Partial discharge and breakdown mechanisms in ultra-dilute SF<sub>6</sub>and PFC gases mixed with N<sub>2</sub>gas

Ōkubo, H.; Yamada, T.; Hatta, Kazumi; Hayakawa, Naoki; Yuasa, Sadayuki; Okabe, S.

doi:10.1088/0022-3727/35/21/311

Cited by 46 publications

(19 citation statements)

References 11 publications

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“…Intense research on PFCs started in the early 80s. Thus, many contributions can be found concerning the characteristics of C 3 F 8 (and other PFCs) on the molecular level [18,19,20,21,22,23,24,25,26,27] and on the phenomenological level [16,28,29,30]. Although C 3 F 8 was proposed as replacement candidate in several contributions, it still has a high global warming potential compared to CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Partial discharges and breakdown in C₃F₈

Koch¹,

Franck²

2014

J. Phys. D: Appl. Phys.

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Abstract. Traditional search processes of gases or gas mixtures for replacing SF 6 involve time consuming measurements of partial discharges and breakdown behaviour for several voltage waveforms and different field configurations. Recently a model for prediction of this behaviour for SF 6 was described in literature. The model only requires basic properties of the gas such as the critical field strength and the effective ionization coefficient, which can be obtained by swarm parameter measurements, and thermodynamic properties, which can be calculated. In this paper, we show for the well-known and electronegative gas octafluoropropane (C 3 F 8 ) that it is possible to transfer the model developed for SF 6 to this gas to describe the breakdown behaviour of C 3 F 8 . Thus the model can be beneficial in the screening process of new insulation gases.

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Section: Introductionmentioning

confidence: 99%

Partial discharges and breakdown in C₃F₈

Koch¹,

Franck²

2014

J. Phys. D: Appl. Phys.

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“…In this study, effective ionization coefficients, electron drift velocities and longitudinal diffusion coefficients for ultradilute SF 6 + N 2 mixtures [9,15,16] used in (2) and (3) are presented in Figures 2, 3 and 4, respectively, as a function of E/N in Townsend (Td). Here, E is the electric field intensity, N is the number density and finally, 1 Townsend (Td) is 10 -21 V m 2 .…”

Section: Simulationmentioning

confidence: 99%

“…Its global warming potential is estimated to be 25,000 times larger than that of CO 2 gas [1]. Thus, research on alternative gases for electrical insulation with a lower environmental impact is essential to replace SF 6 [2]. Currently, one of the most important alternatives to pure SF 6 seems to be gaseous mixtures with SF 6 .…”

Section: Introductionmentioning

confidence: 99%

Calculation of partial discharge inception voltages in ultradilute SF<inf>6</inf> + N<inf>2</inf> gas mixtures

Duzkaya

Dincer

Hiziroglu

2009

2009 IEEE Conference on Electrical Insulation and Dielectric Phenomena

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This study proposes a method of calculation to estimate partial discharge inception voltages in ultradilute SF 6 +N 2 gas mixtures. The method is based on the condition necessary for the initial streamer to propagate in a gap where the electric field distribution is highly non-uniform. The proposed method utilizes the finite element method (FEM) in determining the electric fields in ultradilute SF 6 +N 2 gas mixtures. The analysis is applied for rod-plane gaps. Since the average errors are less than 5%, it is recommended to use the proposed simulation model to predict partial discharge inception voltages in ultradilute SF 6 +N 2 gas mixtures.

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“…The researches of SF 6 gas mixtures have been started since 1970s, but most studies focused on the low voltage grade and the steady state breakdown characteristic of gas mixtures [7,8]. That is to say, the research on breakdown characteristic of gas mixtures under high voltage grade and lightning impulse has been a rare occurrence.…”

Section: Introductionmentioning

confidence: 99%

The reversal of SF₆/N₂ gas mixtures polarity effect under lightning impulse

Guo

Zhang

et al. 2015

2015 IEEE 11th International Conference on the Properties and Applications of Dielectric Materials (ICPADM)

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In recent years, SF 6 /N 2 gas mixture gains much popularity as an alternative insulating medium of pure SF 6 gas among gas-insulated equipment because of the greenhouse effect and poor economy effectiveness of the latter. This paper investigated the breakdown characteristics of SF 6 /N 2 gas mixture with low SF 6 mixing ratio in slightly non-uniform electric field which is similar to the gas-insulated metal-enclosed transmission line (GIL) under positive and negative lightning impulse, and the reversal of the polarity effect was found. The research indicates that the breakdown voltage under negative lightning impulse is higher than that under positive lightning impulse in low gas pressure, but when pressure exceeds a critical value, the result converses. The rise of SF 6 mixing ratio will lead to the decrease of the critical value of gas pressure. The result is significant for guiding the application of the electric power equipment with SF 6 /N 2 gas mixtures such as GIL, and it also plays a vital role in the future study of gas discharge mechanism of SF 6 /N 2 gas mixtures.Keywords-SF 6 /N 2 gas mixtures; polarity effect; lightning impulse; slightly non-uniform electric field; critical value.

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Partial discharge and breakdown mechanisms in ultra-dilute SF₆and PFC gases mixed with N₂gas

Cited by 46 publications

References 11 publications

Partial discharges and breakdown in C₃F₈

Partial discharges and breakdown in C₃F₈

Calculation of partial discharge inception voltages in ultradilute SF<inf>6</inf> + N<inf>2</inf> gas mixtures

The reversal of SF₆/N₂ gas mixtures polarity effect under lightning impulse

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Partial discharge and breakdown mechanisms in ultra-dilute SF6and PFC gases mixed with N2gas

Cited by 46 publications

References 11 publications

Partial discharges and breakdown in C3F8

Partial discharges and breakdown in C3F8

Calculation of partial discharge inception voltages in ultradilute SF<inf>6</inf> &#x002B; N<inf>2</inf> gas mixtures

The reversal of SF6/N2 gas mixtures polarity effect under lightning impulse

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Partial discharge and breakdown mechanisms in ultra-dilute SF₆and PFC gases mixed with N₂gas

Partial discharges and breakdown in C₃F₈

Partial discharges and breakdown in C₃F₈

Calculation of partial discharge inception voltages in ultradilute SF<inf>6</inf> + N<inf>2</inf> gas mixtures

The reversal of SF₆/N₂ gas mixtures polarity effect under lightning impulse