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id="eqckvv83f" class="newstime"> <span id="eqckvv83f" class="skim"><em>瀏覽次數(shù)：</em>838</span><span id="eqckvv83f" class="skimtim"><em>發(fā)布日期：</em>2020-11-06 </span> </div> <div><span style="font-size: 16px;"><br /></span></div><div><span style="font-size: 16px;"> <span style="color: rgb(0, 0, 0);"><strong><a href="http:///Products-11427372.html" target="_blank"><span style="color: rgb(0, 0, 0);">油浸高壓試驗變壓器</span></a></strong></span>在運行中常見的故障有繞組、套管和分接開關(guān)及鐵芯、油箱及其它附件的故障等。</span></div><div><span style="font-size: 16px;"><br /></span></div><div><span style="font-size: 16px;"> 1、繞組故障</span></div><div><span style="font-size: 16px;"><br /></span></div><div><span style="font-size: 16px;"> 主要有匝間短路、繞組接地、相間短路，斷線及接頭開焊等。</span></div><div><span style="font-size: 16px;"><br /></span></div><div><span style="font-size: 16px;"> (1)匝間短路：由于繞組導(dǎo)線本身的絕緣損壞產(chǎn)生的短路故障。匝間短路故障的現(xiàn)象是產(chǎn)生匝間短路時，變壓器過熱油溫增高，電源側(cè)電流略有增大；有時油中有“吱吱”聲和“咕嘟”聲時咕嘟冒氣泡聲，嚴(yán)重時，油枕噴油；匝間短路故障產(chǎn)生的原因是變壓器運行長期過載使匝間絕緣損壞。</span></div><div><span style="font-size: 16px;"><br /></span></div><div><span style="font-size: 16px;"> （2）繞組接地：繞組接地是繞組對接地的部分短路。油浸式試驗變壓器繞組接地時，變壓器油質(zhì)變壞，長時間接地會使接地相繞組絕緣老化及損壞，繞組接地產(chǎn)生的原因，雷電大氣過電壓及操作過電壓的作用使繞組受到短路電流的沖擊發(fā)生變形，主絕緣損壞、折斷；變壓器油受潮后絕緣強度降低。</span></div><div><span style="font-size: 16px;"><br /></span></div><div><span style="font-size: 16px;"> （3）相間短路：相間短路是指繞組相間的絕緣被擊穿造成短路產(chǎn)生相間的短路時，變壓器油溫劇增，油枕噴油主變?nèi)齻?cè)開關(guān)掉閘，變壓器相間短路是由于變壓器的主絕緣老化絕緣降低，變壓器油擊穿電壓偏低，或者因其它故障擴大而引起的如繞組的匝間短路和接地故障，由于電弧及熔化的銅(鋁)粒子四散飛濺，使事故蔓延，擴大發(fā)展為相間短路，發(fā)生相間短路時應(yīng)立即匯報值班調(diào)度員和上級領(lǐng)導(dǎo)，并請檢修部門及時查清故障原因并處理，使變壓器盡快恢復(fù)運行。</span></div><div><span style="font-size: 16px;"><br /></span></div><div><span style="font-size: 16px;"> （4）繞組和引線斷線：繞組和引線斷線時，往往發(fā)生電弧使變壓器油分解、氣化有時造成相間短路，其原因多是由于導(dǎo)線內(nèi)部焊接不良，過熱而熔斷或匝間短路而燒斷以及短路應(yīng)力造成的繞組折斷。</span></div><div><span style="font-size: 16px;"><br /></span></div><div><span style="font-size: 16px;"> 2、套管故障</span></div><div><span style="font-size: 16px;"><br /></span></div><div><span style="font-size: 16px;"> 變壓器套管積垢，在大霧或小雨時造成污閃，油浸式試驗變壓器使變壓器高壓側(cè)單相接地或相間短路。</span></div><div><span style="font-size: 16px;"><br /></span></div><div><span style="font-size: 16px;"> 3、嚴(yán)重滲漏</span></div><div><span style="font-size: 16px;"><br /></span></div><div><span style="font-size: 16px;"> </span><strong style="font-size: 16px;">油浸高壓試驗變壓器</strong><span style="font-size: 16px;">運行滲漏油嚴(yán)重或連續(xù)從破損處不斷外溢以致油位計已看不到油位，此時應(yīng)立即將變壓器停用進(jìn)行補漏和加油，引起變壓器滲漏油的原因有焊縫開裂或密封件失效，運行中受到震動外力沖撞油箱銹蝕嚴(yán)重而破損等。</span></div><div><span style="font-size: 16px;"><br /></span></div><div><span style="font-size: 16px;"> 4、分接開關(guān)故障</span></div><div><span style="font-size: 16px;"><br /></span></div><div><span style="font-size: 16px;"> </span><strong style="font-size: 16px;">油浸高壓試驗變壓器</strong><span style="font-size: 16px;">常見的故障有分接開關(guān)接觸不良或位置不準(zhǔn)，觸頭表面熔化與灼傷及相間觸頭放電或各分接頭放電。</span></div><div><span style="font-size: 16px;"><br /></span></div><div><span style="font-size: 16px;"> （1）無載分接開關(guān)故障：無載分接開關(guān)彈簧壓力不足滾輪壓力不均，接觸不良，有效接觸面積減小，此外，開關(guān)接觸處存在油污，接觸電阻增大，在運行時將引起分接頭接觸面燒傷，若引出線連接或焊接不良，當(dāng)受到短路電流沖擊時將導(dǎo)致分接開關(guān)發(fā)生故障，油浸式試驗變壓器由于分接開關(guān)編號錯誤，電壓調(diào)節(jié)后達(dá)不到預(yù)定的要求，導(dǎo)致三相電壓不平衡，產(chǎn)生環(huán)流，增加損耗，引起變壓器故障。分接開關(guān)分接頭板的相間絕緣距離不夠，絕緣材料上有油泥堆積成受潮，當(dāng)發(fā)生過電壓時，也將使分接開關(guān)相間短路發(fā)生故障。</span></div><div><span style="font-size: 16px;"><br /></span></div><div><span style="font-size: 16px;"> 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