Dingxin 220kV Power Transformer for Tanzania Project

Dingxin successfully supplied a 220kV oil-immersed power transformer solution for a power project in Tanzania. Designed for high-voltage transmission applications, the transformer combines advanced engineering analysis, optimized structural design, precision manufacturing, and comprehensive quality validation to deliver reliable long-term performance.

Project Requirements

The project required a transformer capable of operating reliably under demanding high-voltage conditions while maintaining excellent electrical efficiency and mechanical stability. The principal requirements included:

• Reliable 220kV-class insulation performance
• Low no-load and load losses
• Low partial discharge and operating noise
• Strong short-circuit withstand capability
• Efficient heat dissipation
• Convenient installation and maintenance
• Long service life and reduced operating costs

Engineering and Optimized Design

Dingxin’s engineering team used professional analysis software and established calculation and verification procedures to optimize the transformer’s critical components. These included the magnetic core, windings, active part, leads, insulation system, cooling structure, and oil tank.

Electrical, thermal, mechanical, and insulation characteristics were evaluated through multidimensional analysis. This comprehensive validation process helped ensure that the transformer met its intended performance requirements under normal operation and demanding grid conditions.

The optimized design also reduced unnecessary material consumption and improved the transformer’s power-to-weight ratio without compromising mechanical strength, insulation reliability, or operational safety.

Manufacturing and Quality Control

The transformer was manufactured using advanced processing equipment, carefully selected materials, and controlled production procedures. Particular attention was given to core assembly, winding manufacture, insulation treatment, active-part drying, oil processing, tank fabrication, and final assembly.

Throughout production, key manufacturing parameters were monitored to ensure dimensional accuracy and consistent quality. The completed unit underwent comprehensive factory testing and inspection before delivery.

Product Performance

The 220kV three-phase transformer platform supports rated capacities from 31,500kVA to 240,000kVA, with high-voltage ratings of 220kV or 230kV and a standard YNd11 connection configuration.

Depending on the selected capacity, the product range provides:

• No-load losses from 35kW to 160kW
• Load losses from 135kW to 567kW
• No-load current from 0.42% to 0.70%
• Low partial-discharge performance
• Low operating noise
• Compact dimensions and optimized weight
• Reliable thermal and mechanical performance

The final technical configuration can be customized according to the project’s capacity, voltage ratio, impedance, cooling method, installation environment, and applicable technical standards.

Project Outcome

The delivered transformer solution provides a dependable foundation for high-voltage power transmission in Tanzania. Its low-loss design supports improved grid efficiency, while its low-noise and low-partial-discharge characteristics contribute to stable and environmentally responsible operation.

With an optimized structure, reliable manufacturing quality, and convenient maintenance features, the transformer helps reduce lifecycle operating costs while supporting safe and continuous power delivery.