1.擴徑導線(xian)就是(shi)把(ba)普通的(de)(de)導線(xian)做(zuo)成(cheng)(cheng)中空的(de)(de)，這樣里面用(yong)多股(gu)鋼芯線(xian)和(he)支(zhi)撐層(ceng)做(zuo)成(cheng)(cheng)。目的(de)(de)就是(shi)為了增加(jia)導線(xian)的(de)(de)等(deng)效半(ban)徑。

2.鋁鋼擴徑空(kong)心(xin)導線是以(yi)金屬軟(ruan)管(guan)(guan)作支撐的。這(zhe)種(zhong)導線采用耐張(zhang)接續(xu)(xu)時，鋼錨應(ying)插入空(kong)心(xin)金屬軟(ruan)管(guan)(guan)中進行壓縮(suo)，這(zhe)樣可(ke)以(yi)避(bi)免軟(ruan)管(guan)(guan)受壓變形影響(xiang)接續(xu)(xu)質量。

3.當線(xian)(xian)(xian)路的(de)電(dian)(dian)(dian)壓超過220kv時，為了降低線(xian)(xian)(xian)路電(dian)(dian)(dian)抗和電(dian)(dian)(dian)暈(yun)損耗(hao)，通(tong)常采用(yong)擴徑導線(xian)(xian)(xian)或分(fen)(fen)裂(lie)導線(xian)(xian)(xian)。分(fen)(fen)裂(lie)導線(xian)(xian)(xian)是將每相(xiang)導線(xian)(xian)(xian)分(fen)(fen)為若(ruo)干根子導線(xian)(xian)(xian)，每根之間保(bao)持一(yi)定距離（一(yi)般為400mm）這樣可以使導線(xian)(xian)(xian)的(de)等效(xiao)半徑增大，從而檢點線(xian)(xian)(xian)路的(de)電(dian)(dian)(dian)抗和電(dian)(dian)(dian)暈(yun)損耗(hao)。

4.擴徑導線適(shi)(shi)用范圍:適(shi)(shi)用于超(chao)高(gao)(gao)(gao)壓(ya)和(he)特高(gao)(gao)(gao)壓(ya)輸電(dian)工程，尤其是在高(gao)(gao)(gao)海(hai)拔地區有著更為廣(guang)泛的(de)前景。