高速鐵路高架橋引雷特性及其影響因素研究
發(fā)布時間：2019-01-29 06:21
【摘要】：在國民經(jīng)濟建設(shè)的快速發(fā)展下,運輸供需矛盾日益嚴重,高速鐵路以其自身特有的優(yōu)點得到了大力發(fā)展。本文首先分析了國內(nèi)外高速鐵路防雷現(xiàn)狀,發(fā)現(xiàn)我國高速鐵路中架設(shè)了大量的高架橋,高速鐵路高架橋結(jié)構(gòu)使得接觸網(wǎng)對地高度增加,更易遭受雷擊,闡述了高速鐵路防雷研究的重要性。本文主要針對我國高速鐵路高架橋處接觸網(wǎng)的耐雷水平和引雷特性及其影響因素進行研究。本文結(jié)合高速鐵路實際情況,基于ATP-EMTP電磁仿真軟件,建立了高速鐵路高架橋處接觸網(wǎng)雷擊仿真模型。分析了雷擊不同線路、雷擊點在不同支柱上、接地電阻和高架橋高度這幾個因素對接觸網(wǎng)耐雷水平的影響規(guī)律。研究結(jié)果表明：雷擊接觸網(wǎng)時,AF線絕緣子的耐雷水平最低,遭受雷擊的概率最大；高速鐵路高架橋處接觸網(wǎng)的耐雷水平隨接地電阻的增大而減小,隨高架橋高度的增加而減小。為了分析高速鐵路高架橋處接觸網(wǎng)的引雷特性,基于雷電發(fā)展規(guī)律,建立了高速鐵路高架橋處接觸網(wǎng)系統(tǒng)的先導(dǎo)傳播模型。研究雷電流幅值以及高架橋高度對接觸網(wǎng)直擊雷以及感應(yīng)雷的引雷范圍影響規(guī)律。研究結(jié)果表明：隨雷電流幅值增大,直擊雷和感應(yīng)雷引雷范圍均增加；隨高架橋高度增高,直擊雷引雷范圍增加,感應(yīng)雷引雷范圍減小,由此擬合出直擊雷引雷范圍的計算公式L(I,h)=α(I)h+b(l),可作為高速鐵路防雷設(shè)計的一個參考。最后研究了雷電流幅值以及高架橋高度對直擊雷分布概率以及雷擊閃絡(luò)次數(shù)的影響規(guī)律。研究結(jié)果表明：隨著高架橋高度增加,出現(xiàn)有效感應(yīng)雷的臨界雷電流幅值增大,感應(yīng)雷出現(xiàn)概率降低,因直擊雷引起的絕緣子閃絡(luò)次數(shù)增大,感應(yīng)雷引起的閃絡(luò)次數(shù)減小,雷擊總閃絡(luò)次數(shù)增大,直擊雷所占比重遠遠大于感應(yīng)雷；直擊雷對高速鐵路接觸網(wǎng)正常運行造成的威脅是不容忽視的,應(yīng)該針對直擊雷采取有效的防護措施。
[Abstract]:With the rapid development of national economy, the contradiction between supply and demand of transportation is becoming more and more serious. In this paper, the present situation of lightning protection of high-speed railway at home and abroad is analyzed, and it is found that a large number of viaducts have been erected in China's high-speed railway. The overhead bridge structure of high-speed railway increases the height of catenary to the ground and is more vulnerable to lightning strike. The importance of research on lightning protection of high speed railway is expounded. In this paper, the lightning resistance level and characteristics of catenary at the overhead bridge of high speed railway in China and its influencing factors are studied. In this paper, based on ATP-EMTP electromagnetic simulation software, the lightning strike simulation model of catenary at viaduct of high speed railway is established based on the actual situation of high speed railway. The effects of lightning strike on different lines, lightning strike points on different pillars, grounding resistance and viaduct height on the lightning resistance of catenary are analyzed. The results show that when the catenary is struck by lightning, the AF insulator has the lowest lightning resistance level and the highest probability of being struck by lightning. The lightning resistance level of catenary at high speed railway viaduct decreases with the increase of grounding resistance and decreases with the increase of viaduct height. In order to analyze the lightning characteristics of catenary in high speed railway viaduct, based on the law of lightning development, a pilot propagation model of catenary system at viaduct of high speed railway is established. The effects of lightning current amplitude and viaduct height on the lightning range of catenary direct strike and induction lightning are studied. The results show that with the increase of lightning current amplitude, the range of direct strike and induced lightning is increased. With the elevation of viaduct increasing, the range of lightning induced by direct strike increases, and the range of induced lightning decreases. Thus, the formula L (Ih) = 偽 (I) h b (l), is fitted to calculate the range of lightning induced by direct strike. It can be used as a reference for lightning protection design of high speed railway. Finally, the effects of lightning current amplitude and viaduct height on lightning distribution probability and lightning flashover times are studied. The results show that with the increase of viaduct height, the critical lightning current amplitude of effective induced lightning increases, the occurrence probability of induced lightning decreases, the flashover number of insulator caused by direct lightning increases, and the flashover caused by induced lightning decreases. The total flashover times of lightning are increased, and the proportion of direct lightning is much larger than that of inductive lightning. The threat posed by direct lightning to the normal operation of catenary in high speed railway should not be ignored, and effective protective measures should be taken against it.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U447;U225
本文編號：2417730
[Abstract]:With the rapid development of national economy, the contradiction between supply and demand of transportation is becoming more and more serious. In this paper, the present situation of lightning protection of high-speed railway at home and abroad is analyzed, and it is found that a large number of viaducts have been erected in China's high-speed railway. The overhead bridge structure of high-speed railway increases the height of catenary to the ground and is more vulnerable to lightning strike. The importance of research on lightning protection of high speed railway is expounded. In this paper, the lightning resistance level and characteristics of catenary at the overhead bridge of high speed railway in China and its influencing factors are studied. In this paper, based on ATP-EMTP electromagnetic simulation software, the lightning strike simulation model of catenary at viaduct of high speed railway is established based on the actual situation of high speed railway. The effects of lightning strike on different lines, lightning strike points on different pillars, grounding resistance and viaduct height on the lightning resistance of catenary are analyzed. The results show that when the catenary is struck by lightning, the AF insulator has the lowest lightning resistance level and the highest probability of being struck by lightning. The lightning resistance level of catenary at high speed railway viaduct decreases with the increase of grounding resistance and decreases with the increase of viaduct height. In order to analyze the lightning characteristics of catenary in high speed railway viaduct, based on the law of lightning development, a pilot propagation model of catenary system at viaduct of high speed railway is established. The effects of lightning current amplitude and viaduct height on the lightning range of catenary direct strike and induction lightning are studied. The results show that with the increase of lightning current amplitude, the range of direct strike and induced lightning is increased. With the elevation of viaduct increasing, the range of lightning induced by direct strike increases, and the range of induced lightning decreases. Thus, the formula L (Ih) = 偽 (I) h b (l), is fitted to calculate the range of lightning induced by direct strike. It can be used as a reference for lightning protection design of high speed railway. Finally, the effects of lightning current amplitude and viaduct height on lightning distribution probability and lightning flashover times are studied. The results show that with the increase of viaduct height, the critical lightning current amplitude of effective induced lightning increases, the occurrence probability of induced lightning decreases, the flashover number of insulator caused by direct lightning increases, and the flashover caused by induced lightning decreases. The total flashover times of lightning are increased, and the proportion of direct lightning is much larger than that of inductive lightning. The threat posed by direct lightning to the normal operation of catenary in high speed railway should not be ignored, and effective protective measures should be taken against it.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U447;U225
【參考文獻】
相關(guān)期刊論文 前1條
1 何金良;張薛巍;董林;曾嶸;劉澤洪;;輸電線路雷擊過程分析的雷電通道分形模型[J];中國科學(xué)(E輯:技術(shù)科學(xué));2009年11期
，本文編號：2417730
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