Results 71 to 80 of about 7,424,509 (170)
Materials and Corrosion, Volume 77, Issue 10, Page 1662-1671, October 2026.Schematic representation of the operando ICP‐OES setup during the electrochemical experiment (left). Resulting plot showing the dissolution of the individual alloy components of AA7075 as a function of applied potential in 10 mM NaCl (right). ABSTRACT This publication deals with the simultaneous acquisition of electrochemical and inductively coupled ...
Claudia Kutzer‐Schulze +2 more
wiley +1 more source
, 2021 This paper presents an electromagnetic transient analysis of lightning-initiated overvoltage stresses of the step-up transformers installed inside a nacelle of onshore, multi-megawatt, new-generation wind turbines.
Ranko Goic, Antun Meglic, Petar Sarajcev
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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
doaj +1 more source
Gaoya dianqi, 2023 在气体绝缘开关设备（gas insulated switchgear,GIS）中，隔离开关在操作过程中会产生快速暂态过电压（very fast transient overvoltage,VFTO），精确的隔离开关电弧模型对快速暂态过电压的仿真起着关键的作用。文中在分段电弧的基础之上，利用ATP-EMTP软件搭建了隔离开关多次重燃弧模型；为了研究负载端残余电荷对VFTO的影响，文中选取多组不同幅值的残余电压。仿真结果表明：基于分段电弧的多次重燃弧模型产生的VFTO谐波幅值比传统的时变电阻电弧模型要大 ...
张普, 莫付江, 刘欣桐, 王凡
doaj
, 2017 In recent years, with the rapid development of offshore wind turbines (WTs), the problem of lightning strikes has become more and more prominent. In order to reduce the failure rate caused by the transient overvoltage of lightning struck offshore WTs ...
Liang Zou +4 more
core +1 more source
EnergiesMultiple restrikes during gas-insulated switchgear (GIS) disconnector operations generate very fast transient overvoltage and associated electromagnetic disturbance.
Dandan Zhao +3 more
doaj +1 more source
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
doaj
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
doaj
Broadband VFTO Measurement Method Based on Modified UHF Sensors
EnergiesThe very fast transient overvoltage (VFTO) generated by the operation of disconnectors in gas-insulated switchgears (GIS) features a wide frequency band and a steep rising edge, posing a severe threat to the safe and stable operation of power grids ...
Can Guo +5 more
doaj +1 more source
Safety hysteresis comparator design for transient overvoltage detection [PDF]
This research introduces a safety hysteresis comparator that detects transient overvoltage in the track circuit relay interlocking of railway signaling system. This overvoltage is caused by voltage faults transmitted through the electric conductor on the
Kornkanok, Ukrit +2 more
core +1 more source