擴徑(jing)導線(xian)(xian)是以滿(man)足技術條(tiao)件(jian)的(de)常(chang)規(gui)導線(xian)(xian)規(gui)格為基準，采取擴大導線(xian)(xian)外徑(jing)技術，在保證電暈所要求的(de)導線(xian)(xian)外徑(jing)前(qian)提下，減少(shao)導線(xian)(xian)的(de)鋁截面，從而減少(shao)導線(xian)(xian)的(de)總重(zhong)量，減少(shao)鐵塔荷(he)載和結構重(zhong)量，極大地降(jiang)低線(xian)(xian)路造價(jia)。

當線路的(de)電(dian)(dian)壓超過220kv時，為了降低線路電(dian)(dian)抗和電(dian)(dian)暈損耗，通常采用(yong)擴(kuo)徑(jing)導(dao)線。擴(kuo)徑(jing)導(dao)線就是把普通的(de)導(dao)線做(zuo)成中空（里面用(yong)多(duo)股(gu)芯線和支撐層做(zuo)成）或者減少其中部分層單線數量(liang)（使(shi)該層單線間存在一定數量(liang)空隙），最終(zhong)達到增加導(dao)線的(de)等效(xiao)半徑(jing)的(de)目(mu)的(de)。

交流輸電(dian)(dian)線(xian)(xian)路的(de)(de)電(dian)(dian)暈損失主(zhu)要(yao)(yao)(yao)與導(dao)線(xian)(xian)表(biao)面(mian)(mian)場(chang)強和(he)(he)天氣(qi)有關，根據絕緣水平要(yao)(yao)(yao)求確定了相間(jian)距(ju)離后(hou)，導(dao)線(xian)(xian)表(biao)面(mian)(mian)場(chang)強主(zhu)要(yao)(yao)(yao)與導(dao)線(xian)(xian)分裂數、分裂間(jian)距(ju)和(he)(he) 子導(dao)線(xian)(xian)直徑(jing)有關，分裂數越(yue)(yue)多，子導(dao)線(xian)(xian)直徑(jing)越(yue)(yue)大(da)， 表(biao)面(mian)(mian)場(chang)強越(yue)(yue)小。擴(kuo)徑(jing)導(dao)線(xian)(xian)通過(guo)支撐鋁(lv)線(xian)(xian)疏繞的(de)(de)方式 擴(kuo)大(da)了導(dao)線(xian)(xian)外(wai)徑(jing)，這樣可減(jian)小導(dao)線(xian)(xian)表(biao)面(mian)(mian)的(de)(de)電(dian)(dian)場(chang)強度(du)和(he)(he)電(dian)(dian)暈放電(dian)(dian)，降(jiang)(jiang)低(di)噪聲，減(jian)少對(dui)無線(xian)(xian)電(dian)(dian)的(de)(de)干擾。相 對(dui)于(yu)常(chang)規導(dao)線(xian)(xian)，擴(kuo)徑(jing)導(dao)線(xian)(xian)重(zhong)量(liang)較輕(qing)，安裝敷設(she)后(hou)的(de)(de) 塑蠕伸長減(jian)小，導(dao)線(xian)(xian)永久(jiu)變形減(jian)少，在滿足輸送容 量(liang)要(yao)(yao)(yao)求和(he)(he)環境(jing)保護指標的(de)(de)前提(ti)下，可大(da)幅降(jiang)(jiang)低(di)線(xian)(xian)路 整體造價。簡單說來，擴(kuo)徑(jing)導(dao)線(xian)(xian)是從(cong)常(chang)規導(dao)線(xian)(xian)中抽取數股 鋁(lv)線(xian)(xian)后(hou)繞制而成的(de)(de)，是常(chang)規導(dao)線(xian)(xian)時升級進化品。

各(ge)種耐(nai)熱(re)鋁(lv)(lv)合金(jin)(jin)母(mu)線(xian)(xian)(xian)(xian)及(ji)擴徑導(dao)(dao)線(xian)(xian)(xian)(xian)， LF21(A21)、6063(6063G)、LDRE(6R5)、6Z63(6063-Rr)系(xi)列鋁(lv)(lv)合金(jin)(jin)導(dao)(dao)電管(guan)(guan)狀母(mu)線(xian)(xian)(xian)(xian)。10KV、35KV絕緣(yuan)(yuan)銅(鋁(lv)(lv))管(guan)(guan)狀母(mu)線(xian)(xian)(xian)(xian)，封閉母(mu)線(xian)(xian)(xian)(xian)，絕緣(yuan)(yuan)母(mu)線(xian)(xian)(xian)(xian)，共相絕緣(yuan)(yuan)母(mu)線(xian)(xian)(xian)(xian)  ，母(mu)線(xian)(xian)(xian)(xian)橋(qiao)。各(ge)種工業用純鋁(lv)(lv)及(ji)合金(jin)(jin)管(guan)(guan)-排-棒。特種導(dao)(dao)線(xian)(xian)(xian)(xian)，鋼芯鋁(lv)(lv)絞線(xian)(xian)(xian)(xian)，鋁(lv)(lv)矩形母(mu)線(xian)(xian)(xian)(xian)，各(ge)種電力金(jin)(jin)具，電力托(tuo)架.