Gas Insulated Transmission Lines (GIL) / Wiley - IEEE (ePub)

Foreword xiii Acknowledgements xv 1 Introduction 1 1.1 Changing Electric Power Supply 1 1.2 Advantages of GIL 4 2 History 7 2.1 Transmission Network Development 7 2.2 Historical Development of GIL 20 3 Technology 39 3.1 Gas Insulation 41 3.1.1 Free Gas Space 42 3.1.2 Insulators 42 3.1.3 Gas-Tight Enclosure 44 3.1.4 Insulating Gases 46 3.2 Basic Design 65 3.2.1 Overview 65 3.2.2 Dielectric Dimensioning 68 3.2.3 Thermal Dimensioning 68 3.2.4 Insulation Coordination 68 3.2.5 Electrical Optimization 69 3.2.6 Transmission Network Studies 69 3.2.7 Gas Pressure Dimensions 70 3.2.8 High-Voltage Design Tests 70 3.2.9 Current Rating Design 72 3.2.10 Short-Circuit Rating Design 73 3.2.11 Internal Arc Design 74 3.2.12 Electromagnetic Current Forces Design 76 3.2.13 Mechanical Design 76 3.2.14 Integrated Overvoltage Protection 77 3.2.15 Particles 78 3.2.16 Thermal Design 79 3.2.17 Seismic Design 86 3.3 Product Design 93 3.3.1 Technical Data 93 3.3.2 Conductor Pipe 95 3.3.3 Enclosure Pipe 95 3.3.4 Size of Gas Compartment 97 3.3.5 Insulators 98 3.3.6 Sliding Contacts 100 3.3.7 Modular Design 100 3.3.8 Overhead Line Connection 103 3.3.9 Bending Radius 103 3.3.10 Joint Technology for Conductor and Enclosure 104 3.3.10.1 Flanged Joints 105 3.3.11 Corrosion Protection 112 3.3.12 On-Site Assembly Work 116 3.3.13 Monitoring 117 3.4 Quality Control and Diagnostic Tools 123 3.4.1 Quality of Parts 124 3.4.2 Quality of Processes 124 3.4.3 Partial Discharge Detection 125 3.4.4 High-Voltage Testing On-Site 126 3.4.5 Conclusion of Quality Control 130 3.5 Planning Issues 131 3.5.1 Network Impact 131 3.5.2 Reliability 139 3.5.3 Grounding/Earthing 141 3.5.4 Safety 141 3.5.5 Environmental Limitations 143 3.5.6 Electric Phase Angle Compensation 145 3.5.7 Loadability and Capability Overload 145 3.6 Specification Checklist 149 3.7 Laying Options 153 3.7.1 General 153 3.7.2 Above-Ground Installation 154 3.7.3 Trench-Laid 159 3.7.4 Tunnel-Laid 160 3.7.5 Directly Buried 166 3.7.6 Directional Boring 182

Hermann J. Koch, Principle Expert, Power Transmission, Siemens, Germany
Mr Koch currently works in the field of high voltage switchgear and high voltage transmission lines with Siemens in Germany. He became Principal Expert after over-seeing the installation of the first second generation GIL (gas insulated transmission lines) in Geneva, Switzerland in 2001. Since then he has worked on many projects with Siemens. Mr Koch created a successful tutorial Gas Insulated Substations with the IEEE PES Substations Committee, which has been presented in more than twenty countries including the USA, Canada, South America and India.

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