Development of SF$_{6}$-Free 72.5 kV GIS

Rokunohe, Toshiaki; Yagihashi, Yoshitaka; Aoyagi, Kenji; Oomori, Takashi; Endo, Fumio

doi:10.1109/tpwrd.2007.899273

Cited by 60 publications

(21 citation statements)

References 4 publications

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“…Recently, most of the medium voltage switchgears are cubicle-type low pressure SF6 gas insulated switchgears (C-GIS). However, SF6 gas was designated as one of the targets of emission control in the global warming prevention conference held in 1997 (COP3), then research and development of SF6 gas free systems were actively advanced [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Basic study on surface insulation design of solid/gas composite insulation system with embedded electrode

Yamashita

Iwanaga

Furusato

et al. 2017

IEEE Trans. Dielect. Electr. Insul.

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Solid insulated switchgear (SIS) has been developed as a substitution for medium voltage SF6 gas insulated switchgear. Its main circuits including a vacuum interrupter are coated with epoxy resin and a solid/gas insulation system is formed. For further miniaturization and higher stress design, the authors investigated the surface insulation performance of the solid/gas insulation system containing an embedded electrode. In the previous study, the authors investigated the surface breakdown characteristics. The authors also investigated the surface discharge propagation characteristics and proposed an estimation method of the surface breakdown voltage. In the present study, the authors investigated the surface breakdown characteristics numerically. The calculation was done based on the estimation method proposed previously. The divided voltage ratio, the radius of the embedded electrode, the enhancement factor of the surface insulation strength and the peak value of the surface breakdown voltage are examined. As a result, the characteristics of the parameters and the criteria for the optimum insulation design were clarified.

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Section: Introductionmentioning

confidence: 99%

Basic study on surface insulation design of solid/gas composite insulation system with embedded electrode

Yamashita

Iwanaga

Furusato

et al. 2017

IEEE Trans. Dielect. Electr. Insul.

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show abstract

“…Researchers have identified GN2 as potential substitute for SF6 in gas-insulated switchgear at ambient temperature [13], because N2 is a strong electron slowing-down gas and can self-heal after breakdown [14]. GN2 has the highest dielectric strength among cryogenic gases below 80 K, more than 10 times the strength of GH2 at high pressure (Nvd = 10 24 m −2 ).…”

Section: Potential Dielectrics For Cryogenic Interruptionmentioning

confidence: 99%

Future cryogenic switchgear technologies for superconducting power systems

Saluja

Damle

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…On the other hand, the use of SF 6 should decrease because it was designated as a target for Green House Gas (GHG) emission trading in the Kyoto Protocol in 1997. Because of this background, several studies have been performed to reduce the use of SF 6 gas in electric power systems [2].…”

Section: Introductionmentioning

confidence: 99%

“…Also, the dielectric strength of N 2 :O 2 (contained 40% of O 2 ) gas mixture was about 5% higher than that of dry air. However, the manufacturing cost of dry air is about one-third of that of N 2 :O 2 (contained 40% of O 2 ) gas mixture [2]. In addition, several studies have been conducted on solid-state and vacuum insulated switchgear [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…However, the manufacturing cost of dry air is about one-third of that of N 2 :O 2 (contained 40% of O 2 ) gas mixture [2]. In addition, several studies have been conducted on solid-state and vacuum insulated switchgear [2,3]. Dry air has attracted the most attention as an insulation gas for Eco-friendly Gas Insulated Switchgears (EGIS) [4].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Surface Discharge Characteristics Study on the Laminated Solid Insulator in Quasi-Uniform Electric Field with Dry Air

Min¹,

Bae²,

Kang³

et al. 2015

Journal of Electrical Engineering and Technology

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-Dry air is an excellent alternative to SF 6 gas and is used as an insulation gas in Ecofriendly Gas Insulated Switchgears (EGISs), which has gained popularity in industry. Solid insulators in EGIS play an important role in electrical insulation. On the other hand, surface discharge can occur easily when solid insulators are used. This paper explored the surface discharge characteristics on the structure of three-layered laminated solid insulators to elevate the flashover voltage. A laminated solid insulator was inserted after the quasi-uniform electric field was formed in the test chamber. Dry air was then injected to set the internal pressure to 1 ~ 6 atm, and the AC voltage was applied. When identical solid insulators were stacked, the surface discharge characteristics were similar to those of a single solid insulator. On the other hand, the flashover voltage rose when the middle part was thicker and had lower permittivity than the top and bottom parts in the laminated solid insulator. Based on experimental results, when stacking a solid insulator in three layers, the middle part of the solid insulator should be at least four times as thick as the top and bottom parts and have lower permittivity than the others. In addition, the flashover voltage increased with increasing gas pressure on the surface of the laminated solid insulator due to the gas effect. This study may allow insulation design engineers to have useful information when using dry air for the insulation gas where the surface discharge can occur.

show abstract

Development of SF$_{6}$-Free 72.5 kV GIS

Cited by 60 publications

References 4 publications

Basic study on surface insulation design of solid/gas composite insulation system with embedded electrode

Basic study on surface insulation design of solid/gas composite insulation system with embedded electrode

Future cryogenic switchgear technologies for superconducting power systems

Surface Discharge Characteristics Study on the Laminated Solid Insulator in Quasi-Uniform Electric Field with Dry Air

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