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.
200kV High Voltage Power Transformers – Reliable & Efficient Solutions
The 200kV High Voltage Power Transformer is engineered to support large-scale power transmission systems requiring high reliability, electrical efficiency, and long-term operational stability. Designed for modern grid infrastructures, this transformer enables safe and efficient voltage transformation across extended transmission distances while minimizing energy losses. Its oil-immersed insulation system ensures strong dielectric performance and effective thermal management under continuous high-voltage stress. The transformer structure is optimized to withstand electrical, thermal, and mechanical loads, supporting stable operation under fluctuating demand conditions. Precision manufacturing and advanced design techniques contribute to low maintenance requirements and extended service life. Suitable for utility substations and critical power nodes, this transformer delivers dependable performance for high-capacity transmission and grid interconnection projects.
220kV 3-Phase Oil-Immersed Power Transformer – Reliable & Efficient
The 220kV 3-Phase Oil-Immersed Power Transformer is designed for high-capacity transmission and substation systems that demand long-term reliability and superior electrical efficiency. Built for modern power grids, it enables stable voltage transformation while minimizing operational losses over extended transmission distances. The oil-immersed insulation system provides excellent dielectric strength and efficient heat dissipation, supporting continuous operation under heavy electrical loads. Advanced core and winding design reduces noise and energy loss while improving voltage regulation accuracy. The robust mechanical structure enhances resistance to thermal stress and short-circuit forces, ensuring dependable performance in demanding grid environments. This transformer is ideal for utility substations, regional grid interconnections, and critical power infrastructure requiring efficient, safe, and stable high-voltage power delivery.
230kV 3-Phase Step-Down Power Transformer
The 230kV 3-Phase Step-Down Power Transformer is designed to reduce high transmission voltages to suitable distribution levels while maintaining excellent efficiency and operational stability. Engineered for utility substations and large-scale grid interfaces, this transformer ensures safe and controlled power delivery from high-voltage networks to regional or industrial distribution systems. Its oil-immersed insulation system provides strong dielectric protection and efficient thermal dissipation, enabling reliable continuous operation under varying load conditions. Precision core construction and optimized winding layout help minimize energy losses and voltage fluctuation. The transformer’s robust mechanical design enhances resistance to short-circuit forces and thermal stress, supporting long service life and low maintenance. This solution is ideal for modern power grids requiring dependable voltage transformation and efficient energy management.
260 kV 20MVA 28 MVA Substation Power Transformer
The robust 260 kV 20/28 MVA substation power transformer, engineered for high-voltage applications in modern electrical grids. This oil-immersed unit features dual capacity ratings for flexible operation under varying loads, ensuring efficient power distribution and voltage step-down in utility substations. With advanced insulation systems and low-loss core materials, it minimizes energy dissipation while handling peak demands reliably. Ideal for integrating renewable energy sources or industrial power systems, this transformer complies with IEC 60076 standards, offering superior performance in harsh environments. Its compact design facilitates easy installation, making it a top choice for upgrading aging infrastructure or expanding grid capacity.
300 kV 31.5MVA 40 MVA High Voltage Power Transformer
Unlock superior grid performance with the state-of-the-art 300 kV 31.5/40 MVA high voltage electrical power transformer, tailored for efficient voltage conversion in expansive transmission networks. This robust, three-phase design operates with ONAN cooling at 31.5 MVA and escalates to ONAF at 40 MVA, incorporating cutting-edge biodegradable ester insulation fluids for enhanced fire safety and environmental sustainability as per 2025 regulations. Built with high-grade grain-oriented silicon steel cores to achieve efficiency rates exceeding 98%, it reduces no-load losses and supports seamless integration with HVDC systems and renewable energy hubs. Advanced features include IoT-enabled Sensformer-like monitoring for real-time diagnostics, predictive analytics to prevent downtime, and compliance with updated IEC 60076-2025 and IEEE C57.12.00 standards for superior dielectric strength and thermal resilience. Ideal for harsh operational settings, its modular construction allows for quick field repairs, while anti-vibration mountings ensure low noise levels under 55 dB, making it perfect for proximity to populated areas.
320 kV High Voltage Power Transformer
NPC Electric 320 kV High Voltage Power Transformer is engineered for ultra-high-voltage transmission networks where reliability, efficiency, and operational safety are critical. Designed to handle extreme electrical stress, this transformer supports stable power transfer across long-distance transmission lines and major grid interconnection points. Its oil-immersed insulation system provides superior dielectric strength and efficient heat dissipation, ensuring consistent performance under continuous high-load conditions. Advanced core optimization reduces magnetic losses, while precision winding design enhances voltage regulation and system stability. The transformer structure is built to withstand thermal expansion, mechanical forces, and short-circuit events, making it suitable for demanding grid environments. With long service life, low maintenance requirements, and high operational efficiency, the 320 kV power transformer is an ideal solution for modern high-voltage substations and large-scale energy infrastructure projects.
330kV 3-Phase 2-Winding Power Transformer
NPC Electric 330kV 3-Phase 2-Winding Power Transformer is a cornerstone of Extra-High Voltage (EHV) power systems, engineered to provide seamless voltage regulation and long-term operational reliability. Designed for heavy-duty utility and industrial applications, this transformer features a high-permeability core made of premium cold-rolled grain-oriented (CRGO) silicon steel, which significantly reduces no-load losses and acoustic noise levels. The dual-winding architecture is structurally reinforced to withstand extreme electromagnetic forces and mechanical stresses during grid short-circuit events. Safety and longevity are prioritized through an advanced insulation system, utilizing high-grade cellulose pressboard and inhibited mineral oil. This is complemented by precision-calculated electrostatic shielding to suppress partial discharge (PD) effectively. The transformer tank is a robust, fully-welded structure designed to maintain a full vacuum, ensuring hermetic sealing against environmental contaminants.
380kV Oil-Immersed Power Transformer
NPC Electric 380kV Oil-Immersed Power Transformer is engineered for the most demanding extra-high voltage (EHV) transmission networks, providing a robust link between power generation and regional distribution. Utilizing a multi-step core stacking method with high-grade, laser-scribed silicon steel, this unit minimizes eddy current losses and vibration. The internal active part is submerged in high-dielectric-strength mineral oil, which serves both as a superior insulator and a high-efficiency coolant. Designed with a vacuum-proof, reinforced corrugated or radiator-type tank, it ensures hermetic integrity under extreme thermal cycling. With advanced electrostatic shielding and a focus on mechanical stability, this transformer offers unparalleled reliability for national grid backbones, ensuring continuous power flow with minimal maintenance requirements even in harsh environmental conditions.
400kV Power Transformer: High-Voltage Substation Solutions
NPC Electric 400kV Power Transformer represents the pinnacle of Extra-High Voltage (EHV) engineering, specifically designed to handle the massive energy loads of modern national grids and renewable energy hubs. This unit utilizes a sophisticated cooling architecture and a low-flux density core design to ensure maximum efficiency and minimal noise pollution. Each transformer is built with a high-strength, vacuum-proof tank and premium-grade insulation materials that have undergone rigorous moisture extraction. With its advanced electromagnetic shielding, the 400kV model minimizes eddy current heating, ensuring a stable service life exceeding 30 years. It serves as a vital link in stepping down bulk power from 400kV transmission lines to regional distribution levels, offering unmatched short-circuit withstand capabilities and thermal stability for critical infrastructure projects worldwide.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
-
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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