Results 11 to 20 of about 4,177 (129)
Dianci bileiqi, 2022 为深入研究不同形状接地体的冲击特性差异，指导输电线路杆塔的接地设计，笔者分别对圆环形接地体与人字形接地体进行研究。先利用CDEGS软件，对二者进行建模仿真，通过正反傅里叶变换，得到其各自的时频域冲击特性响应，再进行量化比较。结果表明：当土壤电阻率为200Ω·m时，圆环形接地体的冲击接地电阻、地电位升高、跨步电压均高于相同周长下人字形接地体；而当土壤电阻率为1 200Ω·m时，圆环形接地体的冲击接地电阻、地电位升高、跨步电压均低于相同周长下人字形接地体。当入地电流频率低于10 kHz时 ...
石发科 +5 more
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Design of low-voltage electronically tunable current-mode multiphase sinusoidal oscillator based on single CDCTA [PDF]
, 2015 A novel current-mode multiphase sinusoidal oscillator circuit was proposed.The realized circuit using single current differencing cascaded transconductance amplifier(CDCTA)and only grounded passive elements could yield n(n being odd or even)current ...
Chun-hua WANG +4 more
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Data analysis before and after the transformation of Yuanmou Julin geoelectric field [PDF]
Taking the geoelectric field observation data of Yuanmou Julin of Chuxiong Earthquake Monitoring Center Station as the research object, combined with the ideas and specific contents of the two transformations since the geoelectric field observation，the ...
Jianming Shi +4 more
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Evaluation of the Caoping electric field observation system in Lixian County, Gansu Province [PDF]
In this paper, we briefly conducted an observation overview of the Caoping electric field in Lixian County, collected observation data for graphical analysis, and compared and measured the parameters of observation quality (correlation coefficient and ...
Donglin Mei +4 more
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Dianci bileiqi, 2021 从原理上分析了消弧线圈并电阻接地方式,并采用MATLAB软件进行仿真,得到消弧线圈并小电阻接地方式仅能处理过渡电阻为125Ω的接地故障;消弧线圈并中电阻接地方式在对称电网中的接地电阻识别能力可达2 000Ω,但在电网极不对称的情况下最多能识别800Ω的接地电阻。在此基础上,提出了基于阻性分量提取法的动态接地方式,它通过突变量启动法触发选线装置,运用阻性分量提取法判定故障线路,在高阻接地故障下仍能准确选线。漯河10 kV真型试验场进行的试验表明,动态接地方式能可靠处理3 500Ω的高阻接地故障 ...
刘洋, 李景禄, 朱文葛, 李必伟
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Application of Comprehensive Electromagnetic Methods in the Search for Copper-Nickel Polymetallic Ores in Shallow-Covered Areas: A Case Study of The Jing'erquan Area in the East Tianshan Mountains of Xinjiang [PDF]
The Jing'erquan area in the East Tianshan Mountains of Xinjiang is characterized by shallow coverage, posing challenges to surface geological exploration for ore bodies.
Hongyu GUO +4 more
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Dianci bileiqi, 2019 准确模拟接地网周围土壤结构对接地装置优化设计具有重要意义。基于有限元算法,建立了考虑异阻区的土壤结构模型,对接地网散流过程中地中电流密度进行分析;并对异阻区土壤电阻率、截面积、厚度、位置等参数对接地网接地电阻的影响规律进行了定量分析。结果表明:异阻区截面积不大于10 m×10 m时,可以忽略异阻区对接地网接地电阻的影响,否则应考虑其对接地电阻的影响;异阻区土壤电阻率越小、厚度越大,其对接地电阻的影响越大,异阻区土壤电阻率ρ=10Ω·m,厚度h=1 m时,接地电阻下降幅度为36 ...
刘保纲 +4 more
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, 2019 在现代建筑工程中，电气施工中的接地系统至关重要，其保障了整个电气系统的功能性和稳定性，关乎人的生命安全和经济财产安全。本文简要论述了接地和等电位联结的特点和关系，认为应认识到建筑电气设计中等电位联结的重要性，而不必要求人工接地极的接地电阻。
西亚 马
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, 2019 “电气设备”是电力系统中电动机、高低压柜、配电箱、断路器等用电设备的总称，将设备用导线、电缆等接地装置与大地连接在一起成为“接地”。电气设备接地有时是功能需要，有时是保护需要。所以其对设备正常运行、人员人身安全来说十分重要。本文主要探讨了与电气设备接地相关的接地系统、接地类型、接地电阻、接地体截面积等技术内容，并以烟气脱硫脱硝项目为例加以说明，以供大家参考。
乘康 赵
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