Results 141 to 150 of about 370 (172)

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

Design Optimization of Ferrite Rings for VFTO Mitigation

IEEE Transactions on Power Delivery, 2017
Very fast transient overvoltage (VFTO)-related problems are raising growing concerns in China with the development of ultra-high voltage. The practice of fitting ferrite rings on gas-insulated switchgear busbars for VFTO mitigation has long been proposed but few investigations on its' design optimization were conducted. Based on theoretical analysis of
Jiaxi He, Yonggang Guan, Weidong Liu, Weijiang Chen, Zhibing Li   +4 more
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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

Calibration of VFTO bushing sensor based on convolution model

2009 IEEE Intrumentation and Measurement Technology Conference, 2009
Disconnector switching operations in large gas insulated switchgear (GIS) systems may cause very fast transients overvoltages (VFTO), which produce dielectric stress to transformer connecting with the disconnector. A VFTO bushing sensor is developed to measure the VFTO at the transformer entrance. Since the high frequency ratio of the bushing sensor is
Guo-ming Ma, Cheng-rong Li, Jiang-tao Quan, Jian Jiang   +3 more
openaire   +1 more source

Transient modeling and analysis of transformer windings under VFTO

2008 7th World Congress on Intelligent Control and Automation, 2008
Calculation of over-voltage distribution of transformer windings under Very Fast Transient Over-voltage (VFTO) is very important to insulate design of transformers windings. In order to investigate over-voltage distribution under VFTOs, a proposed model using lumped-parameter components is presented in this paper. In the case of easily destroyed former
null Ping Zhang, null Youhua Wang, null Xinpeng Nie, null Weili Yan, null Haijiao Zhang   +4 more
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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

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
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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
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The Study of VFTO Distribution in the Insulation System of IOCT

2023 IEEE Sustainable Power and Energy Conference (iSPEC), 2023
Qingdan Huang, Haoyong Song, Yuqing Chen, Huihong Huang, Yong Wang   +4 more
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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