1  Cover

      2  Series Page

      3  Title Page

      4  Copyright Page

      5  Dedication Page

      6  Editor Biographies

      7  List of Contributors

      8  Acknowledgments

      9  Editorial

      10  1 Liquid Insulation for Power Transformers 1.1 Background of Liquid‐Filled Transformers 1.2 Insulation System in Liquid‐Filled Transformers 1.3 Insulation Aging Phenomena in Transformers 1.4 Transformer Insulating Liquids References

      11  2 Processing and Evaluation of Natural Esters 2.1 Introduction 2.2 Significant Natural Ester Liquids 2.3 Processing and Pretreatment 2.4 Properties and Evaluation of Natural Esters 2.5 Degradation of Different Vegetable Oils 2.6 Dissolved Gas Analysis in Natural Esters 2.7 Challenges in Using Natural Esters as Insulating Liquid 2.8 Conclusions and Future Scope References

      12  3 Compatibility of Esters with Cellulosic Insulation Materials 3.1 Introduction 3.2 Procedure of Accelerated Thermal Aging 3.3 Assessment of Liquid Degradation 3.4 Assessment of Paper Degradation 3.5 Remaining Life of Transformer Insulation 3.6 Conclusions References

      13  4 Degradation Assessment of Ester Liquids 4.1 Introduction 4.2 Procedure of Accelerated Thermal Aging 4.3 Assessment of Liquid Degradation 4.4 Assessment of Paper Degradation 4.5 Conclusions and Future Scope References

      14  5 End Life Behavior of Ester Liquids in High‐Voltage Transformers 5.1 Introduction 5.2 Evolution of Colloidal and Soluble Decay Particles 5.3 Colloidal Particles – Centrifugal Treatment (ASTM D1698) 5.4 Soluble Particles – Fuller's Earth Filtration (ASTM D7150) 5.5 Feasibility of Fuller's Earth Filtration for Ester Liquids 5.6 Conclusions and Future Scope References

      15  6 Prebreakdown and Breakdown Phenomena in Ester Dielectric Liquids 6.1 Introduction 6.2 Research Methods in Assessment of Prebreakdown Phenomena in Ester Liquids 6.3 Initiation of Streamers in Dielectric Liquids 6.4 Streamer Propagation 6.5 Influence of Temperature on Prebreakdown Phenomena in Natural Ester Liquids 6.6 Influence of Thermal Aging on Prebreakdown Phenomena in Synthetic Ester Liquids 6.7 Conclusions and Future Scope References

      16  7 Miscibility and Engineering Application of a Novel Mixed Fluid 7.1 Introduction 7.2 Need and Research Progress of Mixed Insulating Liquids 7.3 Preparation Method for the New Mixed Insulating Oil 7.4 Thermal Aging Characteristics of the New Mixed Insulation Oil–Paper Insulation and Its Delaying Thermal Aging Mechanism 7.5 Mechanism of Property Enhancement of the New Mixed Insulation Oil on Power Frequency Breakdown of Oil–Paper Insulation 7.6 Enhancing Effect and Mechanism of the New Mixed Insulation Oil on Flashover Voltage of Oil–Paper Insulation