Transformers
Conventional Type Single Phase Pole Mounted Transformer
NPC ELECTRIC utilizes state-of-the-art technology, supported by ISO-9001 certified processes and quality assurance programs, to design and manufacture a complete line of single-phase pole-type distribution transformers for utility overhead systems. These transformers, known for their high reliability, are available in a wide range of ratings and accessory combinations, ensuring that you receive cost-effective products perfectly matched to your system requirements.The transformer is capable of operating at a voltage level of up to 34.5 kV, with a maximum power capacity of 167kVA.
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
Pole mounted 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
Pole mounted 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 Pole mounted transformers are trusted worldwide for efficiency, safety, and reliability.
Proven Reliability & Decades of Performance
NPC Electric Conventional Single Phase Pole Mounted Transformers offer proven reliability, backed by decades of field performance as the backbone of single-phase power distribution. Built on time-tested designs, these oil-immersed transformers consistently deliver stable voltage and efficient operation in a wide array of climates and conditions. Their robust construction and straightforward design minimize potential points of failure, ensuring a long operational lifespan with minimal intervention. By choosing our reliable pole-mounted units, utilities invest in a trusted technology that guarantees a continuous, high-quality power supply to residential homes and rural areas, ensuring dependable service for communities.
Highly Cost-Effective & Easy to Install
NPC Electric Conventional Single Phase Pole Mounted Transformers are a highly cost-effective solution with a reputation for ease of installation. Their standardized design and well-understood mounting procedures significantly reduce labor costs and project timelines compared to more complex alternatives. This makes them ideal for rapid deployment in new residential areas or for efficient replacement in existing overhead distribution networks. The initial investment is typically lower, and their robust construction ensures reduced maintenance expenditures over time. By deploying our economical single-phase transformers, utilities optimize budgets while ensuring widespread and reliable power access.
Efficient Energy Conversion with Low Losses
Our Conventional Single Phase Pole Mounted Transformers are engineered for efficient energy conversion with low losses, contributing to a more sustainable and economical power grid. Optimized core designs and high-quality windings minimize both no-load and load losses during the voltage step-down process. This superior efficiency ensures that more of the generated electricity reaches the end-user, reducing wasted energy and lowering operational costs for utilities. By investing in our energy-efficient single-phase transformers, you enhance the overall performance of your power distribution network while minimizing environmental impact and maximizing the value of every unit of electricity.
Robust & Weather-Resistant Construction
NPC Electric Conventional Single Phase Pole Mounted Transformers feature robust and weather-resistant construction, ensuring dependable performance in even the most challenging outdoor conditions. The durable tank design protects the internal oil-immersed core and windings from moisture, dust, and extreme temperatures. Built to withstand high winds, heavy rain, and corrosive atmospheres, these transformers offer sustained operational integrity year after year. This resilience minimizes the need for frequent repairs or early replacements, contributing to lower lifecycle costs and uninterrupted service. Trust our durable single-phase transformers to reliably deliver power, regardless of the environmental challenges they face.
Product Show
Explore the detailed design and practical application scenarios of pole mounted transformers
Pole Mounted Transformer Side
Transformer side structure
10kVA Pole Mounted Transformer
10kva transformer font view
Pole Mounted Transformer Design
transformer font design
Pole Mounted Transformer Back
transformer back design
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
Pole mounted transformers have been successfully applied in many projects and have been highly praised by customers.
Mexico Residential Area
CompletedProvide stable and reliable power conversion solutions for the smart factory to meet diverse production needs.
Country：Mexico
Model：20kVA Pole Mounted Transformer x 2
Guyana Data Center
CompletedEnsure the power safety of surrounding residents and meet daily work needs
Country：Guyana
Model：167kVA Pole Mounted Transformer x 15
Colombia Factory
CompletedNPC transformers provide safe, efficient, and reliable power distribution in Surinam.
Country：Colombia
Model：75kVA Pole Mounted Transformer x 10
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
FAQ From Customers
-
What are pole mounted transformers filled with?
Most pole mounted transformers are oil immersed transformers filled with insulating mineral oil or synthetic ester fluid. The oil serves two main purposes — it provides insulation between internal components and helps dissipate heat generated during operation. Some eco-friendly designs use biodegradable natural ester fluids for improved fire safety and environmental protection. Regular oil testing ensures the distribution transformer maintains optimal performance and long service life. -
What is a pole mounted recloser?
A pole mounted recloser is an automatic, high-voltage electrical switch installed alongside a pole mounted transformer to protect power lines from faults. When a short circuit or overload occurs, the recloser interrupts the flow of electricity and automatically restores power after a short delay. This reduces outages and improves grid reliability in overhead distribution transformer networks. Reclosers are essential for modern rural and urban power systems that rely on pole mounted transformers. -
What is the largest pole mounted transformer?
The largest pole mounted transformers typically range up to 500 kVA or more, depending on regional standards and pole load capacity. Larger-capacity three phase pole mounted transformers are designed for industrial or community-scale power distribution. However, most utilities prefer sizes under 300 kVA for safety, weight, and installation reasons. NPC Electric can design and manufacture custom high-capacity pole mounted transformers to meet specific voltage and kVA requirements. -
What is a three-phase transformer?
A three phase transformer is used to transfer electrical energy in three phase power systems, which are common in industrial, commercial, and large-scale distribution networks. Compared with a single phase transformer, a three phase pole mounted transformer delivers higher efficiency, balanced load distribution, and greater power capacity. It is often installed on poles or in substations as part of the distribution transformer network to step down high transmission voltages. -
Do transformers convert AC to DC?
No, transformers do not convert AC to DC. A transformer only changes the voltage level of alternating current (AC), stepping it up or down as needed. To convert AC to DC, additional electronic components such as rectifiers are required. For example, a pole mounted transformer may step down the AC voltage from 11kV to 415V, and then a rectifier or converter can change that AC output into DC for specific applications.
Welcome your inquiry
Honesty, Integrity, Frugality, Activeness and Passion