Gaseous Dielectrics II focuses on the discussion of the progress and issues related with gaseous dielectrics, their efficient use by the electric power industry, and how they affect the environment. This book features contributors who have pursued extensive research on gaseous dielectrics. The discussion starts with a presentation of the fundamental physics covering the subject. In this regard, numerical analyses are presented to show the nature of gaseous dielectrics. This book then proceeds by presenting the fundamental mechanisms involving corona discharge and breakdown in air as well as discharge processes in SF6. Supporting the discussion are numerical calculations that show how the processes progress. A discussion of "new gaseous dielectrics¿ is also presented. In this consideration, the breakdown behavior of new gases and gas mixtures as well as their strength are elaborated. This topic is followed by the evaluation of the effect of surface defects on the breakdown of gases and gas mixtures. Another part of the book discusses the effects of conducting particles to gases and gas mixtures in gas-insulated systems. A discussion of the decomposition of gases and gas mixtures is presented, including high-voltage testing of gases and gas mixtures. The bioenvironmental effects of dielectric gases are also discussed. This selection is a valuable source of information for readers who are interested in studying the industrial utilization of gaseous dielectrics.

Chapter 1: Basic Physics of Gaseous Dielectrics Ionic and Electronic Processes in Sulfur hexafluoride Discussion Calculation of Electric Field-Induced Detachment Rate of Electrons from Mononegative Ions; Relevance to Gaseous Dielectrics Discussion Electron Swarm Data Relevant to High-Voltage Insulation Discussion A Critique of Methods for Calculating the Dielectric Strength of Gas Mixtures and a Proposed Test for ¿-Synergism DiscussionChapter 2: Basic Mechanisms: Corona and Breakdown in Air Zone of Influence of the Streamer at the Cathode of a Positive Point to Plane Corona Discharge in Air Discussion Relative Importance of Active Synchronous Component in the Current of a Corona Discharge Discussion Possible Interpretation of the Gas Discharge Structure in a Rod/Plane Gap Discussion Breakdown and V-I Characteristics of Dry Air Below Paschen Minimum in Crossed Electric and Magnetic FieldsChapter 3: Basic Mechanisms: Discharge Processes in SF6 Impulse Breakdown and Prebreakdown Corona Processes in SF6 and SF6/N2 Mixtures Discussion The Relation between Luminous Phenomena and Discharge Mechanism in SF6 Discussion Electrical Breakdown in Compressed SF6 Between Highly Polished Electrodes Discussion Effect of Polarity on the Breakdown Voltage of Gas Gaps DiscussionChapter 4: New Gaseous Dielectrics New Unitary and Multicomponent Gaseous Dielectrics Discussion The Breakdown Behavior of Some New Gases and Gas Mixtures in Uniform and Nonuniform Fields Discussion Electric Strength of Some Gases and Gas Mixtures Discussion DC Breakdown Strengths of Some Multicomponent Gas Mixtures in Concentric Cylinder Geometries Discussion Paschen Characteristics of Gases in Crossed Magnetic FieldChapter 5: Impulse Breakdown Electrical Breakdown Studies of SF6/CO2/Fluorocarbon Mixtures Discussion Impulse Breakdown of Corrugated Coaxial Electrodes in Compressed SF6 Discussion Impulse Breakdown of c-C4F8/SF6 and c-C4F8/SF6/N2 DiscussionChapter 6: Surface Effects Evaluation of the Effect of Surface Defects on Breakdown in Strongly Electronegative Gases or Gas Mixtures Discussion Influence of Coating Polished and Rough Electrodes on the Impulse and AC Breakdown of SF6 Electrode-Area and Surface-Roughness Effects on Breakdown of S F6/N2 Mixtures Discussion Flashover Studies in SF6-N2 Mixtures Using Direct Applied Voltages Discussion The Effect of Surface Roughness on the A C Corona Onset Voltage for Cylindrical Conductors in AirChapter 7: Effects of Particles Influence of Conductive Particles on the DC-Voltage Strength of Spacers in Compressed SF6 Discussion Influence of Conducting Particle Attached to an Epoxy Resin Spacer on the Breakdown Voltage of Compressed-Gas Insulation Discussion Effects of Particle Contamination in SF6 CGIT Systems and Methods of Particle Control and Elimination Discussion Particle Traps in Gas-Insulated Systems Discussion Electrostatics of Particle Control in Gas-Insulated ApparatusChapter 8: Decomposition, Aging, and Simulation Thermal Aging of Dielectric Gases Discussion Prediction of Electrical Breakdown Carbonization of Gases and Gas Mixtures Discussion Partial-Discharge Pulse Height Distributions and Frequencies for Positive and Negative DC Corona in SFc and SF6-N2 Mixtures Discussion The Application of Charge Simulation Method to Three Dimensional Asymmetric Field with Two Dielectric Media DiscussionChapter 9: Standards and Testing Test Electrodes for Measuring the Intrinsic Insulating Strength of Gases Discussion High Voltage Testing of Metal-Enclosed Gas-Insulated Substations On-site with Oscillating Switching Impulse Voltages Implications in Long-Term Field Testing of Gas-Insulated Equipment Discussion Transient High Voltages on the Grounded Enclosures of Gas-Insulated Transmission Equipment Discussion Partial Discharge Location in Gas-Insulated Switchgear Discussion The Measurement of DC Voltages up to 1 MV Using Sphere-Gaps and Rod-Gaps Switching Surge Discharge Characteristics of Large Conductor-Tower Air Gaps A Solution of Laplace's Equation for Hyperboloidal Electrodes with Applications to Dielectric Testing in Nonuniform Electric FieldsChapter 10: Gas-Insulated Equipment The Future Testing Needs of Gas-Insulated Substations Discussion Experimental Study of the Breakdown Characteristics of Large Scale Gas-Insulated Systems Discussion Partial Discharge Inception and Breakdown Studies on Model Sheet-Wound, Compressed SF6 Gas-Impregnated Polymer Film-Insulated Windings Discussion Dynamics of Power Arcs in Co-axial Electrode Geometry DiscussionChapter 11: Bioenvironmental Effects Aspects of Environmental Effects of Dielectric Gases Discussion Assessment of Potential Health Effects of Dielectric Gases Discussion The Toxicology of Certain Gaseous Fluorocarbons Discussion Testing and Evaluation of Chemical Hazards Under the Toxic Substances Control Act DiscussionChapter 12: Forums Forum I: Future Research Directions in Gaseous Dielectrics Forum II: Future Directions in Gas-Insulated ApparatusList of ParticipantsPhotographs of ParticipantsAuthor Index