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Summary of Grounding Fault Finding Strategies in Substation DC System [PDF]
, 2023 [Introduction] With the rapid development of power electronic equipment and artificial intelligence and other high-tech, DC (Direct Current) system has been popularized and applied in substations.
Jiantao ZHANG +4 more
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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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Conservation Biology, Volume 36, Issue 4, August 2022., 2022 Abstract As ecological data and associated analyses become more widely available, synthesizing results for effective communication with stakeholders is essential. In the case of wildlife corridors, managers in human‐dominated landscapes need to identify both the locations of corridors and multiple stakeholders for effective oversight.
Jay M. Schoen +13 more
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Multi-parameter fine sensing method of deformation and failure process of coal seam mining floor [PDF]
, 2023 Sensing the floor deformation and damage process by testing parameters during coal seam mining is an effective way to secure the geology of the quarry.
Chang LIU, Duoxi YAO
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柔性直流并入城市电网后对换流站近区短路电流的影响研究 [PDF]
, 2023 大型城市供电电网短路电流已经接近断路器遮断容量，柔性直流接入系统后，会在故障期间提供工作电流，导致交流系统短路电流超标，柔性直流输送功率受限。从柔性直流内外环控制方式及交流系统短路电流计算原理出发，分析得出柔性直流短路电流的幅值和相位对并网点的短路电流影响均较大，其中幅值受外环电流限幅环节的影响易于控制，因此需着重对相位进行控制。基于此提出了一种降低柔性直流输电换流站两端PCC点短路电流的控制策略。以厦门柔性直流工程为例，开发了交直流混合模型，与实测波形对比验证了模型的正确性。通过对不同类型故障下 ...
寇龙泽, 朱琳, 范征, 谷怀广
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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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Dizhen xuebao, 2022 利用传统三极接地电阻率测量方法对井下电极接地电阻进行测量会存在较大的测量误差，表明该方法已不适用于井下电极接地电阻测量。针对此问题，提出了利用台站现有地电阻率仪器进行电极接地电阻测量的新方法—直接测量法，并使用传统三极法和直接测量法对北京平谷地震台井下观测供电电极接地电阻进行了测量。测量结果表明：与传统三极法对比，直接测量法的测量结果更为准确、可靠，而且节省人力、物力和时间。
Yu Zhang, Lanwei Wang, Zhe Hu
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, 2017 本文在总结了前人LED的基础上,利用单片机智能控制的方法研究智能LED的设计和制备,利用色度学三基色配色原理,通过更改三基色LED的电流大小实现整体LED系统的调光和调色,系统可实现亮度20%-100%的调节,实现全彩调节,满足人们的多样化照明需求;同时可通过手机APP利用红外技术实现LED的无线遥控 ...
曹文越
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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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Dianci bileiqi, 2022 配电网小电阻接地方式主要存在供电可靠性低、发生高阻接地故障时选线失灵的问题。本研究将建立小电阻接地模型进行理论分析,并针对目前小电阻接地系统所出现的缺陷,提出一种经动态电阻接地方式。该方式根据三相电压、中性点电压以及各馈线零序电流之间的关系将不同单相接地故障进行分类处理。特别是在解决高阻故障时,通过动态电阻接地方式增加各馈线零序电流进解决小电阻存在的高阻选线缺陷。为验证该接地方式的有效性,在漯河真型试验场进行了现场试验。试验表明动态电阻接地方式在保留小电阻接地方式优点的同时 ...
李必伟 +4 more
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