Results 41 to 50 of about 107 (80)
Gaoya dianqi, 2013 全封闭SF6气体绝缘组合电器（gas insulated switchgear,GIS）中隔离开关操作产生的特快速暂态过电压（very fast transient overvoltage,VFTO）会严重影响电力系统的稳定性及相关设备的安全运行。通过研究GIS隔离开关的击穿过程和电弧的发展变化过程,进而采用合理的电弧模型进行仿真计算,对于得到较为准确的VFTO波形有重要意义。笔者对当前VFTO仿真中GIS隔离开关的传统电弧模型、改进模型及电弧特性的试验研究等进行了详细的介绍 ...
刘教民 +4 more
doaj
VFTO computation in 420 kV GIS
, 1999 This paper presents the results of Very Fast Transient Overvoltage (VFTO) computations that have been carried out using EMTP for various switching conditions in a 420 kV gas insulated substation.
Naidu, MS, Kumar, Vinod V, Joy, Thomas M
core
Self-Calibration Sensor for Contactless Voltage Measurement Based on Dynamic Capacitance. [PDF]
Sensors (Basel), 2023 Suo C +5 more
europepmc +1 more source
Transmission Line Voltage Measurement Utilizing a Calibrated Suspension Grounding Voltage Sensor. [PDF]
Sensors (Basel), 2023 Huang R +5 more
europepmc +1 more source
, 2022 Le manovre degli interruttori e sezionatori nelle sottostazioni in gas (GIS) generano sovratensioni veloci dette VFTO, Very Fast Transient Overvoltage.
Bozzato, Filippo
core
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
core +1 more source
Propagation and mitigation of Very Fast Transient Overvoltage in Gas Insulated Substation
, 2015 Very Fast Transients are surge overvoltages created for example when opening or closing a disconnector switch (DS). Because of the very high frequency stress they exert on the equipment and their magnitude (up to 3 pu), they constitute an important issue
Galliano, Francois
core
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
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
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
core +1 more source