Results 31 to 40 of about 7,781 (128)
Gaoya dianqi, 2017 直流断路器的故障切除时间主要决定于关键元件超快速隔离开关的动作时间。文中对超快速隔离开关的电磁斥力机构工作原理进行研究,得到建立电磁斥力机构的有限元模型。仿真分析线圈参数、金属盘尺寸等因素对超快速隔离开关动态特性的影响,在此基础上对电磁斥力机构参数进行优化。最后对设计超快速隔离开关进行动态特性测试,测试结果表明设计的电磁斥力机构能满足超快速隔离开关2 ms运动到耐受故障切除过程中的暂态开断电压TIV的绝缘距离要求,验证了设计的有效性,为混合式高压直流断路器的实现提供了保证。
吴文耿 +7 more
doaj
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT With the rapid development of the energy storage industry, aqueous zinc‐ion batteries (AZIBs) have attracted considerable attention in the field of energy storage because of their inherent advantages, thereby emerging as a promising research direction with significant potential.
Lingjiao Fu +8 more
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT The transformative potential of gallium nitride high electron mobility transistors (GaN HEMTs) in advancing carbon‐neutral power systems remains bottlenecked by contact resistance (Rc) at the metal–semiconductor (M‐S) interface, a critical determinant of switching losses and frequency response.
Ji‐Zhou Zhang +8 more
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Gaoya dianqi, 2016 基于电磁斥力原理的快速开关具有操作机构简单,分闸速度快等优点,在混合型直流断路器以及故障限流器等场合起关键作用。文中通过三维有限元仿真与试验验证,对影响电磁斥力机构出力特性的多个参数进行了分析。并且在样机研制和测试过程中,重点分析了快速开关分闸弹跳过大并容易导致分闸失败的原因,推导了分闸弹跳物理过程中各参数的数学关系。测试结果表明,其9 mm满行程时间为2.9 ms,分闸反弹不超过2 mm。最后在总结15 kV中压快速开关研究的基础上,提出了高压快速开关的研究方向和重点。
杨浩 +6 more
doaj
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Early detection of thermal runaway (TR) is essential for lithium‐ion battery (LIB) safety, as unchecked TR risks catastrophic failures in energy storage systems. Gas‐based sensing offers a faster and more direct approach by detecting decomposition products at the molecular level.
Tianshui Liang +9 more
wiley +1 more source
Gaoya dianqi, 2003 对高压快速转换开关进行了研究,并开发出一台单相试品。该开关由6 kV/400 A真空接触器灭弧室、双向电磁推力操动机构和双稳碟簧机构组成。试验表明,该快速开关的分闸时间为0.8 ms,合闸时间为2.3 ms。
李庆民 +3 more
doaj
基于多策略粒子群算法的500 kV直流断路器用快速机械开关优化设计
Gaoya dianqi, 2022 快速机械开关作为混合式直流断路器系统的关键设备,其操动机构多选用电磁斥力机构,电磁斥力机构的磁场电场相互耦合,仅通过控制变量法难以从整体上对电磁斥力机构进行优化设计。为此,提出一种多策略改进粒子群算法,并将其应用到斥力机构的参数优化中。首先,利用Ansoft Maxwell仿真分析了电磁斥力机构的线圈盘尺寸、金属盘尺寸和放电回路参数对快速机械开关动态性能的影响,确定了主要的优化设计参数;其次,针对基本粒子群的缺陷,结合重开端及反向学习策略进行改进并验证了改进后算法的优势性;最后 ...
方春恩 +5 more
doaj
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Dielectric ceramics are popular for energy storage materials because of their rapid charge–discharge characteristics, whereas their low energy density and efficiency hinder their miniaturization and integration. In this work, the energy storage performance is significantly enhanced through introducing Al2O3 and TiO2 into the 0.425(Bi0.5Na0.5 ...
Qiansi Zhang +9 more
wiley +1 more source
Gaoya dianqi, 2015 由于气体绝缘变电站（GIS）隔离开关操作而产生的快速暂态过电压（very fast transient overvoltage,VFTO）,具有高频率、上升时间短、高幅值等特点,对GIS本体及相邻设备有较大危害。文中在隔离开关测量系统的基础上,研究了变压器耦合电容和隔离开关分合闸速度对VFTO和快速暂态电流（very fast transient current,VFTC）的影响。当变压器耦合电容分别取300、800、1 100 p F时,试验结果得出VFTO和VFTC的幅值会随着耦合电容的升高而增大 ...
赵承楠 +4 more
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World Water Policy, Volume 12, Issue 1, February 2026.ABSTRACT Urban expansion significantly impacts flood risk, particularly in rapidly growing areas where impervious surfaces exacerbate surface runoff. This study examines spatial patterns of urban growth and their effects on flood exposure in Mecklenburg County, North Carolina, from 2011 to 2021.
Pegah Madadi, Azad Sadeghi
wiley +1 more source