Application Problems of SF6/N2 Mixtures to Gas Insulated Bus

Hama, Hiroyuki; Yoshimura, Manabu; Inami, Kiyoshi; Hamano, S.

doi:10.1007/978-1-4615-4899-7_48

Cited by 15 publications

(19 citation statements)

References 3 publications

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“…T he worldwide effort of reducing or even banning SF 6 gas-which has an extremely high global warming potential (GWP)-concerns not only the electric power industry but also other sectors, such as the magnesium and electronics industries. In the electric power industry, gas insulated switchgear (GIS), gas insulated lines (GIL), and gas circuit breakers (GCB) are major apparatus utilizing more or less pressurized pure SF 6 .…”

mentioning

confidence: 99%

“…One of the practical solutions of reducing or minimizing the amount of SF 6 in electric power apparatus is to utilize a pressurized gas mixture, in which a low content of an electronegative gas is mixed with an ordinary gas such as N 2 , CO 2 , or air. The electronegative gas may be SF 6 or one of the hydrofluorocarbons (HFCs) or perfluorocarbons (PFCs).…”

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confidence: 99%

“…In the electric power industry, gas insulated switchgear (GIS), gas insulated lines (GIL), and gas circuit breakers (GCB) are major apparatus utilizing more or less pressurized pure SF 6 . According to recent statistics [1], the cumulative SF 6 sales in the world from 1961 through 1999 amounted to 136,172 metric tons, of which power utilities accounted for 42,530 metric tons.…”

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confidence: 99%

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Recovery of SF/sub 6/ from N/sub 2//SF/sub 6/ gas mixtures by using a polymer membrane

Yamamoto

Takuma

Kinouchi

2002

IEEE Electr. Insul. Mag.

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confidence: 99%

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Recovery of SF/sub 6/ from N/sub 2//SF/sub 6/ gas mixtures by using a polymer membrane

Yamamoto

Takuma

Kinouchi

2002

IEEE Electr. Insul. Mag.

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“…Given this situation, N 2 /SF 6 gas mixtures have started to be studied for use as an insulating gas for high-voltage electric power apparatus [2,3]. This is because N 2 gas has a very low negative load on the global environment and is cheap, and when mixed with SF 6 gas, it has a positive synergism for insulation characteristics [47].…”

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confidence: 99%

A fundamental study on electrical insulation of N₂/SF₆ gas‐insulated electric power apparatus

Sato

Morita

Kikkawa

et al. 2002

Electrical Engineering Japan

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SUMMARYIn this paper, we carried out a case study on fundamental insulation design for the application of N 2 /SF 6 gas mixtures to a 275-kV gas-insulated busbar. First, we investigated the impulse ratio in N 2 /SF 6 gas mixtures and point out that the insulation design might be based on the negative switching impulse voltage in the case of lower SF 6 content. Second, we estimated the tank diameter and SF 6 gas amount with consideration of the electric field strength on conductor surface and temperature rise in gas mixtures. We clarified that the tank diameter at the lower SF 6 content is mainly determined by the electric field strength on the conductor surface and quantified the optimum gas pressure and SF 6 content for a target reduction of SF 6 gas amount.

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“…From this perspective, the study of technology to recover SF 6 gas, and studies on replacement gases using mixtures which include or do not include SF 6 gas are under way [1][2][3][4][5][6][7][8]. In particular, when focusing on SF 6 gas, research on mixtures with N 2 gas or with N 2 /SF 6 gas mixtures which are a main constituent of the atmosphere and do not contribute to global warming are being widely implemented [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Insulation properties of a CO₂/N₂ 50% SF₆ gas mixture in a nonuniform field

Ohtsuka

Nagara

Koumura

et al. 2002

Electrical Engineering Japan

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SUMMARYThis paper describes partial discharge (PD) inception and breakdown voltage characteristics of a CO 2 /N 2 /SF 6 gas mixture in a nonuniform field. These voltage characteristics were investigated with ac high voltage by changing the mixture rate of each gas of CO 2 , N 2 , and SF 6 gas and the gas pressure from 0.1 MPa to 0.6 MPa. It was found that adding a small amount of CO 2 gas into a N 2 /SF 6 mixture causes a drastic increase in the breakdown voltage. For instance, when the mixture rate of SF 6 in N 2 /SF 6 gas mixture is 50%, with the addition of 1% CO 2 the maximum breakdown voltage becomes 1.31 and 1.15 times higher than that of a 50% N 2 /50% SF 6 gas mixture and pure SF 6 gas, respectively. Moreover, those voltage characteristics of a CO 2 /N 2 /SF 6 gas mixture were also investigated by changing the electric field utilization factor as well as by applying positive and negative standard lightning impulse voltages in order to discuss the corona stabilization effect, which seems to be one reason for the drastic increase in the breakdown voltage. These results and breakdown mechanism of the CO 2 /N 2 /SF 6 gas mixture are discussed on the basis of the corona stabilization effect and the dissociation energies of the component gases by observing PD light images, PD light intensities through a blue and red filter, and PD current waveforms.

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Application Problems of SF6/N2 Mixtures to Gas Insulated Bus

Cited by 15 publications

References 3 publications

Recovery of SF/sub 6/ from N/sub 2//SF/sub 6/ gas mixtures by using a polymer membrane

Recovery of SF/sub 6/ from N/sub 2//SF/sub 6/ gas mixtures by using a polymer membrane

A fundamental study on electrical insulation of N₂/SF₆ gas‐insulated electric power apparatus

Insulation properties of a CO₂/N₂ 50% SF₆ gas mixture in a nonuniform field

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Application Problems of SF6/N2 Mixtures to Gas Insulated Bus

Cited by 15 publications

References 3 publications

Recovery of SF/sub 6/ from N/sub 2//SF/sub 6/ gas mixtures by using a polymer membrane

Recovery of SF/sub 6/ from N/sub 2//SF/sub 6/ gas mixtures by using a polymer membrane

A fundamental study on electrical insulation of N2/SF6 gas‐insulated electric power apparatus

Insulation properties of a CO2/N2 50% SF6 gas mixture in a nonuniform field

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A fundamental study on electrical insulation of N₂/SF₆ gas‐insulated electric power apparatus

Insulation properties of a CO₂/N₂ 50% SF₆ gas mixture in a nonuniform field