擴徑(jing)導線(xian)是以(yi)滿足技術(shu)條件的常規(gui)導線(xian)規(gui)格為基準，采取(qu)擴大(da)導線(xian)外徑(jing)技術(shu)，在保證電暈所要求的導線(xian)外徑(jing)前(qian)提下，減少導線(xian)的鋁(lv)截(jie)面，從而減少導線(xian)的總重量(liang)(liang)，減少鐵塔荷載和結構重量(liang)(liang)，極大(da)地降低線(xian)路造價(jia)。

當線(xian)(xian)(xian)路(lu)(lu)的電(dian)(dian)(dian)壓超過220kv時(shi)，為了降低線(xian)(xian)(xian)路(lu)(lu)電(dian)(dian)(dian)抗和電(dian)(dian)(dian)暈(yun)損耗，通(tong)(tong)常采用擴徑導線(xian)(xian)(xian)。擴徑導線(xian)(xian)(xian)就是把普通(tong)(tong)的導線(xian)(xian)(xian)做成(cheng)中空（里(li)面用多股芯線(xian)(xian)(xian)和支撐(cheng)層(ceng)(ceng)做成(cheng)）或者減少其中部分層(ceng)(ceng)單線(xian)(xian)(xian)數量(liang)（使(shi)該層(ceng)(ceng)單線(xian)(xian)(xian)間存在一定數量(liang)空隙），最(zui)終(zhong)達到(dao)增加導線(xian)(xian)(xian)的等效半徑的目的。

交流輸電(dian)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)路(lu)的電(dian)暈(yun)(yun)損(sun)失主要與導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)表面(mian)場(chang)強和(he)天氣有關，根據(ju)絕緣水(shui)平要求確(que)定了(le)相(xiang)間(jian)距(ju)(ju)離(li)后，導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)表面(mian)場(chang)強主要與導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)分(fen)裂數、分(fen)裂間(jian)距(ju)(ju)和(he) 子(zi)導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)直徑有關，分(fen)裂數越(yue)多(duo)，子(zi)導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)直徑越(yue)大， 表面(mian)場(chang)強越(yue)小。擴徑導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)通(tong)過支撐鋁(lv)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)疏繞的方式 擴大了(le)導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)外徑，這樣可減小導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)表面(mian)的電(dian)場(chang)強度和(he)電(dian)暈(yun)(yun)放電(dian)，降(jiang)低噪聲，減少對(dui)無線(xian)(xian)(xian)(xian)(xian)(xian)(xian)電(dian)的干擾。相(xiang) 對(dui)于常規(gui)導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)，擴徑導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)重量較輕(qing)，安裝敷(fu)設(she)后的 塑(su)蠕伸長減小，導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)永久(jiu)變形(xing)減少，在滿足輸送容 量要求和(he)環(huan)境保(bao)護指標的前提下，可大幅降(jiang)低線(xian)(xian)(xian)(xian)(xian)(xian)(xian)路(lu) 整體造價。簡單說來，擴徑導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)是(shi)從(cong)常規(gui)導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)中抽(chou)取數股 鋁(lv)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)后繞制而成的，是(shi)常規(gui)導(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)時(shi)升級進化品(pin)。

本實(shi)用(yong)新型涉(she)及一種不(bu)(bu)銹鋼(gang)密(mi)波管(guan)(guan)(guan)支撐高強(qiang)度鋁合(he)金補(bu)強(qiang)空心擴徑導線(xian)，屬于電力運輸技術領域。提出的不(bu)(bu)銹鋼(gang)密(mi)波管(guan)(guan)(guan)支撐高強(qiang)度鋁合(he)金補(bu)強(qiang)空心擴徑導線(xian)，其(qi)中(zhong)心為不(bu)(bu)銹鋼(gang)密(mi)波波紋(wen)管(guan)(guan)(guan)：

（1），在不(bu)銹鋼密波波紋(wen)管

（1）的外(wai)表面(mian)由內向(xiang)外(wai)為高強度鋁(lv)合(he)金單線絞合(he)層

（2）、鋁單線(xian)絞合層(ceng)

（3）；所(suo)述高強度鋁合(he)金(jin)單線絞合(he)層(ceng)

（2）為一層(ceng)(ceng)或(huo)兩層(ceng)(ceng)；所述鋁單線(xian)絞合層(ceng)(ceng)

（3）至少為(wei)一層，最多具有三(san)層。

本實用新型(xing)使得架空(kong)擴徑導(dao)線(xian)的(de)綜合性能相比傳統空(kong)心擴徑導(dao)線(xian)有了(le)顯著提高(gao)：結構穩定，耐腐(fu)蝕性強，導(dao)線(xian)使用壽命延長(chang)，制造(zao)和(he)施工(gong)工(gong)藝復雜程度降(jiang)(jiang)低，效率(lv)提高(gao)，抗拉(la)強度和(he)載流量小幅提高(gao)的(de)同時導(dao)線(xian)整體重量降(jiang)(jiang)低，拉(la)重比更(geng)優。