擴徑導(dao)線(xian)是以(yi)滿足技術條件的(de)(de)常規(gui)導(dao)線(xian)規(gui)格為基(ji)準，采取擴大導(dao)線(xian)外徑技術，在保證電暈所要(yao)求的(de)(de)導(dao)線(xian)外徑前(qian)提下，減少(shao)導(dao)線(xian)的(de)(de)鋁截(jie)面，從(cong)而減少(shao)導(dao)線(xian)的(de)(de)總重量，減少(shao)鐵塔荷載和(he)結構(gou)重量，極大地降低線(xian)路造價。

當線(xian)(xian)路(lu)的(de)(de)電壓超過220kv時(shi)，為(wei)了降低線(xian)(xian)路(lu)電抗和電暈損耗，通(tong)常(chang)采用擴(kuo)徑導(dao)(dao)線(xian)(xian)。擴(kuo)徑導(dao)(dao)線(xian)(xian)就(jiu)是把普(pu)通(tong)的(de)(de)導(dao)(dao)線(xian)(xian)做(zuo)(zuo)成中空（里面用多股(gu)芯線(xian)(xian)和支撐(cheng)層做(zuo)(zuo)成）或者減少其(qi)中部(bu)分層單(dan)線(xian)(xian)數量（使該(gai)層單(dan)線(xian)(xian)間存在一定數量空隙），最終(zhong)達(da)到增加導(dao)(dao)線(xian)(xian)的(de)(de)等效半(ban)徑的(de)(de)目(mu)的(de)(de)。

交流輸電(dian)線(xian)(xian)(xian)(xian)路的(de)電(dian)暈損失(shi)主要(yao)(yao)與導(dao)(dao)線(xian)(xian)(xian)(xian)表(biao)面(mian)場強(qiang)(qiang)和天氣有(you)關(guan)，根據絕緣水(shui)平要(yao)(yao)求確定了(le)相(xiang)間距離后(hou)，導(dao)(dao)線(xian)(xian)(xian)(xian)表(biao)面(mian)場強(qiang)(qiang)主要(yao)(yao)與導(dao)(dao)線(xian)(xian)(xian)(xian)分(fen)裂(lie)數(shu)、分(fen)裂(lie)間距和 子導(dao)(dao)線(xian)(xian)(xian)(xian)直徑(jing)有(you)關(guan)，分(fen)裂(lie)數(shu)越(yue)多，子導(dao)(dao)線(xian)(xian)(xian)(xian)直徑(jing)越(yue)大(da)， 表(biao)面(mian)場強(qiang)(qiang)越(yue)小(xiao)(xiao)。擴徑(jing)導(dao)(dao)線(xian)(xian)(xian)(xian)通過支撐鋁線(xian)(xian)(xian)(xian)疏(shu)繞(rao)的(de)方式 擴大(da)了(le)導(dao)(dao)線(xian)(xian)(xian)(xian)外徑(jing)，這樣可減(jian)小(xiao)(xiao)導(dao)(dao)線(xian)(xian)(xian)(xian)表(biao)面(mian)的(de)電(dian)場強(qiang)(qiang)度(du)和電(dian)暈放電(dian)，降低(di)噪聲，減(jian)少對無線(xian)(xian)(xian)(xian)電(dian)的(de)干擾。相(xiang) 對于常規導(dao)(dao)線(xian)(xian)(xian)(xian)，擴徑(jing)導(dao)(dao)線(xian)(xian)(xian)(xian)重量(liang)較輕，安裝敷設(she)后(hou)的(de) 塑蠕伸長減(jian)小(xiao)(xiao)，導(dao)(dao)線(xian)(xian)(xian)(xian)永(yong)久(jiu)變形減(jian)少，在滿足輸送容 量(liang)要(yao)(yao)求和環境保護指標的(de)前提(ti)下，可大(da)幅降低(di)線(xian)(xian)(xian)(xian)路 整(zheng)體造價。簡單說來，擴徑(jing)導(dao)(dao)線(xian)(xian)(xian)(xian)是從常規導(dao)(dao)線(xian)(xian)(xian)(xian)中抽取數(shu)股 鋁線(xian)(xian)(xian)(xian)后(hou)繞(rao)制(zhi)而成的(de)，是常規導(dao)(dao)線(xian)(xian)(xian)(xian)時升(sheng)級進化(hua)品。

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