Results 91 to 100 of about 1,371 (186)
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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Transmission lines design to meet community requirements during constructions
, 2014 High Voltage (HV) transmission lines are widely spread around residential places. They take all forms of shapes: concrete, steel, and timber poles. Earth grid always form part of the HV transmission structure, whereas soil resistivity value is one of the
J. Rizk +9 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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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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, 2019 Alzheimer's disease (AD), a degenerative disease of the central nervous system, is the most common form of dementia in old age. The complexity and behavior of circular RNA (circRNA)-associated competing endogenous RNA (ceRNA) network remained poorly ...
Fulong Yu (3398372) +3 more
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, 2019 Alzheimer's disease (AD), a degenerative disease of the central nervous system, is the most common form of dementia in old age. The complexity and behavior of circular RNA (circRNA)-associated competing endogenous RNA (ceRNA) network remained poorly ...
Fulong Yu (3398372) +3 more
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EnergiesThe distribution of renewable energy sources is geographically limited. In the process of long-distance transmission, the direct current flowing from a ground electrode into the ground will cause a higher step voltage, which will bring serious security ...
Qi Xiong +4 more
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Dianci bileiqi, 2017 由于土地资源日益紧缺,变电站占地面积越来越小,仅仅依靠单一的水平接地网很难在变电站站址范围内构造出满足要求的接地。在南方丘陵地区,对一些建在推土、垫土等山坡地带的变电站,利用小山坡,凹地构建双层地网,充分利用变电站区域,有效的降低变电站接地电阻,同时也能解决由垫土层形成的双层土壤的亲和问题。对双层接地网与垂直接地极进行仿真比较,并通过仿真分析了江门某换流站的双层接地网设计,提出了在土壤结构复杂、接地面积小的地方实现最优的接地选择,因此对双层接地网在山地、丘陵和上坡等特殊环境的研究具有一定的意义。
陈志红, 朱力宏
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, 2019 Alzheimer's disease (AD), a degenerative disease of the central nervous system, is the most common form of dementia in old age. The complexity and behavior of circular RNA (circRNA)-associated competing endogenous RNA (ceRNA) network remained poorly ...
Fulong Yu (3398372) +3 more
core +1 more source