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The compatibility between environmentally friendly insulation gas C4F7N and α-Al2O3 (0001) surface: Theoretical and experimental insights EI SCIE
期刊论文 | 2021 , 536 | Applied Surface Science
WoS CC Cited Count: 1
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Abstract :

In this paper, the compatibility between C4F7N and α-Al2O3 (0001) surface has been evaluated based on the density functional theory (DFT). The adsorption energy, total charge transfer, states analysis, and electron density difference were obtained to analyze the interaction behavior of C4F7N on α-Al2O3 (0001) surface. The results demonstrated a chemisorption between C4F7N and α-Al2O3 (0001) surface. Moreover, the pathway of C4F7N dissociated on α-Al2O3 (0001) surface after the adsorption was determined. However, the activation energy required for the dissociation is too large to achieve, which means that the dissociation of C4F7N on α-Al2O3 surface is difficult to occur. Additionally, the thermal compatibility between α-Al2O3 and C4F7N were verified by experiments, which shows a certain compatibility between C4F7N and α-Al2O3 (0001) under up to 170 . The results demonstrate that α-Al2O3-based materials can be used as insulators in C4F7N-filled electrical equipment. © 2020 Elsevier B.V.

Keyword :

Dissociation Activated alumina Activation energy Aluminum oxide Density functional theory Charge transfer

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GB/T 7714 Zhang, Boya , Zhang, Ziyue , Li, Xingwen et al. The compatibility between environmentally friendly insulation gas C4F7N and α-Al2O3 (0001) surface: Theoretical and experimental insights [J]. | Applied Surface Science , 2021 , 536 .
MLA Zhang, Boya et al. "The compatibility between environmentally friendly insulation gas C4F7N and α-Al2O3 (0001) surface: Theoretical and experimental insights" . | Applied Surface Science 536 (2021) .
APA Zhang, Boya , Zhang, Ziyue , Li, Xingwen , Xiong, Jiayu , Yang, Tao , Deng, Yunkun . The compatibility between environmentally friendly insulation gas C4F7N and α-Al2O3 (0001) surface: Theoretical and experimental insights . | Applied Surface Science , 2021 , 536 .
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Effects of Air-blowing on the Arcing Characteristics of CO2 and CO2/C4-PFN, CO2/C5-PFK Mixtures EI
期刊论文 | 2021 , 47 (1) , 338-345 | High Voltage Engineering
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Abstract :

CO2 and its mixtures have already considered as potential substitutes for SF6, so it is interesting to investigate their arcing characteristics used for new type circuit breakers. In this paper, an experimental device for simulating the arcing process of direct action type and puffer type high-voltage load switches was designed. An experimental platform for multi-parameter comprehensive measurement was built. The experimental research was carried out on the arcing characteristics of CO2 and its mixtures with C4-PFN or C5-PFK, with stretching arc as well as nozzle-limited stretching arc under gas flow. The arc voltage, arc current, and current zero characteristics near the current zero were measured. Moreover, the Mayr arc model was applied to compare the post-arc breakdown characteristics of CO2 and its mixed gas with C4-PFN or C5-PFK under different arcing modes. It is found that the air blowing effect has a strong promotion effect on the energy dissipation of arc during the small current period. In the arcing experiment, the thermal interruption capability of CO2 gas is about 50% of SF6. The thermal interruption capability of C5-PFK-CO2 mixed gas is about 75% of SF6, and the C4-PFN-CO2 mixed gas has almost equal thermal interruption capability to SF6. In the air-blowing arc experiment, the thermal interruption capability of CO2, C5-PFK-CO2 and C4-PFN-CO2 mixed gas was about 45%, 68% and 91% of SF6, respectively. © 2021, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

Keyword :

Energy dissipation Flow of gases Mixtures Electric circuit breakers Carbon dioxide Sulfur hexafluoride Gases SF6 insulation

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GB/T 7714 Tang, Nian , Guo, Ze , Zhang, Boya et al. Effects of Air-blowing on the Arcing Characteristics of CO2 and CO2/C4-PFN, CO2/C5-PFK Mixtures [J]. | High Voltage Engineering , 2021 , 47 (1) : 338-345 .
MLA Tang, Nian et al. "Effects of Air-blowing on the Arcing Characteristics of CO2 and CO2/C4-PFN, CO2/C5-PFK Mixtures" . | High Voltage Engineering 47 . 1 (2021) : 338-345 .
APA Tang, Nian , Guo, Ze , Zhang, Boya , Li, Li , Li, Xingwen . Effects of Air-blowing on the Arcing Characteristics of CO2 and CO2/C4-PFN, CO2/C5-PFK Mixtures . | High Voltage Engineering , 2021 , 47 (1) , 338-345 .
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Investigation into geometric effect in capillary discharge plasma generator using an improved ablation model EI SCIE
期刊论文 | 2020 , 53 (23) | JOURNAL OF PHYSICS D-APPLIED PHYSICS | IF: 3.207
WoS CC Cited Count: 1
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Abstract :

The wall material and the electrode material together determine the composition of the capillary discharge plasma. In this paper, an improved ablation model considering polyethylene (PE) and copper ablation and deposition was developed. Generators with different geometric sizes were calculated and tested. The results show that the concentration distributions of copper and PE in the generator were the pair-wise opposite, and the aspect ratio (AR) had a threshold (AR = 8.67). The copper mass density distribution varied from uniform to inhomogeneous with the increase in AR, which was similar to that of its concentration distribution. The maximum copper mass density increased with the increase in AR, and the AR threshold was also 8.67. The relationship between the copper or PE ablated mass and capillary length or diameter approximately followed a power law, and the relationship between the copper or PE ablated mass and AR approximately followed a proportional law. The PE mass density distribution was not similar to that of its concentration for AR >= 8.67. The PE ablated mass increased with the increase in AR, and its variation was similar to that of the maximum PE mass density. When the AR(AR > 5.2) was large enough, the PE mass density distribution determined the total mass density distribution. Otherwise, the total mass density distribution was determined by the mass density distribution of PE and copper. Overall, the simulation results were in good agreement with the experiments. These can be used to select the size and material of the capillary in simulating high heat flux plasma or electrothermal chemical gun ignition.

Keyword :

generator geometry ablation model aspect ratios mass density capillary discharge

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GB/T 7714 Zhang, Jiangbo , Li, Xingwen , Chen, Li et al. Investigation into geometric effect in capillary discharge plasma generator using an improved ablation model [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2020 , 53 (23) .
MLA Zhang, Jiangbo et al. "Investigation into geometric effect in capillary discharge plasma generator using an improved ablation model" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 53 . 23 (2020) .
APA Zhang, Jiangbo , Li, Xingwen , Chen, Li , Zhao, Yuhua , Liang, Lei , Xiao, Xia . Investigation into geometric effect in capillary discharge plasma generator using an improved ablation model . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2020 , 53 (23) .
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Understanding titanium carbide nanoparticle formation by an underwater electrical explosion process through experimental and modeling studies EI SCIE
期刊论文 | 2020 , 27 (2) | PHYSICS OF PLASMAS | IF: 2.023
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Abstract :

A new approach has been presented herein to prepare nano titanium carbide based on the underwater electrical explosion approach. Scanning electron microscopy and x-ray photoelectron spectroscopy were used to investigate the morphology and composition of the electrical explosion products. A numerical model was established to investigate the nanoparticle formation process. The results show that the average diameter of the formed nanoparticles was similar to 60nm and approximately conformed to a lognormal distribution. Compared with the nanoparticles prepared by electrical explosion in gas, the nanoparticles prepared by the underwater electrical explosion had a smaller size distribution range and better sphericity. During the formation process of nanoparticles, the distribution of nanoparticles formed in a narrow temperature range near the specific temperature directly determined the characteristics of the final electrical explosion products. The specific temperature was similar to 3400K, which was also the specific temperature of the saturation ratio, the nucleation rate, the average diameter of the formed nuclei, the number of monomers, and the number of the formed nanoparticles. The diameters of nanoparticles obtained in the experiment were mainly concentrated between 50 and 70nm, and the calculated diameters of the nanoparticles were mainly concentrated between 55 and 65nm; therefore, the data obtained through the model were consistent with the experimental ones. These provide a way to synthesize the nano titanium carbide and a method to estimate their size and distribution, and it is hoped for understanding the evolution of the titanium wire underwater electrical explosion and the formation of nanoparticles. Published under license by AIP Publishing.

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GB/T 7714 Zhang, Jiangbo , Li, Xingwen , Shi, Huantong et al. Understanding titanium carbide nanoparticle formation by an underwater electrical explosion process through experimental and modeling studies [J]. | PHYSICS OF PLASMAS , 2020 , 27 (2) .
MLA Zhang, Jiangbo et al. "Understanding titanium carbide nanoparticle formation by an underwater electrical explosion process through experimental and modeling studies" . | PHYSICS OF PLASMAS 27 . 2 (2020) .
APA Zhang, Jiangbo , Li, Xingwen , Shi, Huantong , Zhao, Yuhua , Liang, Lei , Yan, Wenrong et al. Understanding titanium carbide nanoparticle formation by an underwater electrical explosion process through experimental and modeling studies . | PHYSICS OF PLASMAS , 2020 , 27 (2) .
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Study on Electrical Explosion Mechanism and Ignition Characteristics of Copper and Aluminum Powder under Ignition Solid Propellant EI SCIE
期刊论文 | 2020 , 48 (6) , 2035-2041 | IEEE Transactions on Plasma Science | IF: 1.222
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Abstract :

In order to study the characteristic of the electrical explosion of copper and aluminum powders, a multilayer generator was designed, an experimental system was set up, and the parameters of metal powder electrical explosion were measured and analyzed. The results show that the duration of the electrical explosion process increases significantly due to the addition of metal powder. The duration of aluminum powder electrical explosion jet flow is 86.36 ms due to its self-sustained combustion, which releases a large amount of energy, and a small fraction of aluminum powder particles is not burned. The duration of copper powder electrical explosion jet flow is 15.84 ms, and most of the copper powder particles are in the solid state. The current pause process is absent; instead, the first discharge process is connected to the second discharge process. The effect of copper powder on the first discharge process is greater than that of aluminum powder. Furthermore, the ignition ability of copper powder electrical explosion to solid propellant is stronger than that of aluminum powder in a closed bomb experiment. These results are indubitably meaningful for the application of metal powder electrical explosion and ignition of solid propellant in an electrothermal chemical gun. © 1973-2012 IEEE.

Keyword :

Aluminum Copper powder Solid propellants Explosions

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GB/T 7714 Zhang, Jiangbo , Chen, Li , Yang, Weihong et al. Study on Electrical Explosion Mechanism and Ignition Characteristics of Copper and Aluminum Powder under Ignition Solid Propellant [J]. | IEEE Transactions on Plasma Science , 2020 , 48 (6) : 2035-2041 .
MLA Zhang, Jiangbo et al. "Study on Electrical Explosion Mechanism and Ignition Characteristics of Copper and Aluminum Powder under Ignition Solid Propellant" . | IEEE Transactions on Plasma Science 48 . 6 (2020) : 2035-2041 .
APA Zhang, Jiangbo , Chen, Li , Yang, Weihong , Li, Xingwen . Study on Electrical Explosion Mechanism and Ignition Characteristics of Copper and Aluminum Powder under Ignition Solid Propellant . | IEEE Transactions on Plasma Science , 2020 , 48 (6) , 2035-2041 .
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Analysis of Thermal Characteristics of Switch Cabinet with Multi-Physics Field Coupling Method EI
会议论文 | 2020 , 2020-September , 28-34 | 66th IEEE Holm Conference on Electrical Contacts and Intensive Course, HLM 2020
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Abstract :

Overheating is one of the key factors affecting the normal service life of switch cabinets. Therefore, it is of great significance to find out methods to reduce the temperature rise of the switch cabinet. In this paper, based on a 400V low-voltage switchgear, a three-dimensional simulation model is established using the electromagnetic-thermal-fluid multi-physics coupling method. Under the conditions of simulating natural convection, considering eddy current effects, proximity effects, and skin effects, heat transfer methods such as thermal conduction, thermal convection, and thermal radiation are comprehensively used to calculate and analyze the thermal distribution characteristics of the distribution cabinet shells and three-phase current-carrying conductors. Moreover, a temperature-rise experiment is performed to verify the feasibility and accuracy of the electromagnetic-thermal-fluid multi-physics coupling method and the accuracy and effectiveness of the calculation model under the current simulation conditions. In addition, in order to reduce the temperature rise of the cabinet, A strategy for optimizing the switchgear is proposed, and the heat distribution characteristics of the optimized model is calculated using the multi-physics coupling method. The results show that the temperature rise of the switch cabinets of the scheme has been reduced in different degrees, which effectively solves the overheating problem of the switch cabinet. © 2020 IEEE.

Keyword :

Radiation effects Heat convection Eddy current testing Electric contacts Heat radiation

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GB/T 7714 Tang, Nian , Xu, Hongyu , Bai, Xiaofeng et al. Analysis of Thermal Characteristics of Switch Cabinet with Multi-Physics Field Coupling Method [C] . 2020 : 28-34 .
MLA Tang, Nian et al. "Analysis of Thermal Characteristics of Switch Cabinet with Multi-Physics Field Coupling Method" . (2020) : 28-34 .
APA Tang, Nian , Xu, Hongyu , Bai, Xiaofeng , Li, Xingwen . Analysis of Thermal Characteristics of Switch Cabinet with Multi-Physics Field Coupling Method . (2020) : 28-34 .
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Research and Application on Physical Farameters Calculation and Behavior Simulation of Gas Switching Arc EI CSCD Scopus
期刊论文 | 2020 , 46 (3) , 757-771 | High Voltage Engineering
SCOPUS Cited Count: 1
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Abstract :

Arc physics and characteristic control are the basic and important technological issues in the field of electric power apparatus. Enormous studies have been carried out in academic and industrial institutions in recent decades, which strongly support the development of high-performance power switchgear and the technological advancement. This paper reviews the recent research progress in high and low-voltage gas switchgear with air and SF6 and their alternative gases from the following aspects: physical parameters (including thermodynamic properties, transport coefficient, collision cross section, thermal critical breakdown field strength and so on), arc Magneto-Hydro-Dynamical (MHD) model simulation and its application, effects of different factors on the arc characteristics and its control regulations and so on. Besides, some issues are proposed and should be deal with in further study, involving the experimental measurement of arc plasma thermodynamic parameters, the arc model of three-dimensional gas switchgear considering the non-equilibrium breakdown process in the post-arc period, the physical characteristics of DC fault arc and the efficient detection technology, the arc extinguishing technology of SF6 alternative gas. Some valuable references are expected to provide for exploration on the gas switchgear arc theory, arc extinguishing technology and new power switchgear equipment. © 2020, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

Keyword :

Magnetohydrodynamics Gases SF6 insulation Petroleum prospecting Sulfur hexafluoride

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GB/T 7714 Li, Xingwen , Jia, Shenli , Zhang, Boya . Research and Application on Physical Farameters Calculation and Behavior Simulation of Gas Switching Arc [J]. | High Voltage Engineering , 2020 , 46 (3) : 757-771 .
MLA Li, Xingwen et al. "Research and Application on Physical Farameters Calculation and Behavior Simulation of Gas Switching Arc" . | High Voltage Engineering 46 . 3 (2020) : 757-771 .
APA Li, Xingwen , Jia, Shenli , Zhang, Boya . Research and Application on Physical Farameters Calculation and Behavior Simulation of Gas Switching Arc . | High Voltage Engineering , 2020 , 46 (3) , 757-771 .
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Progress of laser-induced breakdown spectroscopy in nuclear industry applications EI SCIE
期刊论文 | 2020 , 53 (2) | JOURNAL OF PHYSICS D-APPLIED PHYSICS | IF: 3.207
WoS CC Cited Count: 18
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Abstract :

In order to ensure the safety and economy of nuclear industry production, the analysis of nuclear materials and other materials used in nuclear industry environments are usually required before and during their installation and utilization, and after service. The advantages of laser-induced breakdown spectroscopy (LIBS), such as sample preparation not being required and in situ remote analysis, make it an efficient method for the analysis of hazardous samples and samples in remotely accessible or hazardous environments. The nuclear industry has become one of the fast-growing fields of LIBS application. In this review, the feasibility of LIBS in the nuclear industry is summarized from the aspects of the physical fundamentals of plasma, instrumentation, spectral analysis, and application progress. The radiation characteristics of LIBS and spectral lines of interest are discussed, along with the main influencing factors and spectral enhancement methods. LIBS instruments and spectral analysis methods used for identification are then presented, and qualitative and quantitative analysis. The various applications of LIBS in the nuclear industry and in fusion facilities are described, including the analysis of nuclear materials, isotopes, and steels and alloys. Finally, the challenges currently being encountered by LIBS applications and its potential development direction are considered.

Keyword :

nuclear materials isotopic analysis fusion facility nuclear industry laser-induced breakdown spectroscopy laser-produced plasma steel/alloy analysis

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GB/T 7714 Wu, Jian , Qiu, Yan , Li, Xingwen et al. Progress of laser-induced breakdown spectroscopy in nuclear industry applications [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2020 , 53 (2) .
MLA Wu, Jian et al. "Progress of laser-induced breakdown spectroscopy in nuclear industry applications" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 53 . 2 (2020) .
APA Wu, Jian , Qiu, Yan , Li, Xingwen , Yu, Han , Zhang, Zhi , Qiu, Aici . Progress of laser-induced breakdown spectroscopy in nuclear industry applications . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2020 , 53 (2) .
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Effects of wire materials on radiative heat flux and spectral characteristics of a capillary discharge plasma jet EI SCIE
期刊论文 | 2020 , 53 (7) | Journal of Physics D: Applied Physics | IF: 3.207
WoS CC Cited Count: 4
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Abstract :

Capillary discharge plasmas have been widely used in many fields. This paper investigates the influence of different explosion wire materials on the radiative heat flux and spectral characteristics. Three kinds of wire (aluminum, copper and nickel) with 0.3 mm diameter were used as initiation wires to produce an electrothermal plasma, with a capacitor charging voltage of 3 kV. A thin-film calorimeter with high response speed was used for the measurement of the radiative heat flux. At the same time, spectral analysis was performed using a spatially resolved spectrometer with an ICCD. Based on the results, the electrical energy transported to the plasma that is calculated from the voltage and current traces follows the order Cu > Al > Ni, while the radiative heat flux follows the order Al > Cu > Ni. The trends can be explained by the secondary combustion (chemical reaction with the air) of Al and the fact that the dissipated energy is smaller than the vaporization energy for Ni but larger for Al and Cu, resulting in a bad performance in jet heat flux due to the incomplete vaporization of Ni wires. For the Cu and Al cases, a four-stage evolution process of the emitted radiation, which describes the emission, absorption and decay processes, can be found from the spectral analysis. © 2019 IOP Publishing Ltd.

Keyword :

Plasma theory Thin films Vaporization Calorimeters Heat flux Energy dissipation Spectrum analysis Plasma jets Capillary flow Wire Electric discharges

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GB/T 7714 Yang, Weihong , Hang, Yuhua , Fan, Hao et al. Effects of wire materials on radiative heat flux and spectral characteristics of a capillary discharge plasma jet [J]. | Journal of Physics D: Applied Physics , 2020 , 53 (7) .
MLA Yang, Weihong et al. "Effects of wire materials on radiative heat flux and spectral characteristics of a capillary discharge plasma jet" . | Journal of Physics D: Applied Physics 53 . 7 (2020) .
APA Yang, Weihong , Hang, Yuhua , Fan, Hao , Chen, Li , Li, Xingwen , Murphy, Anthony B . Effects of wire materials on radiative heat flux and spectral characteristics of a capillary discharge plasma jet . | Journal of Physics D: Applied Physics , 2020 , 53 (7) .
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Contact Erosion Characteristics Under Direct Current Air Arc EI CSCD
期刊论文 | 2020 , 46 (6) , 1970-1977 | High Voltage Engineering
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The erosion of contact material plays a crucial role in the reliability and life of low-voltage circuit breaker. Therefore, it is important to develop an erosion model. In this paper, the contact erosion model including both vaporization and sputter erosion is established to determine the mass loss under direct current air arc. A two-dimensional magnetic hydrodynamics (MHD) for molten pool is combined with the solidification and melting model to calculate the melting phase change process. Moreover, the vaporization erosion model and sputter erosion model are established on the basis of molten pool model. The vaporization erosion model is based on the Langmuir formula and the gas dynamics. The relations between vaporization flux and surface temperature of molten pool is analyzed. The sputter erosion model is built based on statistical methods and the mass loss of sputter erosion is obtained. In addition, the influences of material property, current, the size and shape of contact on the contact erosion are studied so as to obtain an effective way to reduce contact erosion. The results show that the evaporation erosion is dominated when the current is lower than 20 A. The sputter erosion plays the major role when the current is higher than 200 A. On the premise of ensuring that the contact size is greater than the size of the molten pool, reducing the radius of cylindrical contact can reduce erosion, but the effect is minimal. Under the same conditions, the erosion mass of the domed contact is the greatest. The erosion mass of the cone-like contact comes next and the erosion mass of the cylindrical contact is the least. © 2020, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

Keyword :

Gas dynamics Magnetohydrodynamics Vaporization Electric circuit breakers Melting Erosion

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GB/T 7714 Li, Xingwen , Lü, Qishen , Tian, Tian et al. Contact Erosion Characteristics Under Direct Current Air Arc [J]. | High Voltage Engineering , 2020 , 46 (6) : 1970-1977 .
MLA Li, Xingwen et al. "Contact Erosion Characteristics Under Direct Current Air Arc" . | High Voltage Engineering 46 . 6 (2020) : 1970-1977 .
APA Li, Xingwen , Lü, Qishen , Tian, Tian , Wu, Yihong , Tang, Feng . Contact Erosion Characteristics Under Direct Current Air Arc . | High Voltage Engineering , 2020 , 46 (6) , 1970-1977 .
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