Results 91 to 100 of about 1,397 (188)
Calculating current and temperature fields of HVDC grounding electrodes
Journal of Modern Power Systems and Clean Energy, 2016 Current field calculation based on the resistance network method (RNM) and temperature field calculation based on the finite volume method (FVM) can be used to evaluate the performance of high-voltage direct-current (HVDC) grounding electrodes.
Zheren Zhang, Zheng Xu, Tao Xu
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Gaoya dianqi, 2014 为研究金属构架遭雷击时的电磁特点及其影响因素,并应用于实际建构筑物的工程计算分析,提出将CDEGS软件应用于于这种计算,并利用电路法、有限元法和实验数据的对比验证了其可行性。文中还对金属构架内雷击电磁特点和部分影响因素进行了分析,得到离雷击点越远的垂直导体分流系数越小、各导体之间区域的磁场强度远小于导体附近等结论,并给出了雷击建构筑物时室内电子设备电磁防护的一些注意点。最后对一通信塔进行了实例分析。综上,CDEGS可应用于雷击室内电磁环境评估,具有一定的科研和业务应用价值。
沈寰, 冯民学, 李晓明
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Estudo e metodologia para medição da resistência de aterramento considerando espaçamentos reduzidos e solos não homogêneos [PDF]
, 2022 Este trabalho apresenta um modelo matemático aplicado junto a um modelo de otimização para resolver o problema da estimativa da resistência de aterramento em áreas de espaçamento reduzido e solos não homogêneos.
Rodrigues, Luan Garcia
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Dianci bileiqi, 2013 为了简化计算双层土壤结构中特高压输电线路杆塔接地电阻,提出了将双层土壤结构等效为均匀土壤结构的计算方法。采用CDEGS软件仿真不同反射系数、不同上层土壤的厚度、不同垂直接地体长度的数据计算等值土壤电阻率,通过非线性拟合,得到等值土壤电阻率的计算公式,从而计算特高压杆塔单塔基接地电阻。还通过数据拟合得到利用系数的计算公式,从而计算四塔基的接地电阻。最后对拟合公式计算的接地电阻与CDEGS软件仿真计算的接地电阻进行了比较分析,其结果表明,简化公式有较高的精度,可为工程设计提供参考。
王兵, 潘文霞
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Grid Grounding Calculations for a 132-KV Substation Using Soil Backfilling
IEEE Access, 2019 Safe and reliable grid design is complicated by the compact design of gas insulated substations (GIS). This paper discusses the complete grounding design procedure for a 132-KV substation in the city of Al Kharj based on the IEEE-80 specifications and ...
Saeed Alyami
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On Supermodular Contracts and Dense Subgraphs
, 2023 We study the combinatorial contract design problem, introduced and studied by Dutting et. al. (2021, 2022), in both the single and multi-agent settings.
Dughmi, Shaddin +3 more
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Dianci bileiqi, 2015 采用铜包钢接地网能够有效降低工程造价,并能够有效降阻,为解决大型接地网中使用铜包钢导体而无法利用常用软件CDEGS对铜包钢导体建模的问题,需对铜包钢接地网的数值计算方法进行研究。本文根据铜包钢导体的自阻抗模型,将铜包钢等效为同尺寸的导体。利用贝塞尔函数展开式求解不同频率下的不同半径、不同镀铜层厚度的铜包钢导体的等效电阻率与等效磁导率,据此建立铜包钢导体的等效自阻抗模型。根据接地网数值计算方法,可利用铜包钢导体的等效电阻率和等效磁导率对铜包钢接地网予以数值计算。利用CDEGS建立铜包钢接地网模型 ...
杨琪 +6 more
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Research and Investigation of High Frequency Profile of Step and Touch Voltages Due to Fragmentation of the Grounding Grid [PDF]
The increasing demand and the benefits of electricity energy have led to the creation of huge power plants, so high voltage substations are necessary for electrical energy. Installing different small power plants to prevent consumption in different parts
Khorampour, Pourya, Shemshadi, Asaad
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Modelling induced fields in the human body exposed to electric fields from high voltage transmission lines designed to meet 10 kV/m at ground level [PDF]
, 2017 A dissertation submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science in Engineering.
Hubbard, Kenneth Roy
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Dianci bileiqi, 2018 良好的接地装置是确保风电系统安全可靠运行,保障电气设备及人身安全的重要设施。基于CDEGS软件结合某风电场接地系统工程实例,系统阐述了风机接地设计中土壤电阻率的测量方法,并利用RESAP模块建立双层土壤结构模型,根据风机布机处土壤结构及当地地理环境,提出单机及互联接地网设计方案,通过仿真计算分析了地网互联的有效性。考虑风电机组通常布置在平原或高海拔的山区,加之其构造特点,极易遭受雷击,运用CDEGS中的HIFREQ模块与FFTSES模块分析计算了雷电冲击下地网的暂态响应。雷电入侵时地网暂态电位显著升高 ...
史柳, 刘骐, 姜龙杰, 孔深
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