Results 11 to 20 of about 1,585 (211)

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

Determination of Stray Inductance of Low-Inductive Laminated Planar Multiport Busbars Using Vector Synthesis Method [PDF]

, 2020
Laminated busbars connect capacitors with switching power modules, and they are designed to have low stray inductance to minimize electromagnetic interference. Attempts to accurately measure the stray inductance of these busbars have not been successful.
Hu, Junzhu, Kang, Wei, Liao, Sizhuo, Lu, Binxian, Naayagi, R. T., Pickert, Volker, Wu, Haimeng   +6 more
core   +2 more sources

Hybrid organic-inorganic light-emitting electrochemical cells using fluorescent polymer and ionic liquid blend as an active layer [PDF]

, 2014
We demonstrate enhanced device performance by using a blend of emissive polymer and mobile ionic liquid molecules in hybrid organic-inorganic polymeric light-emitting electrochemical cells with high air stability.
Kim, Jin Young, Kim, Sang Ouk, Lee, Bo Ram, Lee, Hyun Jung, Park, Ji Sun, Song, Myoung Hoon   +5 more
core   +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