沙塵環(huán)境下接觸網(wǎng)絕緣子電場分布的仿真研究
發(fā)布時間：2018-08-08 21:24
【摘要】：我國西北地區(qū)植被稀疏，土地荒漠化導(dǎo)致的沙塵暴已經(jīng)嚴重影響了鐵路運輸生產(chǎn)的安全運行。沙塵天氣不僅加速了沙塵在絕緣子表面的沉積，還使絕緣子周圍的清潔空氣變成了空氣和懸浮沙粒的混合媒質(zhì)，并且在空間中形成了強烈的沙塵電場。工作環(huán)境的改變會影響絕緣子的電場分布，從而可能導(dǎo)致閃絡(luò)，研究沙塵環(huán)境下接觸網(wǎng)絕緣子的電場分布可為同環(huán)境下絕緣子閃絡(luò)等相關(guān)研究提供參考依據(jù)。 本文以電氣化鐵路接觸網(wǎng)專用的QBN-25型號腕臂棒形瓷絕緣子為研究對象，基于靜電場有限元法建立了沙塵環(huán)境下絕緣子電場數(shù)值計算的仿真模型。應(yīng)用人工截斷法設(shè)置合理的空氣域邊界，將絕緣子電場分布問題的求解由無限開區(qū)域轉(zhuǎn)化為有限閉區(qū)域，并設(shè)置無限元區(qū)域解決了絕緣子電場的遠場耗散問題。針對懸浮沙粒數(shù)量巨大，普通計算機無法計算的問題，根據(jù)模型的軸對稱特性和網(wǎng)格剖分的可操作性，，制作了完整幾何模型的簡化模型，大幅提高了仿真效率。應(yīng)用COMSOL Multiphysics有限元軟件計算分析了在絕緣子表面覆沙、沙塵電場、空氣中懸浮沙粒等沙塵環(huán)境下絕緣子沿面電場的分布特性。 仿真結(jié)果表明：絕緣子沿面電位和電場分布受絕緣子幾何形狀影響明顯；絕緣子表面沉積沙塵會降低覆沙處的場強；當(dāng)沙層中出現(xiàn)無沙帶時，無沙帶處的場強將會升高；沙塵電場會使絕緣子圓周方向的電場發(fā)生改變；空氣中懸浮的電中性沙粒可小幅畸變絕緣子沿面電位和電場；懸浮沙粒帶上相同的電量后，絕緣子沿面電位和電場的畸變幅度加大，其畸變幅度受懸浮沙粒的粒徑、數(shù)量、帶電量的大小和極性影響明顯；混合粒子群對絕緣子沿面電位和電場的畸變幅度受粒子群中沙粒的帶電特性影響明顯。各種沙塵環(huán)境均會不同程度畸變絕緣子沿面電場，各具特點，懸浮沙粒帶電是絕緣子沿面電場畸變的重要原因。
[Abstract]:The sparse vegetation and the dust storm caused by land desertification have seriously affected the safe operation of railway transportation production in northwest China. The dust weather not only accelerates the deposition of dust on the insulator surface, but also makes the clean air around the insulator become a mixed medium of air and suspended sand particles, and forms a strong dust electric field in space. The change of working environment will affect the electric field distribution of insulators, which may lead to flashover. The study of electric field distribution of catenary insulators in sand dust environment can provide reference for the study of insulator flashover in the same environment. In this paper, the electric field simulation model of QBN-25 type wrist-arm rod porcelain insulator for catenary of electrified railway is established based on the finite element method of electrostatic field. Using artificial truncation method to set reasonable air boundary, the solution of insulator electric field distribution problem is transformed from infinite open region to finite closed area, and the far-field dissipation problem of insulator electric field is solved by setting infinite element region. According to the axisymmetric characteristics of the model and the maneuverability of mesh generation, a simplified model of complete geometric model is made, which greatly improves the efficiency of simulation. The distribution characteristics of the insulator electric field along the surface of the insulator in the environment of sand coated on the surface of insulator, dust electric field and suspended sand particles in the air are calculated and analyzed by using the COMSOL Multiphysics finite element software. The simulation results show that the distribution of potential and electric field along the insulator surface is obviously affected by the geometry of the insulator, the sand dust deposited on the surface of the insulator will reduce the field strength of the sand covered area, and the field strength will increase when there is no sand zone in the sand layer. The dust electric field changes the electric field in the circumferential direction of the insulator; the electric neutral sand particles suspended in the air can slightly distort the insulator surface potential and electric field; after the same electric quantity on the suspended sand belt, The distortion amplitude of insulator along the surface potential and electric field is increased, and the distortion amplitude is obviously affected by the particle size, quantity of suspended sand, the size and polarity of the band electric quantity. The effect of mixed particle swarm on the surface potential and electric field distortion of insulator is obviously affected by the charged characteristics of sand particles in the particle swarm. All kinds of sand and dust environments will distort the electric field along the insulator to varying degrees, and each has its own characteristics. The suspended sand charged is an important reason for the distortion of the insulator's electric field along the insulator's surface.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM216;U225
本文編號：2173079
[Abstract]:The sparse vegetation and the dust storm caused by land desertification have seriously affected the safe operation of railway transportation production in northwest China. The dust weather not only accelerates the deposition of dust on the insulator surface, but also makes the clean air around the insulator become a mixed medium of air and suspended sand particles, and forms a strong dust electric field in space. The change of working environment will affect the electric field distribution of insulators, which may lead to flashover. The study of electric field distribution of catenary insulators in sand dust environment can provide reference for the study of insulator flashover in the same environment. In this paper, the electric field simulation model of QBN-25 type wrist-arm rod porcelain insulator for catenary of electrified railway is established based on the finite element method of electrostatic field. Using artificial truncation method to set reasonable air boundary, the solution of insulator electric field distribution problem is transformed from infinite open region to finite closed area, and the far-field dissipation problem of insulator electric field is solved by setting infinite element region. According to the axisymmetric characteristics of the model and the maneuverability of mesh generation, a simplified model of complete geometric model is made, which greatly improves the efficiency of simulation. The distribution characteristics of the insulator electric field along the surface of the insulator in the environment of sand coated on the surface of insulator, dust electric field and suspended sand particles in the air are calculated and analyzed by using the COMSOL Multiphysics finite element software. The simulation results show that the distribution of potential and electric field along the insulator surface is obviously affected by the geometry of the insulator, the sand dust deposited on the surface of the insulator will reduce the field strength of the sand covered area, and the field strength will increase when there is no sand zone in the sand layer. The dust electric field changes the electric field in the circumferential direction of the insulator; the electric neutral sand particles suspended in the air can slightly distort the insulator surface potential and electric field; after the same electric quantity on the suspended sand belt, The distortion amplitude of insulator along the surface potential and electric field is increased, and the distortion amplitude is obviously affected by the particle size, quantity of suspended sand, the size and polarity of the band electric quantity. The effect of mixed particle swarm on the surface potential and electric field distortion of insulator is obviously affected by the charged characteristics of sand particles in the particle swarm. All kinds of sand and dust environments will distort the electric field along the insulator to varying degrees, and each has its own characteristics. The suspended sand charged is an important reason for the distortion of the insulator's electric field along the insulator's surface.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM216;U225
【參考文獻】
相關(guān)期刊論文 前10條
1 沈鼎申,張孝軍,萬啟發(fā),阮江軍;750kV線路絕緣子串電壓分布的有限元計算[J];電網(wǎng)技術(shù);2003年12期
2 徐志鈕;律方成;;絕緣材料及其參數(shù)對絕緣子表面電場強度和電位分布的影響[J];電網(wǎng)技術(shù);2011年09期
3 司馬文霞;吳亮;楊慶;;沙塵對電力系統(tǒng)外絕緣電氣特性影響分析[J];高電壓技術(shù);2008年01期
4 司馬文霞;馬高權(quán);楊慶;;風(fēng)沙條件下的平板模型直流沿面放電特性(英文)[J];高電壓技術(shù);2008年12期
5 司馬文霞;程浩;楊慶;袁濤;楊鳴;葉軒;;沙塵環(huán)境下絕緣子交流閃絡(luò)特性及機理[J];高電壓技術(shù);2011年04期
6 黃道春;黃正芳;王國利;阮江軍;張媛;李敏;;特高壓交流輸電線路瓷絕緣子串電位和均壓環(huán)電場分布計算模型的簡化[J];高電壓技術(shù);2012年09期
7 蔣興良;劉毓;張志勁;胡建林;尹芳輝;向澤;;覆冰地區(qū)交流輸電線路復(fù)合絕緣子傘裙結(jié)構(gòu)的電場分布優(yōu)化[J];高電壓技術(shù);2013年01期
8 孫才新,顧樂觀,謝軍,張建輝,舒立春;染污絕緣子沿面電場分布與局部電弧發(fā)展的關(guān)系[J];中國科學(xué)(A輯 數(shù)學(xué) 物理學(xué) 天文學(xué) 技術(shù)科學(xué));1991年10期
9 鄭曉靜,黃寧,周又和;風(fēng)沙運動的沙粒帶電機理及其影響的研究進展[J];力學(xué)進展;2004年01期
10 錢正安,宋敏紅,李萬元;近50年來中國北方沙塵暴的分布及變化趨勢分析[J];中國沙漠;2002年02期
本文編號：2173079
本文鏈接：http://sikaile.net/kejilunwen/dianlilw/2173079.html
最近更新
教材專著
