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高頻變壓器的差動(dòng)保護(hù)</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??014-01-10 15:10:00</span>
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<p> <strong><a href="http://linhang.com.cn/product/product-0001,0015.shtml">高頻變壓??/a></strong>的差動(dòng)保護(hù)的核心問題是如何正確識(shí)別變壓器勵(lì)磁涌流和內(nèi)部故障電流。因?yàn)楦哳l變壓器在空載合閘或外部故障切除電壓恢復(fù)??會(huì)產(chǎn)生較大的勵(lì)磁涌流,如不加以識(shí)別,會(huì)導(dǎo)致差動(dòng)保護(hù)的誤動(dòng)作??/p>
<p> 差動(dòng)保護(hù)按照躲開最大不平衡電流進(jìn)行整定時(shí)，帶速飽和原理的差動(dòng)保護(hù)能夠減少非周期分量造成的保護(hù)誤動(dòng)，如BCH-2型就是一種增強(qiáng)型速飽和中間變流器的差動(dòng)保護(hù)。這種差動(dòng)保護(hù)的核心部分是帶短路線圈的飽和中間變流器和差動(dòng)電流繼電器。短路線圈的存在使得在具有非周期分量電流時(shí)繼電器的動(dòng)作電流大為增加，從而提高了躲避勵(lì)磁涌流和外部短路時(shí)暫態(tài)不平衡電流的性能??/p>
<p> 采用BCH-2型差動(dòng)保護(hù)要注意短路線圈匝數(shù)的確定匝數(shù)愈多躲避涌流的性能愈好，但內(nèi)部短路時(shí)繼電器的動(dòng)作延時(shí)就長(zhǎng)。對(duì)中小型變壓器，由于勵(lì)磁涌流倍數(shù)大，內(nèi)部故障時(shí)非周期分量衰減快，對(duì)保護(hù)動(dòng)作要求又較低，一般選較大的匝數(shù)，而對(duì)大型變壓器，內(nèi)部涌流倍數(shù)小，非周期分量衰減慢，又要求保護(hù)動(dòng)作快，則應(yīng)選較小的匝數(shù)??/p>
<p> 最后選用的抽頭是否合適，應(yīng)經(jīng)高頻變壓器空投試驗(yàn)來確定。同時(shí)，靈敏度檢驗(yàn)應(yīng)按內(nèi)部短路時(shí)最小短路電流來進(jìn)行。如不滿足要求，則應(yīng)選帶制動(dòng)特性的差動(dòng)保護(hù)?？偟膩碚f，帶速飽和原理的縱差保護(hù)由于動(dòng)作電流大，靈敏度低，并且在高頻變壓器內(nèi)部故障時(shí)，會(huì)由于非周期分量的存在而延遲動(dòng)作，已逐步被淘汰??/p>
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