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高頻變壓器漏電的基礎(chǔ)知識(shí)</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> <span style="font-size: 14px">源中性點(diǎn)接地系統(tǒng)三相五線制網(wǎng)絡(luò)中漏電保護(hù)，用電設(shè)備絕緣正常的情況下，單相用電設(shè)備投入運(yùn)行后，將發(fā)生零序不平衡電流，IN流過中性線，其值為IN=IA +IB+Ic??#電機(jī)A相絕緣擊穿且單相用電設(shè)備也投入運(yùn)行時(shí)，有以下關(guān)系式：IA +IB+Ic=IN+ILIL=IL1+I12+I13式中IN-不平衡電流，以中性線為回路。IL漏電電流，分別以IL1I12I13路徑為回路。I1各相零序漏電流之和經(jīng)對(duì)照可以看出，末端維護(hù)的漏電流最佳維護(hù)點(diǎn)共有三處??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 干線上測(cè)定A、B、C、N四根線電流相量之和得IL=IA +IB+IC-IN顯然應(yīng)該用四線零序電流互感器測(cè)定，本相用電設(shè)備進(jìn)線端測(cè)A、B、C、三相線電流相量之和得：IL=IA I+IBI，顯然，應(yīng)采用三線零序電流互感器測(cè)零序電流，同樣，單相用電設(shè)備進(jìn)線端用二線電流互感器測(cè)零序電流。電機(jī)底坐及接地支線??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 電源中性線接地的三相四線制網(wǎng)絡(luò)中漏電電流測(cè)點(diǎn)，工廠中離變電所遠(yuǎn)的生產(chǎn)車間，民用建筑等，均用三相四線制接線方式，中性線兼作維護(hù)接零干線，全面設(shè)備絕緣正常而單相用電設(shè)備投運(yùn)的情況下，不平衡電流在中性線上發(fā)生電壓降，該電壓降直接加于各電機(jī)外殼與大地之間，不平衡電流中之微小局部以大地為回路。當(dāng)1#電機(jī)A相絕擊穿且單相用電設(shè)備投入運(yùn)行時(shí)，不平衡電流IN??#電機(jī)漏電流IL共同路徑為中性線??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 末端維護(hù)漏電流量最佳維護(hù)點(diǎn)共有三處：a.用四線零序電流互感器接于枝接用電設(shè)備的干點(diǎn)之后。b.用三線零序電流互感器接于用電設(shè)備的進(jìn)線端。c.電機(jī)機(jī)座及接零支線??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 測(cè)漏電流的接線如下：電源中性點(diǎn)不接地的三相三線制系統(tǒng)中，用三線零序電流互感器接于干線始端的A、B、C相導(dǎo)線上。電源中性點(diǎn)接地的三相五線制系統(tǒng)中，干線的漏電流測(cè)點(diǎn)，用四線零序電流互感器接于干線始終的A、B、C、N四根導(dǎo)線上。電源中性點(diǎn)接地的三相四線制系統(tǒng)中，如果干線枝接的負(fù)載全部是三相對(duì)稱負(fù)荷，則應(yīng)該用三線零序電流互感器接于干線始端的A、B、C相導(dǎo)線上。電源中性點(diǎn)接地的三相四線制系統(tǒng)中，如果干線上接有不對(duì)稱負(fù)荷，應(yīng)該用縱差動(dòng)式接線測(cè)定漏電流，漏電維護(hù)裝置若用縱聯(lián)差動(dòng)式接線稱為差動(dòng)式漏電維護(hù)器。L1和L2之間的干線與支線均無漏電流時(shí)，漏電斷路器不動(dòng)作，當(dāng)Ll與L2之間時(shí)干線或支線有漏電流IL時(shí)，漏電斷路器DL切斷故障電路??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 綜上所述，都是關(guān)于</span><strong><a href="http://linhang.com.cn/Products/gongmoxianquan.html"><span style="font-size: 14px">高頻變壓??/span></a></strong><span style="font-size: 14px">的漏電原因解說，僅供參考，希望能夠幫助到你??/span></p>
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