Results 11 to 20 of about 266,773 (155)
Dianci bileiqi, 2021 接地电阻主要包含接地体本体电阻、土壤电阻以及接地体与土壤之间的接触电阻,但目前接地电阻计算与接地网设计中常常忽略接触电阻的影响。为研究不同材料的接地体与土壤之间接触电阻的影响因素及影响规律,本研究提出了一种研究接地体和土壤接触电阻的测量评估方法,并建立了接地体与土壤接触电阻的试验平台,采用控制变量的实验方法从温度、湿度、土壤类型3个方面研究了接地体与土壤间的接触特性。研究表明:土壤在低温度、低湿度和土壤颗粒较大的环境中,不同材料与土壤的接触电阻都会增大,并且土壤环境变化引起土壤电阻率增大越高 ...
胡松江 +5 more
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Gaoya dianqi, 2022 文中采用三维建模软件Solidworks及有限元软件Ansys对充入干燥空气的柱上开关进行了温度场仿真分析，研究不同接触电阻条件下柱上开关内温度分布规律。仿真结果表明，柱上开关接触点在正常接触电阻条件下温升均符合标准要求；真空灭弧室静触头与动触头接触点接触电阻增大1.56倍，隔离开关动触头与隔离开关静触头接触点接触电阻增大1.80倍，温升达到标准规定的限值。最后，进行了相应的温升试验，温度的仿真结果与试验结果相吻合。
陆德鹏 +4 more
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Gaoya dianqi, 2022 采用机器人技术进行10 kV高压断路器电气试验可克服人工试验存在的问题，有效提高试验效率和质量水平。文中研究了电气试验机器人接线装置（含接线插头和线仓）关键技术，针对最为复杂的回路电阻测试项目，研究并设计了一种集电压与电流接触于一体的弹片式新型接线插头，使得机器人一次接线即可完成回路电阻测试；根据机器人负载能力，研究了插头接触弹片与断路器断口梅花触头触指的接触压力与接触电阻关系，设计了接线插头接触弹片，满足接触电阻的要求。研究并设计了由接线插头定位基座和平面涡簧收放线装置构成的线仓机构 ...
王俊波 +6 more
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基于思维进化和L-M法优化BP神经网络的SF6断路器触头电寿命评估
Gaoya dianqi, 2023 文中分析35 kV SF6断路器一相触头的动态电阻曲线的特点，提取出主触头接触行程、主触头电阻平均值、弧触头接触行程、弧触头电阻平均值和主触头分离时刻动态电阻极大值5个特征参数，分析得到随着烧蚀程度加深，主触头接触行程和弧触头接触行程减小，主触头电阻平均值、弧触头电阻平均值和主触头分离时刻动态电阻极大值增大。提出电寿命指示参数描述触头状态，采用数值表示法，1表示电寿命完好，0表示电寿命完结。以5个特征参数为输入，电寿命指示参数为输出，基于BP神经网络建立电寿命评估模型 ...
马飞越 +7 more
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Gaoya dianqi, 2021 以隔离开关关键零部件触头为研究对象,通过±60℃高低温试验平台,测试了±60℃环境温度下触头表面镀层特性、接触电阻等通流参数,建立数据统计理论模型,定性研究高低温对触头通流能力的影响。建立温度与触头镀银层磨损量和接触电阻的关系曲线,分析了触头镀银层和接触电阻随温度变化情况,研究了接触电阻增大的机理,并以此提出了减小磨损量的相关措施,为提高隔离开关通流能力的提升奠定理论基础。
李宏楼 +13 more
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Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Interface polarization enhancement and impedance matching optimization are the keys to improving the comprehensive performance of microwave absorbing materials (MAMs). Herein, a green synthesis strategy integrating sacrificial template self‐etching, hydrothermal reaction, and annealing treatment is proposed to successfully fabricate urchin ...
Zhenzhen Tian +8 more
wiley +1 more source
In Situ Formation of the Li3Bi Alloy Phase Interface for Robust Garnet Solid‐State Lithium Batteries
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Garnet‐type electrolyte Li6.4La3Zr1.4Ta0.6O12 (LLZTO) is a promising component for commercializing solid‐state batteries owing to its wide electrochemical window, good stability, and high shear modulus. However, poor interface wettability and lithium dendrite growth limit the practical application of the LLZTO electrolyte.
Pengfei You +8 more
wiley +1 more source
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Proton exchange membrane fuel cells (PEMFCs) require advanced bipolar plate coatings to enhance efficiency, durability, and commercialization potential. This review presents a systematic framework for evaluating and designing bipolar plate coatings, integrating material selection, performance metrics, deposition techniques, and future ...
Shijie Li +12 more
wiley +1 more source
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
wiley +1 more source
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Harnessing solar energy for self‐heating presents an effective strategy to suppress surface ice formation. In this paper, we fabricated nano‐silver‐modified multilayer graphene sheets (Ag@MGs) that integrate photothermal and superhydrophobic properties for anti‐icing applications.
Yihan Zhang +7 more
wiley +1 more source