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Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Hua Li Zhiwei Li Fuchang Lin Yaohong Chen De Liu Bowen Wang Haoyuan Li Qin Zhang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology HUST Wuhan P. R. China

Metalized polypropylene film capacitors (MPPFCs) can work under high electric fields due to the self-healing characteristic. Leakage phenomenon caused by the insulation resistance (IR) in MPPFCs is one of the important factors resulting in the reduction of the energy efficiency. The IR is directly related to the DC electric conduction mechanism in polypropylene film. This paper mainly concentrates on the IR by investigating the electrical conduction mechanism of metalized films under high electric fields. Firstly the conduction mechanism of metallized films is discussed. Secondly IR is obtained under different electric fields based on an established measurement platform The Poole-Frenkel(PF) model presented in this paper includes the field-enhanced carrier density caused by the barrier height attenuation in directions both opposite and forward to the electric field, and the field-enhanced carrier mobility. The equation for electric conductivity based on this model gives not only the usual Ohm's law at low fields but also at extremely high electric fields. And the IR calculations match well with the experimental results.

关键词： Electric fields Conductivity Films Capacitors Resistance Current measurement

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Short circuit analysis for integration of 10MW Windfarm in Nigeria at the PCC

Short circuit analysis for integration of 10MW Windfarm in N...

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IEEE General Meeting Power& Energy Society

作者： Owolabi Sunday Adio Xiangning Lin Feng Zhao Zhiqian Bo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Smart Grid Institute State Grid Beijing CHINA

A short circuit in a power system can cause very high currents to flow to the fault location. The magnitude of the short circuit current depends on the impedance of system under short circuit conditions. However, to study the effect of windfarm integrated into Power Holding Company of Nigeria (PHCN) which is power bureau of the country, a short circuit calculation was performed studies conducted. The analysis was carried out in two stages, one was using Thevenin equivalent to roughly check unbalance short current from PHCN external source from Kaduna substation at 132/33kV, although this was actually not part of the current studies. The second part was to performed short circuit analysis at network where the windfarm will be connected through 33/11kV level (PCC), which is for this current studies by using computer software tool (DigSILENT powerfactory). This was done to verify the withstands of capacity for the main substation equipment and the new OHLs in comparison with the 3-phase and 1-phase to ground short circuit calculated values of grid studies for the windfarm project. In the network calculation, consideration was made for both maximum and minimum short circuit conditions and it is performed according the IEC 60909 (2001) standards. However, the aim of the analysis was the assessment of the electrical parameters of the WindFarm during and after a three phase short circuit event at the 33 kV Kastina substation because this is the point where the windfarm have to be connected and also the location of the wind generators.

关键词： Software Substations Gold

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β decay of Cd129 and excited states in In129

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Physical Review C 2015年第5期91卷 054324-054324页

作者： J. Taprogge A. Jungclaus H. Grawe S. Nishimura P. Doornenbal G. Lorusso G. S. Simpson P.-A. Söderström T. Sumikama Z. Y. Xu H. Baba F. Browne N. Fukuda R. Gernhäuser G. Gey N. Inabe T. Isobe H. S. Jung D. Kameda G. D. Kim Y.-K. Kim I. Kojouharov T. Kubo N. Kurz Y. K. Kwon Z. Li H. Sakurai H. Schaffner K. Steiger H. Suzuki H. Takeda Zs. Vajta H. Watanabe J. Wu A. Yagi K. Yoshinaga G. Benzoni S. Bönig K. Y. Chae L. Coraggio A. Covello J.-M. Daugas F. Drouet A. Gadea A. Gargano S. Ilieva F. G. Kondev T. Kröll G. J. Lane A. Montaner-Pizá K. Moschner D. Mücher F. Naqvi M. Niikura H. Nishibata A. Odahara R. Orlandi Z. Patel Zs. Podolyák A. Wendt Instituto de Estructura de la Materia CSIC E-28006 Madrid Spain Departamento de Física Teórica Universidad Autónoma de Madrid E-28049 Madrid Spain RIKEN Nishina Center RIKEN 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan GSI Helmholtzzentrum für Schwerionenforschung GmbH 64291 Darmstadt Germany National Physical Laboratory NPL Teddington Middlesex TW11 0LW United Kingdom Department of Physics University of Surrey Guildford GU2 7XH United Kingdom LPSC Université Joseph Fourier Grenoble 1 CNRS/IN2P3 Institut National Polytechnique de Grenoble F-38026 Grenoble Cedex France Department of Physics Tohoku University Aoba Sendai Miyagi 980-8578 Japan Department of Physics University of Tokyo Hongo 7-3-1 Bunkyo-ku 113-0033 Tokyo Japan School of Computing Engineering and Mathematics University of Brighton Brighton BN2 4JG United Kingdom Physik Department E12 Technische Universität München D-85748 Garching Germany Institut Laue-Langevin B.P. 156 F-38042 Grenoble Cedex 9 France Department of Physics Chung-Ang University Seoul 156-756 Republic of Korea Rare Isotope Science Project Institute for Basic Science Daejeon 305-811 Republic of Korea Department of Nuclear Engineering Hanyang University Seoul 133-791 Republic of Korea School of Physics and State key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China MTA Atomki P.O. Box 51 Debrecen H-4001 Hungary Department of Physics Osaka University Machikaneyama-machi 1-1 Osaka 560-0043 Toyonaka Japan Department of Physics Faculty of Science and Technology Tokyo University of Science 2641 Yamazaki Noda Chiba Japan INFN Sezione di Milano via Celoria 16 I-20133 Milano Italy Institut für Kernphysik Technische Universität Darmstadt D-64289 Darmstadt Germany Department of Physics Sungkyunkwan University Suwon 440-746 Republic of Korea Istituto Nazionale di Fisica Nucleare Complesso Universitario di Monte S. Angelo I-80126 Napoli Italy Dipartimento di Fisica Università di Napo

The β decay of Cd129, produced in the relativistic fission of a U238 beam, was experimentally studied at the RIBF facility at the RIKEN Nishina Center. From the γ radiation emitted after the β decays, a level scheme of In129 was established comprising 31 excited states and 69 γ-ray transitions. The experimentally determined level energies are compared to state-of-the-art shell-model calculations. The half-lives of the two β-decaying states in Cd129 were deduced and the β feeding to excited states in In129 were analyzed. It is found that, as in most cases in the Z<50, N≤82 region, both decays are dominated by the ν0g7/2→π0g9/2 Gamow–Teller transition, although the contribution of first-forbidden transitions cannot be neglected.

关键词： CADMIUM isotopes INDIUM isotopes PARTICLE decays EXCITED states NUCLEAR fusion

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The application of Bayesian network theory in transformer condition assessment

The application of Bayesian network theory in transformer co...

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IEEE PES Asia-Pacific Power and Energy engineering Conference (APPEEC)

作者： Jiangtao Quan Ling Ruan Zhicheng Xie Xingdong Li Xiangning Lin The State Grid Key Laboratory of On-site Test Technology Hubei Electric Power Test & Research Institute Wuhan China The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

In order to assess transformer's status and forecast its potential fault, this paper applied Bayesian network classifier into transformer fault diagnosis, combined with dissolved gas analysis and other electrical test results, and thereby created a transformer fault synthetic diagnosis method. Build up transformer's fault diagnosis model based on Naive Bayesian Classifier and Tree Augmented Naive Bayesian Classifier respectively, and verify their validity by instance.

关键词： Oil insulation Power transformer insulation Bayes methods Circuit faults Fault diagnosis Grounding

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Room temperature direct current air plasma jet for biomedical applications

Room temperature direct current air plasma jet for biomedica...

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IEEE International Conference on Plasma Science (ICOPS)

作者： S. Wu Z. Wang Q. Huang X. Lu K. Ostrikov State key laboratory of advanced electromagnetic engineering and technology Huazhong University of Science and Technology Wuhan Hubei China Huazhong University of Science and Technology Wuhan Hubei CN

Summary form only given. Atmospheric-pressure room-temperature plasma jets are commonly used in plasma medicine, nanotechnology, as well as surface and materials processing. Most of the applications require room-temperature operation while completely avoiding the glow-to-arc transitions. To meet these requirements, the atmospheric plasma jets are usually sustained in noble gases. However, this is very challenging for the open-air operation. Moreover, the cross-sections of the plasma plumes are typically very small, which make large-area surface processing particularly difficult. One promising way to overcome this shortcoming is by using the plasma jet arrays. However, since the individual plasma plumes generated by the arrayed plasma jets are in most cases independent and do not merge in open air, it is very difficult to achieve uniform plasmas and surface treatment effects. In this paper, we demonstrate a homogenous cold air plasma glow with a large cross-section generated by a direct current power supply. There is no risk of glow-to-arc transitions, and the plasma glow appears uniform regardless of the gap between the nozzle and the surface being processed. Detailed studies show that both the position of the quartz tube and the gas flow rate affect the plasma characteristics. Further investigation indicates that the residual charges trapped on the inner surface of the quartz tube may be responsible for the generation of the air plasma plume with a large cross-section. Moreover, the spatially resolved optical emission spectroscopy reveals that the air plasma plume is uniform as it propagates out of the nozzle. The air plasma plume with remarkable improvement of the plasma uniformity is used to improve the bio-compatibility of a glass coverslip over a reasonably large area. This improvement is demonstrated by a much more uniform and effective attachment and proliferation of human embryonic kidney 293 (HEK 293) cells on the plasma-treated surface.

关键词： Surface treatment Educational institutions Australia Electron tubes Plasma temperature Laboratories

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Analysis of d- and q-axis inductances and saliency ratios in interior permanent magnet machines with fractional-slot concentrated- windings considering harmonic effects

Analysis of d- and q-axis inductances and saliency ratios in...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Xiaolong Zhang Ronghai Qu Hong Chen Jian Luo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China UCAS EV Co. Ltd Shanghai China

The interior permanent magnet (IPM) machine with fractional-slot concentrated-windings (FSCW) has become a popular research topic owing to their novel structures and attracting potentials. This paper is focused on inductances and saliency ratios in IPM FSCW machines with different pole and slot combinations. Analytical expressions of inductances and saliency ratios are derived using harmonic analysis method (HAM) and their features and trends are concluded. The concept of dq-axis equivalent windings containing harmonic components is proposed to help better understand these features and trends. It explains the phenomenon that configurations with fewer stator slots and fewer winding layers have lower saliency ratio. Theoretical conclusions are verified by finite-element (FE) method.

关键词： Windings Harmonic analysis Inductance Power capacitors Rotors Atmospheric modeling Stator windings

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Magnetic order in the pyrochlore iridate Nd2Ir2O7 probed by muon spin relaxation

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Physical Review B 2013年第6期88卷 060411(R)-060411(R)页

作者： Hanjie Guo Kazuyuki Matsuhira Ikuto Kawasaki Makoto Wakeshima Yukio Hinatsu Isao Watanabe Zhu-an Xu Department of Physics and State Key Laboratory of Silicon Materials Zhejiang University Hangzhou 310027 China Advanced Meson Science Laboratory RIKEN 2-1 Hirosawa Wako Saitama 351-0198 Japan Faculty of Engineering Kyushu Institute of Technology KitaKyushu 804-8550 Japan Division of Chemistry Graduate School of Science Hokkaido University Sapporo 060-0810 Japan

Muon spin relaxation results on the pyrochlore iridate Nd2Ir2O7 are reported. Spontaneous coherent muon spin precession below the metal-insulator transition (MIT) temperature of about 33 K is observed, indicating the appearance of a long-range magnetic ordering of Ir4+ moments. With further decrease in temperature, the internal field at the muon site increases again below about 9 K. The second increase of internal field suggests the ordering of Nd3+ moments, which is consistent with a previous neutron experiment. Our results suggest that the MIT and magnetic ordering of Ir4+ moments have a close relationship and that the large spin-orbit coupling of Ir 5d electrons plays a key role for both MIT and the mechanism of the magnetic ordering in pyrochlore iridates in the insulting ground state.

关键词： NEODYMIUM compounds MUONS PYROCHLORE MAGNETIC structure METAL-insulator transitions MAGNETIC moments

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Erratum: “Design and test of a flat-top magnetic field system driven by capacitor banks” [Rev. Sci. Instrum. 85, 045106 (2014)]

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Review of Scientific Instruments 2014年第4期85卷

作者： Fan Jiang Tao Peng Houxiu Xiao Jianlong Zhao Yuan Pan Fritz Herlach Liang Li 1Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan China 2State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China 3Katholieke Universiteit Leuven Celestijnenlaan 200D B-3001 Leuven Belgium

The original paper1 was published online on 7 April 2014, and the information of corresponding author and the electronic mail of corresponding author were misse

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Numerical modeling the interaction between externally applied resonant magnetic perturbations and tearing instabilities

Numerical modeling the interaction between externally applie...

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第十六届全国等离子体科学技术会议暨第一届全国等离子体医学研讨会

作者： Qiming Hu Q.Yu Bo Rao Ge Zhuang Yonghua Ding Wei Jin Nengchao wang Xiwei Hu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Max-Planck-Institut für Plasmaphysik EURATOM association85748 GarchingGermany

To compare with resonant magnetic perturbations(RMPs) related experimental results observed in J-TEXT tokamak,nonlinear numerical modeling based on reduced MHD equations has been carried *** experimental parameters as input,both the mode locking and mode stabilization by RMPs are also obtained from numerical modeling. Further calculations have been carried out to study the plasma parameters affecting the mode stabilization by RMPs,including the plasma rotation frequency,viscosity,Alfven velocity and the RMP *** is found that the suppression of the tearing mode by RMPs of moderate amplitude is possible for a sufficiently high ratio of plasma rotation velocity to the Alfven speed.A larger plasma viscosity enhances the mode stabilization. In addition,the non-uniform mode rotation frequency,modulated by electromagnetic force(Fern) and viscous force(Fvs),results in the applied RMPs contributing both net stabilizing and braking effect on *** evaluation based on analytical theory shows the applied RMP contributes a dominant stabilizing effect,which are responsible for the suppression of *** dynamics of the first discovered small locked island(SLI) are *** is found that the island is locked at the stabilizing phase and the saturated island width is less than the linear layer *** simulated Mirnov signal indicates the small locked island is likely to be the complete suppression case observed in experiments. The comparisons between the numerical and experimental results are in good agreement.

关键词： Numerical modeling the interaction between externally applied resonant magnetic perturbations and tearing instabilities

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Cooperation mechanism of wide-area protection system based on multi-agents

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Telkomnika - Indonesian Journal of Electrical engineering 2013年第1期11卷 195-202页

作者： Zhang, Mingzhu Li, Zhenxing School of Mathematics and Statistics Xuchang University Henan Province China The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

With the rapid growth of power system, it is becoming increasingly difficult to realize reach and time coordination for conventional backup protection. To cope with those problems, wide-area protection is widely researched. In this paper, a novel dynamic cooperation mechanism of wide-areaprotection is proposed, which can operate better than distributed and centralized systems with respect to reliability, section selectivity, and so on. The multi-agents technology is used to enhance adaptability and decrease communication traffic of wide-area protection system. The improvement of backup protection performance to overcome some specific conditions, such as communication bit error, protection failure, and breaker failure, is also illustrated by utilizing communication networks and distributed protection agents which enables an easy and flexible construction and operation of the proposed wide-area protection system. The example analysis on IEEE 5 nodes system shows the concrete cooperation processing among agents in the cases of typical faults. © 2013 Universitas Ahmad Dahlan.

关键词： Multi agent systems

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