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< Page ,Total 38 >
A Novel Topology of a Liquid Metal Current Limiter for MVDC Network Applications SCIE
期刊论文 | 2019 , 34 (2) , 661-670 | IEEE TRANSACTIONS ON POWER DELIVERY
WoS CC Cited Count: 1
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Abstract :

A liquid metal current limiter (LMCL) utilizing a fast switch and a parallel connecting path and consisting of several serial current limiting elements (CLEs) has the potential for use in a dc system. The current commutation ability is vital to the reaction time and the current limiting efficiency of this LMCL. In this paper, the characteristics of a natural current commutation driven by the arc voltage between contacts are first revealed; this method can only be applied in a low-voltage system. To fulfill the demands of a medium-voltage direct current system, an innovative LMCL topology is recommended due to the forced current commutation driven by an auxiliary magnetic induction module. A specially designed structure of magnetic coupling coils with a high coupling coefficient is proposed to improve the current commutation ability. The forced current commutation characteristic is analyzed via simulation and verified experimentally. Furthermore, the arc V-I characteristics of CLEs are deeply discussed to guide the selection of serial quantity of the CLE. Finally, a prototype for the complete LMCL is designed, assembled, and tested in the laboratory. The current limiting coefficient of the LMCL is less than 0.464, the peak value of arc voltage is approximately 6.3 kV, and the current limiting reaction time is 1.53 ms.

Keyword :

Fault current limiters (FCLs) GaInSn liquid metal current commutation medium-voltage direct current (MVDC)

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GB/T 7714 Yang, Zhuo , He, Hailong , Yang, Fei et al. A Novel Topology of a Liquid Metal Current Limiter for MVDC Network Applications [J]. | IEEE TRANSACTIONS ON POWER DELIVERY , 2019 , 34 (2) : 661-670 .
MLA Yang, Zhuo et al. "A Novel Topology of a Liquid Metal Current Limiter for MVDC Network Applications" . | IEEE TRANSACTIONS ON POWER DELIVERY 34 . 2 (2019) : 661-670 .
APA Yang, Zhuo , He, Hailong , Yang, Fei , Wu, Yi , Rong, Mingzhe , Zhao, Peng et al. A Novel Topology of a Liquid Metal Current Limiter for MVDC Network Applications . | IEEE TRANSACTIONS ON POWER DELIVERY , 2019 , 34 (2) , 661-670 .
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Combined Diffusion Coefficients in CO2 Thermal Plasmas Contaminated with Cu, Fe or Al EI SCIE Scopus
期刊论文 | 2018 , 38 (5) , 1133-1149 | PLASMA CHEMISTRY AND PLASMA PROCESSING
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Abstract :

Our work aims at the computation of combined diffusion coefficients in CO2-metal (Cu, Fe, Al) mixtures at a temperature interval of 2000-30,000 K at 0.1 MPa and aims at the investigation of the impact of the concentration and nature of metal vapor (Cu, Fe, Al) on diffusion phenomena. The combined diffusion coefficients have four components, more specifically, combined ordinary diffusion coefficient, combined electric field diffusion coefficient, combined temperature diffusion coefficient and combined pressure diffusion coefficient due to the gradients of the species densities, applied electrical field temperature and pressure. The results indicate that, for Cu and Fe, the combined diffusion coefficients are quite identical under the condition of same metal concentrations (1 and 10% mass concentration). Compared with Cu and Fe under the same metal concentrations (1 and 10%), Al results in a larger enhancement of combined electric field and ordinary diffusion coefficients while smaller enhancement of combined temperature diffusion coefficients. All the combined diffusion coefficients exhibit an upward trend with metal concentrations except for combined electric field, temperature and pressure diffusion coefficients. These three mentioned coefficients are attenuated by the metal vapor above the certain concentration such as, in the case of combined temperature diffusion coefficients, 70% Cu, 70% Fe and 50% Al for CO2-Cu, CO2-Fe and CO2-Al mixtures respectively. Namely, compared with Cu and Fe, less quantity of Al is required to achieve the maximum of combined diffusion coefficients. Maximum peaks for the combined coefficients are shifted to the higher temperature with increasing metal concentrations.

Keyword :

Plasma arc Diffusion coefficients Metal CO2

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GB/T 7714 Liu, Yang , Zhong, Linlin , Yang, Aijun et al. Combined Diffusion Coefficients in CO2 Thermal Plasmas Contaminated with Cu, Fe or Al [J]. | PLASMA CHEMISTRY AND PLASMA PROCESSING , 2018 , 38 (5) : 1133-1149 .
MLA Liu, Yang et al. "Combined Diffusion Coefficients in CO2 Thermal Plasmas Contaminated with Cu, Fe or Al" . | PLASMA CHEMISTRY AND PLASMA PROCESSING 38 . 5 (2018) : 1133-1149 .
APA Liu, Yang , Zhong, Linlin , Yang, Aijun , Wang, Xiaohua , Rong, Mingzhe , Wu, Junhui . Combined Diffusion Coefficients in CO2 Thermal Plasmas Contaminated with Cu, Fe or Al . | PLASMA CHEMISTRY AND PLASMA PROCESSING , 2018 , 38 (5) , 1133-1149 .
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Investigation on the RONS and bactericidal effects induced by He + O2 cold plasma jets: In open air and in an airtight chamber EI Scopus SCIE
期刊论文 | 2018 , 25 (11) | Physics of Plasmas
SCOPUS Cited Count: 2
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Abstract :

© 2018 Author(s). He + O2 plasma jets in open air and in an airtight chamber are comparatively studied, with respect to their production of gaseous/aqueous reactive species and their antibacterial effects. Under the same discharge power, the plasma jet in open air has higher densities of gaseous reactive species and a higher concentration of aqueous H2O2 but lower concentrations of aqueous OH and O2 -. In addition, the increase in the O2 ratio in He in both plasma jets causes a linear decrease in the population of gaseous reactive species, except for O(3p5P) when a small amount of O2 is added to the working gas. The concentrations of aqueous reactive species for OH and H2O2 also drop monotonically with the increase in additive O2, while the aqueous O2 - first increases and then decreases. Moreover, it is interesting that the bactericidal inactivation in the airtight chamber condition is much greater than that in the open air condition regardless of the presence or absence of additive O2 in the He plasma jet. The concentration trends of O2 - for both the plasma jets are similar to their antibacterial effects, and little antibacterial effect is achieved when a scavenger of O2 - is used, indicating that O2 - should be a main antibacterial agent. Moreover, it should not be O2 - alone to achieve the antibacterial effect, and some reactive nitrogen species such as ONOO- and O2NOO- might also play an important role.

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GB/T 7714 Xu, Han , Liu, Dingxin , Wang, Weitao et al. Investigation on the RONS and bactericidal effects induced by He + O2 cold plasma jets: In open air and in an airtight chamber [J]. | Physics of Plasmas , 2018 , 25 (11) .
MLA Xu, Han et al. "Investigation on the RONS and bactericidal effects induced by He + O2 cold plasma jets: In open air and in an airtight chamber" . | Physics of Plasmas 25 . 11 (2018) .
APA Xu, Han , Liu, Dingxin , Wang, Weitao , Liu, Zhijie , Guo, Li , Rong, Mingzhe et al. Investigation on the RONS and bactericidal effects induced by He + O2 cold plasma jets: In open air and in an airtight chamber . | Physics of Plasmas , 2018 , 25 (11) .
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Calculation of electron-impact ionization cross sections of perfluoroketone (PFK) molecules CxF2xO (x=1-5) based on Binary-Encounter-Bethe (BEB) and Deutsch-Mark (DM) methods EI SCIE Scopus
期刊论文 | 2018 , 27 (9) | PLASMA SOURCES SCIENCE & TECHNOLOGY
WoS CC Cited Count: 2 SCOPUS Cited Count: 2
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Abstract :

Perfluoroketone (PFK) gases are widely used in industry, e.g. as an insulating medium in high-voltage apparatus and as a cleaning agent in chemical vapor deposition (CVD) chambers. A great deal of attention has been paid to them recently because of their low global warming potential (GWP). In order to describe the ionization processes in various plasmas resulting from PFK gases, the electron-impact ionization cross sections (Q(ion)) of PFK molecules CxF2xO (x = 1-5) were calculated by the Binary-Encounter Bethe (BEB) and the Deutsch-Mark (DM) methods. The chemical structures of PFK molecules were optimized by the hybrid Density Functional Theory (DFT) method with the Austin-Petersson-Frisch functional including dispersion (APF-D). The binding and kinetic energies of electrons in molecular orbitals were also determined with the APF-D hybrid DFT method. The binding energies of valence electrons were then improved by the electron propagator theory (EPT) method. The ionization potentials of PFK molecules were calculated as the difference between the energy of a molecule and its cation using the complete basis set (CBS) method. The molecular orbital compositions were obtained by the natural atomic orbital (NAO) analysis. The results show that Q(ion) determined by the BEB method are always larger than those by the DM method. The difference is reduced with the EPT corrections considered. The comparison between the theoretical and experimental Q(ion) demonstrates that the EPT correction improves Q(ion) considerably.

Keyword :

binary-encounter-bethe method density functional theory deutsch-Mark method electron propagator theory ionization cross section natural atomic orbital

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GB/T 7714 Zhong, Linlin , Wang, Jiayu , Wang, Xiaohua et al. Calculation of electron-impact ionization cross sections of perfluoroketone (PFK) molecules CxF2xO (x=1-5) based on Binary-Encounter-Bethe (BEB) and Deutsch-Mark (DM) methods [J]. | PLASMA SOURCES SCIENCE & TECHNOLOGY , 2018 , 27 (9) .
MLA Zhong, Linlin et al. "Calculation of electron-impact ionization cross sections of perfluoroketone (PFK) molecules CxF2xO (x=1-5) based on Binary-Encounter-Bethe (BEB) and Deutsch-Mark (DM) methods" . | PLASMA SOURCES SCIENCE & TECHNOLOGY 27 . 9 (2018) .
APA Zhong, Linlin , Wang, Jiayu , Wang, Xiaohua , Rong, Mingzhe . Calculation of electron-impact ionization cross sections of perfluoroketone (PFK) molecules CxF2xO (x=1-5) based on Binary-Encounter-Bethe (BEB) and Deutsch-Mark (DM) methods . | PLASMA SOURCES SCIENCE & TECHNOLOGY , 2018 , 27 (9) .
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The effect of ethanol gas impurity on the discharge mode and discharge products of argon plasma jet at atmospheric pressure EI SCIE Scopus
期刊论文 | 2018 , 27 (5) | PLASMA SOURCES SCIENCE & TECHNOLOGY
WoS CC Cited Count: 5 SCOPUS Cited Count: 4
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Argon is a widely used working gas of plasmas, which is much cheaper than helium but on the other hand much more difficult to generate diffuse discharge at atmospheric pressure. In order to meet the application requirements, plenty of researches have been reported to facilitate the diffuse discharge happening for argon plasmas, and in this paper an approach of using ethanol gas (EtOH) impurity is investigated. The discharge characteristics of Ar + EtOH plasma jet are studied as a function of the applied voltage and the concentration of EtOH, from which the concentration of EtOH between similar to 200 and similar to 3300 parts per million (ppm) is determined necessary for the generation of diffuse discharge. Compared with the helium plasma jet in literature, it is deduced that the diffuse discharge is probably caused by the Penning ionization happening between the metastable argon and EtOH. The discharge products of Ar. +. EtOH (672 ppm) plasma jet are measured and the corresponding chemistry pathways are analyzed. About 20% of EtOH is decomposed via complex chemical reactions to form more than a dozen of neutral species, such as CH3CHO, CH3COOH, CO, H2O, and CnH2n+2 (n >= 3), and various kinds of ionic species, including C+, CH+, ArH+, O-2(-), CH3CH2O-, etc.

Keyword :

chemistry pathways argon plasma jet diffuse discharge ethanol

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GB/T 7714 Xia, Wenjie , Liu, Dingxin , Xu, Han et al. The effect of ethanol gas impurity on the discharge mode and discharge products of argon plasma jet at atmospheric pressure [J]. | PLASMA SOURCES SCIENCE & TECHNOLOGY , 2018 , 27 (5) .
MLA Xia, Wenjie et al. "The effect of ethanol gas impurity on the discharge mode and discharge products of argon plasma jet at atmospheric pressure" . | PLASMA SOURCES SCIENCE & TECHNOLOGY 27 . 5 (2018) .
APA Xia, Wenjie , Liu, Dingxin , Xu, Han , Wang, Xiaohua , Liu, Zhijie , Rong, Mingzhe et al. The effect of ethanol gas impurity on the discharge mode and discharge products of argon plasma jet at atmospheric pressure . | PLASMA SOURCES SCIENCE & TECHNOLOGY , 2018 , 27 (5) .
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Investigation of an Active Current Injection DC Circuit Breaker Based on a Magnetic Induction Current Commutation Module EI SCIE Scopus
期刊论文 | 2018 , 33 (4) , 1809-1817 | IEEE TRANSACTIONS ON POWER DELIVERY
WoS CC Cited Count: 2 SCOPUS Cited Count: 4
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Abstract :

Active current injection circuit breakers (ACICBs), which utilize the mechanical switch and a parallel-connected precharged capacitor, have broad application prospects in future multiterminal dc grids. However, with the increase of system voltage, the precharged capacitor leads to the great cost and size being spent on the charging circuit and auxiliary commutating appliances. To address this shortcoming, an innovative de circuit breaker (DCCB) based on a magnetic induction current commutation module (MICCM) is proposed. The influence of the main component parameters on the commutation performance is investigated by calculation, in which the self-, mutual, and stray inductances are involved. Besides, the validity of calculation is experimentally proved. Then, by applying the MICCM to the ACICB, the breaking characteristics of the ACICB are analyzed in detail. Finally, a 10-kV DCCB prototype is developed, verifying the feasibility of current commutation concept and the validity of simulated interruption results. Our studies show that a 10-kA bidirectional fault current can he interrupted successfully with a commutation duration less than 250 mu s.

Keyword :

current commutation dc interruption dc circuit breaker Active current injection

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GB/T 7714 Wu, Yi , Hu, Yang , Wu, Yifei et al. Investigation of an Active Current Injection DC Circuit Breaker Based on a Magnetic Induction Current Commutation Module [J]. | IEEE TRANSACTIONS ON POWER DELIVERY , 2018 , 33 (4) : 1809-1817 .
MLA Wu, Yi et al. "Investigation of an Active Current Injection DC Circuit Breaker Based on a Magnetic Induction Current Commutation Module" . | IEEE TRANSACTIONS ON POWER DELIVERY 33 . 4 (2018) : 1809-1817 .
APA Wu, Yi , Hu, Yang , Wu, Yifei , Rong, Mingzhe , Yi, Qiang . Investigation of an Active Current Injection DC Circuit Breaker Based on a Magnetic Induction Current Commutation Module . | IEEE TRANSACTIONS ON POWER DELIVERY , 2018 , 33 (4) , 1809-1817 .
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Study of the Arc Ignition Characteristics of Liquid Metal Current Limiter Based on Magnetic Pinch Effect EI Scopus CSCD PKU
期刊论文 | 2017 , 37 (4) , 1053-1061 | Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering
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Abstract :

The liquid metal current limiter (LMCL) based on magnetic pinch effect has a good application prospect in the future LV and MV power system with its merits of small volume, simple structure, self-activation and self-healing in case of a fault. The high-speed camera was adopted to observe the dynamic pinch process of liquid metal. Then its pre-arcing time was measured. In addition, this physical process was also studied and analyzed by simulation. The arc ignition characteristics of liquid metal were fully investigated with the three aforementioned methods on account of different factors. They are the initial height of the liquid's free surface, roughness of the spacer's channel and the increasing rate of prospective current. The results demonstrate that the pinch process of liquid metal always includes two processes, i.e. the pinch process from its free surface and the direct pinch process of the liquid column in the channel. Their effects and influences for each was obtained, which can act as the basis for structural design and performance optimization for future LMCLs. © 2017 Chin. Soc. for Elec. Eng.

Keyword :

Application prospect Arc ignition Free surfaces Liquid Metal Current Limiter Liquid metal current limiter (LMCL) Performance optimizations Prearcing time Simple structures

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GB/T 7714 He, Hailong , Wu, Yi , Liu, Wei et al. Study of the Arc Ignition Characteristics of Liquid Metal Current Limiter Based on Magnetic Pinch Effect [J]. | Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering , 2017 , 37 (4) : 1053-1061 .
MLA He, Hailong et al. "Study of the Arc Ignition Characteristics of Liquid Metal Current Limiter Based on Magnetic Pinch Effect" . | Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 37 . 4 (2017) : 1053-1061 .
APA He, Hailong , Wu, Yi , Liu, Wei , Niu, Chunping , Rong, Mingzhe , Yang, Zhuo et al. Study of the Arc Ignition Characteristics of Liquid Metal Current Limiter Based on Magnetic Pinch Effect . | Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering , 2017 , 37 (4) , 1053-1061 .
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开关电弧电流零区非平衡态等离子体仿真研究现状 CSCD PKU
期刊论文 | 2017 , (2) , 1-12,23 | 电工技术学报
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Abstract :

针对电弧电流零区的仿真研究对于指导断路器研发设计、提高其开断能力进而深入认识零区电弧等离子体的发展过程具有重要意义.由于零区电弧等离子体的发展过程涉及气流、热、电磁场的共同作用,对该复杂过程的描述仍是研究工作的难点.由于电弧电流零区电弧动态行为的特殊性,研究早期提出的局部热力学平衡假设在这一阶段并不适用,预测的电弧行为与实际情况会产生一定偏差.近年来,基于热力学非平衡及化学非平衡假设的理论研究,展现出与实验较好的吻合性,成为现今电弧电流零区仿真计算的热点.本文分别介绍基于热力学非平衡和化学非平衡假设对电弧电流零区电弧等离子体仿真建模的发展情况,以及相关实验进展,并对未来电弧电流零区电弧等离子体仿真研究做了展望.

Keyword :

电弧电流零区 化学非平衡 热力学非平衡 仿真计算

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GB/T 7714 荣命哲 , 吴翊 , 杨飞 et al. 开关电弧电流零区非平衡态等离子体仿真研究现状 [J]. | 电工技术学报 , 2017 , (2) : 1-12,23 .
MLA 荣命哲 et al. "开关电弧电流零区非平衡态等离子体仿真研究现状" . | 电工技术学报 2 (2017) : 1-12,23 .
APA 荣命哲 , 吴翊 , 杨飞 , 孙昊 , 纽春萍 , 段嘉炜 . 开关电弧电流零区非平衡态等离子体仿真研究现状 . | 电工技术学报 , 2017 , (2) , 1-12,23 .
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具有远程专家自诊断功能的智能化GIS
期刊论文 | 2017 , (1) , 75-83 | 智能电网
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智能化GIS作为智能变电站最重要的设备之一,当前因其智能化程度低,在提取设备自身故障模式的典型特征参数并进行智能化分析处理方面还处于探索应用阶段,距离其具有高度自诊断能力还有一定的距离,这些因素影响智能变电站在数据高级应用方面建设的步伐.首先给出具有远程专家自诊断功能的智能化GIS的特征定义,对物联网技术、互联网技术和移动互联网技术在智能化GIS上的具体应用进行深入分析探讨,对基于云计算技术和大数据技术的D-S证据理论状态监测决策的远程专家诊断中心模型进行初步分析探讨.最后通过550 kV某水电站典型案例,对具有远程专家自诊断功能的智能化GIS在实际工程上的具体应用进行介绍.具有远程专家自诊断功能的智能化GIS在智能电网的广泛应用必将带来行业的变革,将智能变电站的发展推向新的阶段.

Keyword :

云计算 智能化GIS 远程自诊断 智能传感器 大数据

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GB/T 7714 白世军 , 曾林翠 , 张永强 et al. 具有远程专家自诊断功能的智能化GIS [J]. | 智能电网 , 2017 , (1) : 75-83 .
MLA 白世军 et al. "具有远程专家自诊断功能的智能化GIS" . | 智能电网 1 (2017) : 75-83 .
APA 白世军 , 曾林翠 , 张永强 , 张豪俊 , 张猛 , 王小华 et al. 具有远程专家自诊断功能的智能化GIS . | 智能电网 , 2017 , (1) , 75-83 .
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Influence of the axial magnetic field on sheath development after current zero in a vacuum circuit breaker EI SCIE CPCI-S Scopus CSCD
会议论文 | 2017 , 19 (6) | National Conference on High Voltage and Discharge Plasmas (HVDP) | IF: 1.07
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Abstract :

After current zero, which is the moment when the vacuum circuit breaker interrupts a vacuum arc, sheath development is the first process in the dielectric recovery process. An axial magnetic field (AMF) is widely used in the vacuum circuit breaker when the high-current vacuum arc is interrupted. Therefore, it is very important to study the influence of different AMF amplitudes on the sheath development. The objective of this paper is to study the influence of different AMF amplitudes on the sheath development from a micro perspective. Thus, the particle in cell-Monte Carlo collisions (PIC-MCC) method was adopted to develop the sheath development model. We compared the simulation results with the experimental results and then validated the simulation. We also obtained the speed of the sheath development and the energy density of the ions under different AMF amplitudes. The results showed that the larger the AMF amplitudes are, the faster the sheath develops and the lower the ion energy density is, meaning the breakdown is correspondingly more difficult.

Keyword :

vacuum circuit breakers sheath PIC-MCC axial magnetic field vacuum arc

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GB/T 7714 Chen, Yi , Yang, Fei , Sun, Hao et al. Influence of the axial magnetic field on sheath development after current zero in a vacuum circuit breaker [C] . 2017 .
MLA Chen, Yi et al. "Influence of the axial magnetic field on sheath development after current zero in a vacuum circuit breaker" . (2017) .
APA Chen, Yi , Yang, Fei , Sun, Hao , Wu, Yi , Niu, Chunping , Rong, Mingzhe . Influence of the axial magnetic field on sheath development after current zero in a vacuum circuit breaker . (2017) .
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