Results 181 to 190 of about 1,585 (211)

Experimental Study on the Interrelationships of VFTO, TEV, and EMF in Ultra-High Voltage Substations

2024 2nd China Power Supply Society Electromagnetic Compatibility Conference (CPEMC)
The interrelationship between very fast transient over-voltage (VFTO), transient enclosure voltage (TEV), and electromagnetic fields (EMF) is crucial for understanding the formation mechanism of switching transients in Gas Insulated Substations (GIS ...
Jun Zhao, Renbin Su, Yuan Ni, Zihan Teng, Zhenghai Liao, Jilai Xu   +5 more
semanticscholar   +1 more source

Exploring the Test Plan for the Impact of VFTO on Localized Protection Devices

Information Security Practice and Experience, 2021
The State Grid Corporation of China is steadily promoting the research and trial operation of localized protection devices, and the very fast transient overvoltage (VFTO) nuisance caused by disconnecting switch operation in GIS may affect the normal ...
Ye Xia, Huihai Liu, Jun Zhao, Zhiyang Zou, Xiaoli Zhang, Wei Li   +5 more
semanticscholar   +1 more source

Mitigation of VFTO from a Power Transformer bushing in a 275 kV Gas Insulated Substation

International Seminar on Intelligent Technology and Its Applications
Very Fast Transient Overvoltage (VFTO) is a potential cause of transformer bushing failures in Gas Insulated Substations (GIS). Protecting the power transformer from this dangerous overvoltage becomes imperative for the equipment safety.
Nasiru Yahaya Ahmed, H. Illias, H. Mokhlis, Daniar Fahmi, Mohd Taufiq Bin Mohd Khairi, Noradlina Abdullah   +5 more
semanticscholar   +1 more source

Calculation of Influence of VFTO Signal on Insulation of Main Equipment in 500kV Power Station

2021 4th Asia Conference on Energy and Electrical Engineering (ACEEE), 2021
The very fast transient over voltage (VFTO) caused by switching operation in GIS power station may threats equipment insulation especially transformers to research this problem, EMTP is adopted to calculate the overvoltage in 500 kV power station and a ...
Ren Hongtao, Chenyi Li
semanticscholar   +1 more source

Study on VFTO Influence of Main Equipment’s Safety Performance in UHV Substation

2024 6th International Conference on Power and Energy Technology (ICPET)
In UHV Gas Insulated Switchgear (GIS) substation, Very Fast Transient Overvoltage (VFTO) may occur during the operation of disconnector. VFTO stresses the GIS itself, turn-to-turn insulation of transformers, and all the secondary equipment connected to ...
Ruiming Fan, Lei Wan, Yang Li, Lei Wang
semanticscholar   +1 more source

A Novel Capacitance Determination Method of Metal Oxide Arrester Blocks when Excited by VFTO

2021 IEEE 5th Conference on Energy Internet and Energy System Integration (EI2), 2021
In recent years, the Ultra-High Voltage(UHV) and Extra-High Voltage (EHV) power system has been greatly developed. Subsequently, Gas Insulated Substation(GIS) has received more extensive attention and applications.
Jie Chen, Jie Guo, Jia-Min Zhang, K. Gao, Zhe Chen, Yang Liu   +5 more
semanticscholar   +1 more source

Fractional Lumped Parameter Modeling of Transformer Windings under VFTO

Applied Mechanics and Materials, 2014
Very fast transient overvoltage (VFTO) is very dangerous for the transformer which is directly connected to gas insulated substations (GIS). At the same time, due to the continuous increasing of operating frequency in the power system, under the high frequencies of the transmission line calculation and simulation process, it is necessary to consider ...
Gui Shu Liang, Guang Bo Zhang, Xin Liu
openaire   +1 more source

Measurement And Analysis Of VFTO In a 750kV Substation

2010 Asia-Pacific Power and Energy Engineering Conference, 2010
Disconnector operations in GIS may generate very fast transient overvoltage (VFTO), which is characterized by its high peak value, short rise time, and high frequencies. Mostly, researches on VFTO are focusing on the apparatus involving in the active circuit. However, VFTO may pass through open devices by electromagnetic coupling. To measure VFTO under
Jian Jiang, Guo-ming Ma, Cheng-rong Li, Jiang-tao Quan, Hao Wu, Hai-rui Xu, Bo Zhang   +6 more
openaire   +1 more source

Simulation of VFTO Suppression Methods for 1100kV GIS Substation

2019 IEEE 3rd Information Technology, Networking, Electronic and Automation Control Conference (ITNEC), 2019
Disconnector switch operation in GIS will generate VFTO, which will harm the equipment. Because there are many limitations in field measurement, simulation can overcome the limitations of experimental research, which can replace test measurement to a certain extent. In this paper, three VFTO suppression methods are simulated in ATP-EMTP.
Wenxiu Gong, Peijin Wang, Qingquan Li, Weijian Xue, Mu Qiao, Xiao Wang, Yumei Pan   +6 more
openaire   +1 more source

Modeling for transformer windings under VFTO based on s-parameters

2008 International Conference on Machine Learning and Cybernetics, 2008
To study the very fast transient over-voltage (VFTO) distribution in transformer windings in gas insulated substation (GIS), a systematic methodology based on s-parameters is presented for establishing high-frequency model of transformer windings in this paper.
null Ping Zhang, null You-Hua Wang, null Xin-Peng Nie, null Wei-Li Yan, null Hai-Jiao Zhang   +4 more
openaire   +1 more source