基于扫频频响法的变压器绕组变形检测与诊断方法研究

目录

声明

Abstract

摘要

Table of Contents

List of Tables

List of Figures

CHAPTER 1： INTRODUCTION

1．2 Detection of Winding Deformation Techniques

1．3 Literature Review

1．4 Motivation

1．5 Objectives

1．6 Thesis Layout

CHAPTER2：Winding Deformation Physics

2．1 Introduction

2．2 Short Circuit Forces

2．3 Radial Forces

2．4 Axial Forces

2．5 Finite Element Method

2．6 An example of study of axial deformation through FEM modeling

2．7Conclusion

CHAPTER 3：High Frequency Modeling of Power Transformer

3．1 Introductlon

3．2 Winding Under Test

3．3 Frequency Response Characteristics of 10 Section and 20 Section Model

3．4 Comparison between 10 Section and 20 Section Model

3．5 Accuracy of Computation

3．6 CPU Time Computation and Memory Requirement

3．7 Complexity in a Matrix Computation without Diagonalization

3．8 Application of SFRA on Healthy Winding

3．9 Conclusion

CHAPTER4：Parameter Calculations

4．2．1Inductance Values Calculation for Healthy Windings

4．2．2Determination of series capacitance value

4．2．3Determination of ground capacitance value

4．3 Parameters calculation due to Radial Deformation

4．3．1Parameter calculation for radial deformation of first section

4．3．3Parameter calculation for radial deformation of third section

4．4 Parameters calculation due to axial deformation

4．4．1Parameter calculation for axial deformation of first section

4．4．3Parameter calculation for axial deformation of third section

4．5Summary

CHAPTER 5：Results and Discussions

5．1 Introduction

5．2 Application of Sweep Frequency Response

5．3SFRA Graphs

5．3．1Coil deformed radially

5．3．2Coil deformed axially

5．4 Discussion and observations

5．4．1Radial deformation deviations

5．4．2Axial defbrmation deviations

5．5 Conclusions

CHAPTER6：CONCLUSIONS AND PROSPECTS

6．2 Future prospects

REFERENCES

ACKNOWLEDGEMENTS