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Pollock, H. C.; Cooper, Franklin S.

doi:10.1103/physrev.56.170

Cited by 42 publications

(6 citation statements)

References 6 publications

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“…Thus, within a specific range of the experimental parameters (including operating gas pressure), the breakdown voltage increases faster than the corona ignition voltage; the difference between these two voltages provides the corona stabilised regime of operation. However, in some cases, with an increase in the gas pressure above a specific value, the breakdown voltage saturates or even decreases, [26], [38]. As a result, the difference between the corona ignition and breakdown voltages reduces or disappears completely (no corona stabilization regime).…”

Section: Discussionmentioning

confidence: 99%

“…However, previously published data can be used to compare the behaviour of the breakdown voltage of SF6 with that of other gases. In [26], for example, the spark breakdown voltage for different gases -including SF6 and airwas obtained as a function of the gas pressure in a point -sphere electrode topology with the field non-uniformity coefficient,   1/5. The positive breakdown voltage of SF6 has its maximum value, Vbr-max, at a pressure of  5.5 bar; at  6.5 bar, Vbr drops by  38% from its peak value and becomes only  2fold higher than that of air.…”

Section: Self-breakdown Voltagesmentioning

confidence: 99%

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Breakdown Characteristics of Plasma Closing Switch Filled With Air, N₂, CO₂, and Ar/O₂

Yao

Timoshkin

MacGregor

et al. 2018

IEEE Trans. Plasma Sci.

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One of the critical components of high energy density pulsed power systems used to generate short high-voltage and high-power impulses is gas-filled plasma closing switch. In recent years significant research efforts have been aimed at finding environmentally friendly gases which can be used in the plasma closing switches, and several gases including dry air, nitrogen, carbon dioxide, argon and their mixtures have been considered as potentially suitable working fluids in such switches. However, the lack of knowledge of the breakdown characteristics of complex switching topologies filled with these gases limits their practical applications. Therefore, further investigation of the breakdown performance of plasma closing switches is required, in order to establish their applicability for practical use in high voltage pulsed power systems. The present paper reports on the investigation of the breakdown characteristics of a triggered plasma closing switch topology with corona discharge electrodes. The self-breakdown voltage of the switch, variation in the self-breakdown voltage, time to breakdown, and jitter have been obtained for the switch filled with "Zero Grade" air, N2, CO2 and an Ar/O2 mixture up to a pressure of 10 bar (abs). It was shown that the switch can provide a stable breakdown performance with jitter as low as 1 ns.

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Section: Discussionmentioning

confidence: 99%

Section: Self-breakdown Voltagesmentioning

confidence: 99%

Breakdown Characteristics of Plasma Closing Switch Filled With Air, N₂, CO₂, and Ar/O₂

Yao

Timoshkin

MacGregor

et al. 2018

IEEE Trans. Plasma Sci.

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“…The excellent arc quenching capability is because of its high heat capacity, dissociation, and reassembly properties. The high dielectric strength can be attributed to its large molecular weight, complexity, and electron affinity, which affects the reaction between gas molecules and free electrons [4]. The decomposed products of SF 6 can recompose again when the temperature decreases, which ensures that the insulation strength is maintained well.…”

Section: Introductionmentioning

confidence: 99%

Alternative Environmentally Friendly Insulating Gases for SF6

Wang¹,

Huang²,

Liu³

et al. 2019

Processes

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Sulfur hexafluoride (SF6) shows excellent insulation performance as an insulating gas. It is suitable for various climate conditions due to its low boiling point (−64 °C). Therefore, it has been widely used in power grid equipment. However, its global warming potential (GWP) is 23,500 times higher than that of CO2. Thus, it is imperative to find an environmentally friendly insulating gas with excellent insulation performance, lower GWP, and which is harmless to equipment and workers to replace SF6. In this review, four possible alternatives, including perfluorocarbons, trifluoroiodomethane, perfluorinated ketones, and fluoronitrile are reviewed in terms of basic physicochemical properties, insulation properties, decomposition properties, and compatibility with metals. The influences of trace H2O or O2 on their insulation performances are also discussed. The insulation strengths of these insulating gases were comparable to or higher than that of SF6. The GWPs of these insulating gases were lower than that of SF6. Due to their relatively high boiling point, they should be used as a mixture with buffering gases with low boiling points. Based on these four characteristics, perfluorinated ketones (C5F10O and C6F12O) and fluoronitrile (C4F7N) could partially substitute SF6 in some electrical equipment. Finally, some future needs and perspectives of environmentally friendly insulating gases are addressed for further studies.

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“…In the 1930-40s dielectric properties of various potential insulation gases including SF 6 were experimentally determined. 2,3,29,[36][37][38][39] It has been speculated upon the reasons for their relatively high electric strength that crucial factors are the large molecular weight, complexity and electron affinity, since they affect the interaction between free electrons and gas molecules. More elementary studies by F. M. Penning pointed out that the development of an electron avalanche is suppressed in gases of small first Townsend coefficient (nowadays known as effective ionization coefficient), which quantifies the electron multiplication in an electron avalanche by electron impact.…”

mentioning

confidence: 99%

Assessment of Eco-friendly Gases for Electrical Insulation to Replace the Most Potent Industrial Greenhouse Gas SF₆

Rabie

Franck

2018

Environ. Sci. Technol.

278

128

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Gases for electrical insulation are essential for the operation of electric power equipment. This Review gives a brief history of gaseous insulation that involved the emergence of the most potent industrial greenhouse gas known today, namely sulfur hexafluoride. SF paved the way to space-saving equipment for the transmission and distribution of electrical energy. Its ever-rising usage in the electrical grid also played a decisive role in the continuous increase of atmospheric SF abundance over the last decades. This Review broadly covers the environmental concerns related to SF emissions and assesses the latest generation of eco-friendly replacement gases. They offer great potential for reducing greenhouse gas emissions from electrical equipment but at the same time involve technical trade-offs. The rumors of one or the other being superior seem premature, in particular because of the lack of dielectric, environmental, and chemical information for these relatively novel compounds and their dissociation products during operation.

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The Effect of Pressure on the Positive Point-to-Plane Discharge inN2,O2

Cited by 42 publications

References 6 publications

Breakdown Characteristics of Plasma Closing Switch Filled With Air, N₂, CO₂, and Ar/O₂

Breakdown Characteristics of Plasma Closing Switch Filled With Air, N₂, CO₂, and Ar/O₂

Alternative Environmentally Friendly Insulating Gases for SF6

Assessment of Eco-friendly Gases for Electrical Insulation to Replace the Most Potent Industrial Greenhouse Gas SF₆

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The Effect of Pressure on the Positive Point-to-Plane Discharge inN2,O2

Cited by 42 publications

References 6 publications

Breakdown Characteristics of Plasma Closing Switch Filled With Air, N2, CO2, and Ar/O2

Breakdown Characteristics of Plasma Closing Switch Filled With Air, N2, CO2, and Ar/O2

Alternative Environmentally Friendly Insulating Gases for SF6

Assessment of Eco-friendly Gases for Electrical Insulation to Replace the Most Potent Industrial Greenhouse Gas SF6

Contact Info

Product

Resources

About

Breakdown Characteristics of Plasma Closing Switch Filled With Air, N₂, CO₂, and Ar/O₂

Breakdown Characteristics of Plasma Closing Switch Filled With Air, N₂, CO₂, and Ar/O₂

Assessment of Eco-friendly Gases for Electrical Insulation to Replace the Most Potent Industrial Greenhouse Gas SF₆