擴徑(jing)導線(xian)(xian)(xian)是以滿(man)足技術條(tiao)件(jian)的(de)(de)常規(gui)(gui)導線(xian)(xian)(xian)規(gui)(gui)格為(wei)基準，采取擴大導線(xian)(xian)(xian)外徑(jing)技術，在保證電暈所要求(qiu)的(de)(de)導線(xian)(xian)(xian)外徑(jing)前提下，減(jian)少(shao)導線(xian)(xian)(xian)的(de)(de)鋁截(jie)面，從(cong)而減(jian)少(shao)導線(xian)(xian)(xian)的(de)(de)總重(zhong)量(liang)，減(jian)少(shao)鐵(tie)塔荷載(zai)和結(jie)構重(zhong)量(liang)，極(ji)大地降低線(xian)(xian)(xian)路(lu)造價(jia)。

當線(xian)(xian)路的(de)電(dian)壓超過220kv時，為了降低線(xian)(xian)路電(dian)抗和(he)電(dian)暈(yun)損(sun)耗，通常采用擴徑導線(xian)(xian)。擴徑導線(xian)(xian)就是(shi)把普通的(de)導線(xian)(xian)做成中(zhong)空（里面用多(duo)股(gu)鋼(gang)芯線(xian)(xian)和(he)支撐層(ceng)做成）或者減少(shao)其中(zhong)部分層(ceng)單線(xian)(xian)數量（使(shi)該層(ceng)單線(xian)(xian)間存(cun)在一定數量空隙），最終達(da)到增(zeng)加導線(xian)(xian)的(de)等效半徑的(de)目的(de)。

擴徑導線(xian)在超(chao)高(gao)壓(ya)(ya)和(he)特高(gao)壓(ya)(ya)輸電(dian)(dian)工程中有很大的(de)應用空間，尤(you)其在高(gao)海(hai)拔地區有著更為廣闊(kuo)的(de)前景。擴徑鋼(gang)芯鋁絞線(xian)LGKK適用于高(gao)低壓(ya)(ya)輸電(dian)(dian)線(xian)中電(dian)(dian)廠及(ji)變電(dian)(dian)站配電(dian)(dian)線(xian)路。