Results 21 to 30 of about 1,585 (211)
Gaoya dianqi, 2023 抽水蓄能电站与传统GIS电站相比，因开关操作更为频繁，产生VFTO概率更大，同时抽水蓄能电站由于地理环境限制需通过高压长电缆连接地上与地下两部分，接线形式的不同也会使产生的VFTO具有不同的特性。由于VFTO会严重威胁GIS设备、变压器和二次设备的运行安全，尤其是VFTO的幅值是导致设备绝缘损坏的重要因素，因此有必要对抽水蓄能GIS电站的VFTO幅值影响因素与权重进行深入研究。文中以某500 kV抽水蓄能GIS电站为例，采用仿真的方法计算分析了电站中VFTO幅值的影响因素和影响权重 ...
郝国文 +8 more
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Journal of Physics: Conference Series, 2022 Compared with the traditional GIS station, complex wiring and operation mode of pumped-storage plant diversity, working condition of frequent transformation, makes the plant to produce very fast transient overvoltage (VFTO) probability increase greatly ...
Chao Kang +3 more
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Dianci bileiqi, 2022 GIS中的隔离开关操作将会产生高幅值的VFTO,从而损害其设备造成系统故障。为了更加经济地抑制VFTO,提出了基于粒子群优化算法来抑制VFTO最佳铁氧体磁环尺寸的方法。通过模拟GIS中磁环对于VFTO抑制效果的分析，得出了磁环模型等效电阻和等效电感的取值范围；建立磁环尺寸参数的数学模型，利用粒子群优化算法优化得出最小的磁环尺寸。最后基于ATP-EMTP软件对某一1 100 kV GIS进行建模仿真，对比磁环优化前后对于VFTO幅值抑制效果。结果表明：优化前磁环和优化后磁环都能达到相同的抑制效果 ...
刘子英, 刘洋
doaj
Outdoor Insulation and Gas Insulated Switchgears [PDF]
, 2023 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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"El Vitor" a la Inmaculada en Nava del Rey [PDF]
, 1981 En número dedicado a: La provincia de ...
Garcíca Rodero, Cristina (fotógrafo) +1 more
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Upper bound of overvoltage peak induced in power line network above lossless ground due to radiated electromagnetic disturbances [PDF]
, 2023 This paper deals with the assessment of the maximal peak of the overvoltage induced in a power-line network due to the field-to-wire coupling from an external electromagnetic disturbance.
Liang, Tao +3 more
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The Study of VFTO Distribution in the Insulation System of IOCT Used in Traction Network
Energies, 2022 The FDS (Frequency-domain Dielectric Spectroscopy) of oil-immersed insulation paper, and semi-conductive paper with different moisture content, has been measured.
Zhonghuan Su +5 more
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The Journal of Engineering, Volume 2019, Issue 4, Page 3418-3424, April 2019., 2019 This study analyses a gas insulated switchgear explosion accident caused by a failure of the circuit breaker (CB) in a thermal power plant, which resulted in the explosion of the CB and the burning of the potential transformer (PT). Through X‐ray detection and disassemble examination of the damaged CB, it is found that the A‐phase moveable contact was ...
Xun Zhang +6 more
wiley +1 more source
Modeling of Common Mode Interference of Secondary Side of Potential Transformer in VFTO Excitation
Shanghai Jiaotong Daxue xuebaoVery fast transient overvoltage (VFTO) is generated during the operation of isolation switches and circuit breakers in substations, which can affect the safe and reliable operation of power secondary equipment through cable transmission and spatial ...
PANG Fubin, JI Jianfei, WU Xianqiang, ZHOU Mengxia, YAN Wei, XU Dong
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Design of a New Busbar for VFTO Suppression and Analysis of the Suppression Effect
ElectronicsVery 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.
Huan Wang +4 more
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