Results 161 to 170 of about 452 (193)

Research on Influencing Factors of Very Fast Transient Overvoltage in EHV GIS

2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE), 2020
The influence factors of VFTO when the disconnector operating of GIS are obtained, the methods of suppressor VFTO of UHV GIS are put forward. based on construction and operating mode of 550kV GIS VFTO at different operating mode are calculated, the effects of VFTO on transformer insulation, the breaker capacitance, residual charge voltage and bus wave ...
Ruming Feng, Chuanqiang Che, Jianli Zhao, Qiong Wang, Lei Zhao, Wenliang Yang   +5 more
openaire   +1 more source

Measurement of Very Fast Transient Overvoltages in Current Transformers at Open Air HV Substations

2021 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2021
Very fast transient overvoltages appear when switches operate in high voltage networks. In some cases, they can affect near current transformers (CT). In this paper, a new methodology for measuring these transients is proposed. It uses the stray capacitance of the CT between its high voltage winding and all other parts at ground potential.
Daniel Slomovitz, Marcelo Brehm, Rogelio Sandler, Carlos Faverio, Leonardo Trigo, Alejandro Santos, Gonzalo Aristoy   +6 more
openaire   +1 more source

Modeling of Transformer Windings Under Very Fast Transient Overvoltages

IEEE Transactions on Electromagnetic Compatibility, 2006
To calculate the overvoltages in transformer windings under very fast transient overvoltages (VFTOs) generated by switching operations in gas-insulated substation (GIS), a single-input and multiple-output circuit model, which is based on a multiconductor transmission line (MTL) model, is presented in this paper.
Guishu Liang, Haifeng Sun, Xile Zhang, Xiang Cui   +3 more
openaire   +1 more source

Study of very fast transient overvoltages in air‐cored pulsed transformers

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 2012
PurposeThe purpose of this paper is to study very fast transient overvoltages (VFTOs) in the secondary winding of air‐cored Tesla transformers and also study the resulting electric field stresses.Design/methodology/approachAn exhaustive model based on Multi‐conductor Transmission Lines (MTLs) theory has been used. The governing telegraphist's equations
E. Agheb, E. Hashemi, S.A. Mousavi, H.K. Hoidalen   +3 more
openaire   +1 more source

Aging characteristics of epoxy resin discharged by very fast transient overvoltage in SF6

IEEE Transactions on Dielectrics and Electrical Insulation, 2017
Qing Xie, Kexin Fu, Cheng Zhang
exaly   +2 more sources

Analysis of resonance in transformer windings under very fast transient overvoltages

2006 17th International Zurich Symposium on Electromagnetic Compatibility, 2006
To study the resonance in transformer windings, under very fast transient overvoltages (VFTOs) generated by switching operations in gas insulated substation (GIS), a single input and multiple output circuit model is presented in this paper which is based on multi-conductor transmission line (MTL) model of transformer windings.
null Haifeng Sun, null Guishu Liang, null Xile Zhang, null Xiang Cui   +3 more
openaire   +1 more source

Failure Mechanism of the Thyristor Under Very Fast Transient Overvoltage Conditions

IEEE Transactions on Power Electronics
Zhonghao Dongye, Jiayu Fan, Lei Qi
exaly   +2 more sources

Statistical law for parameters of very fast transient overvoltage in UHV substations

2016 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC), 2016
Very fast transient overvoltage (VFTO) generated by switching of disconnector in UHV substations may exceed the lightning impulse withstand voltage (LIWV), which is a serious threat to the electric power system. In this paper, five UHV substations in operation or under construction have been modeled in EMTP-ATP, and four operation modes are considered ...
null Zihao Zhang, null Huamao Zhan, null Yuhui Ma   +2 more
openaire   +1 more source

Measurement system for very fast transient overvoltages in gas insulated switchgear

2013 IEEE Electrical Insulation Conference (EIC), 2013
During switching operations of disconnectors in a gas insulated switchgear (GIS) several pre- or restrikes occur between the switching contacts. Thereby steep voltage rises get initiated and propagate inside the GIS. For the measurement of these very fast transient overvoltages (VFTO) a capacitive high voltage measurement system with an analog ...
S. Burow, W. Kohler, S. Tenbohlen, U. Straumann   +3 more
openaire   +1 more source

A New Substitution Waveform of Very Fast Transient Overvoltage in GIS

2012
So far there is no standard waveform of very fast transient overvoltage. Considering the amplitude, frequency and frequency weighted from a great deal of data and according to IEC 61321-1, an accurate substitution waveform of very fast transient overvoltage is presented by means of probability statistical and time–frequency analysis technique ...
Huaying Dong, Guishu Liang, Xixiao Liu, Haifeng Sun, Xintong Yang, Xin Liu   +5 more
openaire   +1 more source