Results 71 to 80 of about 7,424,343 (94)
Gaoya dianqi气体绝缘金属封闭开关设备（gas-insulated metal-enclosed switchgear, GIS）在进行开关操作时会产生严重电磁干扰，为了减小特快速暂态过电压（very fast transient overvoltage, VFTO）等电磁暂态过程对二次设备的影响，文中搭建微缩GIS模拟实验平台，对VFTO在GIS中的传播特性进行研究。结果表明，线路末端VFTO的波形在空载情况下剧烈振荡，阻性负载下单调衰减，容性负载下阻尼性波动衰减。VFTO最大幅值与传输距离和负载性质有关 ...
成林, 杨鼎革, 王彦懿, 杨昌建
doaj
Gaoya dianqiGIS中的隔离开关在操作过程中由于断口重复击穿会产生特快速瞬态过电压（very fast transient overvoltage，VFTO）。VFTO幅值高、波前陡，严重威胁电气一次绝缘，并会产生电磁干扰问题。目前，实际工程中除采用带投切电阻的隔离开关抑制VFTO外，还可以采用磁环型阻尼母线对VFTO进行抑制。为了保证GIS的可靠性，磁环型阻尼母线抑制性能的优劣至关重要。为此，亟需研究提出一种在试验室进行磁环抑制效果的评定方法。文中针对磁环型阻尼母线的抑制性能，设计了专门的抑制性能试验回路 ...
杨喜龙 +6 more
doaj
An improved wide frequency model for VFTO of power transformers using transfer functions
, 2018 An accurate understanding of power transformer high frequency behavior is very important to assess the impacts on power system due to transient over-voltage conditions.
Jayarathna, KLIMPB +3 more
core
Simulation and Measurement of Restriking Voltage
, 2012 [[abstract]]DS has no arc extinction capability, during the movement of contact poles (for 0.5~2 seconds), there could appear with the repetitions of arc-inception and arc-extinction phenomena.
C. H. Lee;S. L. Chen;C. C. Yang
core
Gardu induk berinsulasi gas (GIS) telah digunakan secara hampir menyeluruh di seluruh dunia. Karena strukturnya yang ringkas menjadi alasan utama kenapa gardu induk banyak di gunakan.
Khoiri, Rizky Agung
core
Computation of very fast transient overvoltages (VFTO) in a 1000 kV gas insulated substation
, 2017 Very fast transient overvoltages (VFTO) generated in a gas insulated substation (GIS) during disconnector switching operations is one of the major concerns in insulation design of the GIS. Such over voltages can cause malfunctioning of the protection and
M Joy Thomas
exaly +2 more sources
Influence of switching conditions on the VFTO magnitudes in a GIS
IEEE Transactions on Power Delivery, 2001 Estimation of Very Fast Transient Overvoltage (VFTO) has been carried out using EMTP for various switching conditions in a 420 kV gas insulated substation.
Naidu, MS, Kumar, Vinod V, Thomas, Joy M
exaly +1 more source
This paper deals with the very fast transient over-voltage (VFTO) in a 400 kV Gas insulated substation (GIS), with a special focus on the influence of GIS configurations and trapped charge on this overvoltage.
Omar Kherif +2 more
exaly +2 more sources
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Study of the behavior of low voltage ZnO varistors against very fast transient overvoltages (VFTO)
Electric Power Systems Research, 2023Alexander A Correa-Espinal +2 more
exaly
Influence of the Switching Speed of the Disconnector on Very Fast Transient Overvoltage
IEEE Transactions on Power Delivery, 2013Ban Liangeng
exaly