Corona

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A corona is a type of plasma "atmosphere" of the Sun or other celestial body, extending millions of kilometers into space, most easily seen during a total solar eclipse, but also observable in a coronagraph. (Wikipedia.org)






Conferences related to Corona

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2020 IEEE International Conference on Plasma Science (ICOPS)

IEEE International Conference on Plasma Science (ICOPS) is an annual conference coordinated by the Plasma Science and Application Committee (PSAC) of the IEEE Nuclear & Plasma Sciences Society.


2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)

The world's premiere conference in MEMS sensors, actuators and integrated micro and nano systems welcomes you to attend this four-day event showcasing major technological, scientific and commercial breakthroughs in mechanical, optical, chemical and biological devices and systems using micro and nanotechnology.The major areas of activity in the development of Transducers solicited and expected at this conference include but are not limited to: Bio, Medical, Chemical, and Micro Total Analysis Systems Fabrication and Packaging Mechanical and Physical Sensors Materials and Characterization Design, Simulation and Theory Actuators Optical MEMS RF MEMS Nanotechnology Energy and Power


2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)

Photovoltaic materials, devices, systems and related science and technology


2019 IEEE 58th Conference on Decision and Control (CDC)

The CDC is recognized as the premier scientific and engineering conference dedicated to the advancement of the theory and practice of systems and control. The CDC annually brings together an international community of researchers and practitioners in the field of automatic control to discuss new research results, perspectives on future developments, and innovative applications relevant to decision making, systems and control, and related areas.The 58th CDC will feature contributed and invited papers, as well as workshops and may include tutorial sessions.The IEEE CDC is hosted by the IEEE Control Systems Society (CSS) in cooperation with the Society for Industrial and Applied Mathematics (SIAM), the Institute for Operations Research and the Management Sciences (INFORMS), the Japanese Society for Instrument and Control Engineers (SICE), and the European Union Control Association (EUCA).


2019 IEEE AUTOTESTCON

AUTOTESTCON is the world’s premier conference that brings together themilitary/aerospace automatic test industry and government/military acquirers and usersto share new technologies, discuss innovative applications, and exhibit products andservices.

  • 2018 IEEE AUTOTESTCON

    AUTOTESTCON is the world’s premier conference that brings together the military/aerospace automatic test industry and government/military acquirers and users to share new technologies, discuss innovative applications, and exhibit products and services

  • 2017 IEEE AUTOTESTCON

    IEEE AUTOTESTCON is also known as the Systems Readiness Technology Conference. This major conference and exposition provides focus on the maintenance aspects of systems readiness and providing Mission Assurance through Advanced ATE (Automatic Test Equpmenrt/Systems). This includes Maintenance Repair & Overhaul as well as factory and development automated test equipment. This conference brings military and aerospace industry principals together to share new concepts, technologies and applications in this essential field of supportability and sustainability. The conference includes a major exhibit of exciting new products from a wide variety of exhibitors, and provides the opportunity to meet with senior military and aerospace leaders to discuss their future needs and expectations and the ways in which we can satisfy those needs.

  • 2016 IEEE AUTOTESTCON

    echnical Interchange Meeting for military/aerospace automatic test industry together to share new technologies, discuss innovative applications, and exhibit products and services

  • 2015 IEEE AUTOTESTCON

    IEEE AUTOTEST is an annual Technical Interchange Meeting sponsored by the Institute of Electrical and Electronic Engineers (IEEE). This event serves to gather the military/aerospace automatic test industry together to share new technologies, discuss innovative applications, and exhibit products and services

  • 2014 IEEE AUTOTEST

    IEEE AUTOTESTCON is the world s only conference that focuses primarily on Automated Test and related technology for military, government and aerospace applications. The conference also has an expanded focus into commercial areas that share a common technical base, including aerospace, vehicle and automotive, and commercial factory test applications. Autotestcon provides a unique opportunity to discuss platform support requirements with all DoD Branches, provides hands-on experience with test equipment, and

  • 2013 IEEE AUTOTESTCON

    Content focused on automatic test systems for US military systems.

  • 2012 IEEE AUTOTESTCON

    Automated Test Systems (ATE) and related technologies such as Test Program Sets for US military and defense equipment

  • 2011 IEEE AUTOTESTCON

    Annual conference of the automatic testing industry.

  • 2010 IEEE AUTOTESTCON

    IEEE AUTOTESTCON, The Support Systems Technology Conference, is the largest conference focused on automatic test systems for military and aerospace systems, and has been held annually since 1965. It features more than 120 quality application-focused papers and 250 Exhibits. Attendance ranges between 650 and 750 registered professionals.

  • 2009 IEEE AUTOTESTCON

    Automated Test, Test Technology, and related Support Systems for Defense Systems.

  • 2008 IEEE AUTOTESTCON

    All theoretical and application aspects for an appropriate topic dealing with system readiness, in general, and automatic test technology, in particular. In keeping with our conference theme "Surpassing the Limits-Forging Ahead" our focus will be on new ideas and concepts, unusual testing solutions, and future technologies, e.g. ATE Architectures, Artificial Intelligence in Test, ATE/TPS Development Techniques, ATE/TPS Management, BIT/BIST

  • 2007 IEEE AUTOTESTCON

  • 2006 IEEE AUTOTESTCON

  • 2005 IEEE AUTOTESTCON

  • 2004 IEEE AUTOTESTCON

  • 2003 IEEE AUTOTESTCON

  • 2002 IEEE AUTOTESTCON

  • 2001 IEEE AUTOTESTCON

  • 2000 IEEE AUTOTESTCON

  • AUTOTESTCON '99

  • AUTOTESTCON '98

  • AUTOTESTCON '97

  • AUTOTESTCON '96


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Periodicals related to Corona

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Aerospace and Electronic Systems Magazine, IEEE

The IEEE Aerospace and Electronic Systems Magazine publishes articles concerned with the various aspects of systems for space, air, ocean, or ground environments.


Antennas and Propagation, IEEE Transactions on

Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.


Control Systems Technology, IEEE Transactions on

Serves as a compendium for papers on the technological advances in control engineering and as an archival publication which will bridge the gap between theory and practice. Papers will highlight the latest knowledge, exploratory developments, and practical applications in all aspects of the technology needed to implement control systems from analysis and design through simulation and hardware.


Dielectrics and Electrical Insulation, IEEE Transactions on

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.


Electrical Insulation Magazine, IEEE

The magazine covers theory, analysis, design (computer-aided design), and practical implementation of circuits, and the application of circuit theoretic techniques to systems and to signal processing. Content is written for the spectrum of activities from basic scientific theory to industrial applications.


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Most published Xplore authors for Corona

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Xplore Articles related to Corona

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AC Conductors' Corona-Loss Calculation and Analysis in Corona Cage

IEEE Transactions on Power Delivery, 2012

Corona loss generated from conductors is one of the important design factors of extremely high-voltage ultra-high voltage (EHV/UHV) ac transmission lines. The charge simulation method was adopted to calculate conductor corona loss in the corona cage. Every corona cage wall is equivalent to the ground plane and, therefore, the calculation model is more complicated than the power-line model above the ...


Study of DC corona inception and extinction voltage measurement on electrode surfaces using UV corona monitor

2008 International Conference on Condition Monitoring and Diagnosis, 2008

In order to guide the design and improvement of grading and shielding rings to meet the requirements of UHV projects in China, research on corona characteristics of these components is needed. One of the difficulties is that there is a lack of a proper definition of visible corona. It is common using visual observation, which is easily effected by subjectivity ...


Corona Phenomena of Various High Voltage Shielding Types

2006 International Conference on Power System Technology, 2006

This paper presents the corona phenomena of various high voltage shielding types. The 11 kinds of corona shieldings which were corona steering ring, 7 circular connected half-spheres, topping 2 rings, 4 connected spheres, barrel shape with 5 rings, decagon with 5 rectangles, 2 connected symmetrical rings, drum shape with 2 rings, spherical connected bowls, 3 connected bowls, and 5 connected ...


Experimental investigation of negative DC corona on conductor bundles: A comparison with positive corona

2017 52nd International Universities Power Engineering Conference (UPEC), 2017

Negative DC corona on conductor bundles is experimentally investigated in the coaxial configuration. The dependence of the corona characteristics, namely inception voltage and current, thus also inception field and power losses, on bundle radius and number of conductors in the bundle is assessed. The corona inception voltage of conductor bundles is highest at a bundle radius that corresponds to the ...


Influence of air pressure on positive DC corona inception voltage of stranded conductors in the corona cage

2010 Annual Report Conference on Electrical Insulation and Dielectic Phenomena, 2010

The transmission lines pass by the high altitude region with low air pressure, which brings many special problems to the design and operation of the transmission lines. The corona cage is widely used to study the corona performance of conductors for its good economy and maneuverability. A computation model is adopted for evaluating the corona inception voltages of conductors in ...


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Educational Resources on Corona

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IEEE.tv Videos

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IEEE-USA E-Books

  • AC Conductors' Corona-Loss Calculation and Analysis in Corona Cage

    Corona loss generated from conductors is one of the important design factors of extremely high-voltage ultra-high voltage (EHV/UHV) ac transmission lines. The charge simulation method was adopted to calculate conductor corona loss in the corona cage. Every corona cage wall is equivalent to the ground plane and, therefore, the calculation model is more complicated than the power-line model above the ground surface. Two corona cages-UHV corona cage and small corona cage-were adopted in the tests. The cages are both square sections. Single conductors and bundle conductors were tested in the corona cages to verify the corona cage calculation model. And the same type of conductor was tested in the small corona cage and in the UHV corona cage to check the measuring system and the simulation program of corona loss further. Since the artificial rain rates were from 12 to 20 mm/h, corona losses were measured and calculated. The results indicate that the fundamental frequency component is the most main component of corona loss. The corona cage corona-loss calculation model is appropriate. And for single conductor LGJ-500/35 and bundle conductors, 8 LGJ-500/35, under heavy rain conditions, with the rain rate being from 12 to 20 mm/h, the roughness coefficient range is from 0.4 to 0.5 approximately.

  • Study of DC corona inception and extinction voltage measurement on electrode surfaces using UV corona monitor

    In order to guide the design and improvement of grading and shielding rings to meet the requirements of UHV projects in China, research on corona characteristics of these components is needed. One of the difficulties is that there is a lack of a proper definition of visible corona. It is common using visual observation, which is easily effected by subjectivity and the observation background. In this paper, a new definition of visible corona based on UV Corona Monitor was presented. According to the definition, measurements of the corona inception and extinction voltage on the rob tip in a rob-plate setting under both positive and negative DC voltage were carried out in laboratory. The same measurements on grading rings with different diameters under positive DV voltage were performed in Wuhan High Voltage Research Institute. The results show that the UV Corona Monitor can be used to find out visible corona and obtain the corona inception and extinction voltage.

  • Corona Phenomena of Various High Voltage Shielding Types

    This paper presents the corona phenomena of various high voltage shielding types. The 11 kinds of corona shieldings which were corona steering ring, 7 circular connected half-spheres, topping 2 rings, 4 connected spheres, barrel shape with 5 rings, decagon with 5 rectangles, 2 connected symmetrical rings, drum shape with 2 rings, spherical connected bowls, 3 connected bowls, and 5 connected donuts were designed, constructed and examined. The corona shields made of aluminum were designed for 50 kV rating. In the design process, the electric field distribution and its maximum value of the designed corona shielding were simulated using finite element program. Then the constructed corona shieldings were installed with the high voltage electrode and investigated in the topics of corona inception voltage and partial discharge values at the specified test voltages. The corona shielding characteristic test was carried out at various atmospheres. The tested results are composed of the corona phenomena pictures obtained from the corona camera and elliptical displays showing PD activity and the amplitude of corona discharge taken from the PD detector. The tested results show that the 5 connected donut corona shielding has the best performance. It reduced the corona phenomena of the tested electrode about 20 % after it was installed with the high voltage electrode. The trend of the data tested at 3 various atmospheres are relatively similar. Besides, the results obtained from the simulation program show good agreement with the tested results.

  • Experimental investigation of negative DC corona on conductor bundles: A comparison with positive corona

    Negative DC corona on conductor bundles is experimentally investigated in the coaxial configuration. The dependence of the corona characteristics, namely inception voltage and current, thus also inception field and power losses, on bundle radius and number of conductors in the bundle is assessed. The corona inception voltage of conductor bundles is highest at a bundle radius that corresponds to the minimum electric field strength at the conductor surface. The corona inception field strength of conductor bundles can be considered, with reasonable accuracy, as equal to that of the single conductor. Polarity effects on DC corona characteristics are assessed through comparisons with positive DC corona. For both polarities of applied voltage, the corona current can be accurately estimated through a modified Townsend quadratic formula using appropriate values for ion mobility.

  • Influence of air pressure on positive DC corona inception voltage of stranded conductors in the corona cage

    The transmission lines pass by the high altitude region with low air pressure, which brings many special problems to the design and operation of the transmission lines. The corona cage is widely used to study the corona performance of conductors for its good economy and maneuverability. A computation model is adopted for evaluating the corona inception voltages of conductors in the corona cage, which is established according to the gas discharge theory. The charge simulation method is introduced to the computation model to calculate the electric field intensity. Then the positive corona inception voltage are calculated according to the positive corona criterion. The influence of air pressure on the corona inception voltage of conductors is analysed systematically. Corona inception voltage decreases as air pressure is lowered. The corona inception voltage may decrease by 9% per 0.01MPa bases on the standard atmospheric pressure, which is mainly due to the enlargement of ionization zone as a result of the increase of effective ionization coefficient.

  • AC corona pulses amplitude and frequency related to pressure and humidity

    Compared with DC corona, the physical process of AC corona is more complicated. Through the rod plane electrodes, AC corona characteristics varied with air pressure and humidity were researched in the chamber made of Perspex. The relationships between average amplitude of AC corona pulse and air pressure or humidity, between the frequency of AC corona pulse and air pressure or humidity were studied. The average amplitude of AC corona pulse was inversely proportional to humidity. The amplitude decreased in positive half-cycle and increased in negative half-cycle with the fall of air pressure. What's more, the repetition frequency of AC corona pulses increased with the rise of the humidity. The frequency had little change with the fall of air pressure in the positive half-cycle, while rising in negative half-cycle obviously.

  • High Altitude Effect on Corona Inception Voltages of DC Power Transmission Conductors Based on the Mobile Corona Cage

    In order to investigate the high altitude effect on dc corona inception voltage of power transmission lines, a mobile corona cage test system was constructed. The experiments were carried in Wuhan, Xining, Geermu, and Nachitai, respectively. Photons released as a result of corona discharge on the conductors were detected by the ultraviolet image detector. Both positive and negative corona inception voltages could be acquired by the “tangent method” based on the measured data. The approximate linear altitude correction formulas were suggested.

  • Behavior of the corona current in coaxial systems with negative corona under controlled pressure conditions

    This paper studies the behavior of the corona effect in dry air and coaxial configuration for different pressure values. The study is conducted in a system of four parallel-connected coaxial cylinders placed inside a controlled pressure chamber. During the tests, DC current is measured through the coaxial system for various pressure values when a voltage, higher than the corona onset, is applied; then, a mathematical model that describes the behavior of the corona current as a function of pressure and applied voltage is obtained. The mathematical model accurately reproduces the behavior observed during the measurements.

  • Method of pulse function fitting based on the corona current measurement data

    As an important gas discharge form, corona discharge can generate electromagnetic radiation field which will interfere with the electronic devices and systems. Calculation of electromagnetic radiation field requires quantitative research of corona pulse current and analytical expression. According to the research situation abroad that the corona current was fitted using double-exponential function and Gaussian function, a corona pulse current function is proposed in the paper. It is researched based on the physical processes of corona discharge current excitation. And the fitting parameters and analytic of -60 kV negative corona discharge current are deduced based on the measurement data and compared with the double-exponential fitting result. The result shows that time derivative at zero time of fitting expression corona current pulse function is zero. And the waveform frontier is consistent with the measured waveform, which is better than double-exponential function. The proposed fitting method is suitable for describing the corona discharge pulse current waveform.

  • Development processes of positive and negative DC corona under needle-plate electrode in air

    The characteristics of positive and negative dc corona have been widely studied; however, the development process experienced of dc corona with the voltage is still unclear. This paper carried out dc corona discharge experiments under different dc voltages on the needle-plate model. Results show that positive corona gradually experienced the discharge stages of burst stream, periodic stream, glow and brush in development process; negative corona gradually experienced the Trichel discharge stages of early, middle, zigzag and glow discharge stage. Whatever positive or negative corona, differences exist in pulse amplitude, repetition rate and time interval. The results provide experimental and theoretical basis to set up and improve corona discharge detection technology.



Standards related to Corona

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IEEE Guide for Making Corona (Partial Discharge) Measurements on Electronics Transformers

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.


IEEE Guide for Partial Discharge Measurement in Power Switchgear

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.


IEEE Standard Definitions of Terms Relating to Corona and Field Effects of Overhead Power Lines

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 ...


IEEE Standard for Safety Levels With Respect to Human Exposure to Electromagnetic Fields, 0-3 kHz

Develop safety levels for human exposure to electromagnetic fields from 0 to 3kHz. This standard will be based on the results of an evaluation of the relevant scientific literature and proven effects which are well established and for which thresholds of reaction are understood. Field limits will be derived from threshold current densities or internal electric fields.


Standard Requirements, Terminology, and Test Code for Bushings for DC Applications Rated 110 kV BIL and Above

This standard applies to outdoor and indoor power apparatus dc bushings of condenser type that have basic impulse insulation levels of 110 kV and above for use as components of oil-filled converter transformers and smoothing reactors, as well as air-to-air dc bushings. This standard does not apply to the following: a) High-voltage cable terminations (potheads) b) Bushings for instrument transformers ...



Jobs related to Corona

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