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晨飞资讯</a> » <a href="/Article/gaopinbianyaqiloudia_1.html">高频变压器漏电的基础知识</a></div>
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高频变压器漏电的基础知识</h3>
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<span>文章出处?a href=""><a href="http://cfdz.nsw888.com">深圳市晨飞电子有限公?/a></a></span><span>网责任编辑：<a href="http://cfdz.nsw888.com">NSW</a></span><span>作者：<a href="http://cfdz.nsw888.com">NSW</a></span><span>人气?span
id="cntrHits">-</span></span><span>发表时间?015-03-23 09:42:00</span>
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<p> <span style="font-size: 14px">源中性点接地系统三相五线制网络中漏电保护，用电设备绝缘正常的情况下，单相用电设备投入运行后，将发生零序不平衡电流，IN流过中性线，其值为IN=IA +IB+Ic?#电机A相绝缘击穿且单相用电设备也投入运行时，有以下关系式：IA +IB+Ic=IN+ILIL=IL1+I12+I13式中IN-不平衡电流，以中性线为回路。IL漏电电流，分别以IL1I12I13路径为回路。I1各相零序漏电流之和经对照可以看出，末端维护的漏电流最佳维护点共有三处?/span></p>
<p> </p>
<p><span style="font-size: 14px"> 干线上测定A、B、C、N四根线电流相量之和得IL=IA +IB+IC-IN显然应该用四线零序电流互感器测定，本相用电设备进线端测A、B、C、三相线电流相量之和得：IL=IA I+IBI，显然，应采用三线零序电流互感器测零序电流，同样，单相用电设备进线端用二线电流互感器测零序电流。电机底坐及接地支线?/span></p>
<p> </p>
<p><span style="font-size: 14px"> 电源中性线接地的三相四线制网络中漏电电流测点，工厂中离变电所远的生产车间，民用建筑等，均用三相四线制接线方式，中性线兼作维护接零干线，全面设备绝缘正常而单相用电设备投运的情况下，不平衡电流在中性线上发生电压降，该电压降直接加于各电机外壳与大地之间，不平衡电流中之微小局部以大地为回路。当1#电机A相绝击穿且单相用电设备投入运行时，不平衡电流IN?#电机漏电流IL共同路径为中性线?/span></p>
<p> </p>
<p><span style="font-size: 14px"> 末端维护漏电流量最佳维护点共有三处：a.用四线零序电流互感器接于枝接用电设备的干点之后。b.用三线零序电流互感器接于用电设备的进线端。c.电机机座及接零支线?/span></p>
<p> </p>
<p><span style="font-size: 14px"> 测漏电流的接线如下：电源中性点不接地的三相三线制系统中，用三线零序电流互感器接于干线始端的A、B、C相导线上。电源中性点接地的三相五线制系统中，干线的漏电流测点，用四线零序电流互感器接于干线始终的A、B、C、N四根导线上。电源中性点接地的三相四线制系统中，如果干线枝接的负载全部是三相对称负荷，则应该用三线零序电流互感器接于干线始端的A、B、C相导线上。电源中性点接地的三相四线制系统中，如果干线上接有不对称负荷，应该用纵差动式接线测定漏电流，漏电维护装置若用纵联差动式接线称为差动式漏电维护器。L1和L2之间的干线与支线均无漏电流时，漏电断路器不动作，当Ll与L2之间时干线或支线有漏电流IL时，漏电断路器DL切断故障电路?/span></p>
<p> </p>
<p><span style="font-size: 14px"> 综上所述，都是关于</span><strong><a href="http://www.chenfeipower.com/Products/gongmoxianquan.html"><span style="font-size: 14px">高频变压?/span></a></strong><span style="font-size: 14px">的漏电原因解说，仅供参考，希望能够帮助到你?/span></p>
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