Results 11 to 20 of about 940 (189)
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 +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 +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 +8 more
wiley +1 more source
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
wiley +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
openaire +3 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 +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 +3 more
openaire +2 more sources
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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