Transformers
35kV 46kV Power Transformer
Deliver optimized and reliable power transformation at medium-high voltage with our 35kV and 46kV Power Transformers. These specialized transformers are crucial for stepping up or stepping down voltage within industrial applications, sub-transmission networks, and renewable energy interconnections. Our 35kV and 46kV Power Transformers are precision-engineered with robust oil-immersed designs and efficient cooling systems, ensuring exceptional efficiency, low losses, superior dielectric strength, and high short-circuit withstand capability. Built for continuous operation in challenging environments, they guarantee stable power flow and grid integration. Trust our compliant and custom-tailored solutions for your specific medium-high voltage power transformation needs.
35kV 46kV Power Transformer
NPC ELECTRIC's 35kV and 46kV power(electrical) transformer complies with international standards such as IEC and ANSI, and features high efficiency, low loss, and strong insulation. This product is widely used in power grid main transformers, power plants, industrial and mining enterprises, and large infrastructure projects. It has a compact structure and reliable operation, and is suitable for all types of outdoor and indoor installation environments.
6kV Three-Phase Oil-Immersed Power Transformer
The 6kV Three-Phase Oil-Immersed Power Transformer is designed for stable and efficient voltage conversion in industrial and commercial power distribution systems. With a durable oil-immersed insulation structure and high-quality copper windings, it offers excellent thermal performance, strong dielectric strength, and reliable operation under varying load conditions. Its compact design, robust core materials, and advanced cooling system ensure low losses, reduced noise, and long service life. This 6kV transformer is suitable for factories, mining sites, distribution stations, and utility networks requiring consistent and safe electrical power supply. Engineered to meet international standards, it provides dependable performance and high efficiency across diverse low-to-medium voltage applications.
20kV Three-Phase Oil-Immersed Power Transformer 50-2500kVA Copper
The 20kV Three-Phase Oil-Immersed Power Transformer 50-2500kVA Copper adopts high-purity electrolytic copper windings, Class A insulation, and advanced ONAN cooling design. Available in energy-saving S11/S13/S20 series with no-load loss reduced by up to 40%. Fully sealed corrugated tank or conservator type effectively prevents oil aging and moisture ingress. It complies with IEC 60076, GB/T 1094, and can be equipped with ±5% or ±2×2.5% off-circuit tap changer. Low noise (<55 dB), strong short-circuit withstand capability, and overload capacity make it ideal for industrial parks, commercial buildings, and renewable energy projects. Vacuum oil filling and nitrogen sealing ensure insulation performance for over 30 years. Factory supports full third-party inspection (SGS/BV) and provides type test reports.
11kV Three-Phase Oil-Immersed Power Transformer
The 11kV Three-Phase Oil-Immersed Power Transformer is engineered for stable and efficient distribution across medium-voltage networks. Designed with high-grade silicon steel, advanced insulation systems, and premium mineral oil, this transformer ensures superior dielectric strength, excellent heat dissipation, and long service life. Its oil-immersed configuration delivers reliable cooling performance, enabling continuous operation under varying load conditions. The three-phase design ensures balanced power delivery, reduced energy losses, and improved grid stability. With enhanced short-circuit strength, low noise levels, and robust mechanical structure, it is suitable for industrial facilities, commercial complexes, substations, and utility distribution networks. Custom voltage ratios, tap changers, protection devices, and enclosure options are available to meet regional standards and project-specific requirements.
33kV Three-Phase Oil-Immersed Step-Up Power Transformer
The 33kV Three-Phase Oil-Immersed Step-Up Power Transformer is engineered for reliable voltage elevation in medium- and high-voltage distribution networks. Designed with high-grade silicon-steel cores, copper windings, and an efficient oil-immersed cooling system, this transformer delivers stable power transmission with low losses and strong short-circuit endurance. Its robust insulation, sealed tank structure, and advanced protection devices ensure long-term performance in demanding industrial and substation environments. Widely used in renewable energy plants, utility networks, industrial facilities, and rural power upgrades, the 33kV step-up transformer provides secure, efficient, and continuous operation. It supports both on-load and off-load tap changers, offering precise voltage regulation and adaptability to varying grid conditions, making it a dependable choice for modern power distribution systems.
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.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
35kV and 46kV 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 35kV and 46kV power transformers are trusted worldwide for efficiency, safety, and reliability.
Optimized for Medium-High Voltage
NPC Electric 35kV and 46kV Power Transformers are specifically optimized for medium-high voltage grids, offering precise and reliable voltage transformation critical for sub-transmission lines, large industrial loads, and renewable energy integration. Designed to handle the unique characteristics of these voltage levels, they ensure stable power flow and seamless integration within complex network architectures. This specialization guarantees peak performance and efficiency where these specific voltage classes are utilized. By choosing our medium-high voltage transformers, you ensure that your power infrastructure is equipped with tailor-made solutions for optimal operation and grid stability.
Exceptional Efficiency & Low Losses
We engineer our 35kV and 46kV Power Transformers for exceptional efficiency and ultra-low losses, contributing significantly to energy conservation and reduced operational expenditures. Utilizing premium-grade magnetic core materials and optimized winding designs, these transformers minimize no-load and load losses during voltage conversion. This translates directly into more power delivered to the load and less wasted heat. By deploying our high-efficiency power transformers, you not only enhance the overall performance and sustainability of your medium-high voltage network but also achieve substantial long-term cost savings, maximizing the return on your investment in power transformation.
Robust Reliability for Demanding Use
NPC Electric 35kV and 46kV Power Transformers are built with robust reliability in mind, designed for continuous and demanding operations in critical applications. Featuring durable oil-immersed construction with advanced cooling (ONAN/ONAF) and high-quality insulation, they ensure consistent performance even in harsh environmental conditions and under varying load profiles. Each transformer undergoes rigorous testing to guarantee superior dielectric strength and high short-circuit withstand capability. By selecting our reliable medium-high voltage transformers, you invest in long-term operational stability and uninterrupted power flow, safeguarding your industrial processes or sub-transmission infrastructure against unexpected disruptions.
Custom Solutions for Project Needs
We offer customized solutions for our 35kV and 46kV Power Transformers, tailoring each unit to your specific project requirements. Our engineering team collaborates closely to define optimal specifications for voltage ratios, impedance, tap changer configurations (OLTC/OCTC), cooling types, and specialized accessories. Whether you need a specific footprint for a restricted substation, enhanced noise reduction for urban areas, or features for smart grid integration, we deliver. By choosing our custom power transformers, you gain a precisely engineered solution that perfectly integrates with your existing electrical network, ensuring peak performance and future scalability for your unique medium-high voltage power transformation 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
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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 are 35kV and 46kV Power Transformers primarily used for?
35kV and 46kV Power Transformers are primarily used for voltage transformation in medium-high voltage grids, including sub-transmission networks, industrial power supply, and integration of renewable energy sources. They efficiently step up or step down voltage for optimal power delivery. -
What are the key advantages of your 35kV/46kV Power Transformers?
Our 35kV/46kV Power Transformers offer exceptional efficiency, low losses, robust reliability, and superior dielectric strength. They are designed for demanding, continuous operation, ensuring stable and high-quality power transformation in critical applications. -
Are your 35kV and 46kV Power Transformers customizable for specific projects?
Yes, we provide custom-engineered solutions for our 35kV and 46kV Power Transformers. We can tailor specifications such as voltage ratios, impedance, cooling types (e.g., ONAN, ONAF), and tap changer configurations (OLTC/OCTC) to meet your unique medium-high voltage power requirements. -
What cooling methods are typically used in your 35kV/46kV Power Transformers?
Our 35kV/46kV Power Transformers commonly utilize oil-immersed designs with advanced cooling methods such as ONAN (Oil Natural Air Natural) for natural heat dissipation, and ONAF (Oil Natural Air Forced) for enhanced cooling under heavier loads. These methods ensure efficient thermal management and reliable operation. -
How do your 35kV and 46kV Power Transformers contribute to grid stability?
Our 35kV and 46kV Power Transformers enhance grid stability through excellent voltage regulation and robust short-circuit withstand capability. Equipped with precise tap changers, they maintain stable output voltage, prevent disruptions, and ensure consistent power quality within the medium-high voltage network.
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