Transformers
66kV 69kV Power Transformer
Ensure robust and ultra-efficient power transformation at high voltage levels with our 66kV and 69kV Power Transformers. These vital components are indispensable for main transmission substations, large industrial power grids, and significant renewable energy plants. Our 66kV and 69kV Power Transformers are precision-engineered with advanced oil-immersed designs and sophisticated cooling systems (ONAN, ONAF, OFAF), guaranteeing exceptional efficiency, ultra-low losses, superior dielectric strength, and high 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 critical high-voltage power transformation needs.
66kV 69kV Power Transformer
66 69kV power transformer uses high-performance silicon steel sheets and a fully sealed structure design, with excellent insulation performance and thermal stability. The product complies with international and national standards, such as 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;8. Local After-Sales Services In North America SouthIn-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.
Engineered for High Voltage Transmission
NPC Electric 66kV and 69kV Power Transformers are precisely engineered for high voltage transmission, making them indispensable for main substations and large-scale power distribution. Designed to handle the unique demands of these elevated voltage levels, they ensure secure and efficient power flow across vast distances and between different sections of the grid. This specialization guarantees optimal performance and stability in critical high-voltage networks. By choosing our high voltage transformers, you equip your power infrastructure with robust and reliable assets, fundamental for maintaining the integrity and capacity of your transmission grid.
Ultra-High Efficiency & Minimal Losses
We design our 66kV and 69kV Power Transformers for ultra-high efficiency and minimal losses, significantly contributing to grid sustainability and operational savings. Utilizing advanced magnetic core materials, optimized winding configurations, and sophisticated cooling systems (like ONAF/OFAF), these transformers achieve industry-leading low no-load and load losses during voltage conversion. This ensures maximum power delivery to consumers and minimal energy waste. By deploying our ultra-efficient power transformers, you not only enhance the overall performance of your high-voltage transmission network but also achieve substantial long-term cost reductions, maximizing your investment in power transformation.
Unmatched Reliability & Robust Construction
NPC Electric 66kV and 69kV Power Transformers boast unmatched reliability and robust construction, built for continuous, heavy-duty operation in the most challenging environments. These oil-immersed units feature high-grade insulation, durable enclosures, and advanced protection systems, ensuring superior dielectric strength and exceptional short-circuit withstand capability. Each transformer undergoes rigorous testing to guarantee long-term operational stability and resilience against electrical stresses and external factors. By selecting our reliable high-voltage transformers, you invest in critical equipment that provides unwavering power flow, safeguarding your transmission substations and large industrial loads against disruptions.
Customized Solutions for Complex Grid Needs
NPC Electric provide customized solutions for our 66kV and 69kV Power Transformers, precisely meeting the complex demands of modern high-voltage grids and large-scale projects. Our expert engineering team collaborates closely to design units with specific MVA ratings, impedance values, advanced tap changer options (OLTC), and specialized cooling configurations. Whether for new transmission lines, large industrial complexes, or renewable energy integration, we deliver tailored designs that optimize performance, space, and cost-efficiency. By choosing our custom high-voltage transformers, you acquire a perfectly engineered solution that integrates seamlessly into your electrical infrastructure, ensuring peak performance and adaptability for future grid requirements.
Product Show
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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 66kV and 69kV Power Transformers primarily used for?
66kV and 69kV Power Transformers are vital for high-voltage power transmission and distribution. They are primarily used in main substations, large industrial facilities, and major renewable energy plants to efficiently step up or step down voltage, ensuring stable power flow across the grid. -
What makes your 66kV/69kV Power Transformers ultra-efficient?
Our 66kV/69kV Power Transformers achieve ultra-high efficiency through optimized core designs, premium magnetic materials, and advanced winding configurations. This minimizes no-load and load losses, leading to significant energy savings and reduced operational costs for high-voltage networks. -
Can these high-voltage transformers be customized for specific project requirements?
Absolutely. We offer customized solutions for our 66kV and 69kV Power Transformers. Our engineering team can tailor specifications such as MVA ratings, impedance, tap changer types (OLTC/OCTC), and cooling systems (ONAF, OFAF) to perfectly integrate with your unique high-voltage grid infrastructure. -
What cooling systems are typically integrated into your 66kV/69kV Power Transformers?
NPC Electric 66kV/69kV Power Transformers predominantly use oil-immersed designs with advanced cooling systems to manage heat effectively. Common methods include ONAN (Oil Natural Air Natural), ONAF (Oil Natural Air Forced), and OFAF (Oil Forced Air Forced), selected based on the transformer's capacity and application demands. -
How do your 66kV and 69kV Power Transformers ensure grid reliability?
Our 66kV and 69kV Power Transformers ensure grid reliability through robust construction, superior dielectric strength, and high short-circuit withstand capability. These features, combined with precise voltage regulation, prevent failures, minimize downtime, and guarantee consistent power quality in critical high-voltage transmission networks.
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