• Complex
  • Title
  • Author
  • Keyword
  • Abstract
  • Scholars
Search
High Impact Results & Cited Count Trend for Year Keyword Cloud and Partner Relationship

Query:

学者姓名:李兴文

Refining:

Source

Submit Unfold

Co-Author

Submit Unfold

Language

Submit

Clean All

Export Sort by:
Default
  • Default
  • Title
  • Year
  • WOS Cited Count
  • Impact factor
  • Ascending
  • Descending
< Page ,Total 14 >
Chemical kinetics analysis of two C5-perfluorinated ketone (C5 PFK) thermal decomposition products: C4F7O and C3F4O EI SCIE Scopus
期刊论文 | 2018 , 51 (43) | JOURNAL OF PHYSICS D-APPLIED PHYSICS
Abstract&Keyword Cite

Abstract :

SF6 has been designated as a greenhouse gas by the Kyoto Protocol because of its high global warming potential. C5-perfluorinated ketone (C5F10O or C5-PFK) has excellent insulation properties and environmental characteristics. and has been chosen as an alternative gas to SF6. Calculation of thermal decomposition is usually based on local thermodynamic equilibrium (LTE) and local chemical equilibrium assumptions. However, the composition may not reach chemical equilibrium, particularly at lower temperatures and high rates of temperature increase. In order to compare the chemical non-equilibrium and local thermodynamic equilibrium compositions, a chemical kinetic model is used to calculate time evolution of composition; this considers the effects of the energy barrier in chemical reactions. To obtain the required data for the model, which is necessary because of the limited research on reaction rates in C5-PFK decomposition, the methods of computational chemistry are used to calculate transition states and reaction rates. The LTE composition is calculated using Gibbs free energy minimization. Calculations are presented for two possible C5-PFK thermal decomposition products, C4F7O and C3F4O. The result indicates that chemical kinetics is required to calculate the dissociation of C5-PFK at low temperatures, such as occur during arc ignition and near the arc boundary.

Keyword :

C5-PFK arc chemical kinetics SF6 alternatives thermal decomposition

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Chen, Li , Li, Xingwen , Xiong, Jiayu et al. Chemical kinetics analysis of two C5-perfluorinated ketone (C5 PFK) thermal decomposition products: C4F7O and C3F4O [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2018 , 51 (43) .
MLA Chen, Li et al. "Chemical kinetics analysis of two C5-perfluorinated ketone (C5 PFK) thermal decomposition products: C4F7O and C3F4O" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 51 . 43 (2018) .
APA Chen, Li , Li, Xingwen , Xiong, Jiayu , Murphy, Anthony B. , Fu, Mingli , Zhuo, Ran . Chemical kinetics analysis of two C5-perfluorinated ketone (C5 PFK) thermal decomposition products: C4F7O and C3F4O . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2018 , 51 (43) .
Export to NoteExpress RIS BibTex
Imaging of Discharge Plasma Channel Evolution Process of Microsecond Wire Explosion in Air EI SCIE Scopus
期刊论文 | 2018 , 46 (10) , 3473-3477 | IEEE TRANSACTIONS ON PLASMA SCIENCE
Abstract&Keyword Cite

Abstract :

The discharge plasma channel (DPC) evolution process is observed by taking time-series self-emission intensified charge-coupled device (iCCD) photos and simultaneous shadow images. By adding neutral density filters before iCCD, the subtle structure of the DPC self-emission is observed. It is interesting that a treelike structure is observed soon after the voltage breakdown. Long exposure time photos demonstrate that this structure existed for hundreds of nanoseconds. An inner homogeneously luminous column arises latterly, forming a two-layer self-emission structure. Then, this column gradually occupies the whole DPC. Shadow images show that the expanding DPC maintains good axial uniformity, manifesting the long-standing uneven treelike structure only has limited impact on the energy distribution and the expansion process. The calculated expansion rate reaches its maximum value (4.75 km/s) not at the power peak, but 0.24 mu s after that. Then, the expansion rate undergoes fast drop and slow decline. In addition, it seems that the distributions of related plasma parameters experience an evolution from nonuniform to uniform.

Keyword :

shadow images Explosion of wire (EEW) self-emission

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Yin, Guofeng , Li, Xingwen , Wu, Jian et al. Imaging of Discharge Plasma Channel Evolution Process of Microsecond Wire Explosion in Air [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2018 , 46 (10) : 3473-3477 .
MLA Yin, Guofeng et al. "Imaging of Discharge Plasma Channel Evolution Process of Microsecond Wire Explosion in Air" . | IEEE TRANSACTIONS ON PLASMA SCIENCE 46 . 10 (2018) : 3473-3477 .
APA Yin, Guofeng , Li, Xingwen , Wu, Jian , Shi, Huantong , Zhong, Wei , Huang, Qinghua . Imaging of Discharge Plasma Channel Evolution Process of Microsecond Wire Explosion in Air . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2018 , 46 (10) , 3473-3477 .
Export to NoteExpress RIS BibTex
The effect of the length to diameter ratio on capillary discharge plasmas EI Scopus SCIE
期刊论文 | 2018 , 25 (10) | Physics of Plasmas
Abstract&Keyword Cite

Abstract :

The capillary geometry of discharge plasma sources determines the performance of capillary plasma generators. In this research, 16 types of generators with different geometric sizes and aspect ratios (the length divided by the diameter of the capillary, ranging from 0.67 to 22) were designed. Plasma parameters, including the temperature, static pressure, and velocity, were calculated and analyzed. The results show that the maximum temperature of the plasma decreased with increasing capillary aspect ratios. However, there was a difference between the temperature distributions above and below an aspect ratio threshold of 8.67. The simulations suggest that the aspect ratio threshold of the static pressure for generating shock waves is 15.33. For aspect ratios lower than this value, the maximum static pressure increased with increases in the aspect ratio. Otherwise, a shock wave would be generated, and the distribution of the static pressure would be consistent with distribution 2 (with a shock wave near the nozzle). The maximum velocity decreased as the capillary aspect ratios increased, with a threshold of 8.67. Since the plasma parameters were exponential functions of the aspect ratios, distribution and variation trends of the plasma parameters for different aspect ratios are proposed. These can be used to adjust the electrothermal plasma parameters and to design plasma generators. © 2018 Author(s).

Keyword :

Capillary discharge plasmas Capillary geometry Capillary plasma Discharge plasma Electrothermal plasma Length to diameter ratio Maximum temperature Maximum velocity

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Zhang, Jiangbo , Li, Xingwen , Yang, Weihong et al. The effect of the length to diameter ratio on capillary discharge plasmas [J]. | Physics of Plasmas , 2018 , 25 (10) .
MLA Zhang, Jiangbo et al. "The effect of the length to diameter ratio on capillary discharge plasmas" . | Physics of Plasmas 25 . 10 (2018) .
APA Zhang, Jiangbo , Li, Xingwen , Yang, Weihong , Yan, Wenrong , Wei, Ding , Liu, Yi et al. The effect of the length to diameter ratio on capillary discharge plasmas . | Physics of Plasmas , 2018 , 25 (10) .
Export to NoteExpress RIS BibTex
Experimental Study on Contact Behavior of Tilted Contact in Air Circuit Breaker EI SCIE Scopus
期刊论文 | 2018 , 8 (3) , 343-349 | IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
Abstract&Keyword Cite

Abstract :

Short-time withstanding current is a key parameter of air circuit breakers. Due to the structure of multiple parallel contacts, the outer movable conductors tilt and slide seriously when withstanding the large short-circuit current. This paper is aimed to investigate the contact behavior of the tilted contact. A new designed experimental setup to measure the minimum repulsion current and the contact resistance of the tilted contact is developed. Contact force and tilt angle can also be measured and adjusted. Based on the measured results and the impression marks of the tilted contact, it is concluded that the repulsion force and the contact resistance are increased seriously when the contact is tilted. During the contact tilting process, the contact type is changed from the line contact to the point contact and the contact center is offset to the edge of the movable contact. In addition, with the help of contact bridge model, it is also found that the contact type transition plays a dominant role on the increase of the repulsion force and contact resistance.

Keyword :

contact resistance minimum repulsion current short-time withstand current electric contact contact behavior Air circuit breaker (ACB) contact tilt

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Li, Xingwen , Wang, Yunfeng , Wang, Qian et al. Experimental Study on Contact Behavior of Tilted Contact in Air Circuit Breaker [J]. | IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY , 2018 , 8 (3) : 343-349 .
MLA Li, Xingwen et al. "Experimental Study on Contact Behavior of Tilted Contact in Air Circuit Breaker" . | IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY 8 . 3 (2018) : 343-349 .
APA Li, Xingwen , Wang, Yunfeng , Wang, Qian , Qu, Jianyu , Liu, Hongwu . Experimental Study on Contact Behavior of Tilted Contact in Air Circuit Breaker . | IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY , 2018 , 8 (3) , 343-349 .
Export to NoteExpress RIS BibTex
Effect of humidity on dielectric breakdown properties of air considering ion kinetics EI SCIE Scopus
期刊论文 | 2018 , 51 (37) | JOURNAL OF PHYSICS D-APPLIED PHYSICS
Abstract&Keyword Cite

Abstract :

This paper investigates the dielectric breakdown properties of humid air, taking into account ion kinetics. Initially, an overall kinetic scheme that includes all the main reactions likely to happen in humid air is established for the first time. Then, the calculation method of dielectric properties is improved, based on more comprehensive avalanche model considering both spatial growth and temporal processes. Better consistency between present results and experimental values confirms the validity of the improved method and kinetic schemes. Finally, the effective ionization Townsend coefficients a alpha(eff) in humid air at different humidity and gas pressures are calculated and analyzed considering ion kinetics. Reduced critical electric field strength (EIN)(cr) can be determined when a alpha(eff) = 0. The results show that (EIN)(cr) in humid air increases sharply in the beginning and then tends to be constant with the humidity rises. Besides, the mechanism of humidity's effect on dielectric breakdown properties is well explained: at relatively low EIN, alpha(eff) decreases with the increase of humidity mainly due to more frequent three-body conversions, while at higher EIN, the main reason is the increased number of attachment reactions.

Keyword :

dielectric breakdown ion kinetics avalanche model

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Li, Bingxu , Li, Xingwen , Fu, Mingli et al. Effect of humidity on dielectric breakdown properties of air considering ion kinetics [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2018 , 51 (37) .
MLA Li, Bingxu et al. "Effect of humidity on dielectric breakdown properties of air considering ion kinetics" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 51 . 37 (2018) .
APA Li, Bingxu , Li, Xingwen , Fu, Mingli , Zhuo, Ran , Wang, Dibo . Effect of humidity on dielectric breakdown properties of air considering ion kinetics . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2018 , 51 (37) .
Export to NoteExpress RIS BibTex
Experimental Study and Feature Improvement of DC Series Arc Faults with Switching Noise Interference CPCI-S
会议论文 | 2018 , 135-142 | Joint Meeting of the 29th International Conference on Electrical Contacts (ICEC) / 64th IEEE Holm Conference on Electrical Contacts
Abstract&Keyword Cite

Abstract :

DC microgrids have the higher efficiency, higher flexibility, and lower cost than ac networks due to the fewer conversion stages. However, the protection of dc microgrids is still challenging because the limited ac protection technologies could be directly migrated to the dc system. For the sake of the human and equipment safety, the arc fault protection technology is one of urgently concerned aspects. In dc microgrids, arc electrical characterizations would be inevitably interfered by switching noises and higher system electric levels, making the arc fault detection more challenging. In this paper, dc series arc faults under the background of different switching noise interferences are conducted through the designed experimental platform firstly. Having analyzing arc faults with the single and multiple switching noise interference sources based on the signal separation method, the influence of switching noises on arc electrical characterizations is discussed. For arc faults with these inference factors, the existing arc fault features used in the resistive system indicate some limitations, leading to new arc fault detection difficulties. Finally, corresponding measures are taken to give the larger arc fault time discovery pulse and better separated arc fault states. The enlarged arc fault differences are of great benefit to improve the detection effectiveness in these complicated scenes.

Keyword :

DC series arc faults interaction analysis higher electric lowly switching noises feature improvement

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Chen, Silei , Li, Xingwen . Experimental Study and Feature Improvement of DC Series Arc Faults with Switching Noise Interference [C] . 2018 : 135-142 .
MLA Chen, Silei et al. "Experimental Study and Feature Improvement of DC Series Arc Faults with Switching Noise Interference" . (2018) : 135-142 .
APA Chen, Silei , Li, Xingwen . Experimental Study and Feature Improvement of DC Series Arc Faults with Switching Noise Interference . (2018) : 135-142 .
Export to NoteExpress RIS BibTex
Numerical Study of Arc Motion Process Considering Ferromagnetic Material in Multiple Parallel Contacts System CPCI-S
会议论文 | 2018 , 211-215 | Joint Meeting of the 29th International Conference on Electrical Contacts (ICEC) / 64th IEEE Holm Conference on Electrical Contacts
Abstract&Keyword Cite

Abstract :

Air circuit breaker (ACB) is widely used in power distribution system. The movable contact of ACB consist of multiple parallel contacts and the arc will be ignited when the short-circuit current appears. This paper focuses on the arc motion process in multiple parallel contacts system. A 3-D magneto-hydro-dynamic (MHD) model of multiple parallel contacts system is built. In this model, the nonlinear B-H curve of splitter plate is used in calculation. The magnetic vector potential approach is adopted to calculate the time-varying electromagnetic field produced by the current loop. The difference of voltage drop between near-anode and near-cathode is considered. In addition, the interaction among multiple parallel contacts is included in numerical simulation. Based on this calculation, the arc voltage, temperature and current density were obtained. The arc motion process is analyzed by current density and temperature. The simulation results show that the anode arc root will appears on multiple contacts with the increase of current. The upper arc moves faster than low arc after the arc column is divided by the splitter plate.

Keyword :

near-electrode voltage drop arc motion process current density magneto-hydro-dynamic (MHD) multiple parallel contacts system

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Zhang, Baoliang , Yin, Jianing , Zhang, Penghe et al. Numerical Study of Arc Motion Process Considering Ferromagnetic Material in Multiple Parallel Contacts System [C] . 2018 : 211-215 .
MLA Zhang, Baoliang et al. "Numerical Study of Arc Motion Process Considering Ferromagnetic Material in Multiple Parallel Contacts System" . (2018) : 211-215 .
APA Zhang, Baoliang , Yin, Jianing , Zhang, Penghe , Li, Xingwen , Wang, Qian , Hou, Guobin et al. Numerical Study of Arc Motion Process Considering Ferromagnetic Material in Multiple Parallel Contacts System . (2018) : 211-215 .
Export to NoteExpress RIS BibTex
Simulation of Electrode Erosion under DC Air Arc CPCI-S
会议论文 | 2018 , 495-500 | Joint Meeting of the 29th International Conference on Electrical Contacts (ICEC) / 64th IEEE Holm Conference on Electrical Contacts
Abstract&Keyword Cite

Abstract :

The erosion of electrode plays a crucial role in the reliability and life of low-voltage circuit breaker. Therefore, developing a valid erosion model for a range of current is important. In this paper, the arc-electrode unified model is established to determine mass loss under direct current air arc. This model includes two types of electrode material erosion: vaporization and sputter erosion. A two-dimensional magnetic hydrodynamics (MHD) model is built. In this model, the molten pool and arc are combined together. And the energy balance on the interface between electrode and arc is considered. The erosion model is established on the basis of the molten pool model. The vaporization flux caused by concentration gradient is calculated using the Langmuir formula when the surface temperature of molten pool is lower than its boiling point. The vaporization rate caused by pressure gradient is bigger than it caused by concentration gradient. The vaporization rate caused by pressure gradient is calculated by the fundamental principles of gas dynamics. The sputter rate is obtained based on statistical methods. The influence of electrode gap on the erosion is also carried out. The simulation results are compared with the experimental results in order to verify the accuracy and validity of the simulation model in the current simulation conditions.

Keyword :

Electrode gap Vaporization erosion DC air arc Molten pool Sputter erosion

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Deng, Yunkun , Ma, Yi , Wang, Dada et al. Simulation of Electrode Erosion under DC Air Arc [C] . 2018 : 495-500 .
MLA Deng, Yunkun et al. "Simulation of Electrode Erosion under DC Air Arc" . (2018) : 495-500 .
APA Deng, Yunkun , Ma, Yi , Wang, Dada , Wu, Yihong , Deng, Xiaofeng , Hou, Guobin et al. Simulation of Electrode Erosion under DC Air Arc . (2018) : 495-500 .
Export to NoteExpress RIS BibTex
Simulation Analysis of Arc Evolution Process in Multiple Parallel Contact Systems EI CPCI-S SCIE Scopus
会议论文 | 2018 , 46 (8) , 2788-2793 | 18th China National Conference on Plasma Science and Technology (CNCPST)
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
Abstract&Keyword Cite

Abstract :

Air circuit breaker (ACB) is widely used in power distribution system. The movable contact of ACB consists of multiple parallel contacts and the arc will be ignited between arcing contact and static contact when the short-circuit current appears. This paper focuses on the arc evolution process at various currents in multiple parallel contact systems. A 3-D magnetohydrodynamic model of a multiple parallel contact structures is developed. In this model, the anode consists to five parallel contacts, and they are separated by insulation material. The near-electrode layer with a nonlinear voltage-current density characteristic is modeled to describe the near-electrode voltage drop, and the difference between near-anode and near-cathode layers is considered. The magnetic vector potential approach is adopted to calculate the time-varying electromagnetic field produced by the current loop. The arc evolution processes at various currents are analyzed by current density and arc voltage. It is noted that the anode arc root appears on multiple contacts with the increase of current. The arc evolution process mainly depends on the arc resistance characteristic.

Keyword :

near-electrodes voltage drop evolution process Air circuit breaker (ACB) multiple parallel contacts magnetohydrodynamic (MHD)

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Yin, Jianning , Wang, Qian , Li, Xingwen . Simulation Analysis of Arc Evolution Process in Multiple Parallel Contact Systems [C] . 2018 : 2788-2793 .
MLA Yin, Jianning et al. "Simulation Analysis of Arc Evolution Process in Multiple Parallel Contact Systems" . (2018) : 2788-2793 .
APA Yin, Jianning , Wang, Qian , Li, Xingwen . Simulation Analysis of Arc Evolution Process in Multiple Parallel Contact Systems . (2018) : 2788-2793 .
Export to NoteExpress RIS BibTex
Numerical Study of Influence of Frequency and Eddy Currents on Arc Motion in Low-Voltage Circuit Breaker EI SCIE Scopus
期刊论文 | 2018 , 8 (8) , 1373-1380 | IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
Abstract&Keyword Cite

Abstract :

The air circuit breaker used for permanent magnet wind power generation systems should switch OFF the short-circuit current of variable frequencies. This paper focuses on the influence of frequency on the behavior of air arc. A 3-D magnetohydrodynamic (MHD) model of air arc plasma was developed to investigate the arc motion process at variable frequencies. In this model, the eddy currents in the whole calculation domains including the electrodes, the splitter plate, and the arc column were considered, and the magnetic vector potential approach was adopted to calculate the electromagnetic field produced by the current loop. A thin layer of elements with a nonlinear voltage-current density characteristic surrounding the splitter plate was employed to represent the formation of new arc roots and electrodes voltage drop. Based on this model, the evolutions of arc voltage, temperature, normalized time, and current density were obtained and compared among variable frequencies. The simulation results reveal that the normalized time, the eddy current density peak in splitter plate, and the arc voltage peak increase at a higher frequency.

Keyword :

eddy current Air circuit breaker (ACB) frequency magnetohydrodynamic (MHD) motion process

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Yin, Jianning , Wang, Qian , Li, Xingwen et al. Numerical Study of Influence of Frequency and Eddy Currents on Arc Motion in Low-Voltage Circuit Breaker [J]. | IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY , 2018 , 8 (8) : 1373-1380 .
MLA Yin, Jianning et al. "Numerical Study of Influence of Frequency and Eddy Currents on Arc Motion in Low-Voltage Circuit Breaker" . | IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY 8 . 8 (2018) : 1373-1380 .
APA Yin, Jianning , Wang, Qian , Li, Xingwen , Xu, Hongyu . Numerical Study of Influence of Frequency and Eddy Currents on Arc Motion in Low-Voltage Circuit Breaker . | IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY , 2018 , 8 (8) , 1373-1380 .
Export to NoteExpress RIS BibTex
10| 20| 50 per page
< Page ,Total 14 >

Export

Results:

Selected

to

Format:
FAQ| About| Online/Total:2638/65149958
Address:XI'AN JIAOTONG UNIVERSITY LIBRARY(No.28, Xianning West Road, Xi'an, Shaanxi Post Code:710049) Contact Us:029-82667865
Copyright:XI'AN JIAOTONG UNIVERSITY LIBRARY Technical Support:Beijing Aegean Software Co., Ltd.