本文選題：架空線路 + 交流電弧��； 參考：《廣西大學》2017年碩士論文

【摘要】：并聯間隙是架空線路上常用的一種雷電防護方式,可以有效的保護線路絕緣子免受交流電弧燒蝕,但由于其缺乏熄弧能力,容易造成輸電線路跳閘,影響供電穩(wěn)定性。為有效熄滅輸電線路交流電弧,并且防止其因交流電源或多次回擊導致電弧重燃,大幅降低雷擊跳閘率,研制了一種連續(xù)觸發(fā)噴射氣流滅弧間隙。該裝置通過連續(xù)觸發(fā)的兩次高速氣流,在熄滅電弧的同時持續(xù)加速弧道對流散熱,抑制電弧重燃。同時,針對多次回擊引起弧道重燃的情況,裝置通過快速的切換滅弧能量體做到氣流與回擊一一對應,抑制重燃。本文首先基于爆炸力學的C-J理論,研究了滅弧間隙內噴射氣流產生的機理,建立了高速高壓的氣流沖擊波數學模型。然后基于電弧能量平衡理論,分析了交流電弧熄滅的機理,研究了電弧通道能量散失的三種途徑,建立了氣流耦合電弧的模型。通過ANSYS Fluent軟件對噴射氣流熄滅交流電弧并抑制其重燃的全過程進行數值模擬,對前文建立的模型進行數值求解。經過仿真,7.1 ms時,電弧通道的平均溫度Ta首次低于3000K,電弧熄滅,之后噴射氣流繼續(xù)對整個通道對流散熱,抑制電弧重燃。在實驗室環(huán)境下,模擬了裝置單次熄弧試驗與多次觸發(fā)實驗。實驗結果表明,連續(xù)觸發(fā)噴射氣流滅弧防雷間隙可在8 ms內熄滅電弧,并且對于間隔時間大于20.7 ms的兩次閃擊,裝置均可通過對滅弧能量體的重復觸發(fā)以熄滅重燃的交流電弧。連續(xù)觸發(fā)噴射氣流滅弧間隙目前已試運行于兩條線路。根據運行記錄,試運行線路雷擊跳閘率、雷擊事故率大幅下降,并能夠防護住200kA級雷電的多次回擊。
[Abstract]:Parallel gap is a commonly used lightning protection method on overhead lines, which can effectively protect insulators from AC arc ablation. However, due to its lack of ability to extinguish arc, it is easy to cause tripping of transmission lines and affect the stability of power supply. In order to effectively extinguish the AC arc of the transmission line and prevent the arc reburning caused by AC power supply or multiple backstrokes, and to greatly reduce the lightning tripping rate, a continuous trigger jet arc interrupter gap is developed. This device can continuously accelerate the convection and heat dissipation of the arc channel while extinguishing the arc through two continuous triggered high speed airflow, so as to restrain the reburning of the arc. At the same time, in view of the reburning of the arc channel caused by multiple backstrokes, the device can quickly switch the arc-extinguishing energy body to match the airflow and the return stroke one by one, so as to suppress the reburning. In this paper, based on the C-J theory of explosion mechanics, the mechanism of jet flow in interrupter gap is studied, and the mathematical model of airflow shock wave at high speed and high pressure is established. Then based on the theory of arc energy balance, the mechanism of AC arc extinction is analyzed, three ways of energy dissipation in arc channel are studied, and the model of airflow coupled arc is established. The whole process of jet flow extinguishing AC arc and suppressing its reburning is numerically simulated by ANSYS Fluent software, and the numerical solution of the model established above is carried out. After emulation for 7.1 Ms, the average temperature of the arc channel is lower than 3000K for the first time, and the arc is extinguished, and then the jet flow continues to dissipate the heat of the whole channel and restrain the reburning of the arc. In the laboratory environment, single arc extinguishing test and multiple trigger test are simulated. The experimental results show that the lightning gap can be extinguished within 8 Ms, and for two flashes whose interval time is greater than 20.7 Ms, the device can extinguish the reburning AC arc by repeatedly triggering the arc extinguishing energy body. The continuously triggered jet arc-extinguishing gap has now been tested on two lines. According to the operation record, the lightning tripping rate and the lightning accident rate of the trial operation line are greatly reduced, and the lightning strike rate of 200kA grade can be protected against multiple lightning strikes.
【學位授予單位】：廣西大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM863

【參考文獻】

相關期刊論文 前10條

1 翟國富;薄凱;李慶楠;周學;陳默;焦通;;直流電弧運動過程中重擊穿現象及機理研究[J];電工技術學報;2016年11期

2 王巨豐;吳東;李國棟;梁雪;郭偉;;爆炸氣流作用下暫態(tài)電弧自熄滅時間計算[J];高電壓技術;2015年12期

3 王巨豐;郭偉;梁雪;吳東;李國棟;丁漪;;爆炸氣流滅弧試驗與滅弧溫度仿真分析[J];高電壓技術;2015年05期

4 王巨豐;劉津濂;吳國強;劉其良;郭偉;;噴射氣流滅弧條件下輸電線路雷擊跳閘率計算方法[J];高電壓技術;2015年03期

5 許曄;郭謀發(fā);陳彬;楊耿杰;;配電網單相接地電弧建模及仿真分析研究[J];電力系統(tǒng)保護與控制;2015年07期

6 劉欣;鄭濤;黃少鋒;楊國生;;自動重合閘引起風電場連鎖脫網的解決策略分析[J];電力系統(tǒng)保護與控制;2015年05期

7 王巨豐;郭偉;郭峰;劉其良;梁雪;吳東;劉津濂;;噴射氣體滅弧防雷間隙的滅弧效果[J];中國電機工程學報;2015年03期

8 胡毅;劉凱;吳田;劉艷;蘇梓銘;;輸電線路運行安全影響因素分析及防治措施[J];高電壓技術;2014年11期

9 余壽全;;廣西電網架空輸電線路雷擊跳閘及影響因素分析[J];廣西電力;2013年06期

10 鄭駿;陳立峰;李均;馮靖yN;;氣體模式設置對呼吸機質量控制影響的研究[J];中國醫(yī)療設備;2013年08期

相關碩士學位論文 前4條

1 李國棟;爆炸氣流強壓下滅弧防雷間隙截斷電弧自熄機理與試驗研究[D];廣西大學;2016年

2 曾嶸;碳酸鹽巖儲層水平井預制孔眼噴射酸化模擬研究[D];西南石油大學;2014年

3 曹波;復雜形體建筑的風荷載體型系數及其幕墻體系施工順序數值風洞研究[D];重慶大學;2014年

4 王濱;導熱高速氣流與電弧耦合模型及應用效果分析[D];廣西大學;2011年

，

本文編號：1860086