Results 121 to 130 of about 229 (144)

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

Lumped parameter modeling of transformer windings under VFTO

2011 4th IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2011
Very fast transient overvoltage (VFTO) is very dangerous for the transformer which is directly connected to gas insulated substations (GIS). In order to study the voltage distribution in transformer windings under VFTO, a new model named the Piecewise Lumped Parameter (PLP) model is proposed.
Juan Du, Guishu Liang, Haifeng Sun, Xin Liu, Xixiao Liu   +4 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
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

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

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

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

Characteristic parameter analysis on the suppressing VFTO in GIS by ferrite

Proceedings of 2005 International Symposium on Electrical Insulating Materials, 2005. (ISEIM 2005)., 2005
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.
null Jin Lijun, null Zhang Yicheng, null Zheng Xianggong, null Shen Yuzhuo   +3 more
openaire   +1 more source

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
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