Introduction: Building Trust Through Transparency
In the global power transmission and distribution industry, trust is built not only through specifications and documentation, but through real-world verification. Factory inspections remain one of the most critical steps in ensuring that equipment meets both technical requirements and long-term operational expectations.
Recently, Yawei Transformer had the pleasure of welcoming an international client delegation to our manufacturing facility for a comprehensive inspection of a 110kV/33kV 40MVA power transformer. The visit provided a full overview of our engineering capabilities, production processes, and strict quality control systems.
Project Background and Technical Overview
This transformer is designed for substation applications, supporting stable and efficient power distribution within regional grids.
Key Technical Parameters:
- Rated Capacity: 40MVA
- Voltage Rating: 110kV / 33kV
- Frequency: 50/60Hz
- Cooling Method: ONAN / ONAF (customizable)
- Standards: IEC / IEEE compliant
- Application: Transmission & distribution substations
The design emphasizes:
- Low no-load and load losses
- High mechanical strength
- Excellent thermal performance
- Long service life under continuous operation
This type of transformer is widely used in utilities, industrial plants, and infrastructure projects worldwide.
Step-by-Step Manufacturing Process
During the visit, the client followed the entire manufacturing workflow, gaining a clear understanding of how each component contributes to overall performance and reliability.
1️⃣ Core Manufacturing
The transformer core is constructed using high-permeability silicon steel laminations, ensuring minimal energy loss and optimal magnetic performance.
2️⃣ Winding Process
High-conductivity copper windings are precisely manufactured using advanced winding machines. Strict control over insulation spacing and mechanical alignment ensures stability under short-circuit conditions.
3️⃣ Drying & Insulation
The active part undergoes a vacuum drying process to remove moisture, significantly enhancing insulation strength and extending service life.
4️⃣ Tank Fabrication & Assembly
The transformer tank is welded using automated processes to ensure structural integrity and leak prevention. All components are assembled under strict quality supervision.
Comprehensive Testing Procedures
Before shipment, the transformer underwent a full range of electrical and mechanical tests, all witnessed by the visiting client.
Routine Tests:
- Measurement of winding resistance
- Voltage ratio and vector group verification
- No-load loss and current test
- Load loss and impedance voltage test
Type & Special Tests (if required):
- Lightning impulse test
- Temperature rise test
- Short-circuit withstand verification
All results complied with IEC standards, ensuring that the transformer is fully ready for reliable field operation.
On-Site Client Interaction & Technical Discussion
Beyond inspection, the visit included detailed technical exchanges between the client’s engineers and Yawei’s design and production teams.
Key discussion topics included:
- Design optimization for specific grid conditions
- Transport and installation requirements
- Long-term maintenance considerations
- Customization options for future projects
This open communication ensures that every project is not just delivered, but fully aligned with client expectations.
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Client Feedback and Inspection Outcome
The client expressed strong satisfaction with:
- The professionalism of the engineering team
- The transparency of the manufacturing process
- The strict quality control at every stage
- The advanced testing capabilities
The successful inspection marks a key milestone before shipment and reinforces mutual trust for future cooperation.
Yawei Transformer’s Manufacturing Strength
Yawei Transformer continues to serve global markets with:
- Advanced production facilities
- Experienced engineering teams
- Strict quality management systems
- Compliance with IEC, IEEE, and international standards
Our products have been exported to multiple regions, supporting reliable power infrastructure worldwide.
Preparing for Shipment and Global Delivery
Following successful inspection and testing, the transformer is now prepared for shipment. Proper packaging, oil preservation, and transport protection measures are implemented to ensure safe delivery to the project site.
Our logistics team coordinates closely with clients to guarantee smooth transportation and on-time delivery.
Read More：250MVA 345kV Power Transformer for North America: Ready for Testing and Shipment
Conclusion: A Partnership Built on Quality
The successful factory inspection of this 110kV/33kV 40MVA transformer demonstrates Yawei Transformer’s commitment to quality, transparency, and customer satisfaction.
We believe that every visit strengthens trust, and every project builds long-term partnerships.
👉 We welcome customers worldwide to visit our factory and explore cooperation opportunities. Contact us today for more information, technical support, or quotations.
