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Experimental Research on Suppressing VFTO in GIS by Magnetic Rings
IEEE Transactions on Power Delivery, 2013Very-fast transient overvoltage (VFTO) is a serious threat to the insulation of extra-high voltage and ultra-high voltage power-system equipment and should be suppressed. A simpler and more reliable VFTO suppressing method than a shunt resistor is presented in this paper, which uses magnetic rings installed on the center conductor of gas-insulated ...
Weijiang Chen
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Simulation of VFTO Suppression Methods for 1100kV GIS Substation
2019 IEEE 3rd Information Technology, Networking, Electronic and Automation Control Conference (ITNEC), 2019Disconnector 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.
Qingquan Li, Mu Qiao
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Improved SVD-MPM Applied in Spectral Analysis of VFTO
2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE), 2022Kang He, Xianqiang Li
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Statistical Analysis of VFTO Time Domain Modal Parameters
2023 6th International Conference on Energy, Electrical and Power Engineering (CEEPE), 2023Kang He
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Analysis of VFTO in 1000kV GIS
2020 6th Global Electromagnetic Compatibility Conference (GEMCCON), 2020With the development of UHV (Ultra High Voltage) transmission technology, GIS(Gas Insulated Substation) is usually used at all levels of substations, but it will produce VFTO (Very Fast Transient Overvoltage)when operating its isolating switch. It has the characteristics of large amplitude, high frequency and fast fluctuation.
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Measurement And Analysis Of VFTO In a 750kV Substation
2010 Asia-Pacific Power and Energy Engineering Conference, 2010Disconnector 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 +6 more
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Study on the transient characteristics of 1100kV VFTO
2017 4th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST), 2017The very fast transient overvoltage (VFTO) generated by switching disconnector (DS) in gas insulated substation (GIS) with the features of high amplitude, short rise-time and complex frequency components, may cause damage to the insulation of electrical equipment.
Wu Xixiu +4 more
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Research of VFTO in 110kV minimized GIS
2015 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT), 2015110kV minimized gas insulated substation (GIS) has been widely used in China, due to its great electrical properties. The closing or opening operation of disconnector switches (DS) and circuit breaker (CB), and single-phase ground fault are all probable to cause the very fast transient overvoltage (VFTO), which is a threat to the power system. Compared
He Qifei, Hao Zhiguo, Guo Jie
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The influence of the distributed trapped charge on VFTO
2010 5th International Conference on Critical Infrastructure (CRIS), 2010In this paper, the nodal admittance equation is derived for analyzing the response of the transmission line under the residual voltage due to uniformly distributed charge along the line in Laplace domain. We equivalent the trapped charge to the current sources which are located at near-end and far-end when the disconnector switching is operated.
Hongyang Yu, Binxian Lu
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Study on VFTO in UHV GIS substation
2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT), 2011In GIS substations, operations of disconnectors may cause very fast transient overvoltage (VFTO) with high amplitude and steep wave front. Considering the narrower insulation margin of UHV GIS equipments and larger absolute magnitude of VFTO in UHV GIS systems, VFTO in UHV GIS systems could cause larger damage than those in EHV and lower ones ...
Wan Yiru, Chen Guang, Zhou Hao
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