Results 161 to 170 of about 1,585 (211)

Research on VFTO Simulation Analysis of 1000 kV GIS Test Circuit Considering Dynamic Arcing Model

IEEE transactions on industry applications, 2022
In the research process of very fast transient overvoltage (VFTO), the accuracy of the switching arc model largely determines the calculation results of VFTO.
Yanze Zhang, Xiaoyue Chen, Han-Guo Cui, J. Si, Zeyu He, B. Wan, Min Dai, Lei Wang, Jianben Liu   +8 more
semanticscholar   +1 more source

Analysis of VFTO in 1000kV GIS

2020 6th Global Electromagnetic Compatibility Conference (GEMCCON), 2020
With 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.
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

Study on influence of lightning arrester configuration on VFTO in 420kv GIS substation overvoltage in 420kv GIS substation transformation project

Other Conferences, 2023
Lightning impulse overvoltage is the main factor to determine the insulation level of substation, and the insulation coordination between the insulation level of the protected electrical equipment and the arrester of the protection device is the most ...
Ruming Feng, Chuanqiang Che, Zhikai Zhai, Qiang Xu, Lei Zhao, J. Bai, Taowei Liu, Zheng Kou, Jiali Chong   +8 more
semanticscholar   +1 more source

Study on the transient characteristics of 1100kV VFTO

2017 4th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST), 2017
The 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, Zhou Fan, Wu Shipu, Cheng Shimin, Reem A. Almenweer   +4 more
openaire   +1 more source

Research of VFTO in 110kV minimized GIS

2015 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT), 2015
110kV 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
openaire   +1 more source

Design of Triggering Device for VFTO Measurement System

Advanced Materials Research, 2012
Very 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, Yu Rong Jia, Jia Xi He, Wei Dong Liu   +3 more
openaire   +1 more source

Research on VFTO Characteristics of Substation using GIL-GIS-oil/SF6 Bushing Structure

IEEE International Conference on High Voltage Engineering and Application, 2022
GIL 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
semanticscholar   +1 more source

Implementation of Radiation and Soil Losses in VFTO Simulation by Frequency-Domain TL Model

IEEE Transactions on Power Delivery, 2022
Transmission 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, Weijiang Chen, Kejie Li, K. Bian, Jiangong Zhang, Tao Wen, Zihan Teng   +6 more
semanticscholar   +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