Synergistic effect of SF<sub>6 </sub> and N<sub>2</sub> gas mixtures on the dynamics of electrical breakdown

Osmokrović, P.; Stojkanovic, M.; Stanković, Koviljka; Vujisić, Miloš; Kovačević, Dragan

doi:10.1109/tdei.2012.6180263

Cited by 36 publications

(10 citation statements)

References 31 publications

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“…The synergistic effect of SF 6 /N 2 gas mixture breakdown voltage is a vital evaluation index to the application of insulating medium in electric power system [9]. The synergistic effect coefficient has been widely used to analyze the degree of synergistic effect in existing investigations [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A method for synergistic effect evaluation of SF₆/N₂gas mixtures

Guo

Zhang

Wen

2016

IEEE Trans. Dielect. Electr. Insul.

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A new method was introduced to evaluate and analyze synergistic effect including negative synergistic effect of SF 6 /N 2 gas mixtures breakdown voltage. This method provides an intuitional comparison among different degree of synergistic effect through a simple equation of the normalization coefficient h. The disadvantages of traditional method, which fails to evaluate negative synergistic effect and would be inaccurate when breakdown voltages of the two gas compositions are close, are overcome via the method. In this paper, a typical example of the above is shown to analyze synergistic effect and abnormal negative synergistic effect of SF 6 /N 2 gas mixtures in non-uniform electric field under lightning impulse. Meanwhile the validity of the normalization coefficient h with the synergistic effect of SF 6 /N 2 gas mixtures under various voltage conditions and electrodes in references was verified.

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Section: Introductionmentioning

confidence: 99%

A method for synergistic effect evaluation of SF₆/N₂gas mixtures

Guo

Zhang

Wen

2016

IEEE Trans. Dielect. Electr. Insul.

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“…Nonetheless, SF 6 is a potent greenhouse gas. With the rapid increase in the amount of SF 6 , its impact on the environment is growing. In 1997, SF 6 has already been listed as one of gases which need to be controlled in the Kyoto Protocol [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…In 1997, SF 6 has already been listed as one of gases which need to be controlled in the Kyoto Protocol [1,2]. In addition to the environmental aspects, SF 6 has high sensitivity to the electric field non-uniformity, i.e., with the increase of electric field non-uniformity, the insulation strength of SF 6 drops rapidly. Moreover, SF 6 gas is expensive, if SF 6 gas was used in Gas Insulated Metal-enclosed Transmission Lines (GIL) as insulating medium, its economy effectiveness will be discounted.…”

Section: Introductionmentioning

confidence: 99%

“…The critical breakdown electrical field strength of binary gas mixtures is different from that of the single gas, and it is divided into four types, respectively is: linear relationship, synergistic effect, positive synergistic effect and negative synergistic effect [5]. SF 6 /N 2 and SF 6 /CO 2 gas mixtures which both appear the synergistic effect are the main objects in the recent researches [6]. Because that N 2 has the great chemical stability, no pollution, and as the main components in the atmosphere, is easy to be prepared, SF 6 /N 2 gas mixture has the best application prospect.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, SF 6 /N 2 gas mixtures has been applicated in electric power equipment such as GIL and GIS, but the content of SF 6 in GIL is low, usually within 5%~30%. The corresponding research on SF 6 /N 2 gas mixtures which has low content of SF 6 is still rare, so it has great research prospect. SF 6 /N 2 gas mixtures as synergistic effect gas mixtures, its studies on synergistic effect influenced by the voltage polarity, mixing ratio, pressure and other factors have no definite results.…”

Section: Introductionmentioning

confidence: 99%

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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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