14,324 resources related to Corona
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The purpose of this conference is to provide a platform for researchers, scientists and engineers from all over the world to exchange ideas and discuss recent progress in electrical insulation, dielectric and practical applications. The focus of the conference is on dielectrics, its phenomena and applications in developing technologies such as nanotechnology, dielectric for superconductivity, dielectric discharges and others.
Condition monitoring and diagnosis for power equipments and power systems,power plants, dielectric materials and their aging mechanisms, degradation assessment for power system, application of information and communication technologies for condition monitoring and diagnosis, tropical climate and other related issues including recycling, reuse and mitigation,strategic planning and management for condition monitoring and diagnosis.
The theme of this conference is Towards Smarter Resilient and Economic Power Systems . This is topical in the context of emerging trends of Smart Grids; resilience of electricity infrastructure to recent earthquakes, floods, nuclear-meltdown in the Asia-Pacifc region; and, trends towards Emission Trading Scheme and increased participation of private capital markets into electricity generation. A flavour of this theme in the context of New Zealand will be highlight to all our international participants.
2012 International Conference on High Voltage Engineering and Application (ICHVE)
This conference can provide an excellent platform to share knowledge and experiences on high voltage engineering, and present the advices on the construction and maintenance of UHV transmission lines in China.
Electrical insulation common to the design and construction of components and equipment for use in electric and electronic circuits and distribution systems at all frequencies.
The development and application of electric systems, apparatus, devices, and controls to the processes and equipment of industry and commerce; the promotion of safe, reliable, and economic installations; the encouragement of energy conservation; the creation of voluntary engineering standards and recommended practices.
Research, development, design, application, construction, the installation and operation of apparatus, equipment, structures, materials, and systems for the safe, reliable, and economic delivery and control of electric energy for general industrial, commercial, public, and domestic consumption.
Fundamental technologies used in the control and conversion of electric power. Topics include dc-to- dc converter design, direct off-line switching power supplies, inverters, controlled rectifiers, control techniques, modeling, analysis and simulation techniques, the application of power circuit components (power semiconductors, magnetics, capacitors), and thermal performance of electronic power systems.
Aerospace, IEEE Transactions on, 1965
Experimental measurements of electrical discharges caused by corona, glow discharges, and voltage breakdown were made under conditions encountered in aerospace vehicles operating within the 70,000 to 250,000 foot altitude range. All measurements were made in gases commonly used to pressurize spacecraft electrical and electronic compartments: nitrogen, nitrogenoxygen mixtures, and normal atmosphere at sea-level pressure. Test results show that: (1) the ...
Industry Applications Society Annual Meeting, 1991., Conference Record of the 1991 IEEE, 1991
A novel plasma chemical process PPCP (pulse corona induced plasma chemical process) can produce copious active radicals in air under NTP by using an extremely fast-rising narrow pulse high voltage between corona electrodes and grounded counter electrodes so that the intense streamer coronas are generated. this provides an effective means of surface treatment to a plastic material placed between the ...
Electrical Insulation and Dielectric Phenomena, 2009. CEIDP '09. IEEE Conference on, 2009
Experimental investigations and cross sectional averaged one-dimensional analyses of a wire-rod type electrohydrodynamic (EHD) gas pump have been conducted. The EHD gas pump was made of an acrylic pipe (20 mm inner diameter, 220 mm long) with a wire electrode 60 Â¿m in diameter and a rod electrode 3 mm in diameter. Applying a dc high voltage between these electrodes, ...
Photonics Technology Letters, IEEE, 2006
The structure of fiber Bragg gratings inscribed point-by-point by an infrared femtosecond laser is studied by quantitative phase microscopy. Results show that these gratings present a central region with a depressed refractive index surrounded by an outer corona with increased refractive index. The refractive index profile suggests the presence of microvoids embedded in a region of the core
Dielectrics and Electrical Insulation, IEEE Transactions on, 2010
The paper reports about the role of humidity on the breakdown of air in non- uniform fields at 30 kHz - a frequency within the VLF/LF bands used for long distance communication. Experiments were conducted using rod/rod and rod/plane configurations with gap lengths ranging from 8 to 1000 mm. The results indicate that the breakdown voltage at 30 kHz is ...
Walter V. Inkis IEEE Transactions on Power Apparatus and Systems, 1978
Attempts to accurately communicate the effects encountered under or near EHV transmission lines has been a problem leading to various public misconceptions or exaggerations. In response to this problem, Ontario Hydro has set up a public demonstration site under operating 500 kV lines to show the electrostatic, electromagnetic and corona effects on vehicles, buildings, fencing, personnel, livestock, plants and radio ...
A. Tripathi; A. K. Tripathi; T. C. Goel; P. K. C. Pillai 9th International Symposium on Electrets (ISE 9) Proceedings, 1996
Nb+5 doped PZT ceramic has been prepared by conventional solid solution technique. The doping has been carried out at A-site by varying the dopant concentration from 2.5% to 7.5%. The X-ray diffractograms of these samples show tetragonality with c/a ratio close to unity. The dielectric measurements do not show any Curie transition upto 160°C. It was found that the dielectric ...
A. J. Wallash IEEE Transactions on Magnetics, 1997
A methodology and apparatus are described for completely characterizing the electrostatic discharge (ESD) sensitivity of magnetoresistive (MR) recording heads. ESD testing of MR heads from six vendors was performed and a "Human Body Model" (HBM) failure voltage as low as 85 V was measured. Air gap breakdown voltages ranging from 400 V to 1100 V were also found. Two new ...
Alan H. Cookson; Roy E. Wootton IEEE Transactions on Power Apparatus and Systems, 1978
The ac corona onset and breakdown voltages have been measured for rod-plane and rod-rod gaps in hydrogen, SF6, and hydrogen-SF6 mixtures for pressures between 1 and 5 bar, with gaps up to 14 cm, and voltages up to 250 kV rms. The addition to hydrogen of quantities of SF6 as low as 0.002% by volume resulted in a substantial increase ...
P. Ortéga 2008 17th International Conference on Gas Discharges and Their Applications, 2008
On the one hand, an empirical quadratic relationship between the charge Qi of the first impulse corona and the associated inception voltage Ui has been recently proposed for a 1m point-plane airgap submitted to impulse voltages. On the other hand, different models have been proposed to evaluate that relation for coaxial geometries also submitted to impulse voltages. The aim of ...
Electron impact ionization is the mainstay for plasma-based flow control actuators because it actuates in less than microseconds and the electrode configuration can be made nonintrusive to oncoming stream. In addition, when the actuator is not needed, unlike most mechanical flow control devices, it will not be parasitic and degrade performance of aerospace vehicles. The space charges induce an additional electric field potential that makes it different from the corona discharge. This chapter presents the best physics-based, multifluid model for the electron impact ionization. The physics for electron impact ionization is well known through the luminary contributions by Townsend, the ionization is evolving from the electrons collision, secondary emission, and avalanche. The secondary emission from cathode arises as controlling mechanism for all electron impact ionization. A high concentration of positive charges over an electrode creates an extremely high electrical field potential, which is comparable to the magnitude in a nuclei.
High-power electromagnetics (HPE) treats the common characteristics of those areas of electromagnetics that require consideration of nonlinear processes in the generation or coupling of the HPE fields. Predictions of HPE processes normally require simultaneous solution of Maxwell's equations and equations governing the behavior of the air or other gas in breakdown conditions. That breakdown is in response to the local fields in the air, and can be enhanced by geometry. Common sources of these high fields include lightning, electromagnetic pulse and related phenomena, high-power microwave sources, and other discharges, including electrostatic discharge (ESD). The discharges may take the form of a corona or a long spark. They may be enhanced by local ionizing conditions, like those caused by a nuclear explosion or within a thundercloud. This paper will review the basic concepts and applications of HPE and present some examples.
This chapter contains sections titled: Fundamentals of Field Assisted Generation of Charge Carriers Breakdown of Atmospheric Air in Uniform and Weakly Nonuniform Fields Breakdown in Extremely Nonuniform Fields and Corona Electric Arcs and Their Characteristics Properties of Sulphurhexafluoride, SF6 Gas and Its Application in Electrical Installations References
This chapter contains sections titled: Cleanliness of Bore Air/Gas Ducts Clogged/Unclogged Iron Oxide Deposits Hardware Condition High-Voltage Bushings Stand-Off Insulators Bushing Vents Greasing/Red Oxide Deposits on Core Bolts and Spring Washers Space Heaters Fan-Baffle Support Studs Heat Exchanger Cleanliness and Leaks Hydrogen Desiccant/Dryer Core-Compression (ldquo;Bellyrdquo;) Belts Bearing Insulation (at Pedestal or Babbitt) Coil Cleanliness (including water cooled windings) Blocking Condition Ties Between Coils Ties to Surge-Rings Surge-Ring Insulation Condition Surge-Rings Support Assembly Additional End-Winding Support Hardware RTDs and TCs Wiring Hardware Asphalt Bleeding/Soft Spots Tape Separation/Girth Cracking Insulation Galling/Necking Beyond Slot Insulation Bulging into Air Ducts Insulation Condition Circumferential Bus Insulation Corona Activity Wedges Condition Wedges Slipping Out Fillers Slipping Out Bars Bottomed in Slot Laminations Bent/Broken in Bore Laminations Bulging into Air Ducts Terminal Box Current Transformer (CT) Condition Bushing-Well Insulators and H2 Sealant Condition End-Winding Expansion-Bearing-Bolts Condition (Round-Rotor Mach ines) This chapter contains sections titled: References
This chapter contains sections titled: Automatic Extraction of Filaments Solar Flare Detection Solar Corona Mass Ejection Detection References
Natural phenomena, such as gamma rays produced by radioactive decay processes in the soil and cosmic radiation originating from solar flares and other galactic objects, can ionize the air molecules. This chapter first discusses ionization and deionization processes in gases. This is followed by a discussion on ionization and attachment coefficients. Two typical breakdown mechanisms occur in gases, each of them operating under specifically favorable conditions: Townsend's mechanism and the streamer mechanism. Corona discharges in air can burn on the overstressed zones of hot electrodes. This kind of discharge occupies a short layer, attached to the energized conductor. When a conductor is in corona, then the electric field on the surface is somehow influenced by the surrounding ion space charge. Kaptzov's hypothesis (KH) relates to the assumption that the space charge emitted into the interelectrode gap is in amounts that hold the surface field at the onset level.
This chapter contains sections titled: Automatic Speech Recognition Takes Off, Making Things Real, Speaking to Your Personal Computer, The Wildfire Effect, Why Don't You Just Tell Me?, Controlling Errors, Corona and Altech, Nuance and SpeechWorks, The Art of Speech Design, Inviting Computers to Dinner, Products and Solutions, How May I Help You?
This chapter reviews representative applications of the finite-difference time domain method (FDTD) method to lightning electromagnetic pulse and surge simulations. The applications reviewed include lightning electromagnetic fields at close and far distances, lightning surges on overhead power transmission line (TL) conductors and towers, lightning surges on overhead distribution and telecommunication lines, the lightning electromagnetic environment in power substations, and lightning surges in wind-turbine- generator towers. It also includes lightning surges in photovoltaic arrays, the lightning electromagnetic environment in electric vehicles, the lightning electromagnetic environment in airborne vehicles, lightning surges and electromagnetic environment in buildings, and surges on grounding electrodes. When an overhead ground wire of a TL is struck by lightning, corona discharge will occur on this wire. Corona discharge around the ground wire reduces its characteristic impedance and increases the coupling between the ground wire and phase conductors.
This chapter contains sections titled: Electric Charge and Discharge Electric and Magnetic Fields and Electromagnetics Dielectric and Electrical Insulation Electrical Breakdown Corona, Streamer and Aurora Capacitance and Capacitor References
The amount of available experimental data concerning corona originated space- charge flows is large; however, there is a persistent need for exploring the still overlooked or underestimated supplementary performances. These can emerge from special ion-flow field structures and can be monitored while changing pivotal geometrical parameters one at a time. Owing to the informative character of some individual sources, a demanding experimental strategy has been adopted for making the investigation on unipolar ion flows as complete as possible. A number of sources have been categorized, in this chapter, in function of the injection system and methodically monitored. Therefore, a suspended electrode becomes a V-shaped wire, a two-conductor bundle, an inclined rod, a partially sheathed wire, a pointed-pole sphere and a straight wedge. A 3D generalization of the experimentally discovered performances is given in light of the deep connection between the acknowledged general character of the homeomorphism and the notion of invariance.
This guide covers the detection of corona (partial discharge) and the measurement of its magnitude in electronics transformers. Test conditions, test apparatus, and test requirements are included.
Provide a guide for the measurement of partial discharges on all types of power system switchgear rated 1000 volts and above. The guide will include specific methods of test circuit/specimen calibration to ensure accurate,repeatable measurements may be made for the wide range of apparatus size, insulation types and apparatus capacitance.
The document defines terms related to the areas of corona and the electromagnetic environment of overhead power lines. Its scope is to define the most widely used terms specific to or associated with overhead power-line corona and fields. This includes terms used in electric and magnetic fields, ions, radio frequency propagation, electromagnetic signals and noise, audible noise, coupled voltages and ...