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<h3>
你知道高頻變壓器燒壞的原因是什么嗎?</h3>
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<span>文章出處??a href=""><a >深圳市晨飛電子有限公??/a></a></span><span>網(wǎng)責(zé)任編輯：<a >NSW</a></span><span>作者：<a >NSW</a></span><span>人氣??span
id="cntrHits">-</span></span><span>發(fā)表時(shí)間??014-12-15 09:59:00</span>
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<p> <span style="font-size: 16px">電力系統(tǒng)中，低壓變壓器的燒毀是經(jīng)常呈現(xiàn)的故障。隨著農(nóng)村電網(wǎng)建設(shè)與改造工程的實(shí)施和電力體制改革的深入開(kāi)展，配電變壓器的產(chǎn)權(quán)已歸屬于供電部門所有。然而配電變壓器燒毀不只僅只是會(huì)造成地區(qū)大面積停電，更為嚴(yán)重的會(huì)使供電部門向社會(huì)承諾的供電可靠率得不到充沛保證，影響電力形象??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 一、變壓器燒毀原因</span></p>
<p> </p>
<p><span style="font-size: 16px"> 1、鐵心多點(diǎn)接地??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 1)l0kV配電變壓器鐵心多點(diǎn)接地是很不容易被發(fā)現(xiàn)和測(cè)試的，這主要是因?yàn)樽儔浩鞯蔫F心接地是內(nèi)部用一塊很薄的紫色銅片一頭夾在鐵??硅鋼??之間，另一頭則壓在鐵心夾板上與變壓器外殼直接連接??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 2)鐵心硅鋼片之間涂有絕緣漆，但其絕緣電阻很小，只能隔斷渦流而不能阻止高壓感應(yīng)電流。如果硅鋼片表面上的絕緣漆因自然老化，會(huì)產(chǎn)生很大的渦流損耗，增加鐵心的局部過(guò)熱，損壞變壓器??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 3)當(dāng)配電變壓器低壓側(cè)發(fā)生接地、相間短路時(shí)，將發(fā)生一個(gè)高于額定電??0-30倍的短路電流，這么大的電流作用在高壓繞組上，線圈內(nèi)部將產(chǎn)生很大的機(jī)械應(yīng)力，這種機(jī)械應(yīng)力將導(dǎo)致線圈壓縮，短路故障解除后應(yīng)力也隨著消失，線圈如果重復(fù)受到機(jī)械應(yīng)力的作用后，其絕緣膠珠、膠墊等就會(huì)松動(dòng)脫落，鐵心夾板螺絲也會(huì)稍微松弛，高壓線圈畸變或崩裂。另外也會(huì)發(fā)生高出允許溫升幾倍的溫度，從而導(dǎo)致變壓器在極短的時(shí)間內(nèi)燒毀??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 2、人為的損壞??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 1)</span><strong><a href="http://m.linhang.com.cn/Products/gongmoxianquan.html"><span style="font-size: 16px">高頻變壓??/span></a></strong><span style="font-size: 16px">的引出線是銅螺桿，而架空線一般多采用鋁芯膠皮線，這樣在空氣中銅鋁之間是很容易發(fā)生電化腐蝕的電離作用下，銅鋁之間形成氧化膜，使其接觸電阻增大，引線處將螺桿、螺帽及引線燒壞或熔在一起??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 2)套管閃絡(luò)放電也是變壓器罕見(jiàn)的外表異常現(xiàn)象之一，空氣中有導(dǎo)電性能的金屬塵埃附吸在套管表面上，若遇上雨雪濕潤(rùn)天氣，電網(wǎng)系統(tǒng)諧振，遭受雷擊過(guò)電壓時(shí)，就會(huì)發(fā)生套管閃絡(luò)放電或爆炸??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 3)緊固或松動(dòng)變壓器的引線螺帽時(shí)，用力不均使導(dǎo)電螺桿跟著轉(zhuǎn)動(dòng)，導(dǎo)致變壓器內(nèi)部高壓線圈引線扭斷或低壓引出的軟銅片相碰造成相間短路??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 4)吊芯檢修時(shí)沒(méi)有按檢修規(guī)程及工藝規(guī)范進(jìn)行，經(jīng)常不慎將線圈、引線、分接開(kāi)關(guān)等處的絕緣破壞或?qū)⒐ぞ哌z忘在變壓器內(nèi)，輕則發(fā)生閃爍放電現(xiàn)象，重則短路接地，損壞變壓器??配電變壓器高、低壓兩側(cè)無(wú)保險(xiǎn)。有的雖然已經(jīng)裝上跌落式熔斷器和羊角保險(xiǎn)，但其熔絲多是采用鋁或銅絲代替，致使低壓短路或過(guò)載時(shí)，熔絲無(wú)法正常熔斷而燒毀變壓器??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 5)配電變壓器的高、低熔絲配置不當(dāng)，變壓器上的熔絲普遍存在著配置過(guò)大的現(xiàn)象，從而造成了配電變壓器嚴(yán)重過(guò)載時(shí)，燒毀變壓器??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 6)由于??/span><span style="font-size: 16px">村照明線路較多，大多數(shù)又是采用單相供電，再加上施工中跳線的隨意性和管理不到位，造成了配變負(fù)荷的偏相運(yùn)行。臨時(shí)使用，致使某相線圈絕緣老化而燒毀變壓器??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 3、分接開(kāi)關(guān)??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 1)私自調(diào)節(jié)分接開(kāi)關(guān)，由于冬夏兩季的用電負(fù)荷差別大，電壓的高低變化大。因而有些農(nóng)村和企業(yè)的電工不經(jīng)電力修試部門試驗(yàn)調(diào)整而私自調(diào)節(jié)分接開(kāi)關(guān)，造成配變分接開(kāi)關(guān)不到位，接觸不良而燒毀??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 2)分接開(kāi)關(guān)質(zhì)量差，結(jié)構(gòu)不合理，壓力不夠，接觸不可靠，外部字輪位置與內(nèi)部實(shí)際位置不完全一致，引起星形動(dòng)觸頭位置不完全接觸，錯(cuò)位的動(dòng)、靜觸頭使兩抽頭之間的絕緣距離變小，并在兩抽頭之間的電勢(shì)作用下發(fā)生短路或?qū)Φ胤烹?，短路電流很快就?huì)把抽頭線匝燒毀，甚至導(dǎo)致整個(gè)繞組損壞??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 3)滲油是變壓器最為罕見(jiàn)的</span><span style="font-size: 16px">外表異常現(xiàn)象，由于變壓器本體內(nèi)充滿了油，各連接部位處都有膠珠、膠墊以防止油的滲漏。經(jīng)過(guò)長(zhǎng)時(shí)間的運(yùn)行，會(huì)使變壓器中的某些膠珠、膠墊老化龜裂而引起滲油，從而導(dǎo)致絕緣受潮后性能下降，放電短路，燒毀變壓器??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 4)配電變壓器的高、低壓線路大多數(shù)是由架空線路引入，由于避雷器投運(yùn)不及時(shí)或 沒(méi)有裝置10kV避雷器，造成雷擊時(shí)燒毀變壓器??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 5)一些配電變壓器沒(méi)有配置一級(jí)維護(hù)，或者是配置了一級(jí)維護(hù)但其動(dòng)作性、可靠性極低，有的甚至根本不能動(dòng)作??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 綜上所述，配電變壓器燒毀的原因是多方面的有的自然所致，有的則是人為所造成的??/span></p>
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