Results 71 to 80 of about 370 (172)
Study on transient voltage distribution characteristics of transformer windings [PDF]
, 2020 Very fast transient overvoltage (VFTO) with large waveform steepness and high amplitude can cause great harm to winding insulation of transformers and other equipment connected to it.
Ying,, Zang +3 more
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Dianci bileiqi, 2012 目前,由于多种因素,金属氧化物避雷器在抑制特快速暂态过电压（VFTO）方面的应用有限。为了满足VFTO下避雷器的动态特性的需求,笔者介绍一种适用于VFTO计算的避雷器模型,由于避雷器电容效应,造成高频下残压和放电电流之间存在时间延迟,导致避雷器响应速度变慢。结合实例,对采用文中建议的模型和IEEE建议的模型下的VFTO做了仿真分析。结果表明 ...
曲振旭 +4 more
doaj
Outdoor Insulation and Gas Insulated Switchgears
, 2022 This book focuses on theoretical and practical developments in the performance of high-voltage transmission line against atmospheric pollution and icing.
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, 2017 © 1994-2012 IEEE. This paper investigates the feasibility of a cost effective method to prevent internal resonance in power transformers connected to gas insulated substation (GIS) due to very fast transient overvoltage (VFTO) within the GIS.
Abu-Siada, Ahmed +3 more
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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
Self-Calibration Sensor for Contactless Voltage Measurement Based on Dynamic Capacitance. [PDF]
Sensors (Basel), 2023 Suo C +5 more
europepmc +1 more source
Dianci bileiqi, 2017 近些年来,SF6气体绝缘变电站（GIS）以优异的电气性能在国内外得到了广泛应用,但是运行中隔离开关（DS）的分合闸操作会引起快速暂态过电压（VFTO）,对电力设备绝缘造成严重威胁,已经引起了许多电力系统专家与学者的高度重视。国内外学者针对GIS中VFTO防护的问题,从VFTO的产生和传播过程两个方面进行了大量研究,提出了利用快速动作隔离开关、慢速动作隔离开关、分合闸电阻、铁氧体磁环、金属氧化物避雷器等来抑制VFTO的方法。分析了目前所研究的几种主要防护VFTO方法的研究现状 ...
南保峰 +6 more
doaj
Transmission Line Voltage Measurement Utilizing a Calibrated Suspension Grounding Voltage Sensor. [PDF]
Sensors (Basel), 2023 Huang R +5 more
europepmc +1 more source
Pretemporal Transcavernous Approach for Resection of Non-meningeal Tumors of the Cavernous Sinus: Single Center Experience. [PDF]
Front Surg, 2022 Huang M +5 more
europepmc +1 more source
Propagation and mitigation of Very Fast Transient Overvoltage in Gas Insulated Substation
, 2015 Very Fast Transients are surge overvoltages created for example when opening or closing a disconnector switch (DS). Because of the very high frequency stress they exert on the equipment and their magnitude (up to 3 pu), they constitute an important issue
Galliano, Francois
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