High Voltage Power Transformer
Sinotech manufactures High Voltage (HV) and Ultra High Voltage (UHV) power transformers engineered for utility transmission, power plant step-up applications, and large-scale industrial infrastructure. Covering voltage classes from 66kV to 750kV AC and ±800kV DC, our transformers deliver reliable performance across national grids, renewable energy integration, and heavy industry power systems.
Advanced OLTC for real-time voltage regulation under load
Oil-paper insulation ensuring superior dielectric strength
66kV to 750kV voltage class coverage with IEC certification
10MVA to 500MVA capacity range for diverse applications
Custom High Voltage Power Transformer Manufacturer in China
Sinotech HV and UHV transformers feature oil-paper insulation systems, oxygen-free copper windings, and grain-oriented silicon steel cores for superior efficiency and thermal stability. Advanced OLTC (On-Load Tap Changer) technology enables real-time voltage regulation under full load — essential for grid stability and power quality.
Max. Voltage
750kV
Max. Capacity
500MVA
Standards
ANSI/IEEE/DOE/CSA/AS
What Are the Standard Size of Sinotech High Voltage Power Transformer?
| Rated Capacity kVA | Voltage Combination and Tap Range | Connection Group Designation | No Load Loss kW | Load Loss kW | No Load Current % | Short-circuit Impedance % | |||
| High Voltage kV | High Voltage Tap Range % | Medium Voltage kV | Low Voltage kV | ||||||
| 6300 | 110 | ±4×1.25 ±6×1.25 ±8×1.25 | 36 37 38.5 | 6.3 6.6 10.5 21 | YNyn0dl1 | 7.70 | 42.0 | 0.61 | High to Medium 10.5 High to Low 17.5～19 Medium to Low 6.5 |
| 8000 | 9.20 | 50.0 | 0.61 | ||||||
| 10000 | 10.9 | 59.0 | 0.57 | ||||||
| 12500 | 12.9 | 70.0 | 0.57 | ||||||
| 16000 | 15.4 | 86.0 | 0.54 | ||||||
| 20000 | 18.2 | 101 | 0.54 | ||||||
| 25000 | 21.6 | 120 | 0.50 | ||||||
| 31500 | 25.7 | 142 | 0.50 | ||||||
| 40000 | 308 | 170 | 0.46 | ||||||
| 50000 | 36.4 | 202 | 0.46 | ||||||
| 63000 | 43.3 | 243 | 0.42 | ||||||
Note: Above Is Technical Parameters of 110kV Power Transformer
Custom High Voltage Power Transformer Solutions
Sinotech delivers custom high voltage power transformer solutions engineered for clients whose projects demand more than standard catalog products. From non-standard voltage ratios to extreme environmental adaptations, we design and manufacture transformers that fit your exact technical and operational requirements.
Our custom capabilities span voltage classes from 66kV to 220kV with options up to 750kV, capacities from 10MVA to 200MVA with special projects reaching 500MVA, and impedance values tailored from 4% to 18% beyond standard IEC ranges. We also design for extreme conditions including altitudes up to 4,000 meters and ambient temperatures from -50°C to +55°C.
Our Global Projects
High Voltage Transformer in Venezuela
High Voltage Transformer in Argentina
High Voltage Transformer in Angola
High Voltage Transformer in Jordan
High Voltage Power Transformers in Australia
High Voltage Power Transformers in South Africa
High Voltage Power Transformer Application
Sinotech custom power transformers have been deployed in demanding applications worldwide — from high-altitude mining sites above 3,000 meters in the Andes, to desert solar farms facing 50°C temperature swings, to coastal substations requiring FR3 natural ester insulation and corrosion-resistant coatings. We also serve industrial plants with high harmonic loads requiring K-rated designs, and retrofit projects matching existing footprints and connection interfaces.
National Grid Transmission Substations
Hydropwer and Thermal Power Plant Step up Stations
Wind and Solar Farm Grid Integration Transmission
High Quality, Reliable, and Long lasting High Voltage Transformer
Sinotech manufactures high voltage transformers built for performance, durability, and decades of reliable service. Every unit is engineered with precision, tested rigorously, and delivered with complete documentation. We use premium materials including grain-oriented silicon steel cores, oxygen-free copper windings, and high-grade insulation oil to ensure optimal efficiency and thermal performance.
30+ Years of Industry Expertise
With over 30 years of combined experience in power electrical engineering, Sinotech brings unmatched technical depth to every project. Our team understands the complexities of different voltage levels, load profiles, and environmental conditions.
Large Manufacturing Capability
Sinotech operates a world-class manufacturing base capable of handling both small custom orders and large-volume utility projects. Our scale ensures consistent quality, competitive pricing, and reliable delivery for clients worldwide.
Comprehensive Product Portfolio
Sinotech offers a complete range of power transformation products, eliminating the need for multiple suppliers. From distribution transformers to prefabricated substations, we cover your entire power infrastructure requirements.
Full Customization Capability
Sinotech engineers custom transformer solutions for high-altitude zones, extreme temperatures, corrosive atmospheres, and renewable energy applications with documented project success.
IEC, ANSI, and CE Certified Quality
Every Sinotech transformer meets stringent international standards. We provide full test reports and certification documentation with each shipment, ensuring regulatory compliance in your target market.
Rigorous Quality Control Process
Quality is built into every step of our manufacturing process. From silicon steel core selection to vacuum oil filling, Sinotech maintains strict controls to guarantee performance, safety, and long service life.
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OEM High Voltage Power Transformer Supplier
Our production lines support both standard power transformer models and fully custom designs, with annual capacity exceeding 15,000 transformer units. We have successfully executed OEM orders for clients in Southeast Asia, the Middle East, Africa, Latin America and more.
Our production lines support both standard power transformer models and fully custom designs, with annual capacity exceeding 15,000 transformer units. We have successfully executed OEM orders for clients in Southeast Asia, the Middle East, Africa, Latin America and more.
Sinotech welcomes inquiries from distributors, brand owners, and EPC contractors seeking a reliable power transformer manufacturer.
Hydropower Plant — Vietnam
“We needed custom 110kV step-up transformers for a remote hydro station. Sinotech designed units with high-altitude derating and OLTC. Performance has been stable through two rainy seasons. Very satisfied with the quality and service.”
Global Clients
