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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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Design of Triggering Device for VFTO Measurement System
Advanced Materials Research, 2012Very fast transient overvoltage (VFTO) can be generated during the operation of disconnect switch (DS). Especially in ultra high voltage (UHV) gas insulated substation (GIS), VFTO is a threat to the safety of the power system equipment. It is very important to measure VFTO waveforms accurately.
Gong Chang Yue +3 more
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Implementation of Radiation and Soil Losses in VFTO Simulation by Frequency-Domain TL Model
IEEE Transactions on Power Delivery, 2022Transmission line (TL) models are widely used within the simulation of the very fast transient over-voltages (VFTO) for gas-insulated substations (GISs); however, due to quasi-TEM approximation and model complexity, energy losses related to bushing ...
Jun Zhao +6 more
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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
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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
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Calibration of VFTO bushing sensor based on convolution model
2009 IEEE Intrumentation and Measurement Technology Conference, 2009Disconnector 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 +3 more
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Research on VFTO Characteristics of Substation using GIL-GIS-oil/SF6 Bushing Structure
IEEE International Conference on High Voltage Engineering and Application, 2022GIL is one of the important ways to connect GIS substations through existing overhead lines in urban substations, and GIS is directly connected to the main transformer through oil/SF6 bushings, which is one of the important means to make the substation ...
Junfei Wang, X. Jiang, Lei Wang, Han Li
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Damping of VFTO by RF resonator and nanocrystalline materials
2013 IEEE Electrical Insulation Conference (EIC), 2013Very 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 +3 more
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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 +5 more
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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 +5 more
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A Trigger Integrated VFTO Full Bandwidth Measurement System Based on Impedance Converter
IEEE International Conference on High Voltage Engineering and Application, 2022Accurate 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 +6 more
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Transient modeling and analysis of transformer windings under VFTO
2008 7th World Congress on Intelligent Control and Automation, 2008Calculation 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 +4 more
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