Results 51 to 60 of about 188 (115)
Modeling of Common Mode Interference of Secondary Side of Potential Transformer in VFTO Excitation
Shanghai Jiaotong Daxue xuebaoVery fast transient overvoltage (VFTO) is generated during the operation of isolation switches and circuit breakers in substations, which can affect the safe and reliable operation of power secondary equipment through cable transmission and spatial ...
PANG Fubin, JI Jianfei, WU Xianqiang, ZHOU Mengxia, YAN Wei, XU Dong
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Analysis of very fast transients using black box macromodels in ATP-EMTP [PDF]
, 2020 Modelling for very fast transients (VFTs) requires good knowledge of the behaviour of gas insulated substation (GIS) components when subjected to high frequencies. Modelling usually takes the form of circuit-based insulation coordination type studies, in
Albano, Maurizio +4 more
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Dianci bileiqi, 2023 超高压GIS中隔离开关的开闭合可能产生特快速暂态过电压(Very Fast Transient Overvoltage, VFTO),而VFTO会对GIS及其相连设备造成破坏，因此如何削弱VFTO对其他设备的影响迫在眉睫。以某500 kVGIS变电站为研究对象，对隔离开关开闭过程进行仿真建模，模拟VFTO的产生并对其波形进行分析，随后对避雷器的抑制效果进行了仿真验证，然后对只加装阻塞特定频带的阻波器进行了特性仿真，最后对阻尼母线方法进行优化。通过对比不同措施下的VFTO仿真结果 ...
李佰霖 +3 more
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Development of a square wave response experimental device for VFTO sensor calibration [PDF]
, 2019 LAUREA MAGISTRALENegli switchgear a isolamento gassoso (in inglese gas insulated switchgear, GIS), operazioni di commutazione o guasti a terra possono causare sovratensioni transitorie molto veloci (in inglese very fast transient overvoltages, VFTO), e i
CHEN, SHUO
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Gaoya dianqi, 2015 影响快速暂态过电压（very fast transient overvoltage,VFTO）因素很多,其中气体变电站（GIS）设备模型的选择对VFTO计算结果精确度的影响不可忽略。笔者采用考虑弧道电感特性的电弧电阻模型,结合国外某1 000 k V GIS变电站,详细计算了GIS内部的VFTO,分析了GIS内部关键设备处VFTO的极值。结果表明,用考虑弧道电感特性的电弧电阻模型模拟隔离开关的电弧的物理过程,进而对VFTO研究是适用的。最后还研究了入口电容、静态电感、GIS支路长度对VFTO的影响。
刘德东 +3 more
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Applied SciencesWhen the electric locomotive pantograph is dropping, the interruption of pantograph catenary contact causes electromagnetic oscillation and arcing. The frequent arc burning that occurs due to charge accumulation results in the amplitude of overvoltage ...
Dazuo Jiang +5 more
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New Techniques for Disconnector Switching VFT Mitigation in GIS [PDF]
, 2014 Switching operations in a Gas Insulated Substations (GIS) generate very fast transient over voltages (VFTO) which are dangerous for the transformer and the system insulation because of their short rise time.
Abd-Allah, Mousa Awad Allah +2 more
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Gaoya dianqi, 2015 由于气体绝缘变电站（GIS）隔离开关操作而产生的快速暂态过电压（very fast transient overvoltage,VFTO）,具有高频率、上升时间短、高幅值等特点,对GIS本体及相邻设备有较大危害。文中在隔离开关测量系统的基础上,研究了变压器耦合电容和隔离开关分合闸速度对VFTO和快速暂态电流（very fast transient current,VFTC）的影响。当变压器耦合电容分别取300、800、1 100 p F时,试验结果得出VFTO和VFTC的幅值会随着耦合电容的升高而增大 ...
赵承楠 +4 more
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Electromagnetic compatibility in various kinds of substations in Croatian transmission networks and mitigation measures [PDF]
, 2010 In the last two decades have been studied the conditions of electromagnetic compatibility (EMC) in different kind of substations in transmission networks of Croatia.
A. Sekso Telento, I. Dolić, S. Bojić
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Gaoya dianqi, 2016 文中采用电磁暂态分析程序（electro-magnetic transients program,EMTP）,以西山750 kV气体绝缘开关设备（gas insulated switchgear,GIS）电站为工程背景,计算研究了多种运行方式下隔离开关操作引发的快速暂态过电压（very fast transient overvoltage,VFTO）,深入分析了VFTO波形的特点,提取出其特征参量,并对特征参量进行规律统计,为VFTO标准波的归纳提供参考。计算结果表明,西山750 kV ...
朱跃, 周越, 颜湘莲, 王浩
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