交流輸電(dian)(dian)線(xian)(xian)路的(de)電(dian)(dian)暈損失主(zhu)要與(yu)導(dao)(dao)(dao)線(xian)(xian)表(biao)(biao)面(mian)(mian)(mian)場強(qiang)和(he)天(tian)氣(qi)有(you)關，根據(ju)絕(jue)緣水平要求確定(ding)了(le)相間距離后，導(dao)(dao)(dao)線(xian)(xian)表(biao)(biao)面(mian)(mian)(mian)場強(qiang)主(zhu)要與(yu)導(dao)(dao)(dao)線(xian)(xian)分(fen)裂數、分(fen)裂間距和(he)子導(dao)(dao)(dao)線(xian)(xian)直徑(jing)(jing)有(you)關，分(fen)裂數越多，子導(dao)(dao)(dao)線(xian)(xian)直徑(jing)(jing)越大，表(biao)(biao)面(mian)(mian)(mian)場強(qiang)越小(xiao)。擴徑(jing)(jing)導(dao)(dao)(dao)線(xian)(xian)通(tong)過支撐(cheng)鋁線(xian)(xian)疏繞的(de)方式擴大了(le)導(dao)(dao)(dao)線(xian)(xian)外徑(jing)(jing)，這樣可(ke)減小(xiao)導(dao)(dao)(dao)線(xian)(xian)表(biao)(biao)面(mian)(mian)(mian)的(de)電(dian)(dian)場強(qiang)度(du)和(he)電(dian)(dian)暈放電(dian)(dian)，降低(di)噪(zao)聲(sheng)，減少對無(wu)線(xian)(xian)電(dian)(dian)的(de)干擾。

相對(dui)于(yu)常規導(dao)線(xian)，擴徑(jing)(jing)導(dao)線(xian)重量(liang)較輕，安裝敷設后(hou)的(de)塑蠕伸(shen)長減(jian)小，導(dao)線(xian)永久(jiu)變形(xing)減(jian)少，在滿足輸送容量(liang)要(yao)求(qiu)和(he)環(huan)境保護指標的(de)前提下，可大幅降低(di)線(xian)路整體造價。簡(jian)單(dan)說來，擴徑(jing)(jing)導(dao)線(xian)是從常規導(dao)線(xian)中抽(chou)取數(shu)股鋁線(xian)后(hou)繞制而(er)成的(de)。

分裂導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)是由(you)(you)三根(gen)或四根(gen)單芯導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)經過某種工藝制造在一(yi)起的一(yi)種可(ke)分裂的導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)，或者(zhe)稱導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)束，這種分裂導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)不僅(jin)僅(jin)是形式上與常規(gui)導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)不同，由(you)(you)于分裂導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)可(ke)使導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)周(zhou)圍(wei)磁場分布改變，從而等效地增大了(le)導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)半徑，減小(xiao)了(le)導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)電(dian)(dian)抗(kang)；同時也(ye)改變了(le)導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)周(zhou)圍(wei)的電(dian)(dian)場分布，使導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)的電(dian)(dian)納也(ye)相應增大。