本文選題：爆炸氣流　切入點：滅弧防雷間隙　出處：《廣西大學》2016年碩士論文　論文類型：學位論文

【摘要】：隨著我國電力網架的不斷鋪設和特高壓線路的高速發(fā)展,架空線路的防雷方式變得更加重要。在我國雷電活動遍及各個省市,由雷擊閃絡造成的絕緣子損壞、線路斷線和停電事故是非常普遍的,在線路跳閘事故中占據較大的比重。針對“堵塞型”防雷方式的效果不佳問題,提出了“疏導型”和爆炸氣流氣吹電弧相結合的防雷方法。本文從交流電弧的伏安特性、弧柱電位梯度、溫度和電弧直徑等參數特性出發(fā),研究電弧發(fā)展的參數變化。建立電弧自熄的離子模型,從微觀角度分析爆炸氣流對電弧的破壞作用,進一步分析爆炸氣流對介質恢復強度的影響。根據鏈式電弧模型對交流電弧進行受力分析,通過爆炸氣流強壓下氣體壓力計算推導出電弧運動特性與爆炸氣流壓力的關系,并結合電弧自熄時間的仿真流程得出電弧的自熄時間。其次,建立交流電弧三維MHD模型、爆炸區(qū)域質點電弧數學模型和爆炸氣流強壓下氣體的能量變化模型,利用ANSYS14.0有限元軟件對爆炸氣流和交流電弧進行耦合,對爆炸氣流截斷電弧過程和氣流壓力分布進行仿真,模擬爆炸氣流動作后電弧自熄的動態(tài)過程。最后,搭建試驗平臺進行爆炸氣流強壓下截斷電弧的自熄試驗,在有效絕緣配合下對多次試驗數據進行數理統(tǒng)計得到電弧的自熄時間,并得出爆炸氣流速度與電弧自熄時間的關系。進一步分析滅弧防雷間隙的實際掛網運行情況,在雷擊頻度高的線路上運行效果良好,一致說明雷擊時爆炸氣流強壓下交流電弧能夠自熄。
[Abstract]:With the continuous laying of power grid in China and the rapid development of UHV lines, the lightning protection mode of overhead lines becomes more important. In China, lightning activities are widespread in all provinces and cities, and the insulators are damaged by lightning flashover. Line breakage and blackout accidents are very common and account for a large proportion of line tripping accidents. In this paper, a lightning protection method combining "grooming type" and explosion gas blowing arc is proposed. The characteristics of voltage and ampere characteristics, arc column potential gradient, temperature and arc diameter of AC arc are studied in this paper. The parameter change of arc development is studied. The ion model of arc self-extinguishing is established, and the destructive effect of explosion flow on arc is analyzed from the microscopic point of view. According to the chain arc model, the stress of AC arc is analyzed, and the relation between arc motion characteristic and explosion flow pressure is deduced by calculating the gas pressure under the strong pressure of explosion airflow. Combined with the simulation flow of arc self-extinguishing time, the self-extinguishing time of arc is obtained. Secondly, the three-dimensional MHD model of AC arc, the mathematical model of particle arc in explosion region and the energy change model of gas under strong pressure of explosion flow are established. The ANSYS14.0 finite element software is used to couple the explosion flow with the AC arc. The arc truncation process and the pressure distribution of the explosion flow are simulated to simulate the dynamic process of the arc self-extinguishing after the explosion flow moves. The self-extinguishing test of the cut off arc under the strong pressure of explosion flow was carried out on a test platform, and the self-extinguishing time of the arc was obtained by mathematical statistics of the test data under the effective insulation cooperation. The relationship between the velocity of explosion airflow and the time of arc self-extinguishing is obtained. Further analysis is made on the actual operation of the gap between arc extinguishing and lightning protection, and the running effect on the lines with high lightning strike frequency is good. The results show that the AC arc can be extinguished under the strong pressure of the explosion flow during the lightning strike.
【學位授予單位】：廣西大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TM863

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