Kim Youn-Jea, Lee Jong-Chul
School of Mechanical Engineering, Sungkyunkwan University, 300 Cheoncheon-dong, Suwon 16419, Korea.
Department of Automotive Engineering, Gangneung-Wonju National University, Wonju 26403, Korea.
J Nanosci Nanotechnol. 2020 Nov 1;20(11):7201-7205. doi: 10.1166/jnn.2020.18860.
Pure sulfur hexafluoride is a colorless, odorless, non-toxic, inflammable, chemically inert and thermally stable gas and has proven its worth as an excellent interruption and dielectric medium. SF has been successfully used for interruption and insulation purposes as interrupters and circuit-breakers in gas-insulated substations. Due to its long lifetime and high global warming potential, this gas was put on the list of fluorinated greenhouse gases in the Kyoto Protocol aimed at controlling the emission of man-made greenhouse gases. This factor makes the search for an environmentally friendly alternative to SF all the more urgent. In this paper, we conducted computations on the thermal and aerodynamic behaviors of SF and an alternative CO₂ switching arcs in a self-blast chamber in order to compare the switching phenomena and the thermal reignition from an engineering point of view. Through the complete work, the 3,000 K isotherm of the remnant arc column within microseconds after a current zero was used to evaluate the thermal reignition of SF and CO₂ switching arcs with the slope of the tangential line of the transient recovery voltage on a microscopic scale.
纯六氟化硫是一种无色、无味、无毒、不可燃、化学惰性且热稳定的气体，已证明其作为一种优异的灭弧和电介质介质的价值。六氟化硫已成功用作气体绝缘变电站中的灭弧室和断路器，用于灭弧和绝缘目的。由于其长寿命和高全球变暖潜能值，这种气体被列入旨在控制人为温室气体排放的《京都议定书》中的氟化温室气体清单。这一因素使得寻找一种对环境友好的六氟化硫替代品变得更加紧迫。在本文中，我们对六氟化硫和替代物二氧化碳在自能灭弧室中的热行为和气动行为进行了计算，以便从工程角度比较开断现象和热重燃。通过整个研究工作，利用电流零点后微秒内残余电弧柱的3000K等温线，在微观尺度上用暂态恢复电压切线斜率来评估六氟化硫和二氧化碳开断电弧的热重燃。
