Results 1 to 10 of about 1,161,463 (166)
Dianci bileiqi, 2015 喀斯特地形地貌的特点为地质条件差,土壤电阻率高,基本在1 00010 000Ω·m之间,使得防雷接地系统的设计与施工存在很多难题。本文以创造"四个世界第一"的矮寨大桥为例,通过分析大桥所在地的雷电活动情况和地质特性,对跨峡谷特大悬索桥的综合防雷接地系统的设计与施工进行了论述和分析,并对大桥的接地电阻进行了理论估算。研究表明:喀斯特地貌条件下,防雷接地系统应充分利用自然接地体,并根据地形特点进行人工地网的补充设计与施工,同时考虑采用降阻剂、接地模块、离子接地极等材料以降低接地电阻值 ...
周国军 +8 more
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Gaoya dianqi, 2010 35 kV系统中铁磁谐振过电压频繁发生,对系统造成很大的危害。利用理论分析和EMTP-RV仿真相结合的方法,分析了中国35 kV系统3种中性点接地方式（中性点不接地、经消弧线圈或小电阻接地）下由电磁式电压互感器（PT）饱和引起的铁磁谐振过电压,研究结果表明,在中性点经消弧线圈或小电阻接地系统中,只要消弧线圈或小电阻的参数选取合适,能够将中性点位移电压限制在电压三角形内,可有效抑制铁磁谐振的发生。
汪伟 +6 more
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Gaoya dianqi高压电缆金属护套接地系统对电缆安全运行至关重要，同时故障占比较高。金属护套接地电流的监测结果能够反映电缆金属护套接地系统健康状态，是评价高压电缆线路运行状态的重要依据。解释了金属护套环流的形成机理，介绍了金属护套接地系统的常见缺陷，对国内外应用金属护套电流诊断金属护套接地系统缺陷的判据进行了全面梳理，并通过现场案例比较了现行判据的效果，为进一步提出更准确和全面的诊断判据提供参考。
赵洋 +5 more
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Gaoya dianqi, 1992 【问】什么是异相接地故障?电力部门为什么要求在非有效接地系统中应选用通过异相接地故障开断试验的断路器? 【答】在中性点非有效接地系统中,在一相断路器的内侧和另一相断路器的外侧各产生一个单相接地的故障,称为异相接地故障。异相接地故障实际是一种特定的两相接地故障。在开断异相接地时,断路器首开相上将出现1.73倍相电压工频过电压 ...
林立生
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[Joint trajectories and evolution patterns of direct and indirect maternal mortality across 204 countries from 2000 to 2021]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanZhou Y, Cheng Z, Feng X.
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[Design and implementation of the internet of medical things data platform based on cloud-edge-end architecture]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiLiang H +10 more
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[Status and influencing factors of transition preparation in adolescents with thalassemia major]. [PDF]
Zhongguo Dang Dai Er Ke Za ZhiHuang XP +5 more
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[Gait event-driven dynamic changes in brain-muscle networks and neuromuscular coordination mechanisms]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiLiu X, Guo A, Liang T, Liu X, Qin L.
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[Epidemiological characteristics of intussusception in children aged 0-3 years in Jiangsu Province from 2018 to 2023]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanWang Y, Gao X, Liu Z, Zhan S.
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[Differences in the formation mechanism of performance-based compensation in public hospitals with different administrative affiliations]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanZhang Y +5 more
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