Results 21 to 30 of about 889 (166)
Journal of Physics: Conference Series, 2022 Compared with the traditional GIS station, complex wiring and operation mode of pumped-storage plant diversity, working condition of frequent transformation, makes the plant to produce very fast transient overvoltage (VFTO) probability increase greatly ...
Chao Kang +3 more
semanticscholar +1 more source
Design of a New Busbar for VFTO Suppression and Analysis of the Suppression Effect
ElectronicsVery fast transient overvoltage (VFTO) is characterized by short wavefront time, high amplitude and wide frequency. VFTO poses a threat to the safe operation of power equipment.
Huan Wang +4 more
semanticscholar +1 more source
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
Modeling of Common Mode Interference of Secondary Side of Potential Transformer in VFTO Excitation
Shanghai Jiaotong Daxue xuebaoVery fast transient overvoltage (VFTO) is generated during the operation of isolation switches and circuit breakers in substations, which can affect the safe and reliable operation of power secondary equipment through cable transmission and spatial ...
PANG Fubin, JI Jianfei, WU Xianqiang, ZHOU Mengxia, YAN Wei, XU Dong
doaj +1 more source
The electromagnetic effect study of GIS enclosure under high‐frequency electromagnetic pulse
The Journal of Engineering, Volume 2019, Issue 16, Page 2837-2841, March 2019., 2019 In gas insulated switchgear (GIS) substation, due to the operation of disconnect switch and circuit breaker, as well as short‐circuit fault, SF6 will break down very rapidly. The superposition of refraction and reflection of high‐frequency travelling waves will cause the very fast transient electromagnetic pulse (EMP).
Shu Chen +6 more
wiley +1 more source
Research on Improved Arc Model of Isolating Switch and VFTO Characteristics
, 2022 The simulation of very Fast Transient overvoltage (VFTO) requires an accurate isolating switch arc model. Based on gas discharge theory, the trend of electron number in the gap is analyzed by particle continuity equation simulation.
Zhuang-zhuang Yang
semanticscholar +1 more source
The Journal of Engineering, Volume 2019, Issue 16, Page 2921-2925, March 2019., 2019 An accurate computational model of transformer winding for potential distribution analysis under impulse voltage is very important for the design of transformer inter‐turn insulation, especially for large capacity transformers such as ultrahigh‐voltage DC (UHVDC) converter transformer.
Shuang He +7 more
wiley +1 more source
The Study of VFTO Distribution in the Insulation System of IOCT Used in Traction Network
Energies, 2022 The FDS (Frequency-domain Dielectric Spectroscopy) of oil-immersed insulation paper, and semi-conductive paper with different moisture content, has been measured.
Zhonghuan Su +5 more
semanticscholar +1 more source
A novel GIS breakdown location method based on natural frequency of transient voltage
High Voltage, Volume 10, Issue 4, Page 856-875, August 2025.Abstract During on‐site withstand voltage tests of gas‐insulated switchgears (GIS), once a breakdown occurs, it is hard to locate the breakdown position due to the intricate branch structures and minimal breakdown energy. The existing methods may require the placement of a large number of sensors with unsatisfactory accuracy, which adversely affects ...
Qiang Sun +9 more
wiley +1 more source
The Journal of Engineering, Volume 2019, Issue 16, Page 1144-1148, March 2019., 2019 With the continuous expansion of power grid capacity and growth of voltage levels, the transient ground potential rise (GPR) caused by the switchgear operation has become great threaten to the safety of the grid. In the startup operation of 500 kV part of Taizhou 1000 kV ultra‐high voltage (UHV) substation, the electromagnetic lock installed in the ...
Fubin Pang +3 more
wiley +1 more source