Results 21 to 30 of about 188 (115)
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
Energies, 2023 A High-Altitude Electromagnetic Pulse (HEMP) could induce very fast transient overvoltage (VFTO) with nanosecond level rise time and mega-volt amplitude, which severely threatens the electrical devices connected to the elevated transmission line.
Zheng Liu +6 more
doaj +1 more source
Uncovering gas insulated substation transient behaviours using the equivalent cable model [PDF]
, 2023 An improved circuit theory is proposed for verification of data obtained with the ElectroMagnetic Field (EMF) theory approach for the study of Gas Insulated Substations (GIS) transient behaviours.
Czumbi, Levente +3 more
core +2 more sources
Outdoor insulation and gas-insulated switchgears [PDF]
, 2022 Introduction With the growth of the world’s population and faster-developing industries, larger amounts of electric energy are needed [1–6]. To reduce Joule losses at longer distances, voltages delivered by generators are increased with step-up power ...
Brettschneider, Stephan, Fofana, Issouf
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A modified lumped parameter model of distribution transformer winding [PDF]
, 2020 This work was supported by the National Key Research and Development Plan of China under Grant (2016YFB0900600XXX).The modelling of the distribution transformer winding is the starting point and serves as important basis for the transformer ...
Ding, Qingqing +7 more
core +1 more source
Performance improvement of MO surge arrester using high gradient arrester block against VFTOs [PDF]
, 2019 It is well known that the metal oxide surge arrester is inoperative against very fast transients overvoltages (VFTOs) because of its strong stray capacitive effect.
Raju, Kannadasan
core +2 more sources
Research on Conducted Disturbance to Secondary Cable Caused by Disconnector Switching Operation
Frontiers in Energy Research, 2022 The disconnector switching operation in GIS not only generates very fast transient overvoltage (VFTO) in primary equipment, but also couples to the secondary system, which affects normal operation of the secondary equipment.
Xiaoyue Chen +6 more
doaj +1 more source
Study on transient voltage distribution characteristics of transformer windings [PDF]
, 2020 Very fast transient overvoltage (VFTO) with large waveform steepness and high amplitude can cause great harm to winding insulation of transformers and other equipment connected to it.
Xie Yu, Xu Jianwen, Xu Tao, Zang Ying
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Modern Applications in Optics and Photonics: From Sensing and Analytics to Communication [PDF]
, 2022 Optics and photonics are among the key technologies of the 21st century, and offer potential for novel applications in areas such as sensing and spectroscopy, analytics, monitoring, biomedical imaging/diagnostics, and optical communication technology ...
core +1 more source