覆膜對(duì)GIS中自由導(dǎo)電微粒運(yùn)動(dòng)行為的影響
發(fā)布時(shí)間：2018-07-17 21:02
【摘要】：以SF6氣體為絕緣介質(zhì)的氣體絕緣金屬封閉系統(tǒng)(Gas Insulated Metal Enclosed System,即GIS)具有性能穩(wěn)定、可靠性高、傳輸容量大、損耗小、環(huán)境友好等優(yōu)點(diǎn),在特高壓輸電和離岸大規(guī)模風(fēng)電輸送等領(lǐng)域都有巨大的應(yīng)用前景。GIS在生產(chǎn)、運(yùn)輸、運(yùn)行等過程中由于設(shè)備振動(dòng)、摩擦、解吸附等不可控制因素將不可避免地產(chǎn)生金屬微粒,對(duì)GIS絕緣性能產(chǎn)生嚴(yán)重影響,具體表現(xiàn)為:1)沉積在外腔體表面的金屬微粒將畸變其電場(chǎng)分布,引發(fā)內(nèi)部局部放電;2)受電場(chǎng)力的作用在GIS腔體內(nèi)發(fā)生定向移動(dòng),減小間隙距離,引發(fā)間隙擊穿;3)定向移動(dòng)并附著于絕緣子表面,畸變絕緣子表面電場(chǎng)分布,引發(fā)沿面閃絡(luò)。相關(guān)研究表明,GIS中存在金屬微粒時(shí),可導(dǎo)致其內(nèi)部絕緣強(qiáng)度下降90%,嚴(yán)重影響GIS運(yùn)行的穩(wěn)定性和可靠性。外腔體內(nèi)表面覆膜是抑制金屬微粒運(yùn)動(dòng)、改善金屬微粒污染問題的一種重要措施。覆膜后,微粒與電極間的碰撞特性、電荷量、啟舉電壓可能會(huì)發(fā)生改變,本文對(duì)此展開研究。根據(jù)運(yùn)動(dòng)學(xué)原理,搭建了碰撞系數(shù)測(cè)量平臺(tái),研究了覆膜后微粒與電極表面的碰撞恢復(fù)系數(shù)。分別獲得了粒徑、碰撞速度、覆膜材料和覆膜厚度對(duì)碰撞系數(shù)的影響規(guī)律,并進(jìn)行了回歸分析。實(shí)驗(yàn)表明,通過采用硬度小彈性好的硅橡膠絕緣層可以達(dá)到控制微粒與電極碰撞后彈起高度的目的�；诜ɡ诨\,搭建了直流電壓下空氣中微粒帶電量測(cè)量實(shí)驗(yàn)平臺(tái),獲得了覆膜對(duì)微粒帶電量的影響規(guī)律。對(duì)不同電極覆膜(PET膜、硅橡膠膜等)時(shí)的帶電量進(jìn)行了測(cè)量,發(fā)現(xiàn)覆膜并不影響微粒的最終帶電量,只是延長(zhǎng)了微粒的充電時(shí)間。根據(jù)覆膜后微粒與薄膜間的傳導(dǎo)帶電機(jī)理,對(duì)上述結(jié)果進(jìn)行了解釋。本文建立了覆膜后金屬微粒啟舉實(shí)驗(yàn)平臺(tái),獲得了直流電壓下空氣中微粒的啟舉電壓。實(shí)驗(yàn)發(fā)現(xiàn)覆膜對(duì)微粒有明顯的靜電吸附作用,使得啟舉電壓明顯提高;研究了薄膜材質(zhì)、厚度對(duì)微粒啟舉電壓的影響。實(shí)驗(yàn)表明,電極表面覆上同樣厚度的硅橡膠膜比PET膜情況下的啟舉電壓大,隨著薄膜厚度的增大,啟舉電壓有增大趨勢(shì),但效果不明顯。實(shí)驗(yàn)發(fā)現(xiàn),覆膜后微粒的運(yùn)動(dòng)會(huì)明顯減弱,且微粒將出現(xiàn)延時(shí)啟舉和間歇起跳現(xiàn)象。最后本文指出了研究中存在的不足及尚待研究的問題,對(duì)GIS中金屬微粒污染無害化研究做了展望。
[Abstract]:The gas insulated metal sealing system (Gas Insulated Metal Enclosed System, GIS) with SF6 gas as insulating medium has the advantages of stable performance, high reliability, high transmission capacity, small loss and friendly environment. It has great application prospects in UHV transmission and offshore large-scale wind power transmission, such as.GIS in production, transportation, operation and so on. In the process, the metal particles will inevitably be produced due to the incontrollable factors such as equipment vibration, friction, desorption and so on. It has a serious effect on the insulation performance of GIS. 1) the metal particles deposited on the surface of the outer cavity will distort the electric field distribution and cause internal partial discharge; 2) the directional shift of the electric field forces in the cavity of the cavity. Moving, reducing gap distance, causing gap breakdown; 3) moving and attaching to the insulator surface, distorting the distribution of electric field on the surface of insulators and triggering the flashover along the surface. The related research shows that the internal insulation strength of the GIS can be reduced by 90% when there is metal particles in the surface, which seriously affects the stability and reliability of the operation of the external cavity. It is an important measure to restrain the movement of metal particles and improve the pollution of metal particles. After the film, the collision characteristics between the particles and the electrodes, the amount of charge and the lift voltage may change. This is a study in this paper. According to the principle of kinematics, the collision coefficient measurement platform is set up, and the collision recovery of the particles and the surface of the electrode after the film is studied. The influence of particle size, collision speed, film mulching material and film thickness on the impact coefficient is obtained, and the regression analysis is carried out. The experiment shows that the purpose of controlling the height of the particles after the collision between the particles and the electrode can be achieved by using the good hardness small elastic silicon rubber insulating layer. Based on the Faraday cage, the direct current voltage is set up. The influence law of the film on the charge quantity of the particles was obtained by the experimental platform of measuring the charge quantity of particles in the air. The charge quantity of the film (PET film, silicone rubber film, etc.) was measured by different electrodes. It was found that the film did not affect the final charge of the particles, but the charging time of the particles was prolonged. The conduction band between the particles and the film after the film was used. The results are explained by the motor theory. In this paper, the open lift test platform of metal particles after the film is established, and the starting voltage of the particles in the air under DC voltage is obtained. It is found that the film has obvious electrostatic adsorption on the particles, which makes the lift voltage obviously improved, and the effect of the material and thickness of the film on the lift voltage is studied. The experiment shows that the opening voltage of the silicon rubber film with the same thickness is larger than that of the PET film. With the increase of the thickness of the film, the lift voltage is increasing, but the effect is not obvious. It is found that the movement of the particles will be obviously weakened after the film mulching, and the particles will have the phenomenon of delay lifting and intermittent take-off. Finally, the paper points out the research. The existing deficiencies and problems to be solved are discussed. The prospect of harmless research on metal particle pollution in GIS is prospected.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM595
本文編號(hào)：2130922
[Abstract]:The gas insulated metal sealing system (Gas Insulated Metal Enclosed System, GIS) with SF6 gas as insulating medium has the advantages of stable performance, high reliability, high transmission capacity, small loss and friendly environment. It has great application prospects in UHV transmission and offshore large-scale wind power transmission, such as.GIS in production, transportation, operation and so on. In the process, the metal particles will inevitably be produced due to the incontrollable factors such as equipment vibration, friction, desorption and so on. It has a serious effect on the insulation performance of GIS. 1) the metal particles deposited on the surface of the outer cavity will distort the electric field distribution and cause internal partial discharge; 2) the directional shift of the electric field forces in the cavity of the cavity. Moving, reducing gap distance, causing gap breakdown; 3) moving and attaching to the insulator surface, distorting the distribution of electric field on the surface of insulators and triggering the flashover along the surface. The related research shows that the internal insulation strength of the GIS can be reduced by 90% when there is metal particles in the surface, which seriously affects the stability and reliability of the operation of the external cavity. It is an important measure to restrain the movement of metal particles and improve the pollution of metal particles. After the film, the collision characteristics between the particles and the electrodes, the amount of charge and the lift voltage may change. This is a study in this paper. According to the principle of kinematics, the collision coefficient measurement platform is set up, and the collision recovery of the particles and the surface of the electrode after the film is studied. The influence of particle size, collision speed, film mulching material and film thickness on the impact coefficient is obtained, and the regression analysis is carried out. The experiment shows that the purpose of controlling the height of the particles after the collision between the particles and the electrode can be achieved by using the good hardness small elastic silicon rubber insulating layer. Based on the Faraday cage, the direct current voltage is set up. The influence law of the film on the charge quantity of the particles was obtained by the experimental platform of measuring the charge quantity of particles in the air. The charge quantity of the film (PET film, silicone rubber film, etc.) was measured by different electrodes. It was found that the film did not affect the final charge of the particles, but the charging time of the particles was prolonged. The conduction band between the particles and the film after the film was used. The results are explained by the motor theory. In this paper, the open lift test platform of metal particles after the film is established, and the starting voltage of the particles in the air under DC voltage is obtained. It is found that the film has obvious electrostatic adsorption on the particles, which makes the lift voltage obviously improved, and the effect of the material and thickness of the film on the lift voltage is studied. The experiment shows that the opening voltage of the silicon rubber film with the same thickness is larger than that of the PET film. With the increase of the thickness of the film, the lift voltage is increasing, but the effect is not obvious. It is found that the movement of the particles will be obviously weakened after the film mulching, and the particles will have the phenomenon of delay lifting and intermittent take-off. Finally, the paper points out the research. The existing deficiencies and problems to be solved are discussed. The prospect of harmless research on metal particle pollution in GIS is prospected.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM595
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 李慶民;王健;李伯濤;劉思華;陳超;李成榕;;GIS/GIL中金屬微粒污染問題研究進(jìn)展[J];高電壓技術(shù);2016年03期
2 李鵬;李志兵;孫倩;張喬根;顏湘蓮;孫建濤;;特高壓氣體絕緣金屬封閉輸電線路絕緣設(shè)計(jì)[J];電網(wǎng)技術(shù);2015年11期
3 齊波;張貴新;李成榕;高春嘉;張博雅;陳錚錚;;氣體絕緣金屬封閉輸電線路的研究現(xiàn)狀及應(yīng)用前景[J];高電壓技術(shù);2015年05期
4 律方成;金虎;王子建;張波;;主分量稀疏化在GIS局部放電特征提取中的應(yīng)用[J];電工技術(shù)學(xué)報(bào);2015年08期
5 王健;李慶民;李伯濤;陳超;;考慮非彈性隨機(jī)碰撞與SF_6/N_2混合氣體影響的直流GIL球形金屬微粒運(yùn)動(dòng)行為研究[J];中國(guó)電機(jī)工程學(xué)報(bào);2015年15期
6 王健;李慶民;李伯濤;陳超;劉思華;李成榕;;直流應(yīng)力下電極表面覆膜對(duì)金屬微粒啟舉的影響機(jī)理研究[J];電工技術(shù)學(xué)報(bào);2015年05期
7 王麗紅;冉兵;坎雜;李成松;;加工番茄籽碰撞接觸恢復(fù)系數(shù)的試驗(yàn)[J];江蘇大學(xué)學(xué)報(bào)(自然科學(xué)版);2015年01期
8 黃小毛;查顯濤;潘海兵;宗望遠(yuǎn);陳輝;;油菜籽粒點(diǎn)面接觸碰撞中恢復(fù)系數(shù)的測(cè)定及分析[J];農(nóng)業(yè)工程學(xué)報(bào);2014年24期
9 王成軍;李耀明;馬履中;馬征;;小麥籽粒碰撞模型中恢復(fù)系數(shù)的測(cè)定[J];農(nóng)業(yè)工程學(xué)報(bào);2012年11期
10 耿弼博;;GIS金屬顆粒放電發(fā)展的試驗(yàn)研究[J];電網(wǎng)與清潔能源;2011年07期
，本文編號(hào)：2130922
本文鏈接：http://sikaile.net/kejilunwen/dianlidianqilunwen/2130922.html
最近更新
教材專著
