IEEE / ANSI Compliant | Yawei Transformer Manufacturer | Factory Direct Supply
The 50MVA 138kV high voltage power transformer manufactured by Yawei Transformer is engineered for reliable operation in utility substations, industrial power systems, and transmission networks. Designed in compliance with IEEE and ANSI standards, this transformer delivers stable performance, low energy losses, and long service life for demanding grid applications.
Built at Yawei’s advanced manufacturing facility in China, each unit undergoes strict engineering design, precision assembly, and full factory testing before shipment. It is suitable for global EPC projects, utility companies, and industrial energy infrastructure requiring high reliability and efficiency.
Product Overview
This transformer is designed to handle medium-to-high capacity power transmission with excellent voltage regulation and grid stability. It is widely used in power distribution systems, renewable energy integration, and industrial substations.
With a rated capacity of 50MVA and 138kV voltage level, it ensures efficient energy transfer while minimizing operational losses.
Key Technical Specifications
| Item | Specification |
|---|---|
| Rated Capacity | 50 MVA |
| High Voltage | 138 kV |
| Low Voltage | Customizable (e.g. 13.8kV / 34.5kV) |
| Frequency | 60 Hz |
| Phase | Three-phase |
| Cooling Method | ONAN / ONAF |
| Vector Group | YNd1 / Dyn11 (customizable) |
| Tap Changer | OLTC (±10% or custom range) |
| Impedance | 10%–14% (project dependent) |
| Standards | IEEE / ANSI / IEC (optional) |
Physical Data (Engineering Reference)
| Item | Value |
|---|---|
| Total Weight | 85 – 120 tons |
| Core & Coil Weight | 45 – 65 tons |
| Oil Weight | 25 – 35 tons |
| Tank Material | High-strength low-carbon steel |
| Overall Dimensions | Approx. 6.5m × 3.8m × 4.5m |
Final size and weight may vary based on project customization and cooling configuration.
Main Materials & Components
The transformer is built using high-quality industrial-grade materials:
- Core: Grain-oriented silicon steel (low loss design)
- Windings: Oxygen-free copper or high-conductivity aluminum (optional)
- Insulation Oil: Mineral oil or natural ester fluid (optional)
- Tank: Fully welded steel tank with anti-corrosion coating
- Bushings: Porcelain or composite (IEEE/ANSI standard)
- Cooling System: Radiator banks with ONAN/ONAF configuration
- Tap Changer: Vacuum OLTC system for voltage regulation
Electrical Performance & System Stability
This transformer is designed for high-performance grid operation:
- Excellent voltage regulation under load variation
- Low no-load and load losses
- High short-circuit withstand capability
- Stable harmonic performance
- Optimized impedance for grid stability
It is suitable for continuous 24/7 operation in critical power systems.
Thermal Management System
Efficient cooling ensures long service life and stable performance:
- ONAN (Oil Natural Air Natural) for standard operation
- ONAF (Oil Natural Air Forced) for heavy load conditions
- Uniform temperature distribution design
- Extended insulation life under thermal stress
Insulation & Dielectric System
- High-grade cellulose insulation system
- Vacuum oil impregnation process
- Low partial discharge levels
- High dielectric strength margin
- Moisture-proof sealed tank structure
This ensures safe operation under 138kV high-voltage conditions.
Inquire 50MVA Transformer NowManufacturing & Factory Process (Yawei Transformer)
Each transformer is produced at Yawei’s modern factory in China with strict process control:
Manufacturing Steps:
- Core cutting and stacking
- Precision coil winding
- Vacuum drying process
- Oil filling under vacuum conditions
- Tank welding and surface treatment
- Final assembly and integration
Factory Testing (100% Before Delivery)
Every unit undergoes full electrical and mechanical testing:
- Ratio test
- Winding resistance test
- Insulation resistance test
- Load & no-load loss measurement
- Impedance test
- Temperature rise test
- Partial discharge test
- Dielectric withstand test
- Factory Acceptance Test (FAT)
All results are documented for project compliance.
Delivery Time & Logistics
- Standard production time: 90–150 days
- Custom engineering projects: 120–180 days
- Shipping method: Sea freight (FOB / CIF / DAP available)
- Packaging: Vacuum oil sealing + steel frame + export-grade protection
- Global delivery support for EPC projects
Applications
This transformer is widely used in:
- Utility substations
- Power transmission networks
- Industrial manufacturing plants
- Renewable energy systems (solar, wind, hydro)
- EPC turnkey infrastructure projects
- Grid interconnection stations
Project Application Case
Industrial Substation Expansion Project
Yawei supplied multiple 50MVA 138kV transformers for a large industrial power expansion project. The equipment was deployed to improve power distribution stability and support high-load manufacturing operations.
Project Highlights:
- Stable operation under continuous heavy load
- Reduced system losses through optimized core design
- Fully compliant with IEEE/ANSI standards
- On-time delivery with complete factory testing documentation
- Reliable integration into existing grid infrastructure
Quality Assurance System
Yawei implements strict multi-layer quality control:
- Material inspection
- Core & coil inspection
- In-process quality control (IPQC)
- Final assembly inspection
- Factory Acceptance Testing (FAT)
- Pre-shipment verification
Custom Engineering Capability
We provide full OEM and engineering customization:
- Voltage and capacity customization
- Cooling system optimization
- OLTC configuration options
- Noise reduction design
- Grid code compliance adaptation
- CSA / UL certification support (North American projects)
Packaging, Transport & Installation
- Vacuum oil sealing before shipment
- Anti-corrosion steel tank treatment
- Shock-resistant export packaging
- Sea freight logistics support
- Installation and commissioning guidance available
Why Yawei Transformer
- Professional power transformer manufacturer in China
- Advanced factory production system
- Strong engineering customization capability
- Full export experience for global utility projects
- Competitive factory-direct pricing
- Strict quality control system
- Fast technical response for EPC contractors
Read More:Power Transformers for Data Centers: Reliable, Efficient Solutions for North America
Conclusion
The 50MVA 138kV high voltage power transformer is a reliable, efficient, and fully engineered solution for modern power systems. With advanced manufacturing, strict testing standards, and global compliance capability, Yawei Transformer delivers high-performance equipment for utility and industrial substations worldwide.
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