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The 7th International Conference on Applied Electrostatics(第七届国际静电学术会议)

作者： X G Yue Z H He J Ma H Zhao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhanChina

Along with a growing concern on indoor air quality,it becomes more and more important to take a control and treat on indoor air pollutants,such as formaldehyde,total volatile organic compounds TVOCs,microbial,and particulate *** this end,our innovative group used corona discharge plasma together with photo-catalytic to treat *** modified photo catalysts were loaded on the electrode surface,and thus treating formaldehyde in an artificial enclosed *** explore the relative purification factors of plasma cooperated with photo-catalytic and their relationships,the catalyst quantity,inlet rate,temperature,humidity and other process variables were changed during experiments.

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Note: Measurement of the runaway electrons in the J-TEXT tokamak

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Review of Scientific Instruments 2012年第5期83卷 056108页

作者： Chen, Z.Y. Zhang, Y. Zhang, X.Q. Luo, Y.H. Jin, W. Li, J.C. Chen, Z.P. Wang, Z.J. Yang, Z.J. Zhuang, G. State Key Laboratory of Advanced Electromagnetic Engineering and Technology College of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

The runaway electrons have been measured by hard x-ray detectors and soft x-ray array in the J-TEXT tokamak. The hard x-ray radiations in the energy ranges of 0.5-5 MeV are measured by two NaI detectors. The flux of lost runaway electrons can be obtained routinely. The soft x-ray array diagnostics are used to monitor the runaway beam generated in disruptions since the soft x-ray is dominated by the interaction between runaway electrons and metallic impurities inside the plasma. With the aid of soft x-ray array, runaway electron beam has been detected directly during the formation of runaway current plateau following the disruptions. © 2012 American Institute of Physics.

关键词： Tokamak devices

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Harmonic compensation characteristics of active power filters to nonlinear loads based on impedance analysis

Harmonic compensation characteristics of active power filter...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Ke Dai Cong Liu Kewei Duan Yong Kang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781467301596

In this paper, the harmonic compensation characteristics of APFs to nonlinear loads are investigated by a circuit equivalent method based on impedance analysis. It is found that the ac-side harmonic current of voltage source type nonlinear load (VSNL) will be amplified seriously when it is compensated by shunt APF, and the ac-side harmonic voltage of current source type nonlinear load (CSNL) will be amplified when compensated by series APF. The harmonic amplification effect is the main factor to restrict the application of APFs to different kind of nonlinear loads in all circumstance. Methods to diminish the harmonic amplification effects based on altering load's equivalent impedance are derived. Due to the duality property of shunt APF and series APF, simulation and experiment are carried out only for shunt APF harmonic compensating system, and the results verify the correctness of the analysis and validity of the propose method.

关键词： Harmonic analysis Impedance Power harmonic filters Active filters Shunt (electrical) Rectifiers

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Sinusoidal back-EMF of vernier Permanent Magnet machines

Sinusoidal back-EMF of vernier Permanent Magnet machines

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Dawei Li Ronghai Qu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Sinusoidal back-EMF waveform of vernier Permanent Magnet (PM) machines is analyzed in this paper. An analytical expression of Electromotive Force (EMF) of electric machines including vernier machines is developed to analyze EMF harmonics, and the effect of vernier PM machine pole ratio, the ratio of number of rotor poles to stator poles, on the EMF waveform. Moreover, this paper represents several Finite Element Analysis (FEA) models to verify the analysis based on the proposed expression, and the effect of tooth width ratio, which is the ratio of tooth width to tooth pitch, on back-EMF of vernier PM machines, and optimal tooth width ratio is obtained and verified by FEA. Finally, this paper makes comparisons between EMF waveform of vernier PM machines and that of traditional PM machines from the point of view of analytical EMF expression.

关键词： Lead Power capacitors Stators IP networks Harmonic analysis

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Non ideal effect of current transformer and its influence on controller design of cascade multilevel STATCOM

Non ideal effect of current transformer and its influence on...

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IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

作者： Yanjun Shi Bangyin Liu Shanxu Duan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

This paper discusses influences of using current transformer (CT) as feedback element in a cascade multilevel converter. First, a simplified transfer function model of CT is built by small signal test and the model parameter is verified by large signal experiment. Then, a cascade multilevel STATCOM with CT feedback is modeled and analyzed. Influences of CT on controller designing are discussed, along with solutions. Finally, experiments are performed to verify proposed method.

关键词： Current transformers Automatic voltage control Computed tomography Transfer functions Delay Power electronics Distributed power generation

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IDENTIFIYING THREE KINDS OF DIELECTRIC BARRIER DISCHARGES WITH FAST FOURIER TRANSFORM TECHNIQUES

IDENTIFIYING THREE KINDS OF DIELECTRIC BARRIER DISCHARGES WI...

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The ⅪⅩ International Conference on Gas Discharges and Their Applications

作者： YUNFEI WU QIZHENG YE State Key Laboratory of Advanced Electromagnetic Engineering and Technology College of Electrical and Electronic EngineeringHuazhong University of Science and Technology

We propose a method—the Fourier energy spectrum to identify filamentary,periodic and homogeneous dielectric barrier discharges (DBDs) based on fast Fourier transform techniques(FFT) of the discharge *** radial Fourier energy spectrum(RFES) shows only one peak and the angular Fourier energy spectrum(AFES) shows a serious of random peaks in a filamentary *** RFES and AFES show a serious of periodic peaks in a periodic *** addition to a direct current component,there is no peak for the RFES and AFES in a homogeneous *** an increase of the applied voltage,the RFES gradually shifts right and the AFES gradually shifts up in air at atmospheric pressure with a mesh electrode,it means that the spatial period of the discharge image gradually decreases,and the periodic characteristic of the discharge is more *** results indicate that the method is simple and effective to identify the three different kinds of DBDs.

关键词： DBDs FFT the radial Fourier energy spectrum(RFES) the angular Fourier energy spectrum(AFES) identify

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Experimental Study on Arc Duration under External Transverse Magnetic Fields in a DC 580V Circuit

Experimental Study on Arc Duration under External Transverse...

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The 26th International Conference on Electrical contacts and the 4th International Conference on Reliability of Electrical Products & Electrical Contacts

作者： Liu Yun Li Zhenbiao Wang Ke Wang Ronghua State Key Laboratory of Advanced Electromagnetic Engineering and Technology College of Electrical and Electronic Engineering Huazhong University of science and technology

ISBN: (纸本)9781622763139

Using transverse magnetic field(TMF) is one of the most important ways to improve the electric life and the breaking capacity of DC *** order to better understand the influence of transverse magnetic field on arc duration,a series of experiments were conducted under external transverse magnetic field with 4 relay contacts in a DC 580V/60A *** permanent magnets,the transverse magnetic field is obtained and the magnetic flux density at center magnet can be varied from 80 to 320 *** results show that the making arc duration is independent of magnetic flux density,but the breaking arc duration is decreased monotonically with the increase of the magnetic flux *** addition,the gradient |Δt/ΔB| of the breaking arc duration is decreased with the increase of the magnetic flux density,which means the curve of t-B tends to be flat.

关键词： transverse magnetic field(TMF) arc duration relay contact

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Phase current differential protection for transformers in wye-delta mode

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Telkomnika 2012年第6期10卷 1280-1286页

作者： Wang, Yuxue Yin, Xianggen Zhang, Zhe Li, Zhenxing The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

For the current transformers (CTs) on the delta side measure the line current instead of the phase current, line current differential protection is adopted in transformers connected in wye-delta mode currently. However, the symmetry feature of inrush current in line current differential protection may invalidate the inrush current restrained criterion. A calculating method of current through delta windings according the measured current from CT is proposed in this paper. Using this calculated current, phase current differential protection can be realized. Based on the method an adaptive second harmonic restrained scheme for magnetizing inrush current is presented. The scheme not only adaptively adjusts the secondary harmonic ratio of restrained current but also guarantees the fast action when transformers with internal faults are no-load energized. Consequently the performance of transformer differential protection is greatly improved. Simulation results in Matlab/Simulink validate the proposed method. © 2012 Universitas Ahmad Dahlan.

关键词： Transformer protection

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Inactivate adenovirus by using a room temperature plasma needle

Inactivate adenovirus by using a room temperature plasma nee...

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IEEE International Conference on Plasma Science (ICOPS)

作者： Z. Xiong X. Lu State key laboratory of advanced electromagnetic engineering and technology Huazhong University of Science and Technology Wuhan Hubei China

Summary form only given. A very large number of serious human and animal diseases such as AIDS, SARS, common cold, human and avian influenza, chickenpox, and several others are caused by viral infections. The infectious agents of these diseases are virus nanoparticles (virions) that contain DNA/RNA strands encased in a capsid protein coat and in some cases also in an outer lipid envelope. The virions are usually transmitted from the infected cases through airborne dissemination or diffusion during nosocomial transfusion of blood or body liquids. The onset of the viral infection is usually heralded by the entry of the virion's genetic material into the intracellular space followed by the uncontrollable integration with the host DNA and virus replication. Despite decades of research, virion detection, pre-emptive and post-infection anti-viral treatments and immunotherapies remain ineffective and the morbidity and mortality rates due to the associated infections remain high.

关键词： Plasmas Humans Adenoviruses Needles Diseases DNA Proteins

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Atmospheric plasma brush driven by sub-microsecond voltage pulses

Atmospheric plasma brush driven by sub-microsecond voltage p...

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IEEE International Conference on Plasma Science (ICOPS)

作者： S. Wu X. Lu State key laboratory of advanced electromagnetic engineering and technology Huazhong University of Science and Technology Wuhan Hubei China

Plasma jet devices generate plasmas in an open space (surrounding air) rather than in lieu of confined discharge gaps. Hence, they can be used for direct treatment and there is also no limitation on the size of the object. However, to the best of our knowledge, the dimensions of plasma jet nozzles that have been reported in the literature are mainly very small (sub-millimeter to several millimeters) making treatment of a large area difficult, only few large plasma jets are developed. One way to overcome this shortcoming is the use of plasma jet arrays. However, since individual plasma plumes generated by these plasma jet arrays are independent and not merged, it is relatively difficult to achieve uniform treatment effects.

关键词： Brushes Surface treatment Plasma sources Laboratories electromagnetics Educational institutions

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