Holistic evaluation of the performance of today's SF6 alternatives proposals

Kosse, S.; Nikolic, Paul Gregor; Kachelriess, Guenter

doi:10.1049/oap-cired.2017.0819

Cited by 10 publications

(5 citation statements)

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“…Recently, perfluoronitrile(C4PFN)/CO 2 mix ture and perfluoroketone(C5PFK)/CO 2 /O 2 mixture, etc, have been proposed as candidate alternatives to SF 6 [11][12][13][14][15][16][17]. For these candidates, comparisons have been actively researched in current interruption ability and dielectric strength [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Thermal re-ignition processes of switching arcs with various gas-blast using voltage application highly controlled by powersemiconductors

Nakano

Tanaka

Murai

et al. 2018

J. Phys. D: Appl. Phys.

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This paper focuses on a fundamental experimental approach to thermal arc reignition processes in a variety of gas flows in a nozzle. Using power semiconductor switches in the experimental system, the arc current and the voltage applied to the arc were controlled with precise timing. With this system, residual arcs were created in decaying phase under free recovery conditions; arc reignition was then intentionally instigated by application of artificial voltage-i.e. quasitransient recovery voltage-to study the arc behaviour in both decaying and reignition phases. In this study, SF 6 , CO 2 , N 2 , O 2 , air and Ar arcs were intentionally reignited by quasiTRV application at 20 μs delay time from initiation of free recovery condition. Through these experiments, the electron density at the nozzle throat was measured using a laser Thomson scattering method together with high speed video camera observation during the reignition process. Temporal variations in the electron density from the arc decaying to reignition phases were successfully obtained for each gasblast arc at the nozzle throat. In addition, initial dielectric recovery properties of SF 6 , CO 2 , air and Ar arcs were measured under the same conditions. These data will be useful in the fundamental elucidation of thermal arc reignition processes.

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Section: Introductionmentioning

confidence: 99%

Thermal re-ignition processes of switching arcs with various gas-blast using voltage application highly controlled by powersemiconductors

Nakano

Tanaka

Murai

et al. 2018

J. Phys. D: Appl. Phys.

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“…Insulation gases should have the ability to interrupt a large current during the switching operation of the circuit breaker [45,46]. Important gas properties for arc interruption are required.…”

Section: Arc-quenching Capabilitymentioning

confidence: 99%

Green Gas for Grid as an Eco-Friendly Alternative Insulation Gas to SF6: A Review

Pan

Wang²,

Shi

et al. 2020

Applied Sciences

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This paper deals with a review of the state-of-the-art performance investigations of green gas for grid (g3) gas, which is an emerging eco-friendly alternative insulation gas for sulfur hexafluoride (SF6) that will be used in gas-insulated power facilities for reducing environmental concerns. The required physical and chemical properties of insulation gas for high-voltage applications are discussed, including dielectric strength, arc-quenching capability, heat dissipation, boiling point, vapor pressure, compatibility, and environmental and safety requirements. Current studies and results on AC, DC, and lightning impulse breakdown voltage, as well as the partial discharge of g3 gas, are provided, which indicate an equivalent dielectric strength of g3 gas with SF6 after a proper design change or an increase in gas pressure. The switching bus-transfer current test, temperature rise test, and liquefaction temperature calculation also verify the possibility of replacing SF6 with g3 gas. In addition, the use of g3 gas significantly reduces theabovementioned environmental concerns in terms of global warming potential and atmosphere lifetime. In recent years, g3 gas-insulated power facilities, including switchgear, transmission line, circuit breaker, and transformer, have been commercially available in the electric power industry.

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“…The aforementioned C4-FN, C5-FK and HFOs [12][13][14][15][20][21][22][23] are artificially produced fluorinated gases. However, electric power equipment manufacturers have recently released a joint statement with the aim of developing electrical transmission and distribution equipment that is completely free of fluorinated gases to attain a more sustainable future [24].…”

Section: Introductionmentioning

confidence: 99%

High-temperature properties of dry air used as arc quenching medium and its mixture with vaporized C2F4 : reaction products and critical reduced electric field strength at 300–3000 K

Yokomizu,

Kodama,

Yamamoto

et al. 2024

J. Phys. D: Appl. Phys.

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Recently, electric power equipment manufacturers released a joint statement to develop high-voltage electrical equipment completely free of fluorinated gases as fluoroketones and fluoronitriles, which are considered as alternatives to SF6 , are artificially produced compounds of F.  This paper considers air as a typical gas present naturally in the environment to investigate its high-temperature properties, including an air mixture with C2F4 vapor injected from a polytetrafluoroethylene nozzle, for application as an arc quenching medium in a high-voltage circuit breaker equipped with a nozzle. Chemical composition results for revealing reaction products at 3000-300 K show that the admixture of C2F4 vapor causes a decrease in the molar number of O2 contained in air, owing to the production of O-containing compounds such as CO2 and CO. Additionally, the results reveal that the admixture of C2F4 vapor lead to the production of CF4 as the predominant F-containing compound. Furthermore, the boundary condition for O2 production in terms of O2 molar number X O2 and C2F4 molar number X C2F4 is formulated.  Such evaluation of the mixture composition enables the determination of a reduced effective collision ionization coefficient λ/N and a critical reduced electric field strength E/N, resulting in λ/N=0. The strength E/N for the mixture with 30-100% C2F4 molar fraction rises to approximately 150 Td (1 Td=10-21 V m2 over 3000-300 K, which is 20-50 Td higher than that for high-temperature air unmixed with C2F4 vapor. The variation in E/N is discussed in terms of predominant electron impact processes and an electron energy distribution function in the mixture.

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Holistic evaluation of the performance of today's SF6 alternatives proposals

Cited by 10 publications

References 0 publications

Thermal re-ignition processes of switching arcs with various gas-blast using voltage application highly controlled by powersemiconductors

Thermal re-ignition processes of switching arcs with various gas-blast using voltage application highly controlled by powersemiconductors

Green Gas for Grid as an Eco-Friendly Alternative Insulation Gas to SF6: A Review

High-temperature properties of dry air used as arc quenching medium and its mixture with vaporized C2F4 : reaction products and critical reduced electric field strength at 300–3000 K

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