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高頻變壓器的差動保護(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
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<p> <strong><a href="http://m.cmqp.com.cn/product/product-0001,0015.shtml">高頻變壓??/a></strong>的差動保護(hù)的核心問題是如何正確識別變壓器勵磁涌流和內(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)??會產(chǎn)生較大的勵磁涌流,如不加以識別,會導(dǎo)致差動保護(hù)的誤動作??/p>
<p> 差動保護(hù)按照躲開最大不平衡電流進(jìn)行整定時，帶速飽和原理的差動保護(hù)能夠減少非周期分量造成的保護(hù)誤動，如BCH-2型就是一種增強(qiáng)型速飽和中間變流器的差動保護(hù)。這種差動保護(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繼電器的動作電流大為增加，從而提高了躲避勵磁涌流和外部短路時暫態(tài)不平衡電流的性能??/p>
<p> 采用BCH-2型差動保護(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)部短路時繼電器的動作延時就長。對中小型變壓器，由于勵磁涌流倍數(shù)大，內(nèi)部故障時非周期分量衰減快，對保護(hù)動作要求又較低，一般選較大的匝數(shù)，而對大型變壓器，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，靈敏度檢驗(yàn)應(yīng)按內(nèi)部短路時最小短路電流來進(jìn)行。如不滿足要求，則應(yīng)選帶制動特性的差動保護(hù)?？偟膩碚f，帶速飽和原理的縱差保護(hù)由于動作電流大，靈敏度低，并且在高頻變壓器內(nèi)部故障時，會由于非周期分量的存在而延遲動作，已逐步被淘汰??/p>
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