Results 11 to 20 of about 107 (80)

A novel embedded voltage‐clamped circuit for multilevel modular converters submodule to suppress very fast transient overvoltage

High Voltage
The submodule in multilevel modular converters experiences a very fast transient overvoltage (VFTO) during switch operation of gas‐insulated switchgear, which also results in overvoltage on power devices, such as thyristors and insulated gate bipolar ...
Hong Shen, Zhonghao Dongye, Mian Xiao, Jiayi Shao, Xiangyu Zhang, Yao Yao, Zifan Dong, Lei Qi   +7 more
doaj   +2 more sources

Research on Ultra-Fast Transient Overvoltage Characteristics of Electric Locomotive

Applied Sciences
Operating overvoltage occurs when the pantograph or main breaker of an electric locomotive is operated, which is prone to causing insulation failure of high-voltage equipment.
Yike Guo, Fuqiang Tian, Hongqi Liu, Yufeng Yin   +3 more
doaj   +2 more sources

The Statistical Characteristics Analysis for Overvoltage of Elevated Transmission Line under High-Altitude Electromagnetic Pulse Based on Rosenblatt Transformation and Polynomial Chaos Expansion

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, Dongwei Hei, Congguang Mao, Chuanbao Du, Xin Nie, Wei Wu, Wei Chen   +6 more
doaj   +2 more sources

Investigating the Effect of Several Model Configurations on the Transient Response of Gas-Insulated Substation during Fault Events Using an Electromagnetic Field Theory Approach

Energies, 2020
Assessment of very fast transient overvoltage (VFTO) requires good knowledge of the behavior of gas-insulated substation when subjected to very high frequencies.
Muresan Alexandru, Levente Czumbil, Roberto Andolfato, Hassan Nouri, Dan Doru Micu   +4 more
doaj   +3 more sources

Dispersion characteristics of switching transients from large‐scale experiments in a 1100 kV gas insulated switchgear circuit

High Voltage, 2023
The switching operation of gas insulated switchgear (GIS) disconnector will produce multiple random spark discharges between the gas gaps of the disconnector.
Zihan Teng, Weijiang Chen, Jiangong Zhang, Baoquan Wan, Jun Zhao, Kejie Li, Zhenghai Liao, Zheyuan Gan   +7 more
doaj   +2 more sources

Simulation on Operating Overvoltage of Dropping Pantograph Based on Pantograph–Catenary Arc and Variable Capacitance Model

Applied Sciences
When the electric locomotive pantograph is dropping, the interruption of pantograph catenary contact causes electromagnetic oscillation and arcing. The frequent arc burning that occurs due to charge accumulation results in the amplitude of overvoltage ...
Dazuo Jiang, Huanqing Zou, Yike Guo, Fuqiang Tian, Hongqi Liu, Yufeng Yin   +5 more
doaj   +2 more sources

Simulation and analysis of a gas insulated switchgear explosion accident caused by a failure of high-voltage circuit breaker in a thermal power plant

The Journal of Engineering, 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).
Xun Zhang, Kai Dai, Wei Niu, Rongbin Xie, Huarong Zeng, Yi Wen, Xiaohong Ma   +6 more
doaj   +2 more sources

Very Fast Transient Overvoltage Analysis on 245 kV Gas Insulated Substation

, 2022
Gas-insulated Substations play an important role in power systems today but are adversely affected by the generation of Very Fast Transient Overvoltages (VFTO).
Anuj Paul, Pavan Karpe, R. A. Ahire, Nilesh Chaudhari, Kartik Kapse   +4 more
core   +1 more source

Study of the behavior of low voltage ZnO varistors against very fast transient overvoltages (VFTO). [PDF]

, 2021
IlustracionesCaracterización de varistores de ZnO ante sobretensiones transitorias con tiempo de frentes muy rápidos (VFTO) Este trabajo presenta la caracterización de un tipo de varistores de ZnO ante sobretensiones transitorias con tiempo de frente muy
Rojo Ceballos, Clara Rosa
core  

Analysis of influential factors in determining very fast transient overvoltages of GIS substations [PDF]

, 2014
High voltage Gas Insulated Substation (GIS) is threatened by Very Fast Transient Overvoltage (VFTO) which is high amplitude and high frequency transient within the range from 100 kHz up to 50 MHz in power systems. Operation of Disconnecting Switch is the
Nourirad, Ghasem, Babaei, Mehdi, Maziar Babaei, Babaei, Maziar, Ghasem Nourirad, Mehdi Babaei   +5 more
core   +1 more source