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更新時(shí)間：2023-09-11</div> <div id="1571n5fppxr7" class="inside_rnewcon"><p><strong><span>變比組別測(cè)試儀試驗(yàn)的意義及注意事項(xiàng)</span></strong></p><p><span>測(cè)量電壓比的目的：</span></p><p><span><br/></span></p><p><span>(1)檢查變壓器、互感器繞組數(shù)比的正確性，用來(lái)檢查是否存在間或?qū)娱g短路；</span></p><p><span><br/></span></p><p><span>(2)檢查變壓器分接開(kāi)關(guān)檔位是否正確；</span></p><p><span><br/></span></p><p><span>(3)獲得準(zhǔn)確的變比值，判斷變壓器是否可以并聯(lián)運(yùn)行；</span></p><p><span><br/></span></p><p><span>例如：當(dāng)兩臺(tái)并列運(yùn)行的變壓器二次側(cè)空載電壓相差為額定電壓的1%時(shí)，兩臺(tái)變壓器中的環(huán)流將達(dá)到額定電流的10%左右，增加了變壓器的損耗，占據(jù)了變壓的容量，因此變壓器的變比誤差應(yīng)該限制在一定范圍內(nèi)。</span></p><p><span> 測(cè)量變壓器聯(lián)接組別的目的</span></p><p><span></span></p><p style="text-align: center"><img style="max-width: 800px; max-height: 300%; width: 382px; height: 401px;" src="https://img56.chem17.com/9/20230911/638300182350073245543.png" title="0H[)2`PP$IDUFD6DEHED.png" alt="0H[)2`PP$IDUFD6DEHED.png" width="382" height="401"/></p><p><span></span><br/></p><p><span>變壓器接線組別是并列運(yùn)行的重要條件之一，若參加并列運(yùn)行的變壓器接線組別不致，將出現(xiàn)不能允許的環(huán)流。因此,在變壓器出廠、交接和繞組大修后都應(yīng)測(cè)量繞組的接線組別，用以判斷繞組引出線、高低壓相位差是否正確。</span></p><p><span><br/></span></p><p><span>1、電壓變比值：</span></p><p><span><br/></span></p><p><span>變壓器的電壓比是指變壓器空載運(yùn)行時(shí)，一次側(cè)電壓U1與二次側(cè)電壓U2的比值簡(jiǎn)稱電壓比( 或變比)，即：K=U1/U2。</span></p><p><span><br/></span></p><p><span>2、電壓變比誤差：</span></p><p><span><br/></span></p><p><span>變比誤差=(實(shí)測(cè)變比值-額定變比值 )/額定變比值x100%</span></p><p><span><br/></span></p><p><span>3、連接組別 :</span></p><p><span><br/></span></p><p><span>連接組標(biāo)號(hào)是表示變壓器繞組的連接方法以及原、副邊對(duì)應(yīng)線電勢(shì)相位關(guān)系的符號(hào)連接組標(biāo)號(hào)由字符和數(shù)字兩部分組成，前面的字符自左向右依次表示高壓、低壓繞組的連接方法，后面的數(shù)字可以是0~11之間的整數(shù)，它代表低壓繞組線電勢(shì)對(duì)高壓繞組線電勢(shì)相位移的大小，該數(shù)字乘以30°即為低壓邊線電勢(shì)滯后于高壓邊線電勢(shì)相位移的角度數(shù)。這種相位關(guān)系通常用“時(shí)鐘表示法"加以說(shuō)明，即以原邊線電勢(shì)相量做為時(shí)鐘的分針，并令其固定指向12位置，以對(duì)應(yīng)的副邊線電勢(shì)相量做為時(shí)針，它所指的時(shí)數(shù)就是連接組標(biāo)號(hào)中的數(shù)字。</span></p><p><span><br/></span></p><p><span>變比組別測(cè)試儀試驗(yàn)注意事項(xiàng)</span></p><p><span><br/></span></p><p><span>1、儀器高壓測(cè)試線接變壓器或者互感器的高壓側(cè)，低壓測(cè)試線接低壓側(cè)，勿接反。</span></p><p><span><br/></span></p><p><span>2、高低壓測(cè)試線的黃綠紅黑測(cè)試夾，分別與變壓器的ABCO連接，遇到不用的測(cè)試夾應(yīng)將其懸空。切勿使測(cè)試線顏色與相別不對(duì)應(yīng)，否則會(huì)出現(xiàn)測(cè)試組別值不正確的現(xiàn)象。</span></p><p><span><br/></span></p><p><span>3、高壓測(cè)試線為儀器測(cè)試電源(最高AC160V)輸出端，禁止相間直接短路，否則會(huì)損壞儀器。測(cè)試時(shí)注意安全，防止觸電。</span></p><p><span><br/></span></p><p><span>4、測(cè)試夾與被試品端子可靠連接，如遇到銹跡或氧化層需進(jìn)行處理，以免影響測(cè)試結(jié)果。</span></p><p><span><br/></span></p><p><span>5、測(cè)試接線前，被試品的高低壓側(cè)端子的對(duì)外引線要拆除或處于懸空狀態(tài)，以免影響測(cè)試結(jié)果。</span></p><p><br/></p></div> 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