鋼(gang)(gang)芯鋁絞絲線(xian)它內(nei)部(bu)是(shi)鋼(gang)(gang)“芯”，外部(bu)是(shi)用鋁線(xian)通(tong)過絞合方式(shi)纏繞(rao)在鋼(gang)(gang)芯周(zhou)圍(wei)；鋼(gang)(gang)芯主(zhu)要起增加強度的(de)作(zuo)(zuo)用，鋁絞線(xian)主(zhu)要起傳送(song)電能的(de)作(zuo)(zuo)用； 

鋼芯(xin)鋁絞線(xian)的(de)型(xing)號分為：JL/G1A JL/G1B JL/G2A JL/G2B JL/G3A 其中(zhong)：G1A或G1B指的(de)是普通強(qiang)度鋼線(xian)。G2A或G2B 指的(de)是高強(qiang)度鋼線(xian)。G3A指的(de)是特高強(qiang)度鋼線(xian)。

對高電(dian)壓的(de)(de)(de)(de)輸(shu)電(dian)線(xian)(xian)(xian)(xian)(xian)路，由于(yu)線(xian)(xian)(xian)(xian)(xian)路的(de)(de)(de)(de)路徑有限(xian)，又不可能在一個(ge)路徑上架(jia)(jia)多(duo)(duo)條(tiao)線(xian)(xian)(xian)(xian)(xian)路，人們想出(chu)了采(cai)用(yong)一個(ge)路徑，一套鐵塔，掛多(duo)(duo)條(tiao)導(dao)線(xian)(xian)(xian)(xian)(xian)，即(ji)一條(tiao)線(xian)(xian)(xian)(xian)(xian)路相當于(yu)架(jia)(jia)了多(duo)(duo)條(tiao)線(xian)(xian)(xian)(xian)(xian)路的(de)(de)(de)(de)方法；對500KV的(de)(de)(de)(de)輸(shu)電(dian)線(xian)(xian)(xian)(xian)(xian)路，我國大多(duo)(duo)采(cai)用(yong)掛四條(tiao)導(dao)線(xian)(xian)(xian)(xian)(xian)的(de)(de)(de)(de)方式，這(zhe)就(jiu)被(bei)命名為(wei)“四分(fen)裂(lie)線(xian)(xian)(xian)(xian)(xian)”，其實這(zhe)四分(fen)裂(lie)線(xian)(xian)(xian)(xian)(xian)就(jiu)是(shi)普(pu)通的(de)(de)(de)(de)四根鋼(gang)芯鋁絞線(xian)(xian)(xian)(xian)(xian)，沒(mei)有什(shen)么特殊的(de)(de)(de)(de)，不是(shi)一根是(shi)鋼(gang)，三根是(shi)鋁；與(yu)“裸”導(dao)線(xian)(xian)(xian)(xian)(xian)相對應，也有架(jia)(jia)空絕緣導(dao)線(xian)(xian)(xian)(xian)(xian)，型號多(duo)(duo)為(wei)JKLYJ，是(shi)架(jia)(jia)空鋁材質交聯聚氯乙烯封裝導(dao)線(xian)(xian)(xian)(xian)(xian)；在我國城市(shi)及對供(gong)電(dian)可靠性要求比較高的(de)(de)(de)(de)配(pei)電(dian)系統(tong)中已廣泛使(shi)用(yong)，雖(sui)然價格(ge)偏高，但卻是(shi)配(pei)電(dian)線(xian)(xian)(xian)(xian)(xian)路的(de)(de)(de)(de)發展方向。 

作用(yong)和(he)(he)優點(dian)：鋼芯(xin)鋁絞線具(ju)有(you)(you)結構簡單、架(jia)設與維護方便(bian)、線路(lu)造(zao)價低、傳輸(shu)容(rong)量大(da)(da)、又利于跨(kua)越江河和(he)(he)山谷等(deng)特(te)殊地(di)理條件的敷(fu)設、具(ju)有(you)(you)良好(hao)的導(dao)電(dian)性能和(he)(he)足夠的機械強度(du)、抗(kang)拉強度(du)大(da)(da)、塔(ta)桿距離可放(fang)大(da)(da)等(deng)特(te)點(dian)。因此廣泛應(ying)用(yong)于各種電(dian)壓等(deng)級的架(jia)空(kong)輸(shu)配(pei)電(dian)線路(lu)中。