擴徑導(dao)線(xian)是以(yi)滿足技(ji)(ji)術條(tiao)件(jian)的(de)常規導(dao)線(xian)規格為基準，采取擴大(da)(da)導(dao)線(xian)外徑技(ji)(ji)術，在保證電暈所要(yao)求的(de)導(dao)線(xian)外徑前提(ti)下，減(jian)(jian)少(shao)(shao)導(dao)線(xian)的(de)鋁(lv)截面(mian)，從而(er)減(jian)(jian)少(shao)(shao)導(dao)線(xian)的(de)總重(zhong)量，減(jian)(jian)少(shao)(shao)鐵塔荷載和結構重(zhong)量，極大(da)(da)地降低線(xian)路造價(jia)。

當線(xian)路的電(dian)壓超過220kv時，為了降低線(xian)路電(dian)抗和(he)(he)電(dian)暈損(sun)耗，通(tong)常采用擴徑導(dao)線(xian)。擴徑導(dao)線(xian)就是把普通(tong)的導(dao)線(xian)做成(cheng)中空（里(li)面用多股芯線(xian)和(he)(he)支撐層(ceng)(ceng)做成(cheng)）或者減少(shao)其中部(bu)分層(ceng)(ceng)單線(xian)數量(liang)（使該層(ceng)(ceng)單線(xian)間存在一定數量(liang)空隙），最終(zhong)達(da)到(dao)增(zeng)加導(dao)線(xian)的等效半徑的目的。

交流輸電(dian)(dian)(dian)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)路的(de)電(dian)(dian)(dian)暈損失主要(yao)(yao)與導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)表面(mian)場(chang)強(qiang)和天氣有關，根據(ju)絕緣(yuan)水平要(yao)(yao)求確定(ding)了相間距離后，導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)表面(mian)場(chang)強(qiang)主要(yao)(yao)與導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)分裂數、分裂間距和 子(zi)(zi)導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)直(zhi)徑(jing)(jing)(jing)(jing)有關，分裂數越(yue)多(duo)，子(zi)(zi)導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)直(zhi)徑(jing)(jing)(jing)(jing)越(yue)大， 表面(mian)場(chang)強(qiang)越(yue)小(xiao)。擴徑(jing)(jing)(jing)(jing)導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)通(tong)過(guo)支撐鋁線(xian)(xian)(xian)(xian)(xian)(xian)(xian)疏繞(rao)的(de)方式 擴大了導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)外(wai)徑(jing)(jing)(jing)(jing)，這(zhe)樣(yang)可減(jian)小(xiao)導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)表面(mian)的(de)電(dian)(dian)(dian)場(chang)強(qiang)度和電(dian)(dian)(dian)暈放電(dian)(dian)(dian)，降低(di)噪(zao)聲，減(jian)少(shao)對(dui)無線(xian)(xian)(xian)(xian)(xian)(xian)(xian)電(dian)(dian)(dian)的(de)干擾。相 對(dui)于(yu)常規(gui)導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)，擴徑(jing)(jing)(jing)(jing)導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)重量較輕(qing)，安裝(zhuang)敷設后的(de) 塑蠕(ru)伸長(chang)減(jian)小(xiao)，導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)永久(jiu)變形減(jian)少(shao)，在滿足輸送容 量要(yao)(yao)求和環境保護(hu)指(zhi)標(biao)的(de)前提下，可大幅降低(di)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)路 整(zheng)體造價(jia)。簡單說來，擴徑(jing)(jing)(jing)(jing)導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)是(shi)(shi)從常規(gui)導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)中抽取數股 鋁線(xian)(xian)(xian)(xian)(xian)(xian)(xian)后繞(rao)制而成的(de)，是(shi)(shi)常規(gui)導(dao)(dao)(dao)(dao)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)時(shi)升(sheng)級進化(hua)品(pin)。

本(ben)實用新型(xing)涉(she)及一種不(bu)銹鋼密(mi)波(bo)(bo)(bo)管支撐高強度(du)鋁合金補(bu)強空(kong)心擴徑導(dao)線，屬于電力運輸技(ji)術(shu)領域。提出的(de)不(bu)銹鋼密(mi)波(bo)(bo)(bo)管支撐高強度(du)鋁合金補(bu)強空(kong)心擴徑導(dao)線，其中心為不(bu)銹鋼密(mi)波(bo)(bo)(bo)波(bo)(bo)(bo)紋管：

（1），在(zai)不銹鋼密波(bo)波(bo)紋管

（1）的外表面由內向外為高(gao)強度鋁合金單線絞(jiao)合層

（2）、鋁單線絞(jiao)合層

（3）；所(suo)述高強度(du)鋁(lv)合金(jin)單線絞合層(ceng)

（2）為一層(ceng)(ceng)或兩層(ceng)(ceng)；所(suo)述鋁(lv)單線絞合層(ceng)(ceng)

（3）至少為一層(ceng)，最多(duo)具有三層(ceng)。

本實(shi)用新(xin)型(xing)使得(de)架空(kong)擴徑導線(xian)(xian)的綜合(he)性能相(xiang)比傳統空(kong)心擴徑導線(xian)(xian)有了顯著提高(gao)(gao)：結構穩定，耐腐蝕性強，導線(xian)(xian)使用壽(shou)命延長，制(zhi)造和(he)施工(gong)工(gong)藝復雜程度降低，效率(lv)提高(gao)(gao)，抗拉強度和(he)載流量小幅提高(gao)(gao)的同時導線(xian)(xian)整體重(zhong)(zhong)量降低，拉重(zhong)(zhong)比更(geng)優。