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

【摘要】：并聯(lián)間隙是架空線路上常用的一種雷電防護(hù)方式,可以有效的保護(hù)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?fù)魧?dǎo)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(shí)持續(xù)加速弧道對(duì)流散熱,抑制電弧重燃。同時(shí),針對(duì)多次回?fù)粢鸹〉乐厝嫉那闆r,裝置通過快速的切換滅弧能量體做到氣流與回?fù)粢灰粚?duì)應(yīng),抑制重燃。本文首先基于爆炸力學(xué)的C-J理論,研究了滅弧間隙內(nèi)噴射氣流產(chǎn)生的機(jī)理,建立了高速高壓的氣流沖擊波數(shù)學(xué)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(jī)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(duì)噴射氣流熄滅交流電弧并抑制其重燃的全過程進(jìn)行數(shù)值模擬,對(duì)前文建立的模型進(jìn)行數(shù)值求解。經(jīng)過仿真,7.1 ms時(shí),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(duì)整個(gè)通道對(duì)流散熱,抑制電弧重燃。在實(shí)驗(yàn)室環(huán)境下,模擬了裝置單次熄弧試驗(yàn)與多次觸發(fā)實(shí)驗(yàn)。實(shí)驗(yàn)結(jié)果表明,連續(xù)觸發(fā)噴射氣流滅弧防雷間隙可在8 ms內(nèi)熄滅電弧,并且對(duì)于間隔時(shí)間大于20.7 ms的兩次閃擊,裝置均可通過對(duì)滅弧能量體的重復(fù)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(yùn)行于兩條線路。根據(jù)運(yùn)行記錄,試運(yùn)行線路雷擊跳閘率、雷擊事故率大幅下降,并能夠防護(hù)住200kA級(jí)雷電的多次回?fù)簟?br/>[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(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM863

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