Study on Arc Characteristics of DC Low Current Interruption in SF6/N2 Gas Mixture

doi:10.16628/j.cnki.2095-8188.2025.01.005

Abstract

Abstract:

To investigate the arc characteristics of the SF₆/N₂ gas mixture,a direct current (DC) lower current interruption platform was developed.A high-speed camera and a visual prototype were used to capture the arc combustion process at various SF₆/N₂ mixture concentrations and different operating conditions.The research showed that with the increase of filling pressure and SF₆ gas content,the arc radius decreased and the center brightness of arc increased.With the decrease of interrupting speed and the rise of current level,arc radiuses and arc brightness both increased.The arc burning time and arc voltage critical value were inversely correlated with SF₆ gas content,but positively correlated with filling pressure.The auxiliary analysis of arc images facilitated an understanding of the extinguishing mechanisms associated with SF₆/N₂ gas mixture,thereby advancing its application in switchgear technology.

Key words: SF₆/N₂ gas mixture, arc images, DC, arc voltage

CLC Number:

TM564.1

WANG Zhoujing, CHEN Shizhe, ZHAO Dongxu, LI Xingwen. Study on Arc Characteristics of DC Low Current Interruption in SF₆/N₂ Gas Mixture[J]. LOW VOLTAGE APPARATUS, 2025, 0(1): 28-32.

Figures/Tables 10

References 15

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实验组别	气体介质	充气压力/MPa	开断速度/ (m·s^-1)	实验电流/A
1	SF₆	0.1	0.3	80
2	SF₆	0.2	0.3	80
3	SF₆	0.3	0.3	80
4	60%SF₆+40%N₂	0.3	0.3	80
5	30%SF₆+70%N₂	0.3	0.3	80
6	30%SF₆+70%N₂	0.3	0.4	80
7	30%SF₆+70%N₂	0.4	0.4	50
8	30%SF₆+70%N₂	0.4	0.4	80

Study on Arc Characteristics of DC Low Current Interruption in SF₆/N₂ Gas Mixture

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