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学者姓名：刘向军
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Abstract ：
The arc extinguishing system is the main component of the micro circuit breaker, and the structural parameters such as the arc extinguishing grid, the size of the outlet hole, and the contact angle affect the breaking capacity of the micro circuit breaker. In this paper, an arc simulation model is built based on magnetohydrodynamics. On this basis, the transient process of short-circuit current is taken into account to improve the accuracy of the simulation model, and the validity of the model is verified by experiments. Based on the simulation model, the influence of arc extinguishing grid and outlet hole size on the arc extinguishing ability of micro circuit breaker is analyzed by arc shape and external characteristics. The results show that increasing the arc extinguishing grid will make it difficult for the arc to enter the grid, but at the same time, it can increase the arc voltage and promote the extinction of the arc. In terms of the outlet hole, the uneven distribution of the arc when the outlet hole size is 2 mm and 4 mm will cause the arc to blow out from the grid, and the phenomenon of the arc blowing out from the grid can be effectively avoided when the outlet hole size is 3 mm. © Beijing Paike Culture Commu. Co., Ltd. 2024.
Keyword ：
Circuit simulation Circuit simulation Contact angle Contact angle Electric circuit breakers Electric circuit breakers Magnetohydrodynamics Magnetohydrodynamics Timing circuits Timing circuits
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| GB/T 7714 | Li, Xiaodong , Liu, Xiangjun , Xu, Zhihong . Simulation and Research on Short Circuit Breaking Arc Characteristics of Micro Circuit Breaker [C] . 2024 : 32-40 . |
| MLA | Li, Xiaodong 等. "Simulation and Research on Short Circuit Breaking Arc Characteristics of Micro Circuit Breaker" . (2024) : 32-40 . |
| APA | Li, Xiaodong , Liu, Xiangjun , Xu, Zhihong . Simulation and Research on Short Circuit Breaking Arc Characteristics of Micro Circuit Breaker . (2024) : 32-40 . |
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电弧重燃是延长高压直流继电器开断时间的重要原因.为了研究灭弧室内电弧重燃特性,利用Comsol Multiphysics软件仿真获得永磁体磁场,作为电弧仿真的基础条件,仿真分析磁场强度、开断速度、触头形状和气氛压力作用下电弧动态特性及电弧重燃的原因;设计4因素3水平正交试验,并结合仿真研究各因素对电弧重燃的影响程度.结果表明,电弧间隙的散热条件和电弧电压反施加于弧隙的电场强度是电弧重燃的重要原因;散热条件越差或电弧电压反施加的电场强度越高,越容易发生电弧重燃;4个因素对电弧重燃的影响程度依次为开断速度、气氛压力、触头形状和磁场强度.
Keyword ：
正交试验 正交试验 永磁体 永磁体 电弧重燃 电弧重燃 高压直流继电器 高压直流继电器
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| GB/T 7714 | 林臻 , 张鹏 , 刘向军 . 永磁体磁场作用下高压直流继电器电弧重燃的影响因素研究 [J]. | 电器与能效管理技术 , 2024 , (8) : 34-44 . |
| MLA | 林臻 等. "永磁体磁场作用下高压直流继电器电弧重燃的影响因素研究" . | 电器与能效管理技术 8 (2024) : 34-44 . |
| APA | 林臻 , 张鹏 , 刘向军 . 永磁体磁场作用下高压直流继电器电弧重燃的影响因素研究 . | 电器与能效管理技术 , 2024 , (8) , 34-44 . |
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交流接触器的吸持大多通过单一控制线圈电流或电压实现,因此无法兼顾可靠吸持和节能运行的要求,该文对交流接触器不可靠吸持特性进行理论分析、建模仿真和实验测试,得到动、静铁心分离过程中线圈感应电动势的变化规律,并以此为基础,提出一种基于多反馈参量的交流接触器自适应吸持控制策略.以交流接触器正常运行中的触头电流、线圈电流以及不可靠吸持发生时线圈的感应电动势为反馈参量,通过对参量的监测并根据不同的工作状态输出相应的控制信号,使接触器即使处于较低的吸持电压下,依然具备较高的吸持稳定性.基于该策略,设计了控制模块并进行实验验证.结果表明,利用该控制策略可以有效实现接触器的节能运行与可靠吸持,减小吸持能耗并提高交流接触器的工作稳定性.
Keyword ：
交流接触器 交流接触器 多反馈参量 多反馈参量 感应电动势 感应电动势 自适应吸持控制 自适应吸持控制
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| GB/T 7714 | 刘向军 , 杨程 , 周煜源 . 基于多反馈参量的交流接触器自适应吸持控制策略 [J]. | 电工技术学报 , 2023 , 38 (2) : 554-562 . |
| MLA | 刘向军 等. "基于多反馈参量的交流接触器自适应吸持控制策略" . | 电工技术学报 38 . 2 (2023) : 554-562 . |
| APA | 刘向军 , 杨程 , 周煜源 . 基于多反馈参量的交流接触器自适应吸持控制策略 . | 电工技术学报 , 2023 , 38 (2) , 554-562 . |
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本实用新型提供了一种双反力可调开距的智能开关电器，包括电磁机构、触头机构、控制模块、连接机构及底座; 所述电磁机构包括动铁心、静铁心、线圈、第一反力弹簧及第二反力弹簧；所述第一反力弹簧的长度长于所述第二反力弹簧的长度，所述第一反力弹簧的劲度系数小于所述第二反力弹簧的劲度系数；所述触头机构由动触头、静触头和触头弹簧组成；所述动触头与静触头之间为开距。通过第一、第二反力弹簧的压缩，减小铁心的吸合撞击力；分断时，通过第一、第二反力弹簧释放产生大的反力，提高触头分断速度。通过控制模块检测开断电流的大小及开断类型，根据需求调整触头开距大小，实现分断过程的智能控制，达到提高开关电器使用寿命的目的。
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| GB/T 7714 | 刘向军 , 陈伟斌 . 一种双反力可调开距的智能开关电器 : CN202220090090.8[P]. | 2022-01-14 . |
| MLA | 刘向军 等. "一种双反力可调开距的智能开关电器" : CN202220090090.8. | 2022-01-14 . |
| APA | 刘向军 , 陈伟斌 . 一种双反力可调开距的智能开关电器 : CN202220090090.8. | 2022-01-14 . |
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Abstract ：
E型交流接触器常用于频繁接通和分断中小容量交流主电路,电磁系统材料利用率较低且吸合过程触头弹跳剧烈.E型斜极面铁心中柱与边柱斜面角度、方向之间存在着一定关系,若设计不当将导致铁心受到电磁吸力横向分量的影响,使吸合不稳定.建立多物理场耦合仿真模型,采用多策略融合的粒子群算法,从铁心斜面角度、分磁环结构以及节能节材等多因素考虑,对E型斜极面铁心结构的交流接触器电磁系统进行优化设计,根据优化结果制作了样机并进行实验验证.结果表明,优化后的斜极面交流接触器能够达到节能节材,减轻触头弹跳的目的,具有良好的动态特性和经济效益.
Keyword ：
E型交流接触器 E型交流接触器 优化设计 优化设计 斜极面铁心 斜极面铁心 节能节材 节能节材
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| GB/T 7714 | 杨程 , 周煜源 , 刘向军 . E型交流接触器斜极面电磁系统优化 [J]. | 电器与能效管理技术 , 2022 , (12) : 13-19 . |
| MLA | 杨程 等. "E型交流接触器斜极面电磁系统优化" . | 电器与能效管理技术 12 (2022) : 13-19 . |
| APA | 杨程 , 周煜源 , 刘向军 . E型交流接触器斜极面电磁系统优化 . | 电器与能效管理技术 , 2022 , (12) , 13-19 . |
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The severe arc generated between the contacts when the high-voltage DC relay breaks not only affects the breaking reliability, but may even erode the contacts and shorten the life of the relay. In order to study the influence of mechanical characteristics of the electromagnetic mechanism on the arc, this paper proposes a co-simulation technical scheme of the arc and the mechatronics system, where the multi-physics coupling analysis software is used to establish the mechanism model and the arc model respectively, the multibody dynamics software is used to establish the contact collision model, and then based on the Simulink platform the three models are coupled to realize co-simulation. Through the co-simulation of the system, it is convenient to study the electrical characteristics of the arc and subsequently the influence of the structural parameters of the electromagnetic mechanism on the arc characteristics. The system is helpful for designers to improve and optimize the relay product. The technical solution also provides a new idea for the design of various electromagnetic apparatus. © 2022 IEEE.
Keyword ：
Magnetohydrodynamics Magnetohydrodynamics Relay protection Relay protection Simulation platform Simulation platform Simulink Simulink
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| GB/T 7714 | Ji, Kunyu , Liu, Xiangjun . Co-simulation Technology of Arc and Mechatronics System [C] . 2022 . |
| MLA | Ji, Kunyu 等. "Co-simulation Technology of Arc and Mechatronics System" . (2022) . |
| APA | Ji, Kunyu , Liu, Xiangjun . Co-simulation Technology of Arc and Mechatronics System . (2022) . |
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With the development of DC power grid, as a kind of temperature protection of electrical appliances, the organic thermal fuse should be promoted continuously in DC applications to meet market needs. However, if the organic thermal fuse is directly applied in 155VDC/17A occasions, it is usually accompanied by welding, arcing and even open flame combustion, and the thermal fuse will be severely damaged. After the experiment and analysis of DC breaking performance of the existing organic thermal fuse, we found that the contact gap of thermal fuse is small, the breaking speed of the contact is slow, the arc duration is long, and the welding problem is more common. Therefore, optimization measures such as improving the thermal pellet and increasing the stiffness of the trip spring are proposed and verified by experiments. The results show that the arc duration of the improved thermal fuse is greatly reduced and the appearance damage degree is reduced. This research will lay the foundation for the performance optimization design of the organic thermal fuse in the future. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
Keyword ：
Electric power transmission networks Electric power transmission networks Welding Welding
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| GB/T 7714 | Huang, Lijuan , Liu, Xiangjun , Zhao, Davy . Research on DC Breaking Performance of the Organic Thermal Fuse [C] . 2022 : 1140-1148 . |
| MLA | Huang, Lijuan 等. "Research on DC Breaking Performance of the Organic Thermal Fuse" . (2022) : 1140-1148 . |
| APA | Huang, Lijuan , Liu, Xiangjun , Zhao, Davy . Research on DC Breaking Performance of the Organic Thermal Fuse . (2022) : 1140-1148 . |
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The arc generated during the breaking of DC switchgear is the key to determine its breaking performance and electrical life. Because there is no natural zero crossing, it is difficult to extinguish the DC arc. Considering the influence of transverse magnetic field and contact breaking speed on DC arc, the self-designed contact simulation test device based on eddy current repulsion mechanism is used to carry out breaking test under resistive load. The arc waveform is collected by data acquisition system and processed to obtain arc duration and arc energy. At the same time, the arc image is collected by high-speed camera and processed to obtain the arc area. The effects of magnetic field strength and breaking speed on arc duration, arc energy and arc area are studied. The results show that with the increase of magnetic field strength and breaking speed, the arcing duration and arc energy show a power function downward trend. When the magnetic field is large, the arc area does not appear a relatively stable stage, and its growth rate increases with the increase of breaking speed. Adopting appropriate transverse magnetic field and breaking speed can greatly reduce arc duration and arc energy, reduce contact erosion and prolong service life of electrical appliances. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
Keyword ：
Data acquisition Data acquisition High speed cameras High speed cameras Magnetic field effects Magnetic field effects Speed Speed
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| GB/T 7714 | Duan, Jianxu , Liu, Xiangjun . Influence of Transverse Magnetic Field and Breaking Speed of Contact on DC Arc Characteristics [C] . 2022 : 1168-1175 . |
| MLA | Duan, Jianxu 等. "Influence of Transverse Magnetic Field and Breaking Speed of Contact on DC Arc Characteristics" . (2022) : 1168-1175 . |
| APA | Duan, Jianxu , Liu, Xiangjun . Influence of Transverse Magnetic Field and Breaking Speed of Contact on DC Arc Characteristics . (2022) : 1168-1175 . |
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The structures of high-voltage direct current (HVDC) relays are compact. In order to extinguish the arc, the external magnetic field is applied near the contact. HVDC relays with a large capacity are also filled with gas medium to enhance the ability of arc extinguishing. The research on the characteristics of the arc in different gases under different pressures is of great significance to improve the reliability and the lifetime of the HVDC relays. The characteristics of the arc in nitrogen, hydrogen, and nitrogen-hydrogen mixtures and that of the arc root motion in the magnetic field are simulated by means of magnetohydrodynamics (MHD). The arcing processes in N-2 and air are tested by a high-speed camera, and the arc root coordinates are calculated by the image processing method, and the simulation models are verified. The result shows that under the same condition, the hydrogen arc voltage is the highest, and the moving speed of the arc root is the fastest, so that the arc extinguishing performance of the hydrogen is the best. Nitrogen-hydrogen mixture is also a superior arc extinguishing gas, and the higher the proportions of H-2, the better the performance. With the increase of the pressure, arc voltage increases. Except H-2, increasing the pressure of the gas is beneficial for arc motion.
Keyword ：
Arc motion Arc motion Atmospheric modeling Atmospheric modeling gas media gas media high-voltage dc (HVDC) relay high-voltage dc (HVDC) relay HVDC transmission HVDC transmission Magnetic resonance imaging Magnetic resonance imaging magnetohydrodynamics (MHD) magnetohydrodynamics (MHD) Mathematical model Mathematical model Plasmas Plasmas Plasma temperature Plasma temperature Relays Relays
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| GB/T 7714 | Liu, Xiangjun , Huang, Xin , Cao, Qichun . Simulation and Experimental Analysis of DC Arc Characteristics in Different Gas Conditions [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2021 , 49 (3) : 1062-1071 . |
| MLA | Liu, Xiangjun 等. "Simulation and Experimental Analysis of DC Arc Characteristics in Different Gas Conditions" . | IEEE TRANSACTIONS ON PLASMA SCIENCE 49 . 3 (2021) : 1062-1071 . |
| APA | Liu, Xiangjun , Huang, Xin , Cao, Qichun . Simulation and Experimental Analysis of DC Arc Characteristics in Different Gas Conditions . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2021 , 49 (3) , 1062-1071 . |
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针对传统的交流接触器三相触头共用一个电磁系统,无法实现三相电路定相分合闸问题,本文设计了一种异步组合式的交流接触器控制策略,对其动作全过程进行控制.吸合过程采用线圈电流滞环比较控制策略,有效改善了触头弹跳,使机构动作时间更加稳定,提升了定相合闸控制的准确率;在分析了接触器长期工作下线圈电阻增大而引发的不可靠吸持问题,提出了一种基于数控开关电源的自适应吸持电压控制策略,兼顾了可靠吸持和节能运行;分断过程采用基于三相触头电流过零时序的零电流分断控制策略,有效实现了触头电流过零分断.最后进行了实验验证,结果表明,该控制策略可以有效地实现零电压合闸、零电流分断控制,并可根据不同的工况自适应调节线圈保持电压,提高了交流接触器工作的稳定性.
Keyword ：
交流接触器 交流接触器 自适应吸持 自适应吸持 零电压合闸 零电压合闸 零电流分断 零电流分断
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| GB/T 7714 | 周煜源 , 刘向军 . 组合式交流接触器全过程智能控制策略 [J]. | 电气开关 , 2021 , 59 (1) : 39-44,78 . |
| MLA | 周煜源 等. "组合式交流接触器全过程智能控制策略" . | 电气开关 59 . 1 (2021) : 39-44,78 . |
| APA | 周煜源 , 刘向军 . 组合式交流接触器全过程智能控制策略 . | 电气开关 , 2021 , 59 (1) , 39-44,78 . |
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