Interruption Capability of Gases and Gas Mixtures in a Puffer-Type Interrupter

Lee, A.; Frost, L. S.

doi:10.1109/tps.1980.4317341

Cited by 43 publications

(12 citation statements)

References 3 publications

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“…SF 6 is one of the most potent greenhouse gases in view of its global warming potential (GWP) as high as 228,000 with respect to CO 2 over a hundred years time horizon and lasts up to 3200 years in the atmosphere because of its chemical stability . Therefore, considerable efforts have been made to look for alternative insulation gases . Nevertheless, no single gas could be identified that was superior to SF 6 in all aspects even though numerous gases (e.g., c‐C 4 F 8 , CF 3 I) have been examined tentatively for replacement of SF 6 …”

Section: Introductionmentioning

confidence: 99%

“…[2,3] Therefore, considerable efforts have been made to look for alternative insulation gases. [4][5][6][7][8][9] Nevertheless, no single gas could be identified that was superior to SF 6 in all aspects even though numerous gases (e.g., c-C 4 F 8 , CF 3 I) have been examined tentatively for replacement of SF 6 . [10,11] Only gas mixtures such as synthetic air and SF 6 /N 2 are successfully applied as SF 6 alternatives in practice.…”

Section: Introductionmentioning

confidence: 99%

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Prediction on dielectric strength and boiling point of gaseous molecules for replacement of SF₆

Hou

Wang

2017

J Comput Chem

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Developing the environment-friendly insulation gases to replace sulfur hexafluoride (SF ) has attracted considerable experimental and theoretical attentions but without success. A computational methodology was presented herein for prediction on dielectric strength and boiling point of arbitrary gaseous molecules in the purpose of molecular design and screening. New structure-activity relationship (SAR) models have been established by combining the density-dependent properties of the electrostatic potential surface, including surface area and the statistical variance of the surface potentials, with the molecular properties including polarizability, electronegativity, and hardness. All the descriptors in the SAR models were calculated using density functional theory. The substitution effect of SF by various functional groups was studied systematically. It was found that CF is the most effective functional group to improve the dielectric strength due to the large surface area and polarizability. However, all the substitutes exhibit higher boiling points than SF because the molecular hardness decreases. The balance between E and T could be achieved by minimizing the local polarity of the molecules. SF CN and SF CFO were found to be the potent candidates to replace SF in view of their large dielectric strengths and low boiling points. © 2017 Wiley Periodicals, Inc.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Prediction on dielectric strength and boiling point of gaseous molecules for replacement of SF₆

Hou

Wang

2017

J Comput Chem

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“…They found that the SF 6 /N 2 mixture has the highest critical breakdown field strength. Lee et al [13] studied the breakdown characteristics of 40 kinds of gas mixtures. Their results show that the breakdown characteristics of the SF 6 /N 2 mixture are closest to those of pure SF 6 .…”

Section: Introductionmentioning

confidence: 99%

The Development of SF6 Green Substitute Gas

et al. 2021

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Due to its high greenhouse effect, the use of SF6 as the main insulating gas is restricted in the electric power field. Along with the aim of environmental protection, the search for new alternative gases with a lower greenhouse effect and higher insulation strength has received a lot of attention. The properties of alternative gases have a vital impact on the performance of medium-voltage power distribution equipment. Firstly, based on the existing liquefaction temperatures of SF6/N2, SF6/CO2, and SF6/CF4, the calculated liquefaction temperatures were expanded to 0.7 MPa. Combining the Antoine vapor-pressure equation and the basic law of vapor–liquid balance, the vapor pressures of SF6/N2, CF3I/N2, c-C4F8/N2, C4-PFN/N2, C4-PFN/CO2, and C5-PFK/CO2 were obtained. Secondly, the critical breakdown field strength was analyzed for C4-PFN/CO2, C5-PFK/CO2, SF6, CF3I/N2, C5-PFK/Air, and c-C4F8/N2. Finally, the GWPs of SF6/N2, C4-PFN/N2, C4-PFN/CO2, C5-PFK/CO2, and C5-PFK/N2 were discussed. The results show that the liquefaction temperature gradually decreases as the pressure rises; SF6/N2 has the highest vapor pressure at −5 °C; the critical breakdown field strengths of several mixtures are higher than that of SF6.

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“…It is important to find a switching medium with excellent interrupting performance but which is environmentally harmless, as an alternative to SF 6 . Several investigations have been undertaken to study other insulating media in CBs aiming on replacement of SF 6 [3][4][5][6][7]. However, no promising alternative to SF 6 has been found.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of dielectric recovery in supercritical N₂

Zhang

Markosyan

Seeger

et al. 2015

Plasma Sources Sci. Technol.

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A supercritical (SC) nitrogen (N 2 ) switch is designed and tested. The dielectric strength and recovery rate of the SC switch are investigated by experiments. In order to theoretically study the discharge and recovery process of the SC N 2 switch under high repetition rate operation, a numerical model is developed. For SC N 2 with initial parameters of p = 80.9 bar and T = 300 K, the simulation results show that within several nanoseconds after the streamer bridges the switch gap, the spark is fully developed and this time depends on the applied electric field between electrodes. During the whole discharge process, the maximum temperature in the channel is about 20 000 K. About 10 µs after the spark excitation of 200 ns duration, the temperature on the axis decays to T axis 1500 K, mainly contributed by the gas expansion and heat transfer mechanisms. After 100 µs, the dielectric strength of the gap recovers to above half of the cold breakdown voltage due to the temperature decay in the channel. Both experimental and numerical investigations indicate that supercritical fluid is a good insulating medium that has a proved high breakdown voltage and fast recovery speed.

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Interruption Capability of Gases and Gas Mixtures in a Puffer-Type Interrupter

Cited by 43 publications

References 3 publications

Prediction on dielectric strength and boiling point of gaseous molecules for replacement of SF₆

Prediction on dielectric strength and boiling point of gaseous molecules for replacement of SF₆

The Development of SF6 Green Substitute Gas

Numerical and experimental investigation of dielectric recovery in supercritical N₂

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Interruption Capability of Gases and Gas Mixtures in a Puffer-Type Interrupter

Cited by 43 publications

References 3 publications

Prediction on dielectric strength and boiling point of gaseous molecules for replacement of SF6

Prediction on dielectric strength and boiling point of gaseous molecules for replacement of SF6

The Development of SF6 Green Substitute Gas

Numerical and experimental investigation of dielectric recovery in supercritical N2

Contact Info

Product

Resources

About

Prediction on dielectric strength and boiling point of gaseous molecules for replacement of SF₆

Prediction on dielectric strength and boiling point of gaseous molecules for replacement of SF₆

Numerical and experimental investigation of dielectric recovery in supercritical N₂