Transformers
220kV 230kV Power Transformer
Master the backbone of ultra-high voltage transmission with our advanced 220kV and 230kV Power Transformers. These critical components are engineered for unparalleled performance, delivering ultra-efficient and ultra-reliable voltage transformation at the nexus of national and international grids. Our 220kV and 230kV Power Transformers feature state-of-the-art oil-immersed designs with highly optimized cooling systems (ONAF, OFAF, OFWF), guaranteeing industry-leading efficiency, absolute minimal losses, superior dielectric strength, and exceptional short-circuit withstand capability. Built for continuous, heavy-duty operation in the most demanding environments, they ensure stable and uninterrupted massive power flow. Trust our compliant and custom-tailored solutions for your vital UHV/EHV transmission power transformation needs.
220kV 230kV Power Transformer
NPC ELECTRIC's 220kV and 230kV power transformer complies with the International Electrotechnical Commission (IEC) standards as below: 1. IEC 60076 Power Transformers; 2. AS NZS 60076 Power Transformers CSAC88-16 Power Transformers; 3. ANSI/IEEE C57.12.00 IEEE Standard for General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers; 4. GOST R 52719 Power Transformers - General Specifications; 5. EN60076 Poer Transformer; 6. Local After-Sales Services In North America South
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.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.
Essential for UHV Transmission
Our 220kV and 230kV Power Transformers are essential for the Ultra-High Voltage (UHV) transmission backbone, forming the critical nexus of national and international power grids. These extremely high-MVA capacity transformers are engineered to flawlessly manage massive power flows and extreme voltage demands at critical interconnections and large generation plants. Their precise and stable voltage transformation ensures efficient bulk power transfer across vast distances. By choosing our UHV transmission transformers, you invest in vital equipment that guarantees the stability, capacity, and resilience of your most crucial electrical infrastructure, facilitating reliable power delivery on an unprecedented scale.
Minimal Losses & Superior Efficiency
We engineer our 220kV and 230kV Power Transformers for absolute minimal losses and superior efficiency, delivering significant long-term economic and environmental advantages. Leveraging state-of-the-art magnetic core materials, optimized winding geometries, and advanced cooling systems (OFAF, OFWF), these transformers achieve the lowest possible no-load and load losses in their class. This translates directly into substantial energy conservation, reduced operational expenses, and a significantly smaller carbon footprint over their extended service life. By deploying our ultra-efficient UHV transformers, you maximize return on investment and bolster the sustainability of your UHV transmission network.
Unparalleled Reliability for Grid Stability
Our 220kV and 230kV Power Transformers offer unparalleled reliability for critical grid stability, built to operate continuously and flawlessly under the most extreme conditions. These oil-immersed units feature premium insulation, advanced surge protection, and a highly robust mechanical design, ensuring exceptional dielectric strength and industry-leading short-circuit withstand capability. Each transformer undergoes the most stringent testing to guarantee long-term operational stability and resilience against severe electrical and environmental stresses. By selecting our ultra-reliable UHV transformers, you fortify your transmission substations and vital power infrastructure with equipment proven to deliver unwavering power flow for decades, minimizing downtime.
Precision-Engineered for Complex Interconnections
We provide precision-engineered solutions for our 220kV and 230kV Power Transformers, precisely meeting the intricate demands of complex UHV grid interconnections and colossal infrastructure projects. Our expert engineering team collaborates closely with clients to define optimal MVA ratings, precise impedance values, advanced On-Load Tap Changer (OLTC) configurations, and specialized cooling arrangements. Whether for new inter-regional power superhighways, massive power plant connections, or smart grid integration, we deliver bespoke designs that maximize performance and site compatibility. By choosing our custom UHV transformers, you acquire a perfectly tailored solution that seamlessly integrates into your electrical infrastructure, ensuring peak performance and future-proofing for the most advanced grid challenges.
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
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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 critical role of 220kV and 230kV Power Transformers in the grid?
220kV and 230kV Power Transformers are the UHV grid core, serving as essential components for ultra-high voltage transmission networks. They facilitate the efficient and reliable bulk transfer of power over long distances from generation hubs to major load centers, crucial for national and international power grids. -
How do your 220kV/230kV Power Transformers achieve ultra-high efficiency and minimal losses?
Our 220kV/230kV Power Transformers achieve ultra-high efficiency and minimal losses through advanced core materials, optimized winding designs, and sophisticated cooling (OFAF, OFWF). This design drastically reduces energy waste, resulting in significant operational savings and a reduced environmental footprint in UHV transmission. -
Are your 220kV/230kV Power Transformers suitable for complex grid interconnections?
Absolutely. Our 220kV/230kV Power Transformers are precision-engineered for complex grid interconnections. We offer custom-tailored solutions for specific MVA ratings, impedance, and advanced On-Load Tap Changer (OLTC) configurations, ensuring seamless integration and optimal performance within intricate UHV networks. -
What robust features ensure the reliability of your 220kV/230kV Power Transformers?
Our 220kV/230kV Power Transformers boast unparalleled reliability due to robust oil-immersed construction, superior dielectric strength, and exceptional short-circuit withstand capability. Rigorous testing and high-quality components ensure continuous, stable operation, safeguarding critical grid infrastructure against faults and disruptions. -
What cooling systems are specifically used for these high-capacity 220kV/230kV Power Transformers?
For these high-capacity 220kV/230kV Power Transformers, we employ highly efficient forced cooling systems. This primarily includes OFAF (Oil Forced Air Forced) and, for extremely large units, OFWF (Oil Forced Water Forced). These advanced methods ensure optimal thermal management, crucial for sustained performance in UHV transmission applications.
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