擴徑(jing)(jing)導(dao)線就是把普通的導(dao)線做成中空（里(li)面用(yong)多股(gu)芯線和支(zhi)撐層做成）或(huo)者(zhe)減少其中部分層單線數(shu)(shu)量（使(shi)該層單線間存在一定數(shu)(shu)量空隙），最終達到增(zeng)加導(dao)線的等效半徑(jing)(jing)的目的。當線路(lu)的電壓(ya)超過220kv時，為了降低線路(lu)電抗和電暈損耗，通常采用(yong)擴徑(jing)(jing)導(dao)線。

擴(kuo)徑導(dao)(dao)線(xian)是以(yi)滿足技術(shu)條(tiao)件(jian)的常規導(dao)(dao)線(xian)規格(ge)為基準，采取擴(kuo)大導(dao)(dao)線(xian)外徑技術(shu)，在保證電(dian)暈所要求的導(dao)(dao)線(xian)外徑前提下，減(jian)少(shao)導(dao)(dao)線(xian)的鋁截面，從而減(jian)少(shao)導(dao)(dao)線(xian)的總重(zhong)量(liang)，減(jian)少(shao)鐵塔(ta)荷載和結(jie)構重(zhong)量(liang)，極(ji)大地(di)降低線(xian)路造(zao)價。

交流(liu)輸電線(xian)(xian)(xian)(xian)路的電暈損(sun)失主要(yao)(yao)與導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)表面(mian)場(chang)(chang) 強(qiang)和天氣有(you)關(guan)，根據絕緣(yuan)水平要(yao)(yao)求確定了相間(jian)距離 后(hou)，導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)表面(mian)場(chang)(chang)強(qiang)主要(yao)(yao)與導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)分裂數、分裂間(jian)距和 子導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)直(zhi)徑有(you)關(guan)，分裂數越多，子導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)直(zhi)徑越大， 表面(mian)場(chang)(chang)強(qiang)越小(xiao)。擴(kuo)徑導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)通過支撐鋁(lv)線(xian)(xian)(xian)(xian)疏繞的方式(shi) 擴(kuo)大了導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)外徑，這樣可(ke)減(jian)小(xiao)導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)表面(mian)的電場(chang)(chang)強(qiang)度(du)和電暈放電，降低(di)(di)噪聲，減(jian)少對(dui)無線(xian)(xian)(xian)(xian)電的干擾。相 對(dui)于常規導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)，擴(kuo)徑導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)重量(liang)(liang)較輕，安裝(zhuang)敷設(she)后(hou)的 塑蠕伸長減(jian)小(xiao)，導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)永久變形減(jian)少，在滿足輸送容(rong) 量(liang)(liang)要(yao)(yao)求和環境(jing)保護(hu)指標的前提下(xia)，可(ke)大幅降低(di)(di)線(xian)(xian)(xian)(xian)路 整體造價。簡單說(shuo)來，擴(kuo)徑導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)是從常規導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)中抽取數股 鋁(lv)線(xian)(xian)(xian)(xian)后(hou)繞制(zhi)而(er)成的，是常規導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)時升級進化品。

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