Transformers
110kV 115kV Power Transformer
Power critical transmission networks and large industrial complexes with our robust 110kV and 115kV Power Transformers. These essential assets are designed for reliable and ultra-efficient voltage transformation at the heart of national and regional grids. Our 110kV and 115kV Power Transformers are meticulously engineered with advanced oil-immersed designs and highly efficient cooling systems (ONAN, ONAF, OFAF), guaranteeing industry-leading efficiency, 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 power flow. Trust our compliant and custom-tailored solutions for your vital high-voltage transmission power transformation needs.
110kV 115kV Power Transformer
NPC ELECTRIC's 110kV and 115kV power transformers are designed with advanced low-loss silicon steel sheets and efficient cooling systems, complying with international standards such as IEC 60076 and GB 1094, ensuring stable and reliable operation in high-voltage transmission systems. They are widely used in large power plants, substations, and industrial parks, providing safe and efficient power conversion and transmission solutions for power grids.
100kV 200kVA 250kVA 315kVA Three-Phase Oil-Immersed Substation Power Transformer
This 100kV three-phase oil-immersed substation power transformer is engineered for stable voltage transformation across 200kVA, 250kVA, and 315kVA capacity ranges. Designed for medium to high-voltage distribution networks, it delivers exceptional reliability, thermal endurance, and operational efficiency in substations, industrial plants, and utility distribution grids. The transformer utilizes high-grade insulation, precision-wound copper conductors, and robust core materials to ensure low losses, long service life, and consistent performance under demanding electrical and environmental conditions. Its sealed oil-immersed structure enhances insulation strength and optimizes heat dissipation for safe and continuous operation.
110kV Customized 12500kVA 20000kVA High-Voltage Electric Power Transformer
The Customized 12500kVA and 20000kVA High-Voltage Electric Power Transformer is engineered to meet the demanding requirements of grid transmission, industrial distribution, and large-scale power infrastructure. Designed with fully customized voltage configurations, high-grade copper windings, advanced insulation systems, and optimized oil-immersed cooling structures, it ensures exceptional efficiency, stable voltage regulation, and long-term operational reliability. This transformer supports heavy-load operation, complex grid environments, and diverse installation conditions, making it suitable for substations, industrial plants, renewable energy integration, and major commercial facilities. With flexible design options, strict quality control, and compliance with international standards such as IEC, IEEE, and ANSI, it delivers robust performance and extended lifecycle.
115kV 35MVA Three-Phase Oil-Immersed Power Transformer
The 115kV 35MVA Three-Phase Oil-Immersed Power Transformer is designed for reliable and efficient operation in high-voltage transmission and substation applications. Built with high-permeability silicon steel cores and precision-wound copper conductors, it delivers low losses, strong short-circuit withstand capability, and excellent thermal stability. The oil-immersed cooling system ensures effective heat dissipation, enabling continuous operation under heavy-load conditions. A robust tank structure, advanced insulation system, and outdoor-rated protection make the transformer suitable for harsh environmental conditions. Manufactured in accordance with IEC, IEEE, and ANSI standards, this transformer is widely used in utility substations, industrial power systems, and regional transmission networks where long service life, stable voltage regulation, and high operational reliability are critical.
120kV High-Voltage Three-Phase Oil-Immersed Power Transformer
The 120kV High-Voltage Three-Phase Oil-Immersed Power Transformer is engineered for reliable and efficient operation in transmission networks and high-voltage substations. Designed with high-permeability silicon steel cores and precision-wound copper conductors, it delivers low losses, excellent thermal performance, and strong short-circuit withstand capability. The oil-immersed cooling system ensures effective heat dissipation, supporting continuous operation under heavy-load and fluctuating grid conditions. A robust tank structure, advanced insulation system, and outdoor-rated protection allow stable operation in harsh climates and demanding environments. Manufactured in accordance with IEC, IEEE, and ANSI standards, this transformer is widely applied in utility grids, industrial power systems, and large-scale infrastructure projects where high reliability, long service life, and stable voltage transformation are essential.
121kV Oil-Immersed High-Voltage Power Transformer
The 121kV Oil-Immersed High-Voltage Power Transformer is designed to provide stable, efficient, and long-term power transformation for transmission networks and high-voltage substations. Utilizing high-quality silicon steel cores and precision-wound copper conductors, the transformer achieves low no-load losses, strong short-circuit withstand capability, and excellent thermal stability. The oil-immersed insulation and cooling system ensures effective heat dissipation, supporting continuous operation under heavy-load and fluctuating grid conditions. Its reinforced tank structure, advanced insulation system, and outdoor-rated protection design enable reliable performance in harsh climates and demanding environments. Manufactured in accordance with IEC, IEEE, and ANSI standards, this transformer is widely applied in utility grids, industrial power systems, and infrastructure projects requiring high reliability, safety, and long service life.
125kV Three-Phase Power Distribution Transformer
The 125kV Three-Phase Power Distribution Transformer is engineered to deliver reliable, efficient, and stable voltage transformation for high-voltage distribution networks and utility substations. Designed with a high-permeability silicon steel core and precision-wound conductors, it achieves low no-load loss, reduced operating noise, and excellent short-circuit withstand capability. The robust insulation system and optimized thermal design ensure long-term performance under continuous load and fluctuating grid conditions. Its reinforced tank structure and outdoor-rated configuration allow safe operation in demanding environments, including high temperature, humidity, and industrial pollution areas. Manufactured in compliance with IEC, IEEE, and ANSI standards, this transformer is suitable for modern power distribution systems requiring high reliability, operational safety, and extended service life.
130kV High-Voltage Power Transformer
The 130kV Power Transformer is designed for advanced high-voltage transmission and distribution systems requiring superior electrical stability and long-term operational reliability. Built with an optimized magnetic circuit and precision-engineered windings, it delivers excellent voltage regulation, minimized energy losses, and strong resistance to thermal and mechanical stress. The transformer features a reinforced insulation structure and a sealed oil-immersed cooling system that ensures consistent performance under fluctuating load and environmental conditions. Its rugged construction supports outdoor installation and continuous operation in demanding climates. Designed to meet international grid requirements, this transformer is suitable for utility networks, industrial power hubs, and infrastructure projects where safety, efficiency, and service continuity are critical.
130kV 10MVA / 25MVA / 40MVA Electrical Power Transformer
The 130kV Electrical Power Transformer with ratings of 10MVA, 25MVA, and 40MVA is designed to support medium-to-large capacity power transmission and distribution systems. It is engineered to provide consistent voltage conversion, high operational efficiency, and excellent thermal stability under variable grid conditions. The transformer incorporates a precisely calculated magnetic core, high-strength winding design, and an oil-immersed insulation system that enhances heat dissipation and electrical reliability. Its structure is optimized to withstand electrical stress, mechanical vibration, and long-term continuous operation. Suitable for outdoor installation, the transformer maintains stable performance in challenging environments such as high temperature, humidity, or heavy industrial zones. Built in accordance with recognized international standards, it offers dependable service life and reduced maintenance requirements for modern power networks.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.
Foundation for Grid Stability
Our 110kV and 115kV Power Transformers serve as the foundation for national grid stability, playing an indispensable role in maintaining the integrity and reliability of large-scale power transmission systems. Designed for high-MVA capacity and continuous operation, these transformers efficiently manage voltage levels between generating stations and major load centers. Their robust performance minimizes grid disturbances and ensures a steady flow of electricity. By deploying our grid-stabilizing high-voltage transformers, you strengthen your electrical infrastructure, contributing directly to the energy security and consistent power supply that modern economies depend on.
Advanced Cooling for Sustained Performance
We integrate advanced cooling systems into our 110kV and 115kV Power Transformers to ensure sustained peak performance even under extreme loads and ambient temperatures. Utilizing efficient cooling configurations such as Forced Oil Air Forced (OFAF) or Forced Oil Water Forced (OFWF), these transformers effectively dissipate heat, preventing overheating and extending the lifespan of critical components. This superior thermal management allows for continuous high-power output and maintains operational efficiency. By choosing our optimally-cooled high-voltage transformers, you guarantee reliable and long-lasting operation, crucial for the demanding requirements of high-voltage transmission and substation applications.
Enhanced Short-Circuit Protection
Our 110kV and 115kV Power Transformers are engineered with enhanced short-circuit withstand capability, providing critical protection for your power system against severe electrical faults. The robust winding design and structural integrity ensure the transformer can endure the immense mechanical forces generated during short circuits, preventing catastrophic failure and minimizing damage to adjacent equipment. This superior resilience translates into improved system reliability and reduced recovery times after faults. By selecting our fault-tolerant high-voltage transformers, you significantly enhance the safety and operational continuity of your transmission grid, mitigating risks associated with unpredictable electrical events.
Long-Term Value & Low TCO
Our 110kV and 115kV Power Transformers represent a long-term investment with a low total cost of ownership (TCO). Combining high efficiency, exceptional reliability, and minimal maintenance requirements, these transformers deliver outstanding economic value over their extended operational lifespan. Reduced energy losses translate to lower operating expenses, while robust construction minimizes the need for costly repairs or early replacements. By choosing our economical high-voltage transformers, you optimize your capital expenditure and achieve superior performance, ensuring that your electrical infrastructure remains both technologically advanced and financially sound for decades to come.
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 is the primary role of 110kV and 115kV Power Transformers in the grid?
110kV and 115kV Power Transformers serve as the grid backbone for high-voltage transmission lines. Their primary role is to efficiently step up voltage from generating stations for long-distance transmission, or step down voltage at major substations for further distribution, ensuring stable power flow across the entire network. -
How do your 110kV/115kV Power Transformers achieve maximum efficiency?
Our 110kV/115kV Power Transformers are engineered for maximum efficiency through optimized core designs, high-quality windings, and advanced cooling systems. This design minimizes both no-load and load losses, ensuring that nearly all generated electricity is effectively transmitted, leading to significant energy savings and reduced operational costs for transmission lines. -
What specific applications benefit most from 110kV and 115kV Power Transformers?
Applications benefiting most from 110kV and 115kV Power Transformers include large-scale power transmission substations, interconnections for major power plants (conventional and renewable), and the primary power supply for extremely large industrial complexes. They are essential for any system requiring robust high-voltage transformation. -
What types of cooling systems are available for your 110kV/115kV Power Transformers?
Our 110kV/115kV Power Transformers are typically oil-immersed and utilize sophisticated cooling systems to maintain optimal temperatures. Common configurations include ONAN (Oil Natural Air Natural), ONAF (Oil Natural Air Forced), OFAF (Oil Forced Air Forced), and for very large units, OFWF (Oil Forced Water Forced), chosen based on capacity and site requirements. -
How do your 110kV and 115kV Power Transformers ensure long-term reliability for transmission?
Our 110kV and 115kV Power Transformers ensure long-term reliability for transmission lines through robust construction, superior dielectric strength, and enhanced short-circuit withstand capability. They are rigorously tested to endure extreme conditions and provide consistent power quality, acting as a durable grid backbone asset with minimal maintenance needs.
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