Modelling of Vibrations of Overhead Line Conductors (eBook)

CIGRE Study Committee B2 is the CIGRE group of experts that facilitates and promotes the interchange of technical knowledge and information about Overhead Powerlines. It fosters the design, construction, and operation of overhead lines, including the mechanical and electrical design of line components, validation tests, study of in service performance, the assessment of the state of line components and elements, maintenance, as well as the refurbishment and life extension as well as upgrading and uprating of overhead lines. The output of the deliberations and actions would enable quality, capability, availability, maintainability, and the ability to raise capital and insurance to be realized.Giorgio Diana received his Degree in Mechanical Engineering from Politecnico di Milano in 1961.  Since 1971 he is a full professor of Applied Mechanics and in December 2010 he has been appointed Professor Emeritus of Politecnico di Milano. His actual main research fields are: bridges dynamics, railway vehicle - infrastructure dynamic interaction and aero-elasticity problems. He is presently chairing various scientific committees such as the Steering Committee of the Joint Research Centre (JRC) on Transportation, the Italcertifer Consortium Certification Committee, the Working Group on Super-long Span Bridge Aerodynamics of IABSE (International Association of Bridge Engineers) and the Working Group B2-58 (Vibration Modelling of High Temperature Low Sag conductors - Self-damping characterization) of  CIGRE (Conférence Internationale des Grandes Réseaux Electriques à Haute Tension).The results of the research and activities are reported in about 300 papers published mainly in international peer reviewed journals as well as in keynote lectures held at  several international conferences. As a result of his achievements Prof. Diana received in 2009 the Robert H. Scanlan Medal from the American Society of Civil Engineers (ASCE),  in 2012 the CIGRE Technical Committee Award, in 2014 the IAWE Senior Award with Davenport medal and, also in 2014, the European Railway Award from the Community of European Railway and Infrastructure Companies (CER) and from the European Rail Industry Association (UNIFE).

Foreword 6
Preface 8
Message from the Secretary General 10
Executive Summary 12
Contents 18
About the Editor 20
List of Symbols and Abbreviations 21
1 Modelling of Aeolian Vibrations of Single Conductors 23
1.1 Introduction 23
1.2 Laminar Wind Power Input 24
1.3 Conductor Self-damping 26
1.4 Comparison Between Experimental and Theoretical Results 31
1.5 Influence of Uncertainty About Self-damping and Power from Wind on the Analytical Prediction of Conductor Response 35
1.6 Conclusions 42
2 Modelling of Aeolian Vibrations of a Single Conductor Plus Damper 43
2.1 Introduction 43
2.2 Outline of the Methodology 44
2.3 Analytical Models Used in the Study 45
2.4 Benchmark Results 48
2.5 Discussion 55
2.6 Future Work 56
2.7 Conclusion 57
3 Modelling of Aeolian Vibrations of Single Conductors Strung at Relatively High Tensile Load 58
3.1 Introduction 58
3.2 Analytical Methods and Assumptions Used in the Study 59
3.3 Benchmark Results 61
3.4 Analytical–Analytical Benchmark 61
3.5 Discussion 66
3.6 Conclusions and Future Work 67
4 Modelling of Aeolian Vibrations of Bundled Conductors 68
4.1 Introduction 68
4.2 Analytical Methods and Assumptions Used in the Study 69
4.3 Benchmarks 72
4.4 Conclusions and Future Work 79
5 Modelling of Subspan Oscillations of Bundled Conductors 81
5.1 Introduction 81
5.2 Analytical Methods and Assumptions Used in the Study 83
5.3 Experimental and Analytical Benchmark: Description and Results 86
5.4 Conclusions 89
General Conclusions 91
References 93