Title 5th International Colloquium on Transformer Research and Asset Management Bojan Trkulja, Željko Štih, Žarko Janić, editors

Published Singapore : Springer, 2020

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Description 1 online resource (278 pages) Series Lecture Notes in Electrical Engineering Ser. ; v. 671 Lecture notes in electrical engineering ; v. 671. Contents Intro -- About This Book -- Contents -- About the Authors -- Relative Permittivity Assessment of Oil-Impregnated Cellulose Insulation -- 1 Introduction -- 2 Relative Permittivity of Oil-Impregnated Material -- 3 Electrochemical Impedance Spectroscopy -- 4 Measurement Procedure -- 5 Measurement Results -- 6 Analysis -- 7 Conclusion -- References -- Difference Between 50 and 60 Hz Transformer No-Load Noise Levels -- 1 Introduction -- 2 Predictable Effects on Sound Power Levels -- 3 Sum of Predictable Effects on Sound Power Levels 4 Additional Noise Measurements at Different Supply Frequencies -- 5 Unpredictable Effects on Sound Power Levels -- 6 Conclusions -- References -- Reproducibility Estimation of Sound Power Level of Large Power Transformers -- 1 Introduction -- 2 Total Standard Measurement Uncertainty Versus Total Standard Deviation of Reproducibility -- 3 Measurement Uncertainty of Sound Pressure Level, Point-to-Point Procedure -- 4 Measurement Uncertainty of Sound Pressure Level, Walk-Around Procedure -- 5 Measurement Uncertainty of Sound Intensity Level, Point-to-Point Procedure 6 Measurement Uncertainty of Sound Intensity Level, Walk-Around Procedure -- 7 Total Standard Deviation of Reproducibility of Sound Power Level -- 8 Total Standard Deviation of Reproducibility of Sound Power Level in Short-Circuit Condition at It ≠ In -- 9 Measurement Uncertainty or Reproducibility in Decision-Making and Conformity Assessment -- 10 Results and Discussion -- 11 Conclusion -- References -- Stressed Oil Volume Theory in Transformer Winding Corner Stress Analysis -- 1 Introduction -- 2 Combined Stress Research 3 Electric Field Distribution Calculations and Stressed Oil Volume Definition -- 4 Analysis of Radial Electric Field Influence on Withstand LI Voltage -- 5 Conclusion -- References -- Synthetic Ester Impact on Power Transformer Design, Manufacturing and Testing -- 1 Introduction -- 2 Insulation Design -- 3 Thermal Design Impact -- 4 Fire Safety and Environmental Recommendations for Ester Filled Transformers -- 5 Built in Material and Components Compatibility -- 6 Process and Manufacture -- 7 Conclusion -- References -- Future Trends in Transformer Online Monitoring -- 1 Introduction 2 Development Trends -- 3 Future of Transformer Monitoring -- 4 Conclusion -- References -- Optimal Cooling and Life Time Management for Power Transformers -- 1 Introduction -- 2 Transformer Modeling -- 2.1 Thermal Modelling Based on Standards -- 2.2 Cooling Regulation and Effect on Top Oil and Hot-Spot Rise -- 2.3 Losses Modeling -- 2.4 Ageing Rate Modelling -- 3 Ambient Air Temperature Modeling -- 3.1 Annual Temperature Evolution/Ombrothermic Diagrams and Modeling -- 3.2 Daily Temperatures Evolutions Modeling -- 4 Transient Moisture Modeling -- 5 Case Study Summary This book presents the proceedings of the 5th International Colloquium "Transformer Research and Asset Management," held in Opatija, Croatia, on October 9-12, 2019. The papers chiefly focus on three groups of topics: 1. Numerical Modeling: Electromagnetic fields--Coupled fields--Transients--Numerical modeling in design 2. Materials, Components and New Technologies: Insulating materials--Magnetic materials and transformer noise--Transformer components--New transformer technologies 3. Transformer Lifecycle Management: Diagnostics and monitoring--Failure--Asset management--In-service experiences. The Colloquium was organized by the Croatian National Committee of CIGRE together with the Faculty of Electrical Engineering and Computing in Zagreb and the Centre of Excellence for Transformers Notes 5.1 Calculation Cases and Main Findings Print version record Subject Electric transformers -- Congresses Energy technology & engineering. Electrical engineering. Technology & Engineering -- Power Resources -- General. Technology & Engineering -- Machinery. Electric transformers Genre/Form Electronic books proceedings (reports) Conference papers and proceedings Conference papers and proceedings. Actes de congrès. Form Electronic book Author Trkulja, Bojan Štih, Željko. Janić, Zarko ISBN 9789811556005 9811556008

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