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tentative standard暂行标准term条,项,期,限,术语terminal block接线板,端子板terminal box端子箱terminal eye心形环terminal insulation端子绝缘terminal insulator端子绝缘子terminal plate接线板,终端片terminal pole终端杆terminal voltage终端电压,端子电压terminal端子,接线柱,终点,终端termination pole锚柱terrain formation地形terrestrial survey地面勘测tertiary coil第三绕组test试验,测试test bus bar试验母线test load试验负载,试验负荷test operation试运行test standard测试标准testing voltage试验电压thermal热thermal … 相似文献
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Li H.-Q.Fan C.-L. 《铁道工程学报》2014,(9):93-96
Research purposes: Lightning has been one of the important factors endangering safe and reliable operation of the railway. The grounding grid performance plays a particularly important role in lightning protection. In this paper, the author has established a grounding grid transient model by the electromagnetic transient analysis software and intended for quantitative analysis of typically grounding grid layout in engineering practice, to lay important theoretical basis for future lightning protection and grounding. Research conclusions: (1) The results show that the ground potential is significantly affected by the soil resistivity, lightning current amplitude and the mesh size. With increase of the soil resistivity and lightning current amplitude, the ground potential at the point of the lightning current injection will significantly improve, but due to the spark discharge of the soil. The ground potential does not increase exponentially with potential lightning current amplitude. The smaller the mesh size, the better the ground potential attenuation. For example of the lightning current 20 kA and the soil resistivity 100 Ω·m, the ground potential of the 5 m×5 m mesh decreases 22.3% compared with the 10 m×10 m mesh. (2) The study finds that the ground potential attenuation away from the lightning strike point at 15 m basically reaches the maximum, which is about 89%. And the degree of attenuation is independent of lightning current amplitude. (3) The results are mainly used for optimization program and design fields on substation lightning protection and grounding. 相似文献
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为研究钢纤维混凝土(SFRC)栓钉-橡胶连接件的力学性能,采用ABAQUS软件对其进行非线性有限元计算,比较分析不同橡胶套高度下SFRC栓钉-橡胶连接件与SFRC普通栓钉连接件抗剪承载力、抗剪刚度等力学性能差异。研究结果表明,采用ABAQUS/standard求解器能较好地模拟SFRC栓钉-橡胶连接件推出试验;采用橡胶包裹栓钉后,连接件抗剪承载力基本保持不变,抗剪刚度显著减小(约为SFRC普通栓钉连接件的50%);橡胶套高度变化(hr=25,50,75 mm)对其抗剪刚度与抗剪承载力影响较小;组合连接件橡胶套高度建议取栓钉高度的50%。 相似文献
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介绍了美国联邦政府通过立法发布的《公共交通安全标准纲要》。该纲要定义了城市轨道交通模式及其安全标准。城市轨道交通安全标准分为车辆、基础设施、运营和人员等标准,共128项,以技术对象层次分为类、子类和子功能类等3层。标准类型分为法规、标准和规范。线路、通信信号、车辆设备和运营规章程序标准是安全标准的主体。解析了采用标准的法规,举例说明了安全法规采用标准。我国城市轨道交通当务之急是研究建立安全标准体系。 相似文献