Results 151 to 160 of about 889 (166)

Dynamic arcing model of switching and its effect on VFTO

2011 1st International Conference on Electric Power Equipment - Switching Technology, 2011
In computational process of very fast transient over-voltage, it is essential to find an accurate model of the gas insulated substation. The arcing model of disconnector is particularly important. The general arc-resistance model is not available to give better simulation for the changing of status during the development of arc.
null Lin Xin, null Wang Na, null Xu Jian-yuan   +2 more
openaire   +1 more source

VFTO Spectrum Analysis Method Based on Continuous Wavelet Transform

2018 10th International Conference on Communications, Circuits and Systems (ICCCAS), 2018
Gas insulated substation (GIS) is widely used in urban and densely populated areas. Moreover, GIS equipment is used in all UHV AC transmission projects. The operation of the isolating switch in GIS produces very fast transient overvoltage (VFTO). When the frequency component contained in the VFTO is matched with the resonant frequency of the winding ...
openaire   +1 more source

Estimation and analysis of VFTO in 420kV Gas Insulated substation

2014 International Conference on Circuits, Power and Computing Technologies [ICCPCT-2014], 2014
Very Fast Transient Overvoltages (VFTOs) which are caused mostly due to disconnector operations in Gas Insulated substations (GIS) impose several problems on the insulation of the system and also to the connected high voltage equipment. Therefore, it is important to do a VFTO study in GIS.
Reuban Samikkannu, Santosh Kumar Annadurai   +1 more
openaire   +1 more source

Study on measurement of VFTO based on electric field sensor

2010 URSI International Symposium on Electromagnetic Theory, 2010
In power system, pulse voltage is measured by both the circuit and the electric field. The special measure of VFTO is determined by non-alterable equipments of GIS. In this paper, external transient voltage is measured by electric spherical probe which means it is not necessary to access any equipment to the system.
null Zhang Weidong, null Zhang Zhilong, null Cui Xiang, null Ma Guoming, null Li chengrong, null Wang xin   +5 more
openaire   +1 more source

Arcing Model of a Disconnector and its Effect on VFTO

Plasma Science and Technology, 2013
In the computational process of very fast transient over-voltage (VFTO), it is essential to find an accurate model for a gas insulated substation. The arcing model of the disconnector is particularly important. The general arcing model is not able to give a good description of the arc development process. In this paper, based on the physical process of
Xin Lin, Na Wang, Jianyuan Xu
openaire   +1 more source

Simulation of VFTO by ATP/EMTP with Various Arc Models

Applied Mechanics and Materials, 2014
Several arc models representing a disconnector’s closing operation in a 252kV gas insulated switchgear (GIS) are implemented with a computer program ATP/EMTP to simulate very fast transient overvoltage (VFTO). Arc models are used as black box models in connection with a test circuit.
Hang Dai, Xiao Fan Liu, Wei Dong Zhang
openaire   +1 more source

Modeling of The Transformer Windings under VFTO based on Transfer Function

2006 International Conference on Power System Technology, 2006
A systematic methodology is presented for establishing the high frequency circuit model of transformer windings under VFTO based on transfer functions in this paper. Firstly, the voltage transfer functions are deduced from the S parameters which are measured by network analyzer.
Xile Zhang, Guishu Liang, Qing Xie, Haifeng Sun   +3 more
openaire   +1 more source

Development of Full Frequency Bandwidth Measurement of VFTO in UHV GIS

IEEE Transactions on Power Delivery, 2013
In order to study the characteristics of very fast transient overvoltage (VFTO) in ultra-high voltage (UHV) gas-insulated switchgear (GIS), the authors have developed a full frequency bandwidth measurement system based on a porthole-type capacitive voltage divider.
Yue Gongchang, Liu Weidong, Chen Weijiang, Guan Yonggang, Li Zhibing   +4 more
openaire   +1 more source

Estimating the Size of Ferrite for Suppressing VFTO in GIS

2006 IEEE 8th International Conference on Properties and applications of Dielectric Materials, 2006
The insulation of apparatus in the power system is often broken by the very fast transient over voltage (VFTO), which cause from the operation of disconnector in gas insulate substation (GIS). In this paper, a new idea for the Suppressing VFTO by ferrite is put forward, and the characteristic of ferrite is analyzed.
Jin Lijun, Zheng Yuanbing, Pen Ge, Yuan Zheng, Zheng xianggong   +4 more
openaire   +1 more source

Research on VFTO Characteristics of AC Withstand Voltage Test of GIS Equipment

2023 Panda Forum on Power and Energy (PandaFPE), 2023
Qian Wang, Jia Liu, Hao Huang, Hongbo Cui, Xiaochuan Xu, Yi Yang, Hongkang You   +6 more
semanticscholar   +1 more source