Results 21 to 30 of about 229 (144)
A low‐cost and high‐performance self‐trigger method for high‐voltage transient measurement
High Voltage, Volume 8, Issue 2, Page 412-420, April 2023., 2023 Abstract Stable triggering of acquisition devices is critical to accurately measure electromagnetic transients, especially for very fast transient overvoltages (VFTOs). A highly stable and low‐cos t self‐trigger method for transient measurement is proposed.
Hao Liu +8 more
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High Voltage, Volume 7, Issue 1, Page 165-175, February 2022., 2022 Abstract The collectors of electronic transformers has the problem of electromagnetic incompatibility under the operation of disconnecting switches, which limits their wide application in smart grids. To evaluate the maximum level of disturbance that collectors are able to withstand in the stochastic process of switching operation, this work introduces
Qi Wang +6 more
wiley +1 more source
Mathematical Problems in Engineering, Volume 2022, Issue 1, 2022., 2022 In recent years, gas‐insulated switchgear (GIS) substations have become widely used in power systems. Due to their compact structure, extremely high oscillation frequencies are prone to extremely high oscillation transient overvoltages or very fast transient overvoltages (VFTOs) when the isolating switch or circuit breaker is operated.
Caiquan Wen +8 more
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南方能源建设, 2022 [Introduction] Massive usage of gas-insulated metal-enclosed switchgear (GIS) has caused serious electromagnetic interference, especially when the isolating switch in GIS is operated with small capacitive current, it does not have arc extinguishing ...
LI Jiahui
doaj +1 more source
Mathematical Problems in Engineering, Volume 2022, Issue 1, 2022., 2022 When a very fast transient overvoltage (VFTO) propagates in a high‐voltage bus, the capacitive voltage transformer (CVT) causes considerable interference on its secondary side, which will affect the normal operation of the secondary equipment. In this article, a CVT equivalent calculation circuit model was established, and the disturbance voltage of ...
Hanliang Lin +6 more
wiley +1 more source
VFTO computation in 420 kV GIS
11th International Symposium on High-Voltage Engineering (ISH 99), 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. The variation of VFTO peak along the nodes for disconnector and circuit breaker operations as well as the variation of VFTO with different trapped charges ...
Kumar, Vinod V, Joy, Thomas M, Naidu, MS
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The Optimization Design of VFTO Measuring Method
DEStech Transactions on Engineering and Technology Research, 2017 Whether VFTO can be fast accurate measured becomes an important index of GIS substation equipment safety. The research in this article used the optical voltage measuring method, through the simulation results of single photon road to analyze the advantages and disadvantages, furthermore the double optical path method was put forward, and by the ...
Xue-geng CHEN +3 more
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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
doaj
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
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