Results 1 to 10 of about 315 (112)
Research on the Interaction Between Multi-Circuit Shared HVDC Grounding Electrodes [PDF]
, 2023 [Introduction] Unlike the independent grounding electrode, shared earth electrode is connected to multiple DC (Direct Current) systems, and its parameters and operation mode need to be determined by each system connected to it.
Wen WANG, Yu LIU
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Research on Lightning Performance and Protective Measures of ±800 kV UHVDC Power Transmission Line [PDF]
, 2023 [Introduction] Lightning strike is the primary cause of failures of ±800 kV UHVDC power transmission lines, and the lightning protection assessment of power transmission lines is critical to the safe and stable operation of the system.
Youjun GONG, Zhiwen HE, Ziwei YAN
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Research on lightning transient distribution characteristics of cable-stayed bridges [PDF]
, 2023 Bridges are usually located at the junction of land and water, where the surrounding area is open terrain, making them to be easily damaged by lightning strikes.
Dajun XU +4 more
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Mitigation methods and their applicability for DC stray current interference [PDF]
, 2016 Through indoor simulated experimental equipment,mitigation methods which contained the bond resistor method,galvanic anode method and metallic shield method were studied to mitigate DC stray current interference caused by the impressed current cathodic ...
DU Yan-xia, LI Wei, WANG Jie-jun
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Dianci bileiqi, 2023 冬季土壤受冻结作用影响，土壤电阻率明显升高。本研究提出了一种土壤导电模型，搭建了土壤电阻率测量试验平台，依据蒙东地区冬季环境的温度与土壤分层结构调研结果，设计不同含水量的黄土与砂土土壤样本在-20℃的恒温密闭环境内的冻土试验，对比分析不同样本的土壤电阻率随温度的变化情况与规律，将试验结果应用于变电站实例，计算分析土壤电阻率的升高对接地电阻、接触电压和跨步电压的影响规律。
李奕霖 +4 more
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Dianci bileiqi, 2023 为了准确获取特高压直流输电工程接地极极址区域土壤电阻率数据，以某特高压直流接地极为研究对象，分别对极址区域浅层、深层土壤电阻率进行实测，得到极址区域大地土壤电阻率分层数据。同时在极址区域开展模拟注流试验，实测得到极址区域地面电位分布数据，结合实测获得的土壤电阻率分层数据，通过CDEGS软件进行仿真，对土壤电阻率分层结构进行修正，最终获得极址区域土壤电阻率分层结果。该方法可避免由于特高压直流接地极极址区域较大，地形和土壤电阻率分布不均匀等因素造成的直接测量土壤电阻率的误差 ...
刘刚 +6 more
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Soft detection model of corrosion leakage risk based on KNN and random forest algorithms [PDF]
Objective The integrity management of urban gas pipeline networks demands effective risk assessment methods. Corrosion leakage risk assessment necessitates the comprehensive integration of risk assessment factors with various detection operations ...
Chengzhi LI +4 more
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Dianci bileiqi, 2023 山区和坡地的输电线路杆塔周围浅层滑动较为常见，但造成杆塔接地电阻值的变化却容易被忽视。通过测量在不同滑动因素条件下的杆塔接地电阻值和周围土壤电阻率，分析滑动方向、滑动形式、土壤类型、滑动能量等因素对杆塔接地电阻变化造成的影响，探讨浅层滑动对接地电阻的影响机制。测量与分析结果表明：浅层滑动方向出现在杆塔位置下方时，会造成其接地电阻升高；浅层滑动带来的低土壤电阻率的土壤会降低接地电阻，而高土壤电阻率的土壤会提高冲击电阻；浅层滑动土壤形变使得杆塔接地电阻呈现类似于季节性变化；当发生严重的浅层滑动时 ...
岳灵平 +4 more
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Computational model of safe distance between HVAC transmission line and parallel buried pipeline [PDF]
Objective The vigorous development of China's economy has stimulated the development of public energy corridors. Owing to the similar preference in choosing sites for overhead power lines and oil-gas pipelines, these two kinds of corridors frequently ...
Aiwu LIANG +3 more
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Dianci bileiqi, 2021 随着土地资源的紧缺,往往需要在有限的土地资源条件下选取合适的土壤模型并设计相应的符合参数要求的接地网方案。建立了垂直分层的土壤模型,用以模拟在山脚、江（河）两岸等的情况下的土壤电阻率分布。运用CDEGS仿真软件计算接地网的接地电阻、接触电压及跨步电压等参数,通过增设双层地网、增加垂直或倾斜接地体及改变网格密度等方式研究更加优越且经济的接地网优化方案。研究结果表明:对于垂直分层土壤下的接地网,可在低土壤电阻率侧错位的铺设双层接地网;而在高土壤电阻率侧铺设双层接地网对降低接地电阻的作用较小 ...
王继来
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