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Insulation Coordination in Gas Insulated Switchgear Against Lightning Overvoltages
1991This paper describes improved models for lightning overvoltage analysis and example results by the models. Reduction of lightning impulse withstand levels for 500 and 275kV gas insulated switchgear substations is recomended. Newly developed high performance metal oxide surge arresters are also presented.
T. Kawamurа, J. Ozawa
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Coupling Devices for the Detection of Partial Discharges in Gas-insulated Switchgear
IEEE Power Engineering Review, 1981Partial discharge in gas-insulated 8witchgear is indicative of serious malfunction and, otten, imminent failure. Partial discharge magnitudes range from zero to about a microcoulomb per pulse. Sources of partial discharge can be detected acoustically, electromagnetically or through gas analysis.
S.A. Boggs, G.L. Ford, R.C. Madge
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Determination of Sensor Position on 150 kV Gas Insulation Switchgear
2019 International Conference on Electrical Engineering and Informatics (ICEEI), 2019Gas insulated switchgear is one of the important equipment in electric power system. Gas insulated switchgear can run into a malfunction that begins with the presence of partial discharge. Various methods have been developed to detect the presence of partial discharge.
Umar Khayam +2 more
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IEEE Transactions on Dielectrics and Electrical Insulation, 2015
This paper presents a comparative study on SF6 alternative candidate gases for the surface insulation performance of eco-friendly Gas Insulated Switchers (GIS) and Solid Insulated Switchers (SIS). The candidate gases including N2/O2 mixture gas, dry air, and compressed air were proposed based on AC surface flashover experiment.
Dong-Young Lim, Sungwoo Bae
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This paper presents a comparative study on SF6 alternative candidate gases for the surface insulation performance of eco-friendly Gas Insulated Switchers (GIS) and Solid Insulated Switchers (SIS). The candidate gases including N2/O2 mixture gas, dry air, and compressed air were proposed based on AC surface flashover experiment.
Dong-Young Lim, Sungwoo Bae
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Influence of Arc-Decomposed SF6 Gas on Cast EPOXY Insulators for Gas Insulated Switchgears
IEEE Transactions on Power Apparatus and Systems, 1979Reactions between arc decomposed gases and cast epoxy insulators used in gas insulated switchgears are very important and interesting phenomena to be investigated for engineers and designers.
Shotaro Tominaga +2 more
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Transient electric field analysis of disk insulator for Gas insulated switchgear
2013 2nd International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST), 2013Fourier transform are used on the very fast transient overvoltage (VFTO) discretion, different spectral components of transient voltage waveform are achieved. The mathematical model of the transient electric field is deduced considering dielectric polarization loss and displacement current.
Zhenxin Geng, Xin Lin, Binge Si
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Breakdown voltage-time characteristics and insulation testing of gas insulated switchgear
IEEE Transactions on Dielectrics and Electrical Insulation, 2008There is not sufficient data on the breakdown voltage-time characteristics for gas insulated swiitchgear (GIS) at power-frequency voltages, especially in the long-term region, for complete insulation specifications to be developed. This paper gives voltage- time breakdown characteristics for a 72-kV GIS at power-frequency voltages, both for clean ...
Shigemitsu Okabe +2 more
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Gas insulated switchgear for medium voltage substations
IEE Colloquium on GIS (Gas-Insulated Switchgear) at Transmission and Distribution Voltages, 1995High reliability and staff safety is the most important factor a modern medium voltage switchgear has to comply with. Together with the requirement for space-saving design, mainly in European countries, the development of switchgear models finally resulted in the most advantageous type of gas insulated switchgear.
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2012 IEEE International Power Modulator and High Voltage Conference (IPMHVC), 2012
An application of a functionally graded material (FGM) to the solid spacer in gas insulated switchgears (GISs) can reduce the electric field intensity. Especially, the location of the high electric field concentration moves from the anode to the interface between the spacer and the gas, when the FGM spacer is used.
Chi-Wuk Gu +3 more
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An application of a functionally graded material (FGM) to the solid spacer in gas insulated switchgears (GISs) can reduce the electric field intensity. Especially, the location of the high electric field concentration moves from the anode to the interface between the spacer and the gas, when the FGM spacer is used.
Chi-Wuk Gu +3 more
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Contact‐failure phenomena and their development in gas‐insulated switchgear
Electrical Engineering in Japan, 1993AbstractTo explain contact failure phenomena and their development in the gas‐insulated switchgear (GIS). tests were conducted by simulating abnormal current‐carrying conditions using an actual 300‐kV, 2000‐A GIS.This paper describes the process observed. ranging from contact failures to ground faults, deteriorative phenomena and some detection methods
Yoku Mukaiyama +5 more
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