Gaseous Dielectrics

Gaseous Dielectrics

Proceedings of the Fifth International Symposium on Gaseous Dielectrics, Knoxville, Tennessee, U.S.A., May 3—7, 1987

1st Edition - January 1, 1987

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  • Editors: Loucas G. Christophorou, Don W. Bouldin
  • eBook ISBN: 9781483191072

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Description

Gaseous Dielectrics V presents the proceedings of the Fifth International Symposium on Gaseous Dielectrics, held in Knoxville, Tennessee on May 3–7, 1987. This book discusses the effective coupling between basic and applied research and technology achieved in this area. Organized into 12 chapters, this book begins with an overview of the status of theoretical calculations of excitation and ionization coefficients for electrons. This text then provides an extensive investigation into different phases of discharge development in electronegative gases. Other chapters consider the use of sulfur hexafluoride as a dielectric medium in rail systems and gas circuit breakers. This book reviews as well the primary requirements for a successful gas analysis program, with emphasis on measurement and interpretation methods. The final chapter deals with the progress in dielectric quality assurance of gas insulated substations (GIS), which has resulted from improved scientific knowledge of significant phenomena. This book is a valuable resource for electrical and electronics engineers.

Table of Contents


  • Chapter 1: Basic Physics of Gaseous Dielectrics

    Excitation and Ionization Coefficients

    Discussion

    Laser-Enhanced Electron Attachment and Its Possible Application for Optical Switching

    Discussion

    Galvanooptical Measurement of Photodetachment from Negative Ion Swarms in Oxygen

    Discussion

    Electron Collision Cross Sections for C2F6 and N2O

    Discussion

    A Macroscopic Model of Electron Swarm Motion in Non-Equilibrium Regions

    Non-Equilibrium Description of Electrons in a Gas Influenced by Space-Time Varying Electric Fields

    Temperature Dependent Electron Transport and Rate Coefficient Studies for e-Beam-Sustained Diffuse Gas Discharge Switching

    Time Dependent Conductivity Studies of Electron Thermalisation in Simple Gases

    Chapter 2: Basic Mechanisms

    Breakdown Mechanisms in Electronegative Gases

    Discussion

    Predischarge Development in N2 and SF6 at High Gas Pressures

    Discussion

    Effect of Temperature on the Uniform Field Breakdown Strength of Electronegative Gases

    Discussion

    The Influence of Thermal Ionization on Electrical Breakdown

    Discussion

    Contribution to a Unified Theory of the Leader Processes

    Discussion

    Mechanism of a Short Gap Breakdown

    Experimental Investigation of the Streamer to Leader Transition in SF6 Under Negative Polarity

    Modeling of Leader Branching in Electronegative Gases

    The Leader Inception Characteristics in Positive Sphere-Plane Air Gaps

    Velocity Measurements in Mixtures of SF6 and N2 in Non-Uniform Field Gaps Under Positive Impulse Voltage

    Chapter 3: Gas Decomposition/Reacnons/Toxicity

    Decomposition of SF6 by Arc Discharge and the Determination of tne Reaction Product S2F10

    Discussion

    Corona-Induced Decomposition of Dielectric Gases

    Discussion

    Investigations of the Toxicological Action of Spark-Decomposed SF6 in Mammalian Cells

    Discussion

    Degradation of the Dielectric Properties of SF6 Due to the Presence of Gaseous Impurities; Deviations of the "Paschen's Law" at High Pressures for Positive Polarity

    Discussion

    The Influence of Impurities on the Dielectric Strength of SF6 for Positive Polarity; The Nature of Initiatory Electrons

    Formation and Stability of SF5 and S2F10

    SOF4 Production in Spark Breakdown of SF6/O2 Mixtures

    Assay of SF6 and Spark-Decomposed SF6 for Mutagenic Activity in the CHO/HGPRT Mammalian Cell System

    Chapter 4: Diagnostics/Field Probes

    Gas Analysis as a Diagnostic Tool for Gas-Insulated Equipment

    Discussion

    On the Possibility of Diagnostics of GCB and GIS by Gas Chromatography

    Discussion

    On the Electrostatics of Probe Measurements of Surface Charge Densities

    Discussion

    Measurement of Accumulated Charge on Dielectric Surfaces with an Electrostatic Probe

    Discussion

    The Effect of Humidity on Space Charge Growth in Short Air Gaps

    Laser Probing of Air Gaps Under AC Conditions

    Chapter 5: Gases/Mixtures for GIS Transformers and Circuit Breakers

    Predicting the Breakdown Strength of Mixtures from Basic Data

    Discussion

    The Dielectric Strength of Dichlorotetrafluoroethane (1,2-C2Cl2F4) Determined in a Combined Swarm/Breakdown Study

    Discussion

    The Influence of Gaseous Admixtures to SF6 on the Corona Stabilized Regime at AC and at Positive Impulse Voltage

    Discussion

    Nonuniform Field Corona and Breakdown Characteristics of SF6/Freon Mixtures

    Discussion

    Effect of a Trichlorotrifluoroethane Vapor Additive on Dielectric Strength of SF6 Gas

    Measurement of the Figure of Merit M for Several Perfluorocarbon Gases

    Breakdown Voltage Measurement of Some Vapor-Mist Dielectrics

    Chapter 6: Gaseous Media for Discharge Chemistry and Etching/Coron

    Gaseous Media for Plasma Chemistry and Etching

    Discussion

    Practical Implications of Dry Plasma Processing

    Discussion

    Important Considerations for Optimizing Production Rates in RF Discharge Chemistry

    Discussion

    Negative DC Corona Discharge in SF6 for Highly Divergent Fields

    Discussion

    Calculation of Corona Onset Voltage with Space Charge Effect

    DC Corona Control in Coaxial Gas Insulating Systems

    Chapter 7: Gas Engineering for Pulsed Power and Switching

    Gas Engineering for Pulsed Power and Switching

    Discussion

    Penning Ionization Ternary Gas Mixtures for Diffuse Discharge Opening Switches

    Discussion

    Gas Mixtures for Spark Gap Closing Switches with Emphasis on Efficiency of Operation

    Discussion

    The Influence of Transverse Magnetic Fields on Glow Discharges in He/SF6 Gas Mixtures

    Discussion

    Analysis of the Cathode Fall of Glow Discharges in a He/SF6 Gas Mixture

    Gas Engineering Studies for High Pressure Self-Sustained Diffuse Discharge Closing Switches

    Diffuse Discharges in High-Pressure Mixtures of c-C4F8 and He

    Chapter 8: Gas Breakdown Under Steep-Fronted Voltages

    Statistical Breakdown Process in SF6 and Breakdown Voltage Calculations

    Discussion

    Formative Time Lags in SF6-N2 Gas Mixtures for Different Field Distribution

    Discussion

    Voltage-Time Characteristics of Impulse Breakdown in SF6 Gas

    Discussion

    Spacer Flashover Time Lags in SF6 Under Fast-Front Impulse Voltages

    Discussion

    Breakdown Volt-Time Characteristics in SF6 Mixtures for a Coaxial Cylinder Gap

    Effect of Field Divergence on the Lightning Impulse Breakdown of Rod-Plane Gaps in N2/SF6 Mixtures

    Free Particle Initiated Breakdown of SF6 Under Voltages of Different Time Dependence

    Chapter 9: New Developments in Gas-Insulated Equipment/Gas Handling

    Development of ±500 kV HVDC Gas-Insulated Switchgears

    Discussion

    A Manufacturer's Experience in the Cyclic Use of SF6 Gas

    Discussion

    Volt-Time Curves of Disconnector-Generated Fast Transients inside GIS

    Discussion

    Insulation Characteristics of Separate Cooling Sheet Winding-Type Gas-Insulated Transformer

    Discussion

    Recovery Strength of SF6-Insulated Gaps Stressed by Double Lighting Impulse Voltages

    Conduction Currents in Gas-Insulated Switchgear for Low Level DC Stress

    Effects of Electrode Surface Roughness on Dark Current and Switching Impulse Breakdown Voltage in Compressed SF6 Gas

    Mixing Rates and Diffusion of Various Gases and Moisture into SF6

    Chapter 10: Gas/Insulator Interface/Flashover

    Surface Changes Induced by Low Kinetic Energy Products from Corona Discharge on Epoxy Resin in Air

    Discussion

    Avalanches Near a Dielectric Spacer in Nitrogen Gas

    Discussion

    Measurement of the Temporal Decay of Charges on Insulator Surfaces

    Discussion

    Effect of Ribs on Surface Discharge in SF6 Gas

    Discussion

    Application of ESCA in GIS Spacer Surface Analysis

    Discussion

    Study of the Charge Build-Up on Dielectrics Submitted to Corona Discharge and Ageing Effects

    Influence of 60 Hz AC Charging of Spacers on Subsequent Impulse Flashover in Compressed SF6

    Surface Flashover of Polyester, Polypropylene, and Teflon Films in Low Pressure SF6 and N2 Media

    Research on Conductor-Plane Long-Gap Characteristics by Surface Discharge Analogy Model

    The Surface and Volume Effects of Interactions of Internal Partial Discharges with Solid Dielectrics

    Chapter 11: Quality Control in Testing Gas-Insulated Apparatus

    Fundamental Knowledge and the Testing of GIS

    Discussion

    Flashover Damage Test Procedure for Insulating Materials in Compressed SF6

    Discussion

    Strength of Typical GIS Configurations with Special Reference to Composite and Combined Stresses

    Discussion

    Limits to Partial Discharge Detection

    Discussion

    Broad Band Pulse Detection Studies of Corona and Breakdown in Air, N2, O2, CO2, SF and SF6-N2 Mixtures

    Chapter 12: Reports of Discussion Groups

    Group Discussion on New Diagnostic Techniques

    Group Discussion on Gas-Insulated Transformers and DC GIS

    Group Discussion on Gas Engineering for Modern Technologies: Input from Basic Research

    List of Participants

    Photographs of Participants

    Author Index

Product details

  • No. of pages: 702
  • Language: English
  • Copyright: © Pergamon 1987
  • Published: January 1, 1987
  • Imprint: Pergamon
  • eBook ISBN: 9781483191072

About the Editors

Loucas G. Christophorou

Don W. Bouldin

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