Results 171 to 180 of about 1,585 (211)

Wideband Circuit Modeling of a Adjustable VFTO Simulator Considering Frequency-Dependent Characteristics

2022 IEEE 5th International Electrical and Energy Conference (CIEEC), 2022
Very fast transient overvoltage (VFTO) induced by switching operation in gas insulated switchgears (GIS) might cause disturbances and damages to terminated devices and equipment of both the primary and secondary sides.
Liu Kejie, Jun Zhao
semanticscholar   +1 more source

Damping of VFTO by RF resonator and nanocrystalline materials

2013 IEEE Electrical Insulation Conference (EIC), 2013
Very fast transient overvoltages (VFTO) are a well known phenomena in gas insulated switchgears (GIS). The main reasons for VFTO are switching operations of disconnectors. Thereby, several pre- or restrikes between the switching contacts occur and initiate steep voltage rises propagating inside the GIS.
S. Burow, W. Kohler, S. Tenbohlen, U. Straumann   +3 more
openaire   +1 more source

Study on the Effect of Space Radiated Electromagnetic Interference Generated by AC Filter Busbar VFTO on Secondary System

2025 International Conference on Electrical Automation and Artificial Intelligence (ICEAAI)
In recent years, with the implementation of the “Dual-Carbon Strategy”, the construction scale of new energy stations has gradually increased. AC filters in new energy stations can eliminate the large amount of harmonics generated by power electronic ...
Wei Shen, Sen Wang, Weibin Si, Xinyu Hao, Wei Li, Mingxi Zhu   +5 more
semanticscholar   +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

Experimental Investigation of the Influence of Branch Busbar Length on VFTO Amplitude in Gas-Insulated Equipment

2025 10th Asia Conference on Power and Electrical Engineering (ACPEE)
In recent years, with the rapid development of new power grid structures such as pumped storage power stations and high-voltage direct current transmission, ultra-high voltage (UHV) and extra-high voltage (EHV) equipment have experienced multiple ...
Hao Wang, Wei Wang
semanticscholar   +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
openaire   +1 more source

A Trigger Integrated VFTO Full Bandwidth Measurement System Based on Impedance Converter

IEEE International Conference on High Voltage Engineering and Application, 2022
Accurate measurement and stable trigger are essential for very fast transient overvoltage (VFTO) measurement. However, the existing VFTO measurement system has the problem of inaccurate measurement of the low-frequency signal (
Hao Liu, Wen Wang, Rongbin Shi, Houxian Du, W. Qin, Sihan Wang, G. Ma   +6 more
semanticscholar   +1 more source

Characteristic Analysis on Suppressing VFTO in GIS by Ferrite

Advanced Materials Research, 2013
When disconnecting switches were operated,Very Fast Transient Overvoltage (VFTO) did great harm to power systems and their equipments in Gas Insulated Substations (GIS). Although VFTO can be suppressed by a few of known methods, there were some problems.
Xiang Gen Gan, Shui Ping Zhong, Sheng Wei, Dong Bao Yang   +3 more
openaire   +1 more source

Equivalent Modeling of Disconnector Operation Based on Dynamic Arc Characteristics and VFTO Characteristic Analysis

Energies
To thoroughly analyze the high-frequency and high-amplitude electromagnetic disturbances generated during disconnector operation, this paper proposes an equivalent modeling approach based on dynamic arc behavior.
Bin Liu, Yong Liu, Junjun Xiong, Xiao-pin Deng, Zhenyu Guo, Xueyou Zhang, Bingyu Mei, Zhenhua Li   +7 more
semanticscholar   +1 more source

Measurement of VFTO Based on the Transformer Bushing Sensor

IEEE Transactions on Power Delivery, 2011
Disconnector switching operations in large gas-insulated switchgear (GIS) systems may produce very fast transient overvoltages (VFTOs), causing high electric stress to other apparatuses in the substation, such as power transformers. This paper presents a VFTO measuring technique based on a transformer bushing sensor, which consists of the transformer ...
Guo-Ming Ma, Cheng-Rong Li, Jiang-Tao Quan, Jian Jiang   +3 more
openaire   +1 more source