust overload handling. Equipped with essential protections like pressure relief valves, high-voltage bushings, and surge arresters, this transformer ensures dependable operation in exposed conditions. Its design prioritizes quiet performance, minimal maintenance, and extended service life, making it highly suitable for utilities managing substantial single-phase loads in evolving power networks.
11kV Single Phase Pole Mounted Transformer
The 11kV single phase pole mounted transformer is a compact, high-performance solution for overhead distribution systems, stepping down 11kV primary voltage to standard secondary levels like 230V, 240V, or 415V for safe end-user supply. Built with high-grade silicon steel cores and copper or aluminum windings, it minimizes core and copper losses while meeting IEC 60076 and relevant IEEE/ANSI standards for energy efficiency. The oil-immersed tank with ONAN natural cooling supports a 55-65°C temperature rise, ensuring reliable operation under varying loads. Features include robust bushings, pressure relief mechanisms, and optional surge protection, making it weather-resistant and low-maintenance for exposed pole installations. This transformer excels in providing stable, low-distortion power with excellent overload tolerance, perfect for utilities expanding access in diverse terrains.
33kV Single Phase Pole Mounted Transformer
Designed for medium-voltage overhead systems, the 33kV single phase pole mounted transformer efficiently steps down primary voltages of 33kV (or 34.5kV variants) to secondary levels such as 230V, 240V, or 415V, serving substantial single-phase loads in extended networks. Constructed with advanced grain-oriented silicon steel cores and precision windings, it achieves minimal no-load and load losses while fully complying with IEC 60076 and IEEE C57 requirements. The oil-immersed tank with ONAN cooling maintains a 65°C temperature rise, supporting reliable performance during peak demands and harsh weather exposure. High insulation levels, including 150-200kV BIL on the HV side, combined with pressure relief valves, HV bushings with arcing horns, and optional surge arresters, provide exceptional protection against lightning and overvoltages. This transformer offers quiet operation, strong overload capacity, and extended service life, making it essential for utilities optimizing power access in remote or growing areas.
Three Phase Pole Mounted Transformer
The three phase pole mounted transformer delivers balanced, high-capacity power transformation for overhead distribution lines, stepping down medium voltages such as 11kV, 22kV, or 33kV to low voltages like 400V/415V or 480V in Y or Delta configurations. Engineered with a five-legged core/coil assembly and premium grain-oriented silicon steel, it reduces magnetic losses and harmonics while achieving high efficiency levels per DOE and IEC standards. The oil-immersed tank with ONAN cooling ensures effective heat dissipation and a 65°C rise rating for continuous operation under demanding loads. Robust features include porcelain HV bushings, polymer LV bushings, tin-plated terminals for copper/aluminum connections, pressure relief devices, and lightning arrester provisions, offering excellent weather resistance and protection in exposed installations. This design provides cleaner aesthetics, lower installation costs compared to single-phase banks, and reliable service for motor starts and variable loads, making it a top choice for utilities modernizing grids.In-Depth Analysis
NPC Electric 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, they provide a sustainable and innovative solution for today’s and tomorrow’s power needs.
Comparative Analysis of Efficiency and Loss
Compared to the industry average, NPC 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
+25%
Reduced Iron Loss
-30%
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
98%
Environmental Adaptability Analysis
NPC 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
As a trusted partner in energy savings and the development of green energy solutions, NPC Electric has played a pioneering role in the development of national smart grids across multiple regions.
Transformer Manufacturer
With over 30 years of manufacturing experience, we specialize in delivering reliable and efficient transformer solutions.
Our product portfolio includes Pad Mounted Transformers, Power Transformers, Dry Type Transformers, Pole Mounted Transformers, Oil-immersed Transformer, Substation Transformer and Distribution Transformers, serving diverse applications with proven quality and innovation.
NPC ELECTRIC is committed to providing partners with high-quality, high-performance, and high-reliability transformers.
Our product portfolio includes Pad Mounted Transformers, Power Transformers, Dry Type Transformers, Pole Mounted Transformers, Oil-immersed Transformer, Substation Transformer and Distribution Transformers, serving diverse applications with proven quality and innovation.
NPC ELECTRIC is committed to providing partners with high-quality, high-performance, and high-reliability transformers.
Transformer Installation
NPC Electric’s skilled engineers offer full-cycle support—from design consultation and technical drawings to on-site guidance and after-sales service—ensuring peace of mind at every stage of the project.
We have a technical team of over 60 members and more than 100 after-sales engineers, ready to assist customers with installation and on-site support. Till now, we have provided professional engineering services in countries such as Mongolia, Honduras, Peru, and Rwanda. Our services include winding resistance testing, oil testing, and installation support.
We have a technical team of over 60 members and more than 100 after-sales engineers, ready to assist customers with installation and on-site support. Till now, we have provided professional engineering services in countries such as Mongolia, Honduras, Peru, and Rwanda. Our services include winding resistance testing, oil testing, and installation support.
Transformer Testing
NPC Electric uses high-quality raw materials and advanced production processes, supported by strict quality control systems. Our products meet or exceed international standards such as IEC, UL, and ISO, ensuring safety, reliability, and long service life. All our cables are subject to third-party laboratory testing—such as by SGS, DNV, or witnessed directly by customers—to ensure compliance and performance.
Efficient Logistics & Timely Delivery
With over 4,200 square meters of strategically located warehouse space across China, we guarantee timely delivery and flexible logistics to meet tight global project schedules. We utilize specialized transportation teams across land, sea, and air to assist with shipping your products. We can arrange shipping on EXW, CIF, FOB, FCA, CIP, or any other terms requested by the client.
Product Show
Explore the detailed design and practical application scenarios of NPC transformers
Pad Mounted Transformer
Pad Mounted Transformer Design
3 Phase Transformer
Transformer Internal Structure
NPC Earth Transformer
Safe and reliable
Oil Immersed Transformer
Lightweight and compact with superior performance
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
NPC transformers have been successfully applied in many projects and have been highly praised by customers.
Mongolia Industrial Park
CompletedProvide stable and reliable power conversion solutions for industrial parks to meet diverse production needs.
Country：Mongolia
Model：Three Phase Pad Mounted Transformer x 8
Dominican Factory
CompletedEnsure power security in nearby industrial parks and meet diverse needs
Country：Dominican
Model：NPC 450KV Power Transformer x 4
Dominican Electricity
CompletedDry-type transformers provide safe, efficient, and reliable power distribution in Dominican .
Country：Dominican
Model：NPC Dry Type Transformer x 6
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
FAQ From Customers
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What types of transformers do you manufacture?
We provide a full range of transformers including pad mounted transformers, power transformers, dry type transformers, pole mounted transformers, and distribution transformers, etc. -
How do your transformers ensure safety and reliability?
NPC transformers are built with advanced insulation systems, strict quality control, and international standard certifications, ensuring long-term safe and stable performance. -
Can transformers be customized for specific applications?
Yes. We offer customized designs to meet unique requirements in renewable energy, industrial, utility, and commercial applications. -
What is the typical service life of your transformers?
With proper maintenance, our transformers are designed for a service life of 25–30 years or more, ensuring reliable operation with minimal downtime. -
Do you provide after-sales service and technical support?
Absolutely. We offer comprehensive after-sales service, including installation guidance, maintenance support, and technical consultation.
Welcome your inquiry
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