Results 81 to 90 of about 800 (186)
Dianci bileiqi, 2020 基于CDEGS仿真计算发现,采用多电流极法测量大型接地网接地电阻时,可以通过增加环绕接地网均匀布置的电流极数量方式缩短电流极与接地网之间距离,便于工程实际应用。探讨了一种工程实际中易于实现的多电流极测量方法。将多个电流极沿直线布设在接地网附近,根据CDEGS计算,五电流极沿直线布设的测量系统中均匀电流场效果最明显,当电压补偿点位置为0.8倍地网中心与直线布置的中心电流极之间的距离时,仿真计算出的测量误差不大于5%。
秦天, 刘浔, 涂春华, 吴国华
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Dianci bileiqi, 2022 为了提高输电线路的耐雷水平以及线路发生短路故障时故障电流能够通过接地体快速散流，以保障电力系统能够安全、稳定运行，本研究从实际运行的线路杆塔接地体入手，对其开展降阻优化工作，首先进行原有杆塔接地体的现场勘查，包括原有接地体工频接地电阻值和土壤电阻率分层的测量，其次在CDEGS中建立原有杆塔接地体的模型，验证仿真计算应用于接地体设计的可行性，最后在CDEGS中进行接地体的优化结构设计，包括增加射线和垂直接地极两种形式，计算结果证明在原有接地体周围增加射线可以起到较好的降阻作用 ...
王旭明 +4 more
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Effect of high resistive barrier on earthing system
, 2003 Substation earthing provides a low impedance path and carries current into ground under normal and fault conditions without adversely affecting continuity of service.
Chen, G, Osman, M, Pilling, N
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Review of Palaeobotany and Palynology, 2012 Abstract This work presents palynological and palynofacies analyses from early Silurian Tanezzuft Formation shales recovered from core material of borehole CDEG-2a drilled in Dor el Gussa at the eastern margin of the Murzuq Basin, southern Libya. The material has yielded well-diversified palynomorph and chitinozoan assemblages and organic matter from
Paris, Florentin +8 more
openaire +2 more sources
Overvoltage Effects on Ground Grid Systems of Single and Two Neighboring High Voltage Substations [PDF]
, 2016 The power networks with reliable transmission and distribution systems require high voltage substations with effective ground grid systems. Therefore, this study aimed to analyze the effects of overvoltage on ground grid systems within high voltage ...
Luewattana, Krung, Pruksanubal, Aphibal
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Numeric and fluid dynamic representation of tornadic double vortex thunderstorms [PDF]
Current understanding of a double vortex thunderstorm involves a pair of contra-rotating vortices that exists in the dynamic updraft. The pair is believed to be a result of a blocking effect which occurs when a cylindrical thermal updraft of a ...
Boaz, W. +3 more
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Modifying of expansive clay soils using alkali activated ESKOM dump ash [PDF]
, 2023 Please click Additional Files below to see the full ...
Anne Reynolds-Clausen, Kelley +3 more
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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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Grounding the fence of a power station [PDF]
, 2018 U diplomskom radu objašnjeni su različiti načini uzemljenja ograde elektroenergetskih postrojenja. Također su objašnjeni i najvažniji pojmovi pri uzemljenju elektroenergetskog postrojenja, a to su napon dodira i napon koraka.
Bijelić, Davor
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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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