Effect of Temperature on Insulation Properties of SF₆/N₂ Mixed Gas Under AC Voltage

Li, Han; Zheng, Yu; Zhang, Pengfei; Han, Xiancai; Zhou, Wenjun

doi:10.1109/tps.2020.2979805

Cited by 6 publications

(1 citation statement)

References 21 publications

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“…Some literatures have studied the dielectric breakdown properties of mixed gases under different working conditions [4][5][6], but those methods are not suitable for Al-air mixed gas because it needs to be maintained at a high temperature. The theoretical calculation methods of gas discharge characteristics are as follows.…”

Section: Introductionmentioning

confidence: 99%

Dielectric breakdown properties of Al-air mixtures

Cai¹,

Zhang²,

Lu³

et al. 2021

Plasma Sci. Technol.

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In order to investigate the influence of aluminum vapor on the breakdown performance of air, this paper makes a study of the dielectric breakdown characteristics of Al-air mixture in the temperature range of 300–5000 K at atmospheric pressure. A Boltzmann analysis method is used to deal with the electron energy distribution function (EEDF), the reduced ionization coefficients (α/N), the reduced attachment coefficients (η/N) and the critical reduced breakdown strength ((E/N)cr) so as to explore the influence of temperature and mixing ratio on the dielectric breakdown properties. In the temperature range of 300–2000 K, the property of the mixture is mainly determined by the mixing proportion of aluminum vapor because the composition of particles remains unchanged. In the temperature range of 2000–2500 K, the decomposition of Al2O2 leads to the increase of aluminum oxides and NO, and a rise in the percentage of high-energy electrons as well as the increment of α/N. Also, the joint action of O2 and NO makes η/N increase first and then decrease, and (E/N)cr goes down to a smaller temperature range. An increase in the proportion of aluminum vapor causes (E/N)cr to decrease in the low-temperature region and to increase in the high-temperature region, which will reduce the transition between these two temperature regions.

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Section: Introductionmentioning

confidence: 99%

Dielectric breakdown properties of Al-air mixtures

Cai¹,

Zhang²,

Lu³

et al. 2021

Plasma Sci. Technol.

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Research on the Temperature Rise Characteristics ofMedium‐VoltageSwitchgear under Different Operation Conditions

Zhao

Huang

et al. 2022

IEEJ Transactions Elec Engng

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Non-member SF 6 is a greenhouse gas. Finding an alternative gas for SF 6 has become an urgent problem in the switch field. In order to explore the feasibility of replacing SF 6 gas with dry air directly, CO 2 and C 4 F 7 N/CO 2 mixed gas, based on the KYN28-12 medium voltage switchgear, the finite element method was used to solve the three-dimensional coupled multi-physics of the switchgear in this paper. From the angle of the temperature field and flow field, the temperature rise characteristics under different operation conditions were analyzed. The results showed that the temperature field and flow field distribution under the four gases were similar. Among them, the temperature rise of SF 6 gas was the smallest, followed by the C 4 F 7 N/CO 2 mixed gas, CO 2 and dry air. The flow rate of SF 6 gas was the lowest, about 0.11 m/s. The flow velocities of other gases were relatively close. When the switchgear was filled with the same gas, as the inflation pressure increased, the temperature rise of the switchgear decreased and the gas flow rate also dropped to a certain extent. The temperature field and flow field of the switchgear under the C 4 F 7 N/CO 2 mixed gas at 0.2 Mpa were similar to those under the 0.1 Mpa SF 6 gas. Under the C 4 F 7 N/CO 2 mixed gas, the contact failure of the plum contact made the temperature rise of the switchgear increase overall. The maximum temperature rise point transferred to the contact failure. The temperature rise further rose with the increase of the contact failure degree. The gas flow rate also greatly increased with the failure degree elevated. From the perspective of temperature rise, the C 4 F 7 N/CO 2 mixed gas has the possibility of being applied in the electrical equipment under the premise of meeting the insulation conditions.

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Theoretical study of rhodium doped single walled carbon nanotube to detecting NF3: A first principle study

Cao

Yao

et al. 2022

Materials Letters

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Effect of Temperature on Insulation Properties of SF₆/N₂ Mixed Gas Under AC Voltage

Cited by 6 publications

References 21 publications

Dielectric breakdown properties of Al-air mixtures

Dielectric breakdown properties of Al-air mixtures

Research on the Temperature Rise Characteristics ofMedium‐VoltageSwitchgear under Different Operation Conditions

Theoretical study of rhodium doped single walled carbon nanotube to detecting NF3: A first principle study

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