Yawei Transformer provides advanced HV Power Transformers, specifically designed to meet the demands of modern high-voltage power transmission networks. Our transformers support voltage ratings up to 500 kV, with capacities ranging from 50 MVA to 1200 MVA, and are widely used in industrial, utility, and infrastructure projects. Whether for grid systems, power plants, or renewable energy projects, we offer reliable, efficient voltage conversion and stable power distribution to ensure smooth operations globally. As a global supplier, Yawei Transformer offers customized solutions to meet the specific requirements of each project, ensuring that every transformer complies with international standards such as IEC, ANSI, and IEEE.
Whether for cross-border power transmission, substation installations, or renewable energy integration, Yawei’s HV Power Transformers are the ideal solution to ensure the efficient operation of large-scale power systems. Our transformers are available in oil-immersed and oil-filled designs, suitable for extreme operating conditions. Each transformer is meticulously engineered to meet stringent environmental and safety regulations and can be tailored to project-specific requirements. By choosing Yawei, you will receive high-quality, high-voltage power transformers and enjoy full lifecycle support, ensuring successful project implementation and long-term stable operation.
HV Power Transformers – Extra High Voltage Solutions up to 500 kV & 1200 MVA
Yawei Transformer provides a full portfolio of HV Power Transformers (High Voltage and Extra High Voltage Power Transformers) engineered for large-scale transmission networks, utility substations, power plants, and national grid infrastructure projects. Our high-voltage transformer solutions are designed to support primary voltages up to 500 kV and rated capacities up to 1200 MVA, meeting the most demanding requirements of modern power transmission systems worldwide.
HV power transformers play a critical role in long-distance power transmission, grid interconnection, load balancing, and voltage transformation across regional and national networks. Yawei’s high-voltage transformers are widely deployed in utility substations, generation step-up (GSU) systems, transmission substations, renewable energy integration projects, and ultra-high voltage (UHV) grid expansions.
With decades of manufacturing experience, advanced engineering capabilities, and strict international compliance, Yawei Transformer delivers factory-direct, OEM, and custom-built HV power transformers for utilities, EPC contractors, grid operators, and industrial clients around the globe.
Industrial & Utility HV Power Transformers for Transmission and Grid Networks
Yawei HV Power Transformers are designed for heavy-duty, continuous operation in high-voltage and extra-high-voltage environments, including:
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Transmission substations for regional and national power grids
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Power generation plants (thermal, hydro, nuclear, wind, and solar GSUs)
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Interconnection substations linking multiple voltage levels
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Cross-border transmission projects and smart grid upgrades
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Critical infrastructure including railways, metro systems, data centers, and industrial megaprojects
Our HV transformer product range covers a wide spectrum of rated capacities and voltage classes, ensuring compatibility with global grid standards and project-specific technical requirements.
HV Power Transformer Capacity Range & Voltage Classes
Yawei Transformer supports a comprehensive range of high-voltage transformer ratings, including but not limited to:
Rated Capacity:
50 MVA – 1200 MVA (custom-designed for project requirements)
Primary Voltage Levels:
66 kV, 110 kV, 132 kV, 220 kV, 330 kV, up to 500 kV
Secondary / Tertiary Voltage Options:
Custom low- and medium-voltage levels for grid interconnection, industrial supply, or auxiliary systems
These configurations allow Yawei HV power transformers to be used as step-up transformers, step-down transformers, autotransformers, or multi-winding transformers for complex transmission systems.
Technical Specifications & Compliance – High Voltage Power Transformers
Transformer Type:
Oil-Immersed, Three-Phase HV / EHV Power Transformer
Cooling Methods:
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ONAN – Oil Natural Air Natural
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ONAF – Oil Natural Air Forced
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OFAF – Oil Forced Air Forced
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OFWF – Oil Forced Water Forced (for ultra-high-capacity transformers)
Winding Configuration:
Y/Y, Y/Δ, Δ/Y, auto-transformer, or custom vector groups
Voltage Regulation:
On-Load Tap Changer (OLTC) for dynamic voltage control under load
Insulation System:
High-grade mineral oil or ester fluid, cellulose-based insulation, advanced oil-paper systems for ultra-high dielectric strength
Loss Classes:
Designed to meet or exceed international low-loss requirements, optimized for lifecycle efficiency and reduced operational costs
Noise Levels:
Engineered for low-noise operation, compliant with utility and environmental regulations
Applicable Standards:
IEC, ANSI, IEEE, GB/T, and utility-specific technical specifications
Advanced Testing & Quality Assurance for HV Power Transformers
Each HV power transformer manufactured by Yawei undergoes comprehensive factory testing to ensure safety, reliability, and long-term performance:
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Routine electrical tests (ratio, resistance, loss measurements)
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Temperature rise tests for full-load performance validation
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Lightning impulse and switching impulse tests
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Short-circuit withstand tests (thermal and mechanical)
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Partial discharge measurements
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Oil quality analysis (dielectric strength, moisture, aging indicators)
These tests guarantee that every HV power transformer meets utility-grade reliability standards before shipment.
Custom Design & OEM Solutions for High Voltage Transformers
Yawei Transformer provides fully customized HV transformer solutions, including:
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Custom capacity and voltage combinations
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Special insulation systems for harsh climates
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Compact or transport-optimized designs
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Intelligent monitoring systems (DGA, temperature, load, moisture)
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OEM branding and EPC project integration
Our engineering team works closely with utilities, consultants, and EPC contractors to ensure seamless integration into complex power systems.
HV Power Transformer Dimensions, Weight & Transport Considerations
Transformer Dimensions:
Determined by voltage class, capacity, cooling method, and insulation design
Transformer Weight:
Ranges from tens to hundreds of tons for EHV units, requiring specialized logistics planning
Transport Solutions:
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Modular and split-tank designs
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Rail, road, and sea transport optimization
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On-site assembly and commissioning support
Yawei provides full technical coordination to ensure safe delivery and installation at project sites worldwide.
Real-World Applications & Global Project Experience
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500 kV Transmission Substation – China: 800 MVA HV power transformers supporting national grid expansion
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220 kV Utility Network – South America: 300 MVA transformers improving regional transmission capacity
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GSU Transformers – Middle East: High-capacity transformers for power generation plants
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Renewable Energy Grid Integration – Europe: HV transformers enabling large-scale wind and solar projects
These projects demonstrate Yawei’s capability to deliver high-performance HV power transformers for diverse global markets.
Maintenance & Lifecycle Support for HV Power Transformers
To maximize service life and operational efficiency, Yawei provides guidance on:
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Oil condition monitoring and DGA analysis
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Temperature and load management
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Periodic inspection and preventive maintenance
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On-site technical support and retrofitting solutions
Proper maintenance ensures decades of reliable operation in high-voltage transmission systems.
FAQ – High Voltage & Extra High Voltage Power Transformers
Q: What is the maximum voltage supported?
A: Yawei HV power transformers support voltages up to 500 kV.
Q: What is the maximum capacity available?
A: Designs up to 1200 MVA are available depending on project requirements.
Q: Are transformers compliant with international standards?
A: Yes, IEC, ANSI, IEEE, and GB/T standards are fully supported.
Q: Can transformers be customized for specific utilities?
A: Absolutely. Voltage, capacity, cooling, insulation, and monitoring systems can all be customized.
Why Choose Yawei for HV Power Transformers
Yawei Transformer is a trusted manufacturer and global supplier of HV and EHV power transformers, offering:
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Advanced engineering and manufacturing capabilities
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Factory-direct supply, OEM, and EPC support
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Proven performance in global transmission projects
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Full lifecycle service from design to commissioning
From 110 kV to 500 kV, and from 50 MVA to 1200 MVA, Yawei HV Power Transformers deliver reliability, efficiency, and scalability for the world’s most demanding power networks.
Contact Us – High Voltage Power Transformer Solutions
Looking for a high-voltage or extra-high-voltage power transformer for your next utility, transmission, or infrastructure project?
Contact Yawei Transformer today to discuss technical requirements, custom designs, pricing, and global delivery options. Our engineering and sales teams are ready to support your project from concept to commissioning.