Transformers
Power Transformer
Facilitate efficient bulk power transmission with our high-performance Power Transformers. As critical components of large-scale power grids, these transformers are engineered for robust operation in generating stations, transmission substations, and industrial main power supply. Our Power Transformers are available in a vast range of MVA ratings and ultra-high voltage classes, typically using oil-filled designs for optimal cooling and dielectric strength. They ensure minimal energy loss, precise voltage regulation, and superior operational stability, crucial for national and international grid interconnections. Trust our compliant, durable, and custom-engineered solutions for your most demanding power infrastructure projects.
5MVA / 6.3MVA 35kV Three-Phase Oil-Immersed Step-Down Power Transformer
The 5MVA / 6.3MVA 35kV Three-Phase Oil-Immersed Step-Down Power Transformer is designed for reliable voltage reduction in medium-voltage power distribution systems. Built with high-grade silicon-steel cores, premium copper windings, and advanced oil-immersed cooling, it delivers low losses, strong short-circuit resistance, and stable thermal performance. The transformer features robust insulation, durable tank construction, and precision-engineered components to ensure long operational life. Suitable for industrial plants, utility substations, renewable energy facilities, and commercial power distribution, it supports both on-load and off-load tap changers for accurate voltage regulation. Engineered in compliance with IEC standards, this 35kV step-down transformer ensures high efficiency, dependable performance, and safe power delivery under various environmental and load conditions.
37kV 10000kVA(10MVA) Three Phase Duplex Winding Oil Immersed Power Transformer
The 37kV 10000kVA (10MVA) Three Phase Duplex Winding Oil Immersed Power Transformer is designed for high-reliability medium-voltage distribution and industrial applications. Featuring 99.95% electrolytic copper duplex windings, advanced ONAN/ONAF cooling, and ±8×1.25% on-load tap changer (optional), it delivers ultra-low no-load and load losses (S11/S13 series). Fully compliant with IEC 60076, GB/T 1094, and ANSI/IEEE standards, it withstands 170–200 kV lightning impulse and PD <10 pC. Corrugated tank or detachable radiator design ensures excellent heat dissipation and mechanical strength. Standard voltages 37±8×1.25%/11kV, 37/6.3kV or custom. Vacuum oil processing and nitrogen sealing guarantee 30+ years service life with minimal maintenance. Trusted by utilities, EPCs, and heavy industries worldwide.
40kV 50MVA Oil Immersed Three-Phase MV&HV Power Transformer Copper
The 40kV 50MVA Oil Immersed Three-Phase MV&HV Power Transformer Copper is engineered for large-scale transmission and industrial substations. Equipped with high-purity copper windings, ONAN/ONAF cooling, and ±8×1.25% on-load tap changer, it achieves ultra-low losses (S13/S14 series). Fully compliant with IEC 60076 and GB/T 1094, it withstands 200 kV lightning impulse and PD <10 pC. Robust corrugated-fin tank with detachable radiators ensures excellent thermal performance under continuous heavy load. Typical voltages: 40±8×1.25%/11kV or 40/6.3kV. Vacuum oil filling and nitrogen sealing guarantee 35+ years of reliable, maintenance-free operation in harsh environments. Trusted by utilities and EPC contractors worldwide.
45kV 2500kVA Weatherproof & Oven-Proof Oil-Immersed Power Transformer
The 45kV 2500kVA Weatherproof & Oven-Proof Oil-Immersed Power Transformer is engineered for demanding outdoor applications requiring high durability, stable voltage transformation, and long-term operational reliability. Designed with premium cold-rolled silicon steel, high-conductivity copper windings, and a reinforced oil-immersed cooling system, the transformer ensures excellent thermal stability and resistance to overheating. Its oven-proof construction allows the unit to withstand high ambient temperatures, while the weatherproof enclosure provides protection against rain, dust, humidity, and corrosive environments. With advanced insulation, strong short-circuit endurance, and compatibility with both off-load and on-load tap changers, this 45kV outdoor transformer is ideal for substations, industrial facilities, renewable energy sites, and long-distance power distribution systems. Built in accordance with IEC 60076 standards, it delivers efficiency, reliability, and lifespan required for critical grid infrastructure.
50kV 1000kVA Outdoor Three-Phase Oil-Immersed Power Transformer for Distribution
The 50kV 1000kVA Outdoor Three-Phase Oil-Immersed Power Transformer for Distribution is engineered to deliver high efficiency, stable voltage regulation, and long-term service reliability in medium-voltage distribution networks. Designed for outdoor installation, the transformer features a robust oil-immersed cooling system, high-grade silicon steel core, and pure copper windings to ensure excellent thermal performance and low-loss characteristics. Its rugged, weatherproof construction withstands harsh climates, ensuring continuous operation in industrial plants, utility grids, mining sites, and renewable energy distribution stations. With optimized insulation, superior dielectric strength, and advanced protection configurations, the transformer offers enhanced safety and reduced maintenance. This unit is ideal for step-down power distribution scenarios requiring consistent performance and dependable energy delivery.
55kV 1600kVA Three Phase Oil Immersed Power Transformer Copper
The 55kV 1600kVA Three Phase Oil Immersed Power Transformer Copper is designed for reliable medium/high-voltage distribution networks. It adopts 99.95 % electrolytic copper windings, Class A insulation, a corrugated-fin tank, and ONAN cooling for excellent heat dissipation. Available in energy-saving S11/S13 series with no-load loss reduced by up to 35 %. Fully sealed or conservator type prevents oil aging. Equipped with ±5 % or ±2×2.5 % off-circuit tap changer (on-load optional). Meets IEC 60076, GB/T 1094 standards, lightning impulse withstand 250 kV peak, PD <10 pC. Low noise (<58 dB), strong short-circuit strength, suitable for harsh environments. Vacuum oil filling + nitrogen sealing ensures a 30+ year lifespan. Widely trusted in mining, petrochemical, renewable energy, and urban 55 kV substations.
60kV Dyn11/Yyn0 Pure Copper Oil-Immersed Power Transformer
The 60kV Dyn11/Yyn0 Pure Copper Oil-Immersed Power Transformer is designed for regional 35–50 kV distribution networks and industrial substations. It adopts 99.99 % electrolytic pure copper windings, Class A insulation, corrugated tank + ONAN natural cooling, and energy-saving S11/S13 core with up to 40 % lower no-load loss. Standard vector groups Dyn11 or Yyn0, off-circuit tap changer ±5 % or ±2×2.5 % (on-load optional). Fully compliant with IEC 60076, lightning impulse 250 kV peak, PD <10 pC. Fully sealed or conservator design prevents oil aging and moisture ingress. Low noise ≤58 dB, strong short-circuit withstand, suitable for high-altitude and harsh environments. Vacuum oil filling + nitrogen sealing ensures>30-year lifespan. Widely used in mining, petrochemical, renewable energy, and urban 50 kV networks.
65kV Three-Phase Oil-Immersed Power Transformer with No-Load Voltage Regulation
The 65kV Three-Phase Oil-Immersed Power Transformer with No-Load Voltage Regulation is engineered for medium-to-high voltage distribution systems requiring stable performance and precise voltage control. Equipped with a no-load tap changer, the transformer allows flexible adjustment of voltage ratios to meet varying grid demands. Its high-grade silicon steel core and oxygen-free copper windings ensure low losses, superior thermal efficiency, and long operational life. The oil-immersed cooling system provides enhanced heat dissipation, while the durable outdoor-rated tank structure enables reliable operation in harsh climatic environments. Designed in compliance with IEC, IEEE, and GB standards, this transformer is widely used in utility substations, industrial power networks, renewable energy stations, and large commercial distribution systems. It delivers consistent voltage regulation, strong overload capability, and dependable long-term grid support.
70kV 8000kVA Copper-Wound Oil-Immersed Power Transformer for High-Voltage Distribution
The 70kV 8000kVA Copper-Wound Oil-Immersed Power Transformer for High-Voltage Distribution is designed to deliver robust performance in demanding grid environments. Featuring 100% oxygen-free copper windings, the transformer ensures superior electrical conductivity, reduced losses, and enhanced overload capability. Its oil-immersed cooling system provides excellent heat dissipation, maintaining long-term stability under high-load and continuous operation conditions. The high-grade silicon steel core minimizes noise and magnetic losses, improving overall efficiency. The transformer’s reinforced tank, durable insulation system, and outdoor-ready structure enable reliable operation in harsh climates, industrial zones, and high-temperature regions. Compliant with IEC, IEEE, and GB standards, this transformer supports utility substations, industrial power networks, renewable energy integration, and high-voltage distribution systems, ensuring safe, efficient, and uninterrupted power delivery.In-Depth Analysis
Power 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
Power 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 power transformers are trusted worldwide for efficiency, safety, and reliability.
Power Transformers Manufacturer
NPC Electric is a trusted power transformer manufacturer dedicated to delivering reliable and efficient power solutions for utility, industrial, and renewable energy sectors. Our range of power transformers includes oil-immersed power transformers, dry type power transformers, and substation transformers, designed to handle high voltage transmission and large-capacity distribution.
Each unit is engineered for maximum efficiency, low losses, and long service life. As a leading transformer manufacturer, NPC Electric adheres to international standards such as IEC, IEEE, and ANSI, ensuring global compatibility and safety. With advanced production facilities, strict quality control, and custom design capabilities, we provide high-performance three-phase power transformers tailored to diverse grid and project requirements. Choose NPC Electric for dependable power transformation and sustainable energy solutions worldwide.
Unrivaled Reliability & Robust Durability
NPC Electric Power Transformers offer unrivaled reliability and boast a robust design, specifically built for continuous, heavy-duty operation within demanding high-voltage environments. Each transformer undergoes stringent quality control and testing, utilizing premium insulation materials, advanced cooling systems (e.g., ONAN, ONAF, OFAF), and durable construction techniques. This ensures exceptional mechanical strength and a high short-circuit withstand capability, minimizing the risk of failures and extending operational lifespan. By choosing our reliable power transformers, you secure the unwavering stability and uninterrupted power flow essential for the backbone of any modern electrical grid infrastructure.
Stable Voltage & Grid Performance
Our Power Transformers provide superior voltage regulation, crucial for maintaining grid stability and ensuring high-quality power delivery across vast distances. Equipped with advanced tap changers (both On-Load Tap Changer (OLTC) and Off-Circuit Tap Changer (OCTC) options), these transformers precisely adjust output voltage to compensate for load fluctuations and system imbalances. This capability minimizes voltage sags or swells, protecting sensitive equipment and ensuring consistent power quality for industrial, commercial, and residential consumers. By integrating our stable power transformers, you optimize the performance and responsiveness of your transmission and distribution networks, securing a robust foundation for modern power systems.
Custom Solutions for Diverse Needs
We specialise in providing custom-engineered solutions for Power Transformers, catering to the diverse and complex requirements of various high-voltage applications. Our expert team collaborates closely with clients to design transformers with specific ratings, impedance values, cooling configurations, and auxiliary equipment. Whether for new substation projects, grid expansion, or renewable energy integration, we deliver tailored designs that optimise performance, space utilisation, and cost-effectiveness. By choosing our custom power transformers, you gain a purpose-built solution that perfectly integrates into your unique electrical infrastructure, ensuring peak performance and future scalability for your critical power needs.
Product Show
Explore the detailed design and practical application scenarios of power transformers
220kV Electrical Transformer
220kV transformer product show
350kV Power Transformer
350kV transformer product completed
Step Up Power Transformer
step up transformer is a power transformer
Step Up Transformer Font
step up transformer font view
Power Transformer Oil Temperature
transformer oil temperature design
750kV Power Transformer
750kV transformer design struture
Power Transfomer Oil Conservator
transfomer oil conservator design
Power Transformer Produce Line
worker produce power transformer
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
Power transformers have been successfully applied in many projects and have been highly praised by customers.
Venezuela Residential Area
CompletedProvide stable and reliable power conversion solutions for the residential area to meet diverse production needs.
Country：Venezuela
Model：220kV Power Transformer x 5
Uruguay Data Center
CompletedEnsure the power safety of surrounding residents and meet daily work needs
Country：Uruguay
Model：350kV Power Transformer x 10
Dominican Factory
CompletedNPC transformers provide safe, efficient, and reliable power distribution in the Dominican.
Country：Dominican
Model：450kVA Power Transformer x 4
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 is the power transformer?
A power transformer is a type of electrical transformer designed to transfer energy between different voltage levels in power generation and distribution systems. It operates at high efficiency, enabling stable voltage transmission across long distances. NPC Electric manufactures step up and step down power transformers to support power plants, substations, and industrial networks worldwide. -
Why do we use power transformers?
We use power transformers to adjust voltage levels for efficient power transmission and distribution. A step up transformer increases voltage for long-distance transmission, minimizing energy loss, while a step down transformer reduces voltage for safe end-user consumption. These electrical transformers are essential for maintaining grid stability and efficient energy flow. -
What is the difference between a step up and a step down transformer?
The main difference lies in voltage conversion. A step up transformer raises the voltage from a lower level to a higher level for transmission, while a step down transformer decreases voltage to supply local or residential loads. Both are key components in modern power transformer systems ensuring efficient and safe energy delivery. -
Where are power transformers used?
Power transformers are widely used in electrical substations, industrial plants, renewable energy systems, and transmission networks. Whether a step up transformer for a solar power station or a step down transformer for factory distribution, they play a crucial role in converting and controlling electrical energy efficiently. -
How do power transformers improve energy efficiency?
Power transformers improve energy efficiency by reducing voltage-related losses during transmission. Using step up and step down transformers, electrical utilities can deliver power over long distances with minimal waste. NPC Electric’s high-efficiency power transformers are engineered with low-loss cores, advanced insulation, and optimized cooling systems to ensure maximum performance. -
What are the main components of a power transformer?
The key components of a power transformer include the core, windings, insulation, cooling system, and protective enclosure. The core carries magnetic flux, while the primary and secondary windings handle voltage transformation. NPC Electric designs electrical transformers with high-grade silicon steel cores and advanced insulation to ensure high efficiency, reliability, and safety.
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