Results 41 to 50 of about 7,424,343 (94)
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
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A New Cost Effective Approach to Suppress Very Fast Transients on Power Transformers Connected to Gas Insulated Substations [PDF]
, 2016 This thesis investigates the feasibility of a new method to prevent internal resonance in transformers connected to gas insulated substation due to very fast transient overvoltage in the GIS.
Babaeilaktarashani, Mehdi
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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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Study of the behavior of low voltage ZnO varistors against very fast transient overvoltages (VFTO). [PDF]
, 2021 IlustracionesCaracterización de varistores de ZnO ante sobretensiones transitorias con tiempo de frentes muy rápidos (VFTO) Este trabajo presenta la caracterización de un tipo de varistores de ZnO ante sobretensiones transitorias con tiempo de frente muy
Rojo Ceballos, Clara Rosa
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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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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
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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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Protection against transient overvoltage in precision AC-DC measurement system [PDF]
, 2020 : Reduction in size and improvement of sensitive margins in modern semiconductor devices makes them increasingly susceptible to stress and subsequent damage caused by the overvoltage.
Kgakatsi, Thato E. +3 more
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Transfer Function Based Modeling of the Air-Cored Transformers for Very Fast Transient Overvoltage Studies [PDF]
, 2009 In this paper, to calculate overvoltage in air-cored transformer windings under very fast transient overvoltage, firstly, the voltage transfer functions are calculated which are measured by network analyser or calculated from the distributed parameters ...
Esmaiilzadeh, S. +4 more
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Numerical Analysis of a Spiral Tube Damping Busbar to Suppress VFTO in 1000 kV GIS
, 2019 Gas insulated substations (GISs) are broadly used for transmission and distribution in electric power networks. Very fast transient overvoltage (VFTO) caused by SF6 discharge during switching operations in a GIS may threaten the insulation of electrical ...
Yi-Xin Su, Reem A. Almenweer, Wu Xixiu
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