Results 11 to 20 of about 889 (166)

Research on the fitting method to describe the mathematical expression of VFTO in GIS

The Journal of Engineering, 2018
Very fast transient over voltage (VFTO) is a unique electromagnetic transient phenomenon occurring in Gas Insulated Substation (GIS), which determines the insulation level of the GIS (above 330 kV).
Reem A. Almenweer, Su Yixin, Wu Xixiu
doaj   +2 more sources

Dispersion characteristics of switching transients from large‐scale experiments in a 1100 kV gas insulated switchgear circuit

High Voltage, Volume 8, Issue 6, Page 1253-1263, December 2023., 2023
Abstract The switching operation of gas insulated switchgear (GIS) disconnector will produce multiple random spark discharges between the gas gaps of the disconnector. Each spark discharge can be affected by various random factors, such as trapped charge on the load side, the initial operating phase, gap distance and operating speed of the disconnector,
Zihan Teng, Weijiang Chen, Jiangong Zhang, Baoquan Wan, Jun Zhao, Kejie Li, Zhenghai Liao, Zheyuan Gan   +7 more
wiley   +1 more source

Restrike characteristics of vacuum circuit breaker in its opening process under DC voltage

IET Science, Measurement &Technology, Volume 17, Issue 8, Page 297-307, October 2023., 2023
In this paper, a withstand voltage test platform of 40.5‐kV vacuum circuit breaker was established to obtain the effects of the contact spacing and loop and inrush currents of vacuum circuit breaker on the number of restrike, the wavefront steepness of the breakdown voltage, and the breakdown duration.
Jixing Sun, Yongzhi Fan, Jiyong Liu, Jindong Huo, Sibo Song, Yujian Ding, Yu Tian, Huili Wang, Nana Wu   +8 more
wiley   +1 more source

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, Guoming Ma, Weiqi Qin, Wei Wang, Houxian Du, Lei Wang, Shicong Zhai, Fuping Zeng, Weixing Han   +8 more
wiley   +1 more source

A quantitative research on the level of disturbance to secondary signal ports of electronic voltage transformers under the operation of gas‐insulated switchgear

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, Chao Fu, Fanwu Chu, Yue Tong, Xiaozhou Wang, Guoxiong Ye, Xiong Wu   +6 more
wiley   +1 more source

Study on Very Fast Transient Overvoltage Characteristics of Gas‐Insulated Switchgear Substation Based on Hybrid Reactive Power Compensation

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, Zheng Yang, Yitao Lu, Yongfeng Huang, Hanliang Lin, Zhiyuan Zhang, Taiyu Chen, Yingnan Liu, Bo Yang   +8 more
wiley   +1 more source

Interference to the Secondary Cable Caused by a Very Fast Transient Overvoltage in a Gas‐Insulated Switchgear Substation

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, Zhiyuan Zhang, Hongshun Liu, Yifan Wang, Yingnan Liu, Dayang Yu, Qiuqin Sun   +6 more
wiley   +1 more source

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, Hui-bin SUI, Ying-chao LI, Shu-jiang LI   +3 more
openaire   +2 more sources

抽水蓄能GIS电站VFTO幅值影响因素与权重分析

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, 夏斌强, 王致远, 曹军, 王奎钢, 吴杨兵, 陈子龙, 王博涵, 郭洁   +8 more
doaj  

抑制GIS中VFTO的磁环尺寸优化

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