發(fā)布時(shí)間：2018-04-28 19:59

  本文選題：絕緣子 + 顆粒荷電��； 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：大氣中污穢顆粒在近輸電線路的離子流場(chǎng)中荷電會(huì)影響絕緣子周?chē)碾妶?chǎng)分布,進(jìn)而改變顆粒的運(yùn)動(dòng)軌跡,影響絕緣子表面的積污狀況。因此,有必要研究污穢顆粒荷電對(duì)絕緣子積污特性和沿面電場(chǎng)的影響。本文概述了污穢顆粒主要的荷電機(jī)理,利用COMSOL對(duì)瓷三傘及復(fù)合絕緣子在顆粒不同荷電方式下風(fēng)洞積污特性進(jìn)行了數(shù)值模擬,將積污量的模擬與試驗(yàn)結(jié)果進(jìn)行了對(duì)比分析,以驗(yàn)證數(shù)值模擬方法的合理性,并探究顆粒相對(duì)合理的荷電方式。籍此,對(duì)弱風(fēng)和微風(fēng)環(huán)境110kV直、交流輸電線路中,瓷三傘絕緣子的自然積污特性進(jìn)行了數(shù)值模擬,比較了不同風(fēng)速和粒徑下顆粒所受流體曳力、電場(chǎng)力和重力的力比,分析了風(fēng)速、粒徑和污穢濃度等因素對(duì)自然積污特性的影響;對(duì)清潔和污染環(huán)境中瓷三傘絕緣子沿面電場(chǎng)的數(shù)值模擬結(jié)果進(jìn)行對(duì)比,探究了顆粒在荷電情況下粒徑、數(shù)量、荷質(zhì)比、極性等因素對(duì)該絕緣子沿面電場(chǎng)的影響。結(jié)果表明:1)本文所采用的數(shù)值模擬方法是合理的,顆�！鞍幢壤焙呻姺绞较鄬�(duì)而言更具合理性。2)直、交流電壓作用下,隨風(fēng)速的增大,絕緣子表面整體積污量先增后減;隨污穢濃度增加,積污量均增加且增速減緩,直流時(shí)增速大于交流。3)弱風(fēng)(0.5~2m/s風(fēng)速)時(shí),直流電壓作用下,積污量隨粒徑增大而增加,交流電壓作用下,先增后減;微風(fēng)(3~5m/s風(fēng)速)時(shí),直、交流電壓作用下,均隨粒徑增大而增加。4)傘裙幾何形狀影響絕緣子沿面電勢(shì)和場(chǎng)強(qiáng)分布,其曲線拐點(diǎn)對(duì)應(yīng)絕緣子表面的特征拐點(diǎn);各傘裙沿面電勢(shì)和場(chǎng)強(qiáng)曲線在清潔和污染環(huán)境中差異較大。5)傘群場(chǎng)強(qiáng)最大值點(diǎn)發(fā)生位置不同:清潔環(huán)境發(fā)生于鑄鐵、空氣及瓷三者交界;污染環(huán)境發(fā)生于主要特征拐點(diǎn)處。6)清潔和污染環(huán)境場(chǎng)強(qiáng)矢量方向不同:清潔環(huán)境從高壓端出發(fā)終止于低壓端;污染環(huán)境(粒徑足夠大)正荷質(zhì)比時(shí)從中間傘裙出發(fā)終止于低壓端或高壓端,負(fù)荷質(zhì)比反之。7)各傘裙沿面場(chǎng)強(qiáng)最大值隨粒徑、數(shù)量、正荷質(zhì)比增大而增大。8)污染環(huán)境傘裙沿面場(chǎng)強(qiáng)最大值可達(dá)清潔環(huán)境的9~70倍,在一定的條件下易發(fā)生局部電弧。
[Abstract]:The distribution of the electric field around the insulator will be affected by the charged charge of the polluted particles in the ion flow field near the transmission line, which will change the moving track of the particles and affect the fouling condition on the surface of the insulator. Therefore, it is necessary to study the influence of the charging of contaminated particles on the fouling characteristics of insulators and the electric field along the surface. In this paper, the main charging mechanism of contaminated particles is summarized. The characteristics of fouling in wind tunnel under different charging modes of ceramic umbrellas and composite insulators are numerically simulated by COMSOL, and the results of simulation and test are compared and analyzed. In order to verify the rationality of the numerical simulation method and explore the relatively reasonable charging mode of particles. In this paper, the natural fouling characteristics of ceramic three-umbrella insulators in 110kV direct and AC transmission lines in weak wind and breeze environments are numerically simulated, and the fluid drag force, electric field force and gravity force ratio of particles under different wind speeds and particle sizes are compared. The effects of wind speed, particle size and pollution concentration on the characteristics of natural fouling are analyzed, and the numerical simulation results of the electric field along the surface of the porcelain three-umbrella insulator in the clean and polluted environment are compared, and the particle size and quantity under the condition of charge are explored. The effect of charge / mass ratio, polarity and other factors on the electric field along the insulator surface. The results show that the numerical simulation method used in this paper is reasonable, the particle "proportional" charging method is more reasonable than that of "proportional" charging mode. Under the action of AC voltage, with the increase of wind speed, the total amount of pollution on the surface of insulator increases first and then decreases. With the increase of pollution concentration, the amount of pollution increased and the growth rate slowed down. The DC speed was higher than that of AC. 3) when the wind speed was 0.5m / s), under DC voltage, the amount of fouling increased with the increase of particle size. Under the action of AC voltage, it increased first and then decreased. When the wind speed is 3 ~ 5 m / s), the geometric shape of umbrella skirt affects the distribution of electric potential and field strength along the surface of insulator, and the curve inflection point corresponds to the characteristic inflection point of insulator surface under the action of direct voltage and AC voltage, and the geometric shape of umbrella skirt affects the distribution of electric potential and field strength along the surface of insulator. The position of maximum field strength of each umbrella skirt is different in clean and polluted environment. 5) the location of maximum field strength of umbrella group is different: clean environment occurs at the junction of cast iron, air and porcelain; Pollution environment occurs at the main feature inflection point. 6) the direction of field intensity vector of clean and polluted environment is different: clean environment terminates from high pressure end to low pressure end; When the positive charge mass ratio of polluted environment (particle size is large enough), it ends at the low pressure end or high pressure end from the middle umbrella skirt, and the maximum field strength along the plane of each umbrella skirt depends on the particle size and quantity. The maximum field strength along the surface of the environmental umbrella skirt is 970 times of that in the clean environment, and local electric arc is easy to occur under certain conditions.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM216

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 唐秋明;高強(qiáng);;風(fēng)沙流對(duì)高壓絕緣子電位和電場(chǎng)分布的影響[J];計(jì)算物理;2016年05期

2 李興財(cái);胡田立;劉彥軍;;非均勻帶電沙粒的電磁散射特性研究[J];光學(xué)學(xué)報(bào);2015年12期

3 陸家榆;何X;馬曉倩;鞠勇;謝莉;;空中顆粒物對(duì)直流電暈放電影響研究現(xiàn)狀:顆粒物空間電荷效應(yīng)[J];中國(guó)電機(jī)工程學(xué)報(bào);2015年23期

4 呂玉坤;衛(wèi)少科;李聰;;瓷雙傘XWP2-160型絕緣子積污特性數(shù)值模擬[J];電瓷避雷器;2015年05期

5 駱仲泱;江建平;趙磊;陳浩;方夢(mèng)祥;岑可法;;不同電場(chǎng)中細(xì)顆粒物的荷電特性研究[J];中國(guó)電機(jī)工程學(xué)報(bào);2014年23期

6 律方成;黃華;劉云鵬;秦春旭;劉琴;徐濤;;風(fēng)洞模擬自然橫風(fēng)條件下絕緣子帶電積污特性[J];高電壓技術(shù);2014年05期

7 趙永生;張文亮;;同走廊高壓交、直流輸電線路混合電場(chǎng)分析[J];高電壓技術(shù);2014年03期

8 孫保強(qiáng);王黎明;關(guān)志成;孟曉波;趙宇明;張福增;;電壓種類(lèi)及極性對(duì)絕緣子積污的影響[J];高電壓技術(shù);2013年12期

9 王晶;李燕;梁曦東;劉瑛巖;;利用原子力顯微鏡探究污穢顆粒在絕緣子表面的粘附力[J];高電壓技術(shù);2013年06期

10 夏谷林;盧喜龍;賴(lài)光霖;林堅(jiān);陳昕;;運(yùn)行中500 kV輸電線路絕緣子串自然積污及污閃特性研究[J];陜西電力;2013年04期

相關(guān)博士學(xué)位論文 前1條

1 李恒真;高壓輸電線路外絕緣動(dòng)態(tài)積污機(jī)理及在線監(jiān)測(cè)研究[D];華南理工大學(xué);2012年

相關(guān)碩士學(xué)位論文 前1條

1 鄒瑩;托卡馬克邊緣等離子體中鋰粉輸運(yùn)的模擬研究[D];大連理工大學(xué);2015年

，

本文編號(hào)：1816658