This book delves into the innovative realm of wound core transformers designed for high-voltage power grids， moving beyond the traditional laminated core structures prone to magnetic flux leakage and energy dissipation. Through a novel enclosed wound core design that eliminates joints and corners， it presents a transformative approach that minimizes leakage and enhances the electromagnetic performance of transformers. This book not only addresses the technical challenges and solutions in transformer design but also marks a significant step forward in the pursuit of energy efficiency and performance optimization in electrical power systems. Targeting a specialized audience of professors， scholars， and graduate students engaged in transformer energy-saving optimization and related research fields，it offers an in depth exploration of the complete loss calculation，innovative manufacturing processes， and testing technologies of largescale wound core transformers.
目錄：
1 Introduction1.1 Introduction to Traction Power Supply System1.2 Overview of Energy-Saving Wound Core Traction Transformer1.3 Theoretical and Technical Challenges Faced by/Large-Capacity Wound Core Traction Transformers1.3.1 Theoretical Challenges1.3.2 Technical Challenges2 Modeling and Loss Calculation for Eddy Current Field of Wound Cores in Traction Transformers2.1 The Method for Analyzing and Calculating Eddy Current Losses in Multi-Layer Stepwise Gradient Silicon Steel Sheets2.1.1 Analytical Calculation of Two-Dimensional Rectangular Domain Eddy Current Field2.1.2 Single-Layer Trapezoidal Silicon Steel Sheet： Loss Calculation and Simulation Analysis2.1.3 Calculation of Eddy Current Losses in Multi-Layer Continuous Trapezoidal Silicon Steel Sheets2.1.4 Conclusion2.2 Homogenized Eddy Current Field Analysis Model for Wound Core Electromagnetic Anisotropy2.2.1 Coordinate Standardization of Electromagnetic Characteristic Parameters2.2.2 Solution for Transverse Parameters of the Equivalent Conductivity Matrix2.2.3 Solution for Normal Parameters of Equivalent Magnetic Permeability Matrix2.2.4 Finite Element Analysis and Loss Calculation of Eddy Current Field2.2.5 Model Validation and Test Analysis2.3 Summary2.4 Calculation Method for Eddy Current Losses in Wound Cores for Practical Engineering2.4.1 Analytical Calculation of Eddy Current Losses Under Magnetic Flux Classification Constraint2.4.2 Analytical Calculation of Eddy Current Losses Under Nonlinear Magnetic Characteristics2.4.3 Loss Coupling Model Considering Heterogeneous Magnetic Boundary Values and Nonlinear Magnetic Characteristics2.5 Summary3 Wound Core Traction Transformer Winding： Modeling and Calculation of Distributed Parameters3.1 N-Order Ladder Network Circuit Model3.2 Calculation of Distributed Inductance Parameters3.3 Calculation of Distributed Capacitance Parameters3.3.1 Effective Permittivity of Medium3.3.2 Longitudinal Equivalent Capacitance Parameters3.3.3 Capacitance to Ground Parameters3.3.4 Inter-winding Capacitance Parameters3.4 Calculation of Distributed Resistance Parameters3.5 State-Space Equation Modeling3.6 Model Verification and Optimization4 Temperature Rise Modeling and Thermal Performance Analysis of Wound Core Traction Transformers4.1 Analysis on Heat Transfer Process in Wound Core Traction Transformers4.1.1 Heat Dissipation Modes of Wound Core Traction Transformers4.1.2 Fluid Flow Patterns4.1.3 Theory of Natural Oil Circulation4.2 Simulation Modeling and Testing Verification of Computational Fluid Dynamics4.2.1 Temperature Rise Test of Traction Transformers4.2.2 Computational Fluid Dynamics Model of Temperature Rise in Traction Transformers4.3 Research on Temperature Field and Oil Flow Field of Wound Core Traction Transformer4.3.1 Research on Temperature Field and Oil Flow Field of Steady-State Wound Core Traction Transformer4.3.2 Research on Temperature Field and Oil Flow Field of Wound Core Traction Transformer Under Step Loads……5 Design and Manufacturing Technology of Wound Core Transformers6 Fault Diagnosis Methods for Large Wound Core Traction Transformers7 Testing and Application of QYS-R-（31500 25000）/220 Wound Core Traction TransformerAppendix A： Calculation Process of Main Insulation CheckAppendix B： Calculation Process of Disc Mechanical StrengthReferences
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