Results 61 to 70 of about 7,424,343 (94)
, 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, 2019 特快速暂态过电压（very fast transient overvoltage,VFTO）严重威胁到气体绝缘开关设备（gas insulated substation,GIS）和邻近设备的安全运行,在总结前人研究的基础上,文中提出应用小磁环加装大磁环抑制GIS中的VFTO。依托VFTO发生器和真实500 kV GIS组成的试验平台,分别在充电电压为460、500、540、560 kV情况下开展无磁环、40、80 cm小磁环串和80 cm小磁环串加装10 cm大磁环串的一系列对比试验 ...
高凡夫 +5 more
doaj
Multi-spark modeling of very fast transient overvoltages for the purposes of developing HV and UHV gas-insulated switchgear and of conducting insulation co-ordination studies [PDF]
, 2017 Very fast transient overvoltages (VFTO) originate from steep voltage breakdowns in SF6gas that are inherent to operation of any switching device of the gas-insulated switchgear (GIS) type.
M. Szewczyk, Szewczyk, M.
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Gaoya dianqi, 2016 精确的隔离开关电弧模型对变电站特快速暂态过电压（very fast transient overvoltage,VFTO）的仿真有着关键性的作用。文中对开关电弧的电阻模型进行了优化,建立了电弧的分段模型。同时,笔者从间隙击穿,高频电弧熄弧对电弧重击穿的影响等方面进行了讨论,并以此为判据,建立了可以反映VFTO多次重燃过程的计算流程。根据实际测试线路,在ATP仿真软件中搭建了仿真电路并进行了暂态仿真。仿真结果表明,相对于单次燃弧的传统电弧模型,基于分段电阻的多次重燃弧模型可以更好地模拟实际开关特性 ...
张建功 +5 more
doaj
Time Domain Approach for Modelling Transformer Windings for Propagation of Fast Discharge Pulses
, 2016 A qualitative knowledge on electrical stress under power frequency excitation, as well as, switching and lightning surges is essential for the design of suitable insulation.
Santosh Janaki Raman +3 more
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Gaoya dianqi, 2010 在隔离开关切合容性小电流试验中,回路中可能会由于隔离开关的多次重燃而产生特快速暂态过电压（very fast transient overvoltage,VFTO）,这对试验回路中的设备和元件,尤其是试验变压器绕组绝缘构成了很大的威胁。笔者利用ATP-EMTP电磁暂态仿真软件计算了隔离开关进行分闸操作时在试验变压器端部出现的VFTO,分析了影响重燃过电压大小的因素,并研究了利用在试验变压器输出端加装保护间隙时的保护效果。仿真结果表明,分闸时重燃过电压与发生重燃的时间有关,与燃弧时间无关 ...
孟峥峥, 齐效华, 吕亮, 李彦明
doaj
Design of a New Busbar for VFTO Suppression and Analysis of the Suppression Effect
Very fast transient overvoltage (VFTO) is characterized by short wavefront time, high amplitude and wide frequency. VFTO poses a threat to the safe operation of power equipment.
Xixiu Wu +4 more
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, 2022 Le manovre degli interruttori e sezionatori nelle sottostazioni in gas (GIS) generano sovratensioni veloci dette VFTO, Very Fast Transient Overvoltage.
Bozzato, Filippo
core
Influence of Switching Conditions on the VETO Magnitudes in a GIS
, 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 (GIS).
Naidu, MS, Thomas, JM, Kumar, VV
core
New Techniques for Disconnector Switching VFT Mitigation in GIS [PDF]
, 2014 Switching operations in a Gas Insulated Substations (GIS) generate very fast transient over voltages (VFTO) which are dangerous for the transformer and the system insulation because of their short rise time.
Abd-Allah, Mousa Awad Allah +2 more
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