Table of Contents

1 Introduction
1.1 Introduction to Traction Power Supply System
1.2 Overview of Energy-Saving Wound Core Traction Transformer
1.3 Theoretical and Technical Challenges Faced by/Large-Capacity Wound Core Traction Transformers
1.3.1 Theoretical Challenges
1.3.2 Technical Challenges

2 Modeling and Loss Calculation for Eddy Current Field of Wound Cores in Traction Transformers
2.1 The Method for Analyzing and Calculating Eddy Current Losses in Multi-Layer Stepwise Gradient Silicon Steel Sheets
2.1.1 Analytical Calculation of Two-Dimensional Rectangular Domain Eddy Current Field
2.1.2 Single-Layer Trapezoidal Silicon Steel Sheet： Loss Calculation and Simulation Analysis
2.1.3 Calculation of Eddy Current Losses in Multi-Layer Continuous Trapezoidal Silicon Steel Sheets
2.1.4 Conclusion
2.2 Homogenized Eddy Current Field Analysis Model for Wound Core Electromagnetic Anisotropy
2.2.1 Coordinate Standardization of Electromagnetic Characteristic Parameters
2.2.2 Solution for Transverse Parameters of the Equivalent Conductivity Matrix
2.2.3 Solution for Normal Parameters of Equivalent Magnetic Permeability Matrix
2.2.4 Finite Element Analysis and Loss Calculation of Eddy Current Field
2.2.5 Model Validation and Test Analysis
2.3 Summary
2.4 Calculation Method for Eddy Current Losses in Wound Cores for Practical Engineering
2.4.1 Analytical Calculation of Eddy Current Losses Under Magnetic Flux Classification Constraint
2.4.2 Analytical Calculation of Eddy Current Losses Under Nonlinear Magnetic Characteristics
2.4.3 Loss Coupling Model Considering Heterogeneous Magnetic Boundary Values and Nonlinear Magnetic Characteristics
2.5 Summary

3 Wound Core Traction Transformer Winding： Modeling and Calculation of Distributed Parameters
3.1 N-Order Ladder Network Circuit Model
3.2 Calculation of Distributed Inductance Parameters
3.3 Calculation of Distributed Capacitance Parameters
3.3.1 Effective Permittivity of Medium
3.3.2 Longitudinal Equivalent Capacitance Parameters
3.3.3 Capacitance to Ground Parameters
3.3.4 Inter-winding Capacitance Parameters
3.4 Calculation of Distributed Resistance Parameters
3.5 State-Space Equation Modeling
3.6 Model Verification and Optimization

4 Temperature Rise Modeling and Thermal Performance Analysis of Wound Core Traction Transformers
4.1 Analysis on Heat Transfer Process in Wound Core Traction Transformers
4.1.1 Heat Dissipation Modes of Wound Core Traction Transformers
4.1.2 Fluid Flow Patterns
4.1.3 Theory of Natural Oil Circulation
4.2 Simulation Modeling and Testing Verification of Computational Fluid Dynamics
4.2.1 Temperature Rise Test of Traction Transformers
4.2.2 Computational Fluid Dynamics Model of Temperature Rise in Traction Transformers
4.3 Research on Temperature Field and Oil Flow Field of Wound Core Traction Transformer
4.3.1 Research on Temperature Field and Oil Flow Field of Steady-State Wound Core Traction Transformer
4.3.2 Research on Temperature Field and Oil Flow Field of Wound Core Traction Transformer Under Step Loads
……
5 Design and Manufacturing Technology of Wound Core Transformers
6 Fault Diagnosis Methods for Large Wound Core Traction Transformers
7 Testing and Application of QYS-R-（31500+25000）/220 Wound Core Traction Transformer
Appendix A： Calculation Process of Main Insulation Check
Appendix B： Calculation Process of Disc Mechanical Strength
References

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