Results 31 to 40 of about 107 (80)
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
doaj
Modelling and validation of metal oxide surge arrester for very fast transients
High Voltage, 2018 Metal oxide surge arrester models that are currently on rounds suffer from certain deficiencies and as a consequence, they are not in position to portray accurately the arrester residual voltages.
Kannadasan Raju, Valsalal Prasad
doaj +1 more source
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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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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, 2016 LAUREA MAGISTRALENelle sottostazioni isolate in gas (Gas-Insulated Switchgear, GIS), a causa di guasti a terra o a causa delle manovre di interruttori e sezionatori, possono verificarsi dei transitori veloci di tensione (Very Fast Transient Overvoltage,
CHEN, SHU
core
Study on transient voltage distribution characteristics of transformer windings
, 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 +7 more
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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
doaj
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
core
, 2018 Very fast transient overvoltages (VFTO) generated in a gas insulated substation (GIS) during disconnector switching operations are one of the major concerns in insulation design of the GIS.
Haseeb, M A, Thomas, M Joy
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Gaoya dianqi, 2017 在特快速瞬态过电压（very fast transient overvoltage,VFTO）的研究进程中,隔离开关操作过程中电弧重燃与熄弧的等效模型的建立,对VFTO计算结果有着重要的影响。采用ATP-EMTP内建MODELS模块,结合Mayr电弧分析理论,并考虑电弧电流过零熄弧的影响,建立了一种动态电弧模型。将该模型应用于某500 kV GIS电站VFTO计算中,并与另两种模型进行比较,详细分析其特性,结果表明,与简单电弧模型相比,动态电弧模型考虑了弧道电阻动态变化过程,使得VFTO最大幅值减小 ...
刘文博 +5 more
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