Results 111 to 120 of about 889 (166)

Regional Evaluation Study of VFTO Interference to Secondary Side Cables Based on Cloud Model and MARCOS

IEEE Transactions on Neural Networks and Learning Systems, 2023
With the advent of the data era, most power secondary side equipment tends to be digitized. The power system needs more accurate numerical results to further improve its operating efficiency.
Yongji Wu, Wei Yan, Puliang Du, Xiaomin Gong, Mengxia Zhou   +4 more
semanticscholar   +1 more source

Modelagem, Simulação e Análise de Sobretensões de Frentes Muito Rápidas (VFTO) na Operação de Transformadores em Subestações Isoladas (GIS)

2023 XV Brazilian Conference on Quality of Power (CBQEE), 2023
ResumoEste trabalho tem por objetivo apresentar os resultados obtidos através do estudo de sobretensões transitórias de frequências elevadas (VFTO), associadas às manobras de chaves seccionadoras e disjuntores no sistema elétrico de uma subestação ...
Jesus Daniel de Olivera, Nelson Clodoaldo de Jesus, Willian Souza de Jesus, Adriano Garufe Nogueira, Mateus Albuquerqui de Oliveira, P. Nunes   +5 more
semanticscholar   +1 more source

The Study of VFTO Distribution in the Insulation System of IOCT

Information Security Practice and Experience, 2023
The FDS of oil-immersed insulation paper and semi-conductive paper with different moisture content has been measured. The data measured are fitted as a function of frequency and moisture content using the amendatory Cole-Cole model by means of least ...
Qingdan Huang, Haoyong Song, Yuqing Chen, Huihong Huang, Yong Wang   +4 more
semanticscholar   +1 more source

Whole Process Simulation of VFTO Coupling to Power Transformer Core Earthing Conductor

Information Security Practice and Experience, 2023
During the field practice, it was found that, the Very Fast Transient Overvoltage (VFTO) intruding into transformer will couple the corresponding VFTO signal on core earthing conductor, which provides a new way to detect VFTO impulse.
Xuezhi Ke, Zuo Yan, Zhaohui Li, Yang Peng, Xuejun Ma, Bailin Li   +5 more
semanticscholar   +1 more source

Study on VFTO in UHV GIS substation

2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT), 2011
In 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
openaire   +1 more source

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

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

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 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