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学者姓名：兰生
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Abstract ：
Liquid-phase plasma is widely used in industry, so it is important to study its characteristics. In this paper, an experimental system utilizing a cylindrical pressure tank with adjustable hydrostatic pressure for studying liquid-phase pulsed discharge plasma is designed, and the components and experimental principles of the system are introduced in detail. Based on this experimental system, the influence of hydrostatic pressure on the characteristics of liquid-phase plasma was investigated under varying voltage levels and electrode spacings. The results demonstrate that the experimental system can effectively generate and observe liquid-phase plasma. As hydrostatic pressure increases, the pre-breakdown delay at 15 kV and a 2 mm electrode gap increases from 25.6 μs at 0.1 MPa to 447.2μs at 0.5 MPa, while the duration of the main discharge stage decreases from 224.4 to 210.4μs. At 13 kV with a 2 mm electrode gap, the emission spectrum intensity and the electron density of the discharge plasma decrease with increasing hydrostatic pressure. The electron temperature in the plasma channel ranges from 11,000 K to 16,500 K. In addition, the discharge process phenomena were analyzed using typical high-speed camera images, highlighting the characteristics of the discharge plasma at each stage. Finally, the shortcomings and improvement of the experimental system are analyzed. © 2024 Author(s).
Keyword ：
Atomic emission spectroscopy Atomic emission spectroscopy Electrodes Electrodes Electron density measurement Electron density measurement Electron temperature Electron temperature High speed cameras High speed cameras
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| GB/T 7714 | Lan, Sheng , Yao, Longhui , Ding, Xiaoting et al. Influence of hydrostatic pressure on the characteristics of single-pulse discharge plasma in water [J]. | Physics of Plasmas , 2024 , 31 (12) . |
| MLA | Lan, Sheng et al. "Influence of hydrostatic pressure on the characteristics of single-pulse discharge plasma in water" . | Physics of Plasmas 31 . 12 (2024) . |
| APA | Lan, Sheng , Yao, Longhui , Ding, Xiaoting , Wang, Jiaxu , Wang, Jianan , Yuan, Yongbin . Influence of hydrostatic pressure on the characteristics of single-pulse discharge plasma in water . | Physics of Plasmas , 2024 , 31 (12) . |
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This article focuses on the analysis of the influence of different peak values and static water pressure on the electron density of water discharge plasma. A 2D axisymmetric model of pulsed discharge in water is established using COMSOL finite element software. The numerical values of the electron density of the plasma during the pulsed discharge process in water are obtained by solving the fluid diffusion equations coupled with the Poisson equation for spatial electric fields. Simulation results show that increasing the peak value will increase the electron density of the water discharge plasma. In a discharge environment with a static water pressure of 0.1 MPa, when the applied peak value is 10 kV, the peak electron density is 2.31 × 1023 m-3. As the applied peak value gradually increases to 15 kV, the peak electron density reaches 8.91 × 1023 m-3, and the peak appears earlier. On the other hand, increasing the static water pressure will suppress the discharge process and reduce the peak electron density of the water discharge plasma. In a discharge environment with a static water pressure of 0.5 MPa, when the applied peak value is 10 kV, the peak electron density is only 0.38 × 1023 m-3. It is also observed that the ability of static water pressure to suppress the peak electron density of water discharge plasma is higher at lower peak values and lower at higher peak values. For example, in a discharge environment with an applied peak value of 10 kV and a static water pressure of 0.5 MPa, the reduction in peak electron density is 83.55% compared to the same voltage level discharge environment at 0.1 MPa. However, when the applied peak value is 15 kV and the static water pressure is 0.5 MPa, the reduction in peak electron density is only 56.57% compared to the same voltage level discharge environment at 0.1 MPa. IEEE
Keyword ：
Discharge in water Discharge in water Electrodes Electrodes Electron density Electron density Electron density static water pressure Electron density static water pressure Electrons Electrons Finite element analysis Finite element analysis Hydrogen Hydrogen Numerical simulation Numerical simulation Plasma Plasma Plasmas Plasmas Software Software
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| GB/T 7714 | Xiong, L. , Lan, S. , Wang, J. et al. Numerical simulation analysis of discharge in water under different pressures [J]. | IEEE Transactions on Dielectrics and Electrical Insulation , 2024 , 31 (5) : 1-1 . |
| MLA | Xiong, L. et al. "Numerical simulation analysis of discharge in water under different pressures" . | IEEE Transactions on Dielectrics and Electrical Insulation 31 . 5 (2024) : 1-1 . |
| APA | Xiong, L. , Lan, S. , Wang, J. , Ding, X. , Yuan, Y. . Numerical simulation analysis of discharge in water under different pressures . | IEEE Transactions on Dielectrics and Electrical Insulation , 2024 , 31 (5) , 1-1 . |
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Abstract ：
Streamer discharge is a very complex multi-scale and multi-physics coupling process, and there is no accurate model that can describe its development. In this paper, a two-dimensional axisymmetric fluid model is established in COMSOL to simulate and study the effects of the applied voltage amplitude, the discharge gap distance, the rising edge of pulse voltage, and hydrostatic pressure on the development of the positive streamer discharge at a needle-plate electrode in water under a nanosecond pulse voltage. The results show that increasing the voltage amplitude, decreasing the pulse rise time, and narrowing the discharge gap all increase the electric field strength of the streamer, thereby affecting the electron density of the plasma channel, among which changing the discharge gap has the greatest effect on the electron density. And under the gap of 3 mm, the peak electron density can reach 3.76 × 1023 m−3; if the discharge gap is narrowed to 1 mm, the peak electron density is reduced to 1.20 × 1023 m−3. In addition, hydrostatic pressure and water molecule spacing are closely linked. Increasing the hydrostatic pressure decreases the electric field strength and the peak electron density in the plasma channel, and its effect on the peak electron density saturates with increasing hydrostatic pressure. © 2024 Author(s).
Keyword ：
Electric discharges Electric discharges Electron density measurement Electron density measurement Plasma density Plasma density
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| GB/T 7714 | Lan, Sheng , Ding, Xiaoting , Wang, Jiaxu et al. Simulation of the pulsed streamer discharge in water considering the effect of hydrostatic pressure [J]. | Physics of Plasmas , 2024 , 31 (10) . |
| MLA | Lan, Sheng et al. "Simulation of the pulsed streamer discharge in water considering the effect of hydrostatic pressure" . | Physics of Plasmas 31 . 10 (2024) . |
| APA | Lan, Sheng , Ding, Xiaoting , Wang, Jiaxu , Yao, Longhui , Wang, Jianan . Simulation of the pulsed streamer discharge in water considering the effect of hydrostatic pressure . | Physics of Plasmas , 2024 , 31 (10) . |
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Abstract ：
This article focuses on the analysis of the influence of different peak values and static water pressure on the electron density of water discharge plasma. A 2-D axisymmetric model of pulsed discharge in water is established using COMSOL finite element software. The numerical values of the electron density of the plasma during the pulsed discharge process in water are obtained by solving the fluid diffusion equations coupled with the Poisson equation for spatial electric fields. Simulation results show that increasing the peak value will increase the electron density of the water discharge plasma. In a discharge environment with a static water pressure of 0.1 MPa, when the applied peak value is 10 kV, the peak electron density is 2.31 x 10 (23) m(-3). As the applied peak value gradually increases to 15 kV, the peak electron density reaches 8.91 x 10(23) m(-3), and the peak appears earlier. On the other hand, increasing the static water pressure will suppress the discharge process and reduce the peak electron density of the water discharge plasma. In a discharge environment with a static water pressure of 0.5 MPa, when the applied peak value is 10 kV, the peak electron density is only 0.38 x 10 (23) m(-3) . It is also observed that the ability of static water pressure to suppress the peak electron density of water discharge plasma is higher at lower peak values and lower at higher peak values. For example, in a discharge environment with an applied peak value of 10 kV and a static water pressure of 0.5 MPa, the reduction in peak electron density is 83.55% compared to the same voltage level discharge environment at 0.1 MPa. However, when the applied peak value is 15 kV and the static water pressure is 0.5 MPa, the reduction in peak electron density is only 56.57% compared to the same voltage level discharge environment at 0.1 MPa.
Keyword ：
Discharge in water Discharge in water Electrodes Electrodes electron density electron density electron density static water pressure electron density static water pressure Electrons Electrons Finite element analysis Finite element analysis Hydrogen Hydrogen numerical simulation numerical simulation Numerical simulation Numerical simulation plasma plasma Plasmas Plasmas Software Software
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| GB/T 7714 | Xiong, Likai , Lan, Sheng , Wang, Jiaxu et al. Numerical Simulation Analysis of Discharge in Water Under Different Pressures [J]. | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2024 , 31 (5) : 2461-2468 . |
| MLA | Xiong, Likai et al. "Numerical Simulation Analysis of Discharge in Water Under Different Pressures" . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 31 . 5 (2024) : 2461-2468 . |
| APA | Xiong, Likai , Lan, Sheng , Wang, Jiaxu , Ding, Xiaoting , Yuan, Yongbin . Numerical Simulation Analysis of Discharge in Water Under Different Pressures . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2024 , 31 (5) , 2461-2468 . |
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Abstract ：
传统配电网在大量分布式电源接入后变为有源配电网，拓扑结构与故障特征发生改变，现有电流差动保护无法同时满足可靠性与灵敏性要求。为此分析了逆变型分布式电源故障输出特性，建立有源配电网正序电流故障分量网络，在此基础上提出一种基于正序电流故障分量的电流差动保护方案。该方案以线路两侧正序电流故障分量为特征量对常规电流差动保护进行改造，解决了在分布式电源接入后线路发生区内高过渡电阻故障引起的电流差动保护无法准确识别故障的问题。最后使用PSCAD/EMTDC对该方案在不同工况下的动作情况进行仿真，仿真结果表明该方案能够适应有源配电网保护需求。
Keyword ：
差动保护 差动保护 故障分量 故障分量 有源配电网 有源配电网 正序电流 正序电流
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| GB/T 7714 | 鲁坤 , 兰生 , 贺清峰 et al. 基于正序电流故障分量的有源配电网线路差动保护 [J]. | 电气开关 , 2024 , 62 (02) : 43-47 . |
| MLA | 鲁坤 et al. "基于正序电流故障分量的有源配电网线路差动保护" . | 电气开关 62 . 02 (2024) : 43-47 . |
| APA | 鲁坤 , 兰生 , 贺清峰 , 康健 . 基于正序电流故障分量的有源配电网线路差动保护 . | 电气开关 , 2024 , 62 (02) , 43-47 . |
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Abstract ：
Streamer discharge is a very complex multi-scale and multi-physics coupling process, and there is no accurate model that can describe its development. In this paper, a two-dimensional axisymmetric fluid model is established in COMSOL to simulate and study the effects of the applied voltage amplitude, the discharge gap distance, the rising edge of pulse voltage, and hydrostatic pressure on the development of the positive streamer discharge at a needle-plate electrode in water under a nanosecond pulse voltage. The results show that increasing the voltage amplitude, decreasing the pulse rise time, and narrowing the discharge gap all increase the electric field strength of the streamer, thereby affecting the electron density of the plasma channel, among which changing the discharge gap has the greatest effect on the electron density. And under the gap of 3 mm, the peak electron density can reach 3.76 x 10(23) m(-3); if the discharge gap is narrowed to 1 mm, the peak electron density is reduced to 1.20 x 10(23) m(-3). In addition, hydrostatic pressure and water molecule spacing are closely linked. Increasing the hydrostatic pressure decreases the electric field strength and the peak electron density in the plasma channel, and its effect on the peak electron density saturates with increasing hydrostatic pressure.
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| GB/T 7714 | Lan, Sheng , Ding, Xiaoting , Wang, Jiaxu et al. Simulation of the pulsed streamer discharge in water considering the effect of hydrostatic pressure [J]. | PHYSICS OF PLASMAS , 2024 , 31 (10) . |
| MLA | Lan, Sheng et al. "Simulation of the pulsed streamer discharge in water considering the effect of hydrostatic pressure" . | PHYSICS OF PLASMAS 31 . 10 (2024) . |
| APA | Lan, Sheng , Ding, Xiaoting , Wang, Jiaxu , Yao, Longhui , Wang, Jianan . Simulation of the pulsed streamer discharge in water considering the effect of hydrostatic pressure . | PHYSICS OF PLASMAS , 2024 , 31 (10) . |
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Abstract ：
建立了针-针钨电极在脉冲电压作用下击穿放电的流体数学模型，利用COMSOL软件仿真水中脉冲放电过程，研究了不同放电条件下钨电极击穿过程中流注的形貌发展、带电粒子的密度和流柱的迁移速度。仿真结果表明：在针-针电极间距为3mm,脉冲电压幅值为11～15kV时，电子密度最大值均在10~(23)·m~(-3)数量级上，随着电压幅值的增大，等离子体中的电子密度峰值也会增大，且流注的发展速度加快；增大钨电极的电极间隙时，流柱发展所用时间变长，但流柱的发展速度也会变快。通过实验中光谱仪的测量数据计算得到的电子密度也处于10~(23)·m~(-3)数量级上，验证了仿真结果的合理性。电子密度的大小会影响放电通道中温度、电场强度和自由基反应速率等物理量，所以电子密度的数值计算有着重要意义。
Keyword ：
数学模型 数学模型 水中脉冲放电 水中脉冲放电 流注 流注 电子密度 电子密度
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| GB/T 7714 | 冯志远 , 兰生 , 熊立凯 . 钨电极的水中脉冲放电过程数值计算研究 [J]. | 电气开关 , 2024 , 62 (03) : 21-26 . |
| MLA | 冯志远 et al. "钨电极的水中脉冲放电过程数值计算研究" . | 电气开关 62 . 03 (2024) : 21-26 . |
| APA | 冯志远 , 兰生 , 熊立凯 . 钨电极的水中脉冲放电过程数值计算研究 . | 电气开关 , 2024 , 62 (03) , 21-26 . |
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Abstract ：
电力变压器发生短路故障时会产生巨大的电动力，为研究电力变压器短路故障时的绕组变形情况以及影响绕组变形的因素，文中基于变压器多物理场耦合理论，搭建了三相变压器的有限元模型，通过MATLAB/Simulink平台仿真变压器发生短路时的短路电流，将该电流作为电磁场仿真的激励，计算出绕组的漏磁场和电动力分布，再采用电磁-结构场耦合的方法分析绕组的形变量大小和应力分布；运用相关理论分析不同温度条件对绕组变形的影响。结果表明，在辐向上，高压绕组受到向外膨胀的辐向电动力，中压和低压绕组受到向中间压缩的辐向电动力，在轴向上，各绕组均受到从端部向中间压缩的电动力，温度越高，绕组铜的杨氏模量越小，相同电动力作用下绕组变形量越大。研究结果对提高变压器抗短路能力具有一定的参考意义。
Keyword ：
多物理场耦合 多物理场耦合 有限元法 有限元法 温度 温度 电力变压器 电力变压器 短路电流 短路电流
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| GB/T 7714 | 贺清锋 , 兰生 . 电磁-结构场耦合下变压器绕组漏磁场和变形仿真研究 [J]. | 变压器 , 2024 , 61 (05) : 51-57 . |
| MLA | 贺清锋 et al. "电磁-结构场耦合下变压器绕组漏磁场和变形仿真研究" . | 变压器 61 . 05 (2024) : 51-57 . |
| APA | 贺清锋 , 兰生 . 电磁-结构场耦合下变压器绕组漏磁场和变形仿真研究 . | 变压器 , 2024 , 61 (05) , 51-57 . |
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Abstract ：
Liquid-phase plasma is widely used in industry, so it is important to study its characteristics. In this paper, an experimental system utilizing a cylindrical pressure tank with adjustable hydrostatic pressure for studying liquid-phase pulsed discharge plasma is designed, and the components and experimental principles of the system are introduced in detail. Based on this experimental system, the influence of hydrostatic pressure on the characteristics of liquid-phase plasma was investigated under varying voltage levels and electrode spacings. The results demonstrate that the experimental system can effectively generate and observe liquid-phase plasma. As hydrostatic pressure increases, the pre-breakdown delay at 15 kV and a 2 mm electrode gap increases from 25.6 mu s at 0.1 MPa to 447.2 mu s at 0.5 MPa, while the duration of the main discharge stage decreases from 224.4 to 210.4 mu s. At 13 kV with a 2 mm electrode gap, the emission spectrum intensity and the electron density of the discharge plasma decrease with increasing hydrostatic pressure. The electron temperature in the plasma channel ranges from 11,000 K to 16,500 K. In addition, the discharge process phenomena were analyzed using typical high-speed camera images, highlighting the characteristics of the discharge plasma at each stage. Finally, the shortcomings and improvement of the experimental system are analyzed.
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| GB/T 7714 | Lan, Sheng , Yao, Longhui , Ding, Xiaoting et al. Influence of hydrostatic pressure on the characteristics of single-pulse discharge plasma in water [J]. | PHYSICS OF PLASMAS , 2024 , 31 (12) . |
| MLA | Lan, Sheng et al. "Influence of hydrostatic pressure on the characteristics of single-pulse discharge plasma in water" . | PHYSICS OF PLASMAS 31 . 12 (2024) . |
| APA | Lan, Sheng , Yao, Longhui , Ding, Xiaoting , Wang, Jiaxu , Wang, Jianan , Yuan, Yongbin . Influence of hydrostatic pressure on the characteristics of single-pulse discharge plasma in water . | PHYSICS OF PLASMAS , 2024 , 31 (12) . |
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Abstract ：
针对电容器组三相不平衡保护存在使用范围有限和无法识别对称故障的问题，提出一种电容器组故障的分布式技术保护方法。电容器组某台电容器内部发生短路故障后，若不及时切除，易发生外壳爆裂事故。本文研究利用短路故障发生时的电流暂态峰值与电容器标准中的整定值进行比较，实现各台电容器的分布式保护。本文研究过程中利用PSCAD/EMTDC软件，搭建了18台电容器组模型（单台电容器4串13并结构），对电容器内部元件发生短路故障的状态进行模拟仿真。研究结果表明，电容器内部一个或多个元件故障时，其故障电流峰值基本相同，且投切时系统最大峰值电流小于故障电流峰值，故障电流峰值对电容器组的分布式保护整定值提供了重要参考依据。
Keyword ：
不平衡保护 不平衡保护 分布式保护 分布式保护 电容器组 电容器组 短路故障 短路故障
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| GB/T 7714 | 黄云程 , 沈谢林 , 张国灿 et al. 电容器组故障的分布式电流保护方法研究 [J]. | 电力电容器与无功补偿 , 2023 , 44 (03) : 1-7 . |
| MLA | 黄云程 et al. "电容器组故障的分布式电流保护方法研究" . | 电力电容器与无功补偿 44 . 03 (2023) : 1-7 . |
| APA | 黄云程 , 沈谢林 , 张国灿 , 庄奕挺 , 林燕强 , 彭炜文 et al. 电容器组故障的分布式电流保护方法研究 . | 电力电容器与无功补偿 , 2023 , 44 (03) , 1-7 . |
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