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学者姓名：刘向军
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Abstract ：
为了提高传统电磁式接触器分断电流的能力，并解决大开距下合闸功耗高、动铁心冲击力大、铁心磨损严重等问题，设计一种具有可控开距的接触器。通过结构改进，增大传统交流接触器结构层面可打开开距，利用基于单片机的控制电路识别分断电流，并在分断过程中对励磁线圈施加不同宽度的脉冲电流，使接触器在不同分断电流下具有不同的开距，完成分断后触头回到小开距的平衡位置。通过实验，验证了所设计的接触器具有可控开距的功能。
Keyword ：
分断电流 分断电流 可控开距 可控开距 控制电路 控制电路 电磁接触器 电磁接触器
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| GB/T 7714 | 陈伟斌 , 刘向军 . 具有可控开距接触器的研究 [J]. | 电器与能效管理技术 , 2024 , 6 (03) : 36-41 . |
| MLA | 陈伟斌 等. "具有可控开距接触器的研究" . | 电器与能效管理技术 6 . 03 (2024) : 36-41 . |
| APA | 陈伟斌 , 刘向军 . 具有可控开距接触器的研究 . | 电器与能效管理技术 , 2024 , 6 (03) , 36-41 . |
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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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为解决现有有机物型温度熔断器分断速度缓慢、直流分断能力较低的问题，设计了一种具有快速分断能力的有机物型温度熔断器。通过引入触头驱动件，使其与弹簧动作配合，将热敏药丸缓慢熔化过程转化为动触头快速分断动作，以提高有机物型温度熔断器的直流分断能力，使其适用于直流电路的温度保护。通过多体动力学仿真探究弹簧对动触头的运动速度影响，指导样机参数设计，并制作温度熔断器样机，进行触头分断速度测试以及直流负载分断实验。结果证明，所设计的温度熔断器具有较高的分断速度，具备一定的直流分断能力。
Keyword ：
分断速度 分断速度 弹簧 弹簧 有机物型温度熔断器 有机物型温度熔断器 直流分断性能 直流分断性能 触头驱动件 触头驱动件
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| GB/T 7714 | 潘小宁 , 刘向军 . 快速分断有机物型温度熔断器的设计与实现 [J]. | 电器与能效管理技术 , 2024 , PageCount-页数: 7 (05) : 46-52 . |
| MLA | 潘小宁 等. "快速分断有机物型温度熔断器的设计与实现" . | 电器与能效管理技术 PageCount-页数: 7 . 05 (2024) : 46-52 . |
| APA | 潘小宁 , 刘向军 . 快速分断有机物型温度熔断器的设计与实现 . | 电器与能效管理技术 , 2024 , PageCount-页数: 7 (05) , 46-52 . |
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Abstract ：
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Comso1 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 , PageCount-页数: 11 (08) : 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 PageCount-页数: 11 . 08 (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 , PageCount-页数: 11 (08) , 34-44 . |
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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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With the extensive use of AC contactors, energy consumption has become a problem that cannot be ignored, in which the coil holding energy consumption is the main source. In order to reduce the energy consumption, the reference value of the holding voltage or current must be as low as possible, and the control system should have the adaptive adjustment function to ensure that the effectiveness of the control is not affected by the aging of the AC contactor or the change of the mechanism characteristics. The closed-loop control mode with coil current feedback can effectively avoid the unreliable holding problem caused by temperature rise by controlling the duty cycle of the coil voltage in real time to keep the coil current at a constant value. However, the closed loop control mode usually uses several times of the critical holding current as the reference value, which will cause additional energy consumption and cannot achieve energy-saving operation in real sense. At the same time, the switching electronic devices in the coil excitation circuit need to be on and off constantly, that will bring additional switching losses. Consequently, giving consideration to both reliable holding and energy saving has become the research focus of holding process control. This paper proposes an adaptive holding control strategy based on multiple feedback parameters, which make the contactor have high holding stability even under low holding current. Through theoretical derivation, simulation and experiment, this paper analyzes the change rule of induced electromotive force when unreliable holding event occurs, and draws the conclusion that the generation of induced electromotive force is almost synchronous with the occurrence of unreliable holding events, and the time interval from the occurrence of induced electromotive force to the contacts breaking is more than 10ms. During this period of time, it is sufficient for secondary control of the contactor. The topology control circuit of the contactor coil is designed, which can adaptively adjust the holding voltage by using the numerical control switching power supply to meet the needs of AC contactor starting and adaptive holding in the closed-loop control mode. Taking coil current, contact current and coil induced electromotive force as feedback parameters, an adaptive holding control strategy for AC contactors based on multiple feedback parameters is proposed. Under normal conditions, the contact current and coil current are used as basic feedback parameters to adaptively adjust the holding voltage. If the moving iron core and the static one are separated abnormally, an induced electromotive force of the coil will be generated. When the induced electromotive force reaches a certain threshold, it will be detected by the single chip microcomputer in the control circuit. At this time, the coil is excited strongly by the circuit to make the moving iron core close again to ensure the reliability of the holding. Based on the control strategy, the control module is designed and tested. The results show that the control module can achieve the following functions. ① When the contact current increases, the holding voltage of the coil can change according to the change amplitude of the contact current, indicating that the control strategy can effectively prevent the unreliable holding of the contactor caused by overload. ② When the coil current drops to a certain threshold, the output voltage of the holding power supply rises, ensuring that the AC contactor can still operate reliably when the coil is powered on for a long time or the coil is heated due to the rise of the ambient temperature. ③ In case of aging of the contactor, change of mechanism characteristics, or unreliable holding of the contactor due to external vibration and other emergencies, the multiple feedback parameter adaptive holding control module will conduct secondary control on the coil based on the induced electromotive force, effectively prevent the separation of moving and static contacts, and ensure the normal operation of the main circuit. © 2023 Chinese Machine Press. All rights reserved.
Keyword ：
AC contactor AC contactor adaptive holding control adaptive holding control induced electromotive force induced electromotive force multiple feedback parameters multiple feedback parameters
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| GB/T 7714 | Liu, X. , Yang, C. , Zhou, Y. . Adaptive Holding Control Strategy of AC Contactor Based on Multiple Feedback Parameters; [基于多反馈参量的交流接触器自适应吸持控制策略] [J]. | Transactions of China Electrotechnical Society , 2023 , 38 (2) : 554-562 . |
| MLA | Liu, X. 等. "Adaptive Holding Control Strategy of AC Contactor Based on Multiple Feedback Parameters; [基于多反馈参量的交流接触器自适应吸持控制策略]" . | Transactions of China Electrotechnical Society 38 . 2 (2023) : 554-562 . |
| APA | Liu, X. , Yang, C. , Zhou, Y. . Adaptive Holding Control Strategy of AC Contactor Based on Multiple Feedback Parameters; [基于多反馈参量的交流接触器自适应吸持控制策略] . | Transactions of China Electrotechnical Society , 2023 , 38 (2) , 554-562 . |
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Abstract ：
针对交流接触器起动过程触头弹跳剧烈的问题，采用两段式阶梯电流起动方式，提出一种基于多条件判断的电流斜率闭环反馈控制策略。通过多软件联合仿真模型，结合正交试验计算较佳的起动电流，并仿真验证所提控制策略的可行性。设计控制系统，并进行实验验证。结果表明，所提控制策略可以有效降低触头弹跳，并具有控制可靠性高的特点。
Keyword ：
交流接触器 交流接触器 多条件判断 多条件判断 电流斜率 电流斜率 闭环反馈控制 闭环反馈控制
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| GB/T 7714 | 杨程 , 刘向军 . 基于多条件判断的交流接触器电流斜率闭环反馈控制策略 [J]. | 电器与能效管理技术 , 2022 , 8 (06) : 24-31 . |
| MLA | 杨程 等. "基于多条件判断的交流接触器电流斜率闭环反馈控制策略" . | 电器与能效管理技术 8 . 06 (2022) : 24-31 . |
| APA | 杨程 , 刘向军 . 基于多条件判断的交流接触器电流斜率闭环反馈控制策略 . | 电器与能效管理技术 , 2022 , 8 (06) , 24-31 . |
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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 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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