| ABSTRACT | 第5-7页 |
| LIST OF ABBREVIATIONS | 第8-12页 |
| CHAPTER 1 INTRODUCTION | 第12-28页 |
| 1.1 BACKGROUND | 第12-15页 |
| 1.2 LITERATURE REVIEW | 第15-25页 |
| 1.2.1 Modification of transformer oil | 第16-20页 |
| 1.2.2 Modification of transformer oil impregnated pressboard | 第20-21页 |
| 1.2.3 Modification mechanisms of nanofluids | 第21-25页 |
| 1.3 MAIN RESEARCH SHORTAGES OF THE SUBJECT | 第25-26页 |
| 1.4 MAIN RESEARCH CONTENTS OF THE DISSERTATION | 第26-28页 |
| CHAPTER 2 INFLUENCE OF NANOPARTICLES TYPES ON BREAKDOWN PROPERTIES OF TRANSFORMER OIL | 第28-35页 |
| 2.1 MATERIAL AND METHODS | 第28-30页 |
| 2.1.1 Composition of transformer oil based nanofluids | 第28-30页 |
| 2.2 BREAKDOWN VOLTAGE TEST | 第30-31页 |
| 2.3 RESULTS AND DISCUSSION | 第31-34页 |
| 2.3.1 POSITIVE LI BREAKDOWN STRENGTH MEASUREMENT | 第31-34页 |
| 2.4 SUMMARY | 第34-35页 |
| CHAPTER 3 EFFECT OF PURCHASED NANOPARTICLES CONCENTRATION AND SURFACE MODIFICATION ON BREAKDOWN PROPERTIES OF TRANSFORMER OIL | 第35-44页 |
| 3.1 DEVELOPMENT OF TRANSFORMER OIL NFS | 第35-36页 |
| 3.2 EXPERIMENTAL TESTS | 第36-37页 |
| 3.2.1 Breakdown voltage tests | 第36页 |
| 3.2.2 Dielectric properties measurement | 第36-37页 |
| 3.3 OUTCOMES AND RESULTS ANALYSIS | 第37-42页 |
| 3.3.1 Effect of concentrations of NPs on LI BD strength | 第37-40页 |
| 3.3.2 Effect of surface modification of NPs on LI BD strength | 第40-41页 |
| 3.3.3 Results of dielectric properties | 第41-42页 |
| 3.4 SUMMARY | 第42-44页 |
| CHAPTER 4 INFLUENCE OF PREPARED NANOPARTICLES SHAPES, SURFACE MODIFICATION AND CONCENTRATION OF ON BREAKDOWN PERFORMANCE OF TRANSFORMER OIL | 第44-54页 |
| 4.1 TRANSFORMER OIL-BASED NFS | 第44-45页 |
| 4.1.1 Preparation of NPs | 第44页 |
| 4.1.2 Preparation of NFs | 第44-45页 |
| 4.2 EXPERIMENTAL MEASUREMENT METHODS | 第45页 |
| 4.3 EXPERIMENTAL RESULTS ANALYSIS | 第45-52页 |
| 4.3.1 Lightning impulse breakdown measurement | 第45-50页 |
| 4.3.2 AC breakdown voltage measurement | 第50-51页 |
| 4.3.3 Dielectric characteristics measurement | 第51-52页 |
| 4.4 SUMMARY | 第52-54页 |
| CHAPTER 5 MODIFICATION MECHANISMS IN TRANSFORMER OIL-BASED NANOFLUIDS | 第54-62页 |
| 5.1 MECHANISMS OF IMPROVED BREAKDOWN PERFORMANCE | 第54-61页 |
| 5.1.1 Mechanism of improvement of different types of NPs | 第57-59页 |
| 5.1.2 Modification mechanism of NPs with different concentrations | 第59页 |
| 5.1.3 Modification mechanism of NPs with different surface modification | 第59-60页 |
| 5.1.4 Modification mechanism of NPs with different moisture content | 第60-61页 |
| 5.2 SUMMARY | 第61-62页 |
| CHAPTER 6 INSULATION PERFORMANCE MODIFICATION OF OIL-IMPREGNATED PRESSBOARD BY PREPARED AL_2O_3 NANOPARTICLES | 第62-71页 |
| 6.1 INTRODUCTION | 第62-63页 |
| 6.2 PREPARATION OF TRANSFORMER OIL-BASED NFS-IMPREGNATED PRESSBOARD . | 第63页 |
| 6.3 EXPERIMENTAL TEST SETUP FOR FLASHOVER VOLTAGE MEASUREMENT | 第63-65页 |
| 6.4 EXPERIMENT RESULT ANALYSIS | 第65-69页 |
| 6.4.1 Impulse creeping flashover strength | 第65-68页 |
| 6.4.2 AC creeping flashover strength | 第68-69页 |
| 6.5 SUMMARY | 第69-71页 |
| CHAPTER 7 MODIFICATION MECHANISM OF OIL-IMPREGNATED PRESSBOARD BY PREPARED AL_2O_3 NANOPARTICLES | 第71-79页 |
| 7.1 MATERIALS AND EXPERIMENTAL METHODS | 第71-73页 |
| 7.1.1Thermally stimulated depolarization current (TSDC) measurement | 第71-72页 |
| 7.1.2 Pulse electroacoustic (PEA) test | 第72页 |
| 7.1.3 Experimental setup for streamer characteristics measurement | 第72-73页 |
| 7.2 RESULTS AND DISCUSSION | 第73-75页 |
| 7.2.1 Trap distribution properties | 第73-74页 |
| 7.2.2 Charge transportation properties | 第74-75页 |
| 7.3 DISCUSSION ON MODIFICATION MECHANISMS | 第75-78页 |
| 7.4 SUMMARY | 第78-79页 |
| CHAPTER 8 EFFECT OF PREPARED AL_2O_3 NANOPARTICLES ON THERMAL AGING PROPERTIES OF TRANSFORMER OIL AND OIL-IMPREGNATED PRESSBOARD | 第79-90页 |
| 8.1 INTRODUCTION | 第79-80页 |
| 8.2 SAMPLE PREPARATION AND AGING TREATMENT | 第80-83页 |
| 8.2.1 Samples preparation | 第80-81页 |
| 8.2.2 Thermal aging treatment | 第81页 |
| 8.2.3 Color variation of the samples | 第81-83页 |
| 8.3 EXPERIMENTAL PROCEDURE AND RESULTS DISCUSSION | 第83-87页 |
| 8.3.1 AC breakdown strength of aged MO and NF | 第83页 |
| 8.3.2 Positive impulse breakdown strength of aged MOs and NFs | 第83-84页 |
| 8.3.3 LI creeping FOVs of aged OIPs and NIPs | 第84-85页 |
| 8.3.4 AC creeping FOVs of aged OIPs and NIPs | 第85-87页 |
| 8.4 MODIFICATION MECHANISM | 第87-88页 |
| 8.5 SUMMARY | 第88-90页 |
| CHAPTER 9 CONCLUSION AND FUTURE PROSPECTUS | 第90-94页 |
| 9.1 CONCLUSION | 第90-91页 |
| 9.2 INNOVATION POINTS | 第91页 |
| 9.3 FUTURE RESEARCH PROSPECTUS | 第91-94页 |
| 参考文献 (REFERENCES) | 第94-105页 |
| 致 谢 | 第105-107页 |
| 攻读博士学位期间发表的论文及其他成果 | 第107-109页 |
| 作者简介 | 第109页 |
