Study of the dielectric breakdown properties of CO2–O2 mixtures by considering electron detachments from negative ions

Zhao, Hu; Tian, Zengyao; Deng, Yunkun; Li, Xingwen; Hui, Lin

doi:10.1063/1.4996354

Cited by 11 publications

(13 citation statements)

References 28 publications

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“…Uchii et al [38] pointed out that adding some O 2 to CO 2 can improve its dielectric strength and bring the better thermal interrupting capability to CO 2 . Zhao et al explored the dielectric breakdown properties of CO 2 –O 2 mixtures by considering electron detachments from negative ions [39]. The reduced ionisation coefficient ( α/N ), reduced attachment coefficients ( η/N ), ( E/N ) crit , breakdown reduced electric fields ( E/N ) breakdown was calculated.…”

Section: Resultsmentioning

confidence: 99%

Influence regularity of O ₂ on dielectric and decomposition properties of C ₄ F ₇ N–CO ₂ –O ₂ gas mixture for medium‐voltage equipment

Zhang

et al. 2020

High Voltage

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Fluorinated nitrile (C 4 F 7 N) gas mixture has been introduced as the most promising candidate to replace sulfur hexafluoride using in gas-insulated equipment. In this study, the authors explored the influence of oxygen on the dielectric and decomposition properties of C 4 F 7 N-CO 2-O 2 gas mixture. The authors found that the dielectric strength of the C 4 F 7 N-CO 2-O 2 gas mixture with 2, 4, 6, 8 and 10% O 2 was increased by 4.85%, 6.49%, 7.70%, 3.21% and 2.74% compared with C 4 F 7 N-CO 2. The addition of 2-6% O 2 to the C 4 F 7 N-CO 2 gas mixture could effectively reduce the content of most of the decomposition byproducts such as CF 4 , CO, C 2 F 6 , C 3 F 6 , C 3 F 8 , CF 3 CN, C 2 F 5 CN, (CN) 2. While high content of oxygen (>6%) results in higher decomposition of C 4 F 7 N, which has a negative effect on the stability of C 4 F 7 N gas mixture. Generally, it is recommended to add 2-6% O 2 in the C 4 F 7 N-CO 2 gas mixture to improve its insulation properties as well as inhibit the decomposition of C 4 F 7 N in the discharge for medium-voltage engineering application.

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Section: Resultsmentioning

confidence: 99%

Influence regularity of O ₂ on dielectric and decomposition properties of C ₄ F ₇ N–CO ₂ –O ₂ gas mixture for medium‐voltage equipment

Zhang

et al. 2020

High Voltage

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“…These particles drift in the electric field. The time integral of the measured current I(t) gives the total amount of charge N c that transits through the gap, as shown in equation (5). Each of the initial electrons may cause an ionization event so that an additional positive ion can contribute to the total amount of charge, or cause an attachment event while it gives no contribution to the total amount of charges.…”

Section: Measurement Principlesmentioning

confidence: 99%

“…Besides, the Paris Agreement of 2016 also explicitly calls for zero net greenhouse gas emission in the second half of this century [3,4]. Research on SF 6 alternatives began with some gases that are common in nature such as nitrogen, carbon dioxide and dry air [5][6][7] but their dielectric strength is approximately only a third that of SF 6 . Mixing other gases, such as N 2 [8] and CF 4 [9], into SF 6 to reduce the amount of SF 6 is another alternative, but it cannot get rid of the dependence on SF 6 .…”

Section: Introductionmentioning

confidence: 99%

Electron swarm parameters and dielectric strength of C₅F₁₀O and its mixtures with CO₂ and dry air

Hao¹,

Zhang²,

Li³

et al. 2021

J. Phys. D: Appl. Phys.

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Perfluoroketone C5F10O is considered as a potential SF6 alternative. The GWP (Global warming potential) of C5F10O is extremely low and even close to that of air. We investigated the electrical insulation properties of the C5F10O by pulsed Townsend (PT) experiment. The rate coefficients of ionization, attachment, and effective ionization, as well as the electron drift velocity and the longitudinal electron diffusion coefficient in pure C5F10O were obtained. We conclude that the density-reduced critical electric field of pure C5F10O is (768±5)Td and ion kinetics are not exist or negligible in C5F10O. Furthermore, the swarm parameters of C5F10O /CO2 and C5F10O /Air mixtures with C5F10O percentage up to 30% were measured in a wide E/N-range. C5F10O has good synergism with both CO2 and dry air and air behaves better. The synergistic effect coefficients were also calculated. To have the same (E/N)crit as pure SF6, the mixing ratio of C5F10O should be 30% in the mixture with CO2 and 26% in the mixture with dry air. The obtained electron swarm parameters in this paper provide a supplement for the fundamental data set of these novel gases, and also lay the foundation for fluid model simulations of gas discharge.

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“…Recently, the dielectric properties of O 2 [150], air [150], N 2 -O 2 [152], CO 2 -O 2 [153], hot air [154], and hot CO 2 [155] have been evaluated using this method.…”

Section: 322considering Both Electron Kinetics and Ion Kinetics In Amentioning

confidence: 99%

Fundamental physicochemical properties of SF₆-alternative gases: a review of recent progress

Zhang

Xiong

Chen

et al. 2020

J. Phys. D: Appl. Phys.

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Environmental considerations are increasingly taking a front seat in all arenas of our daily lives. Among the major concerns are greenhouse gases and the resulting global warming problem. Although sulfur hexafluoride (SF6) is the most widely used insulation and arc-interruption medium in electrical power equipment, it is an extremely potent greenhouse gas with a very high global warming potential (GWP). Hence, the global power industry has been actively seeking SF6-alternative gases for decades. In recent years, much progress has been made in developing promising new gases that have dielectric properties similar to, or even better than, SF6 but with much lower GWPs. Many engineering-oriented tests have been performed on the technical performance of these gases and some manufacturers have announced their application in pilot projects. However, their large-scale application still seems premature, in particular because of the lack of some critical fundamental physicochemical information for these relatively novel compounds. To provide a better understanding of these SF6-alternative gases, this paper reviews the recent advances in obtaining their fundamental physicochemical properties, emphasizing basic data calculations and fundamental experiments. The most important properties are analyzed comprehensively. These include the basic physical properties of arc plasmas formed from the gases, decomposition characteristics, materials compatibilities, swarm parameters, cross-sections and some dielectric properties. Finally, perspectives on current research and future research directions are presented.

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Study of the dielectric breakdown properties of CO2–O2 mixtures by considering electron detachments from negative ions

Cited by 11 publications

References 28 publications

Influence regularity of O ₂ on dielectric and decomposition properties of C ₄ F ₇ N–CO ₂ –O ₂ gas mixture for medium‐voltage equipment

Influence regularity of O ₂ on dielectric and decomposition properties of C ₄ F ₇ N–CO ₂ –O ₂ gas mixture for medium‐voltage equipment

Electron swarm parameters and dielectric strength of C₅F₁₀O and its mixtures with CO₂ and dry air

Fundamental physicochemical properties of SF₆-alternative gases: a review of recent progress

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Study of the dielectric breakdown properties of CO2–O2 mixtures by considering electron detachments from negative ions

Cited by 11 publications

References 28 publications

Influence regularity of O 2 on dielectric and decomposition properties of C 4 F 7 N–CO 2 –O 2 gas mixture for medium‐voltage equipment

Influence regularity of O 2 on dielectric and decomposition properties of C 4 F 7 N–CO 2 –O 2 gas mixture for medium‐voltage equipment

Electron swarm parameters and dielectric strength of C5F10O and its mixtures with CO2 and dry air

Fundamental physicochemical properties of SF6-alternative gases: a review of recent progress

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Influence regularity of O ₂ on dielectric and decomposition properties of C ₄ F ₇ N–CO ₂ –O ₂ gas mixture for medium‐voltage equipment

Influence regularity of O ₂ on dielectric and decomposition properties of C ₄ F ₇ N–CO ₂ –O ₂ gas mixture for medium‐voltage equipment

Electron swarm parameters and dielectric strength of C₅F₁₀O and its mixtures with CO₂ and dry air

Fundamental physicochemical properties of SF₆-alternative gases: a review of recent progress