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

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

1st Edition - January 1, 1981

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  • Authors: V. N. Maller, M. S. Naidu
  • eBook ISBN: 9781483157658

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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.

Table of Contents

  • 1. Properties and Handling of SF6 Gas


    General Properties

    Physical Properties

    Chemical Properties

    Heat Transfer Properties


    Electrical Properties

    Handling of SF6 Gas

    Filling with SF6 Gas

    Absorption of Decomposition Products


    2. High Voltage Breakdown in SF6 Gas


    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


    3. Arc Interruption in SF6


    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 Mixtures

    4. SF6 Gas Insulated Switchgear


    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


    5. SF6 Gas Insulated Equipments


    SF6 Gas Insulated Cables

    SF6 Gas Insulated Current Transformers

    Bushings for SF6 Technique

    General Testing techniques of SF6 Insulated Power Apparatus


    6. High voltage breakdown in vacuum


    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



    7. Arc Interruption in Vacuum


    General Description of a Vacuum Arc

    Cathode Phenomena

    Vacuum Arc Plasma

    Anode Phenomena

    Arc Recovery Phenomena in Vacuum

    Future Work

    8. Vacuum Switchgear


    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


    Appendix to Chapter 1


    Subject Index

Product details

  • No. of pages: 292
  • Language: English
  • Copyright: © Pergamon 1981
  • Published: January 1, 1981
  • Imprint: Pergamon
  • eBook ISBN: 9781483157658

About the Authors

V. N. Maller

M. S. Naidu

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