Results 91 to 100 of about 1,820 (204)
Dianci bileiqi, 2023 安装线路避雷器是输电线路最有效的防雷方法之一，常规的避雷器安装方式未考虑实际杆塔的结构、地形以及闪络成本等问题，导致技术经济性较差，存在一定的盲目性。为研究避雷器的经济性安装方案，基于ATP-EMTP与电气几何模型建立了同塔双回杆塔电磁暂态分析模型。研究了杆塔结构、地形地貌对双回线路闪络风险的影响，并考虑线路闪络成本对避雷器安装方式的影响，提出利用技术经济性指标W对避雷器不同安装方式下的防雷效果和经济性进行综合评估，当W>0时，避雷器安装具有经济性，W值越大，技术经济性越强。
艾上美, 马御棠, 张林华, 潘浩
doaj
Low-Cost Monitoring of Synchrophasors Using Frequency Modulation
Energies, 2019 A new, low-cost method of simultaneously measuring and communicating voltage and current on distribution networks is presented. Based on Frequency Modulation (FM) of the measured fundamental frequency (and harmonics), followed by immediate re-injection ...
Stephen Robson +2 more
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Winding-to-ground fault location in power transformer windings using combination of discrete wavelet transform and back-propagation neural network. [PDF]
Sci Rep, 2022 Chiradeja P, Ngaopitakkul A.
europepmc +1 more source
Dianci bileiqi, 2013 国内煤矿输电线路防雷技术众多,从目前使用情况看,效果不是很好。主要原因是雷电活动的随机性,加上煤矿所处环境的复杂性,很难确定雷击故障的类型,造成防雷措施针对性不够强[1]。介绍了一种基于ATP-EMTP的线路避雷器的仿真,建立的某煤矿的线路防雷模型,仿真并验证了避雷器安装原则,对合理、经济使用线路避雷器这一防雷措施具有建设性的意义。
刘建华, 姚建国, 李慧敏
doaj
Dianci bileiqi, 2013 对避雷器内部局部放电的定位方法进行研究,提出了一种有效的针对避雷器及其类似设备内部缺陷定位的极性定位法,并通过EMTP/ATP仿真技术及现场试验验证,验证了该方法的正确性和可行性,具有一定的工程实践意义。
邱太洪 +4 more
doaj
Complexity, 2018 A large number of electromagnetic transient studies have been analyzed for finding the overvoltage behavior of power system. A grounding grid of power system is so important for reducing the effect of overvoltage phenomena during a short-circuit event ...
Saeid Gholami Farkoush +7 more
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Simulation of transient effects in the course of swiching off the HV short linc faults. [PDF]
, 2014 Import 05/08/2014Zadáním diplomové práce je zpracování modelu přechodových jevů při vypínání blízkých zkratů v síti vvn. V první části teoreticky popisuji jednotlivé přechodové děje od těch nejjednodušších v stejnosměrných obvodech až po ty složitější. V
Janák, Jan
core
Evaluation of the backflashover performance of a 150 kV overhead transmission line considering frequency- and current-dependent effects of tower grounding systems [PDF]
The influence of the frequency- and current-dependent response of tower grounding systems on evaluating the backflash over performance of a typical 150 kV overhead transmission line is investigated in this study.
Araneo R. +5 more
core +1 more source
Evaluation of the efficacy of transient overvoltages suppression measures in different wind farm topologies using SF6 circuit breaker. [PDF]
Sci Rep, 2023 Eliyan T, Wadie F.
europepmc +1 more source
Characterising power quality disturbances resulting from current limiting fuse operation
Ingeniería e Investigación, 2011 This article presents novel and easily implemented tools for characterising electrical disturbances originated by fuse operations. A methodology is described that (with the use of some descriptors) led to identifying electrical disturbances of this kind.
N. Ortiz S. +3 more
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