Results 151 to 160 of about 452 (193)

Investigation of very fast transient overvoltage distribution in taper winding of tesla transformer

IEEE Transactions on Magnetics, 2006
In order to study the very fast transient overvoltage (VFTO) distribution in the taper winding of a tesla transformer under high-frequency steep-fronted voltage surge, we built a distributed line model based on multiconductor transmission line (MTL) theory.
Ruan Jiangjun
exaly   +2 more sources

Computation of Very Fast Transient Overvoltages in Transformer Windings

IEEE Power Engineering Review, 2002
The paper deals with the computation of very fast transient overvoltages (VFTO) in transformer windings. For this purpose an algorithm is developed. The applied algorithm uses a hybrid model, which is a combination of the multi-conductor transmission line model (MTLM) and the single-transmission line model (STLM).
Popov, M. (author), van der Sluis, L. (author), Paap, G.C. (author), De Herdt, H. (author)   +3 more
openaire   +2 more sources

Calculation of Very Fast Transient Overvoltages in GIS

2005 IEEE/PES Transmission & Distribution Conference & Exposition: Asia and Pacific, 2005
This paper refers to 500 kV gas insulated substation (GIS) of the Tian Huangping pumped storage power station in East China power system. With the current electro-magnetic transient program (EMTP) in world, we simulate and calculate the very fast transient overvoltages (VFTO) caused by operating of disconnect switch (DS), and the factors that ...
Tiechen Lu, Bo Zhang
openaire   +1 more source

Effects of very fast transient overvoltages on transformer

IEE Proceedings - Generation, Transmission and Distribution, 1999
An analytical solution is found using the Laplace transform to describe the very fast transient overvoltage (VFTO) in the gas insulated switchgear (GIS) connected directly to a transformer. The oscillation frequencies, and other properties, are explicitly given in terms of system parameters. The magnitude of VFTO at the transformer is suppressed due to
Y. Shibuya, S. Fujita, T. Shimomura
openaire   +1 more source

Effects of the GIS parameters on very fast transient overvoltages

Proceedings of MELECON '94. Mediterranean Electrotechnical Conference, 2002
Although it has been observed that gas insulated substations (GIS) are more reliable than open air substations, there is concern that switching operations performed within GIS at voltage levels higher than 300 kV may result in anomalous failure within GIS and of connected plant.
S.A. Qureshi, T.A. Shami
openaire   +1 more source

Analysis of very fast transient overvoltage in transformer winding

IEE Proceedings - Generation, Transmission and Distribution, 1997
Owing to the operation of disconnector switches, very fast transient overvoltages can generate a voltage oscillation inside power transformers connected to them. A practical method to analyse such oscillations is developed based on multiconductor transmission-line theory.
Y. Shibuya, S. Fujita, N. Hosokawa
openaire   +1 more source

Dynamic Performance of Surge Arrester Under Very Fast Transient Overvoltages

International Journal of Modelling and Simulation, 2006
This paper studies the performance of Metal Oxide Surge Arrester (MOSA) for Gas Insulated Substation (GIS) applications. Few models proposed in the literature are used to describe the dynamic characteristic of the arrester and compared with experimental data to verify their accuracy. As percentage error is lesser in the case of a simplified IEEE model,
P. Valsalal, S. Usa, K. Udayakumar
openaire   +1 more source

Insulation characteristics of GIS spacer for very fast transient overvoltage

IEEE Transactions on Power Delivery, 1996
V-t characteristics of spacer surfaces for VFT were investigated under particle contaminated conditions for gas insulated switchgear (GIS). V-t characteristics for VFT were measured with the particle length, oscillation frequency, amplitude, and damping factor of VFT waveform as parameters. Differences in V-t characteristics for VFT due to variation of
S. Okabe, M. Koto, F. Endo, K. Kobayashi
openaire   +1 more source

Impact of GIS Configuration and Trapped Charge Effects on Very Fast Transient Overvoltage in 400 kV Systems using ATP-EMTP

This paper deals with the very fast transient over-voltage (VFTO) in a 400 kV Gas insulated substation (GIS), with a special focus on the influence of GIS configurations and trapped charge on this overvoltage.
Omar Kherif
exaly   +2 more sources

Very Fast Transient Overvoltages generated by Gas Insulated Substations

2008 43rd International Universities Power Engineering Conference, 2008
Very fast transient overvoltages (VFTO) are caused by disconnector switching operations within a gas insulated substation (GIS). The very fast transient overvoltages contains very high frequency components in the order of several 10psilas of MHz and may cause high frequency oscillations in the transformer windings, leading to possible overstressing of ...
D.S. Pinches, M. A. Al-Tai
openaire   +1 more source