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