【正文】
的防雷措施如下: 要提高配電線路的絕緣水平通過更換50%U 擊穿電壓更高的絕緣子、保留一定的絕緣長(zhǎng)度、維持一定的濕度,根據(jù)試驗(yàn)結(jié)果顯示,P15 絕緣子的50%U 擊穿電壓比 P10 絕緣子的50%U 擊穿電壓高 %,P20 絕緣子的50%U擊穿電壓比 P15絕緣子的50%U 擊穿電壓高 22%,X45 絕緣子的50%U 擊穿電壓比 P20 絕緣子的50%U 擊穿電壓高 %,復(fù)合絕緣子的絕緣長(zhǎng)度為177mm,瓷橫擔(dān)絕緣子的濕度為40kg/,由此可見,使用50%U 擊穿電壓高的絕緣子、保留一定絕緣長(zhǎng)度、維持一定濕度可以提高線路的絕緣水平,增強(qiáng)配電線路的耐雷水平。 在架空絕緣導(dǎo)線200mm距離內(nèi)安裝引弧電極可以防止雷擊斷線。正常運(yùn)行時(shí)由于引弧電極與絕緣子鋼腳法蘭處或接地電極有較大的空氣間隙,而無電流通過;當(dāng)雷電發(fā)生時(shí)導(dǎo)線的雷電感應(yīng)過電壓超過一定數(shù)值時(shí)或遭遇直擊雷時(shí),在引弧電極和接地電極之間引起閃絡(luò),形成通道,持續(xù)的工頻電弧便在防雷接地線的引弧電極和接地電極或絕緣子鋼腳法蘭之間上燃燒,釋放過電壓能量,以保護(hù)導(dǎo)線免于燒傷斷線。 采用保護(hù)間隙。保護(hù)間隙首先放電,最好不會(huì)涉及到絕緣子,并引導(dǎo)雷電流入地,保護(hù)絕緣子串不會(huì)閃絡(luò)和架空線路不被燒毀,還有保護(hù)間隙與架空線路的絕緣配合也要保證在線路的最大操作過電壓下的安全性,線路絕緣水平不會(huì)降低。如果配電線路采用加裝保護(hù)間隙的保護(hù)措施,那么保護(hù)間隙與自動(dòng)重合閘裝置配合使用。 把保護(hù)間隙并聯(lián)在絕緣子串的兩極,當(dāng)雷電擊中線路時(shí),必須是保護(hù)間隙先放電, 將產(chǎn)生的雷電流及時(shí)地導(dǎo)入地下,因此絕緣子不會(huì)被閃絡(luò)燒毀,保證了線路供電的可靠性和安全性。 安裝避雷器。在配電線路中安裝免維護(hù)氧化鋅避雷器,有選擇的安裝在配電線路的易擊段以及相應(yīng)的配電設(shè)備(配電變壓器、柱上開關(guān)等)上,對(duì)配電線路進(jìn)行安全全面的保護(hù)。 參考文獻(xiàn)[1]秦冰,徐永玲,[J].研究與分析:2008,35(11):1317.[2]范耀升??萍紕?chuàng)新與應(yīng)用:2012,5,126[3]陳俊,[J].電力設(shè)備,2007,8(8):5155[4]黃蘭英。,2009,5:45[5]百度文庫[6][J].技術(shù)與管理,5152[7]張之幃,王樹山,魏繼峰,:2010,4,30(4):387388[8]:中國水利水電出版社,2006,210350[9][20][J].長(zhǎng)沙理工大學(xué),2009年,17—18[10]田洪,陳天翔,孫園,[J].廈門理工學(xué)院學(xué)報(bào),2012年9月,第20卷,第3冊(cè),51—52[11]中國知網(wǎng),在工頻和沖擊電壓下, [12]陳勉,吳碧華,“疏導(dǎo)”型思想的防雷保[J]. 廣東電力,2001,14(4):3637,58[13][J].重慶大學(xué),2011,4:1[14]陳錫陽,尹創(chuàng)榮,葛棟,[J].高壓電工,2012,2,第48卷,第2期:6061[15]莫付江,陳允平,2005,29(6):7377[16]侯牧武 , 曾嶸 , 何金良 . 感應(yīng)過電壓對(duì)輸電線路耐雷水平的影響 . 電網(wǎng)技術(shù),2004,28(12):4649[17] IEEE Std1410:2004, IEEE Guide for Improving the Lightning Performance of Electric Power Overhead Distribution Lines [S][18]NUCCI C A, RACHIDI F, IANOZ M V, et alLightninginduced Voltages on Overhead Lines [J]IEEE Transon EMC,1993,35(1):7586[19]侯牧武 , 曾嶸 , 何金良 . 感應(yīng)過電壓對(duì)輸電線路耐雷水平的影響 . 電網(wǎng)技術(shù),2004,28(12):4649[21]黃蘭英,吳廣寧,曹曉斌, ,2009,32(5):6667[22]王茂成 ,呂永麗 ,鄒洪英 .10kV 絕緣導(dǎo)線雷擊斷線機(jī)理分析和防治措施 .高電壓技術(shù),2007,33(1):102105致謝首先感謝我的指導(dǎo)老師王少夫老師!在整個(gè)論文的開題、中期指導(dǎo)、后期修改過程中,王老師都對(duì)我嚴(yán)格要求、尊尊教導(dǎo),王老師以他豐富的教學(xué)經(jīng)驗(yàn)、淵博的專業(yè)學(xué)識(shí)、嚴(yán)謹(jǐn)?shù)闹螌W(xué)態(tài)度,給我留下了不可磨滅的印象,對(duì)我以后的學(xué)習(xí)、工作、生活產(chǎn)生了深遠(yuǎn)的影響。在此向尊敬的老師在學(xué)業(yè)和生活上給予我的教誨與關(guān)懷表示感謝,向尊敬的老師送上誠摯、美好的祝福。同時(shí)感謝在大學(xué)生活四年中給予我?guī)椭椭С值年惥杲淌凇=淌?、閆改珍老師、張平娟老師、范智平老師和張海濤等諸位老師,感謝09(2)班同學(xué)的大力支持,西苑四號(hào)二樓的兄弟朋友不管在學(xué)習(xí)上還是生活上都給了我莫大支持,向他們表示感謝。特別是我的班主任陳娟教授,在大一的暑假在生活的挫折中給了我巨大的勇氣,特別向她表示感謝。最后,還要感謝我的父母,是他們不管在學(xué)習(xí)還是生活上,都大力支持我,感謝他們默默無私的愛。ABSTRACT 10KV Distribution lines as a low voltage overhead lines in general no special protection measures, often used as the power system closer to the user39。s level. Because of the lack of lowvoltage distribution line lightning protection measures, relatively easy to produce lines blown by lightning, power outages and other power tripping accidents. The data show that, 10KV distribution lines, frequent lightning disturbance serious harm to the distribution network reliability and grid security, directly affect the people39。s production and life, the growth of the national economy a huge reaction. Interests and the people from the country39。s prehensive in terms of healthy living, research 10KV distribution line lightning protection measures have important practical engineering significance. This article mainly analyzes the principle of insulator flashover damage, overhead insulated conductor and parallel gap lightning break principle mechanism for insulators impulse discharge test, overhead insulated conductors and insulators in parallel gap breakdown test laboratory testing, such as testing and test chamber data analysis, correlation analysis seeks to identify the impact of different insulators, wires, and other mine clearance of the main factors, and thus raise the main factors for these lightning protection measures. Found through experiments, insulators used U50% higher discharge voltage line insulators help to improve the insulation level, and enhance the level of distribution lines Lightning。 insulator contamination case in a thunderstorm, the insulation level of the line will result in a decline。 insulator strike wear broadly in line voltage and insulation length linear relationship between length and generally 177mm insulation for the best。 at the same humidity, dry U50% breakdown voltage insulator than wet much higher breakdown voltage U50%。 the insulator humidity reaches a certain degree, humidity insulation breakdown in itself is not a major factor. Insulated wire insulator breakdown occurred at a distance of less than 200mm axis, so long as this within the lightning protection measures to strengthen the insulated conductors, in particular, at the junction insulation, which can prevent lightning disconnected. Parallel gap and the wire regardless of the type, that is, whether bare or insulated conductor wire, the insulator under the same model, the gap distance will not change, and the parallel distance of the gap insulators and insulator impulse discharge voltage. Key words: 10kv distribution lines。 Insulator。 Insulated wire。 Parallel Gap。 Lightning protection measures