Advances in High Voltage Insulation and Arc Interruption in SF6 and Vacuum

1st Edition - January 1, 1981
Authors: V. N. Maller, M. S. Naidu
Language: English
eBook ISBN:
9 7 8 - 1 - 4 8 3 1 - 5 7 6 5 - 8

Advances in High Voltage Insulation and Arc Interruption in SF6 and Vacuum deals with high voltage breakdown and arc extinction in sulfur hexafluoride (SF6) and high vacuum, with… Read more

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Advances in High Voltage Insulation and Arc Interruption in SF6 and Vacuum deals with high voltage breakdown and arc extinction in sulfur hexafluoride (SF6) and high vacuum, with special emphasis on the application of these insulating media in high voltage power apparatus and devices. The design and developmental aspects of various high voltage power apparatus using SF6 and high vacuum are highlighted. This book is comprised of eight chapters and opens with a discussion on electrical discharges in SF6 and high vacuum, along with the properties and handling of SF6 gas. The following chapters focus on high voltage breakdown and arc interruption in SF6 and in vacuum; various types of SF6 gas insulated circuit breakers and metal enclosed switchgear, together with their design considerations; and application of SF6 gas in some insulated equipments. The final chapter addresses the various problems relating to the development of vacuum switchgear and considers some solutions that led to the successful development of vacuum interrupters of acceptable quality. This monograph will be of direct use to engineers in industry and those with electricity supply and utility establishments, as well as graduate students and research workers who want to familiarize themselves with the investigations and the results on the various phenomena relating to SF6 and high vacuum and their practical applications.

1. Properties and Handling of SF6 Gas Introduction General Properties Physical Properties Chemical Properties Heat Transfer Properties Toxicity Electrical Properties Handling of SF6 Gas Filling with SF6 Gas Absorption of Decomposition Products References2. High Voltage Breakdown in SF6 Gas Introduction Breakdown Mechanism Uniform Field Breakdown in SF6 Corona and Non-uniform Field Breakdown Estimation of Breakdown Voltage in Practical Systems Breakdown of SF6 in Mixtures with Other Gases Particle Initiated Breakdown Factors Affecting the Breakdown Strength of SF6 Gas Surface Flashover over Insulating Spacers in SF6 References3. Arc Interruption in SF6 Introduction Fundamental Arc Phenomena Plain Break Arcs in SF6 Blast Arcs in SF6 Current Chopping in SF6 Current Research on Arc Interruption in SF6 Arc Interruption in SF6-Other Gas Mixtures4. SF6 Gas Insulated Switchgear Introduction Advantages of SF6 Circuit Breakers Double Pressure Type Circuit Breakers Puffer Type Circuit Breakers (Up to 765 kV) Design Considerations of Puffer Circuit Breakers Operating Mechanism for Puffer Type Circuit Breakers Interrupter Geometries Design of Nozzle Geometry Self Extinction Type Circuit Breakers Maintenance Requirements and Reliability Future Trends of SF6 Gas Circuit Breakers SF6 Metal Enclosed Switchgear Advantages of SF6 Insulated Substations Requirements of SF6 Insulated Metal Clad Switchgear General Design Considerations Designs of Gas Insulated Switchgear and Components Description of Gas Insulated Switchgear and Components SF6 Gas Filling SF6 Gas Handling Plant Insulation Co-ordination for Gas Insulated Substations Future Trends of GIS References5. SF6 Gas Insulated Equipments Introduction SF6 Gas Insulated Cables SF6 Gas Insulated Current Transformers Bushings for SF6 Technique General Testing techniques of SF6 Insulated Power Apparatus References6. High voltage breakdown in vacuum Introduction Electron Emission in the Presence of Strong Electric Fields Pre-breakdown Phenomena in Vacuum Breakdown Mechanism Other Factors Affecting the Breakdown Strength of a Vacuum Gap Breakdown Across Solid Insulating Spacers in Vacuum Conclusions References7. Arc Interruption in Vacuum Introduction General Description of a Vacuum Arc Cathode Phenomena Vacuum Arc Plasma Anode Phenomena Arc Recovery Phenomena in Vacuum Future Work8. Vacuum Switchgear Introduction Advantages of Vacuum Interruption Vacuum Contactors and Interrupters Description of Vacuum Switches Operating Mechanisms for Vacuum Contactor Operating Mechanisms for Vacuum Interrupters Contact Materials for Vacuum Interrupters Contact Geometry for Vacuum Interrupters Manufacturing Techniques Applications of Vacuum Switchgear Maintenance of Vacuum Switchgear ReferencesAppendix to Chapter 1AppendixSubject Index