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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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Abstract ：
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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Abstract ：
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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Abstract ：
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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Abstract ：
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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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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Abstract ：
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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Abstract ：
本实用新型提出一种基于电磁保持装置的快速开关，包括：动静触头、涡流斥力机构、电磁保持装置和控制单元；动触头与所述涡流斥力机构和电磁保持装置通过导杆依次连接；所述电磁保持装置用于在不通电时提供永磁吸力，通电时抵消永磁吸力；所述涡流斥力机构用于在通电时产生斥力推动动触头进行分闸或合闸；所述控制单元分别连接涡流斥力机构和电磁保持装置，用于控制其通断电。可通过控制单元灵活调节保持线圈电流的大小来调节保持力，防止涡流斥力机构因分合闸末期斥力盘冲力过大而造成的回弹，在分合闸状态转换时由于提前对上一状态的保持线圈通以一定方向的脉冲电流，抵消永磁体的作用力，使开关的初始运动速度不受保持力的影响。
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| GB/T 7714 | 刘向军 , 段建旭 . 基于电磁保持装置的快速开关 : CN202121631468.2[P]. | 2021-07-19 . |
| MLA | 刘向军 等. "基于电磁保持装置的快速开关" : CN202121631468.2. | 2021-07-19 . |
| APA | 刘向军 , 段建旭 . 基于电磁保持装置的快速开关 : CN202121631468.2. | 2021-07-19 . |
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Abstract ：
to high voltage and current levels of high voltage DC (HVDC) relays and the absence of natural zero crossings in DC system, the arc generated during the breaking process of the relay has high energy and is difficult to extinguish, which affects the relay's breaking reliability and electrical life. In order to accelerate arc extinguishing, the permanent magnets are usually placed in the arc extinguishing chamber of the HVDC relay. The existing simulation analysis is mostly based on the uniform distribution of the magnetic field, while the distribution of the magnetic field generated by the permanent magnets is non-uniform. Therefore, based on the theory of magnetohydrodynamics (MHD), this paper establishes the numerical model of arc plasma and permanent magnets of HVDC relay by means of COMSOL Multiphysics software, analyzes the arc motion characteristics under the action of non-uniform magnetic field generated by permanent magnet. The results of the simulation analysis will provide a basis for the application of permanent magnets in HVDC relays. © 2021 IEEE.
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| GB/T 7714 | Lin, Qiong , Huang, Xin , Liu, Xiangjun . Simulation Analysis of Arc Motion of High Voltage DC Relay under Non-uniform Magnetic Field [C] . 2021 . |
| MLA | Lin, Qiong 等. "Simulation Analysis of Arc Motion of High Voltage DC Relay under Non-uniform Magnetic Field" . (2021) . |
| APA | Lin, Qiong , Huang, Xin , Liu, Xiangjun . Simulation Analysis of Arc Motion of High Voltage DC Relay under Non-uniform Magnetic Field . (2021) . |
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Abstract ：
小型拍合式功率继电器在开断交流负载的过程中会产生高能量的电弧而烧蚀触头,同时因簧片振动,电弧时常跑出触头进而烧蚀簧片,严重影响继电器的电寿命和可靠性.为了研究簧片振动对电弧运动过程的影响,为拍合式继电器结构优化设计提供基础,提出一种基于高速摄像技术的测试方法,对动静簧片和电弧进行同步图像测试,通过图像处理得到运动关系曲线.采用控制变量法改变动簧片和静簧片的刚度,分析影响电弧运动的关键因素.结果表明,减弱簧片的振动有利于减小电弧的运动范围,使电弧相对稳定在触头表面.
Keyword ：
交流电弧 交流电弧 小型拍合式功率继电器 小型拍合式功率继电器 簧片 簧片 高速摄像机 高速摄像机
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| GB/T 7714 | 张星 , 刘向军 . 拍合式继电器簧片和电弧运动关系 测试与分析 [J]. | 电器与能效管理技术 , 2020 , (2) : 1-7 . |
| MLA | 张星 等. "拍合式继电器簧片和电弧运动关系 测试与分析" . | 电器与能效管理技术 2 (2020) : 1-7 . |
| APA | 张星 , 刘向军 . 拍合式继电器簧片和电弧运动关系 测试与分析 . | 电器与能效管理技术 , 2020 , (2) , 1-7 . |
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