| Chinese abstract | 第1-7页 |
| English abstract | 第7-9页 |
| List of Contents | 第9-13页 |
| List of tables | 第13-15页 |
| List of figures | 第15-17页 |
| Chapter One Introduction and Review of Relevant Literature | 第17-29页 |
| ·Introductory Remarks | 第17页 |
| ·Power system protection | 第17-18页 |
| ·Protective relaying requirements | 第18-19页 |
| ·Reasons of power transformer faults | 第19页 |
| ·Types of transformer faults | 第19页 |
| ·Power transformer protection | 第19-20页 |
| ·Types of Protection employed to power transformer | 第20-21页 |
| ·Electrical based fault detection | 第21页 |
| ·Mechanical based fault detection | 第21页 |
| ·Power transformer differential current protective relaying operating philosophy | 第21-22页 |
| ·Literature review of power transformer differential relaying | 第22-27页 |
| ·Wave shape based recognition technique | 第22-23页 |
| ·Harmonic-based restraint algorithm techniques | 第23-24页 |
| ·Differential equation algorithm (DEA) based current-flux linkage relationship reconstruction technique | 第24页 |
| ·Fuzzy logic based algorithm techniques | 第24-25页 |
| ·Artificial neural network (ANN) based algorithm techniques | 第25页 |
| ·Wavelet based algorithm techniques | 第25-27页 |
| ·Objective of the research | 第27页 |
| ·Innovative points | 第27-28页 |
| ·Thesis organization | 第28-29页 |
| Chapter Two Transformer Differential Protective Relaying Concept | 第29-69页 |
| ·Introduction | 第29页 |
| ·Differential current protective relaying | 第29-30页 |
| ·Power transformer differential current protective relaying | 第30-31页 |
| ·Magnetizing inrush current phenomenon | 第31-38页 |
| ·Characteristics of the magnetizing inrush current | 第36-37页 |
| ·Factors affecting the magnetizing inrush current | 第37-38页 |
| ·Percentage-bias | 第38-40页 |
| ·Digital protective relaying | 第40-42页 |
| ·Transformer digital differential current protective relaying algorithms | 第42页 |
| ·Wave-shape-based identification algorithm technique | 第42-44页 |
| ·Criterion 1 | 第42页 |
| ·Shortcomings of criterion 1 | 第42页 |
| ·Criterion 2 | 第42-43页 |
| ·Shortcomings of criterion 1 | 第43-44页 |
| ·Disadvantages of waveshape-based identification algorithm | 第44页 |
| ·Harmonic-based restraint algorithm techniques | 第44-54页 |
| ·Discrete Fourier transform (DFT) based fundamental and harmonic frequency components estimation approach | 第45-50页 |
| ·The least error squares (LES) technique based exponentially decaying components estimation approach | 第50-54页 |
| ·Differential equation algorithm (DEA) based current-flux linkage relationship reconstruction technique | 第54-66页 |
| ·DEA tcchnique application for single-phase transformer | 第55-57页 |
| ·DEA technique application for three-phase Y/Y connected transformer | 第57-61页 |
| ·DEA technique application for three-phase Δ/Y connected transformer | 第61-66页 |
| ·Wavelet transform based differential current protective relaying technique | 第66页 |
| ·The proposed technique | 第66-67页 |
| ·Chapter summary | 第67-69页 |
| Chapter Three Wavelet transform | 第69-95页 |
| ·Introduction | 第69页 |
| ·The transform techniques | 第69-70页 |
| ·Fourier transform (FT) | 第70-71页 |
| ·Short Time Fourier Transform (STFT) | 第71-74页 |
| ·Characteristics of short time Fourier transform (STFT) | 第72-74页 |
| ·Shortcomings of FT, FFT & STFT | 第74页 |
| ·Wavelet Transform technique | 第74-75页 |
| ·Wavelet transformer based signal analysis technique | 第75页 |
| ·Wavelet transform based multiresolution procedure | 第75-86页 |
| ·The concept of multiresolution | 第76-77页 |
| ·Members of wavelet family | 第77-78页 |
| ·Normalizing factor | 第78页 |
| ·The wavelet transform of time dependent signal | 第78-79页 |
| ·The discrete (dyadic) wavelet transform | 第79页 |
| ·The inner product of the scaling | 第79页 |
| ·The wavelet basis function as a recursive difference equation | 第79-80页 |
| ·Time-frequency localization philosophy | 第80页 |
| ·Wavelet time-scale domain tiling | 第80-82页 |
| ·Wavelet time-frequency domain tiling | 第82页 |
| ·Wavelet decompositions | 第82-86页 |
| ·Wavelet packet transform (WPT) | 第86页 |
| ·Wavelet transform characteristics | 第86-90页 |
| ·The right wavelet | 第90-92页 |
| ·Wavelet Transform application | 第92页 |
| ·Wavelet transform application in electrical power system | 第92-93页 |
| ·Chapter summary | 第93-95页 |
| Chapter Four Digital simulation of inrush and fault currents | 第95-115页 |
| ·Power Transformer Simulation by Saber | 第95-96页 |
| ·Building the transformer model | 第96-97页 |
| ·Simulation of inrush currents | 第97-102页 |
| ·Simulation of fault currents | 第102-113页 |
| ·External faults | 第102-104页 |
| ·Internal faults | 第104-108页 |
| ·Simulation of winding faults | 第108-110页 |
| ·Simulation of closing on an unloaded transformer with fault existence | 第110-113页 |
| ·Chapter summary | 第113-115页 |
| Chapter Five Wavelet maximum modulus algorithm technique & simulation result | 第115-143页 |
| ·Wavelet maximum modulus based differential current relaying technique | 第115-117页 |
| ·The discrete wavelet transform maximum modulus technique | 第117-118页 |
| ·The wavelet transform modulus maxima algorithm approach | 第118-119页 |
| ·Algorithm requirements | 第119-126页 |
| ·Wavelet selection | 第120-122页 |
| ·Determination of decomposition level | 第122-123页 |
| ·Determination of sampling frequency | 第123-124页 |
| ·Determination of the threshold value | 第124-126页 |
| ·Simulation results of the single source based transformer model | 第126-136页 |
| ·Simulation results for 3-phase to ground (A-to-B-to-C-to-ground) faults | 第126-129页 |
| ·Simulation results of 2-phase to ground (A-to-B-to-ground) faults | 第129-134页 |
| ·Simulation results for 1-phase to ground (A-to-ground) faults | 第134页 |
| ·Simulation results for primary side winding faults | 第134-135页 |
| ·Simulation of primary & secondary winding (turn-to-ground) faults existing at closing instant | 第135-136页 |
| ·Simulation results of Double source based transformer model | 第136-139页 |
| ·Simulation results for 3-phase to ground (A-to-B-to-C-to-ground) faults | 第136-137页 |
| ·Simulation results for 2-phase to ground (A-to-B-to-ground) faults | 第137页 |
| ·Simulation results for 1-phase to ground (A-to-B-ground)faults | 第137-138页 |
| ·Simulation results for primary side winding faults | 第138页 |
| ·Simulation results for secondary side winding faults | 第138-139页 |
| ·Simulation results for closing at no load | 第139页 |
| ·Simulation results for closing at primary internal 3-phase (A-to-B-to-C-to-ground)fault | 第139页 |
| ·Simulation results for closing at primary internal 2-phase (A-to-B-to- ground)fault | 第139-140页 |
| ·Discussion of the results | 第140页 |
| ·Chapter summary | 第140-143页 |
| Chapter Six Conclusions and Future Work | 第143-145页 |
| ·Summary and conclusions | 第143-144页 |
| ·Suggestions for next work | 第144-145页 |
| Acknowledgement | 第145-147页 |
| References | 第147-155页 |
| VITA | 第155-157页 |
| Appendices | 第157-167页 |
| 1. List of publication | 第157-158页 |
| 2. Chincse translation of the conclusions and summaries | 第158-163页 |
| 创新点 | 第163-165页 |
| 研究重要性 | 第165-167页 |
| 独创性声明 | 第167页 |
| 学位论文版权使用授权书 | 第167页 |
