電(dian)(dian)(dian)(dian)纜(lan)(lan)加上交流(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)(ya)，就有電(dian)(dian)(dian)(dian)流(liu)(liu)流(liu)(liu)過，當電(dian)(dian)(dian)(dian)壓(ya)(ya)的(de)幅值和頻(pin)率一定時，電(dian)(dian)(dian)(dian)容電(dian)(dian)(dian)(dian)流(liu)(liu)的(de)大小是(shi)(shi)正比(bi)于(yu)電(dian)(dian)(dian)(dian)纜(lan)(lan)的(de)電(dian)(dian)(dian)(dian)容(Cx)。對于(yu)超高壓(ya)(ya)電(dian)(dian)(dian)(dian)纜(lan)(lan)，這種(zhong)電(dian)(dian)(dian)(dian)容的(de)電(dian)(dian)(dian)(dian)流(liu)(liu)可能達到與額定電(dian)(dian)(dian)(dian)流(liu)(liu)可以(yi)相比(bi)的(de)數(shu)值，成(cheng)為限制電(dian)(dian)(dian)(dian)纜(lan)(lan)容量和傳(chuan)輸距(ju)離(li)的(de)重要因(yin)素。因(yin)此(ci)電(dian)(dian)(dian)(dian)纜(lan)(lan)的(de)電(dian)(dian)(dian)(dian)容也是(shi)(shi)電(dian)(dian)(dian)(dian)纜(lan)(lan)的(de)主要的(de)電(dian)(dian)(dian)(dian)性能參數(shu)之(zhi)一。在(zai)(zai)交流(liu)(liu)電(dian)(dian)(dian)(dian)場中，電(dian)(dian)(dian)(dian)纜(lan)(lan)中的(de)絕緣體由于(yu)泄露電(dian)(dian)(dian)(dian)流(liu)(liu)和各種(zhong)極化(hua)存(cun)在(zai)(zai)，電(dian)(dian)(dian)(dian)纜(lan)(lan)橋架(jia)價格，會形(xing)成(cheng)介(jie)(jie)質(zhi)損耗，以(yi)介(jie)(jie)質(zhi)損耗因(yin)數(shu)或損耗角(jiao)正切(qie)值(TAN)來表示，它不但浪費電(dian)(dian)(dian)(dian)能，而且會使介(jie)(jie)質(zhi)(絕緣體)發熱，加速絕緣老化(hua)，因(yin)此(ci)TAN也是(shi)(shi)電(dian)(dian)(dian)(dian)纜(lan)(lan)主要參數(shu)之(zhi)一。

我們知道現在(zai)生活離(li)不(bu)開電(dian)(dian)當然就離(li)不(bu)開電(dian)(dian)線(xian)電(dian)(dian)纜(lan)(lan)，由(you)于使用場(chang)合的(de)不(bu)同(tong)(tong)對于電(dian)(dian)線(xian)電(dian)(dian)纜(lan)(lan)的(de)選用也是有區別的(de)，高壓電(dian)(dian)纜(lan)(lan)，變頻電(dian)(dian)纜(lan)(lan)，阻燃(ran)電(dian)(dian)纜(lan)(lan)等(deng)等(deng)，這(zhe)些不(bu)同(tong)(tong)特性的(de)電(dian)(dian)纜(lan)(lan)應(ying)用場(chang)所(suo)有所(suo)不(bu)同(tong)(tong)。電(dian)(dian)線(xian)電(dian)(dian)纜(lan)(lan)的(de)品種非(fei)常(chang)多(duo)，電(dian)(dian)線(xian)電(dian)(dian)纜(lan)(lan)制造(zao)廠(chang)家，性能要(yao)求特別高，如導體用銅(tong)，要(yao)求銅(tong)的(de)純度要(yao)在(zai)99。95%以上，有的(de)產品要(yao)采用無氧高純銅(tong)。我們對于電(dian)(dian)線(xian)電(dian)(dian)纜(lan)(lan)的(de)挑選非(fei)常(chang)的(de)嚴(yan)謹，因(yin)為(wei)如果稍微(wei)不(bu)慎可能會造(zao)成(cheng)安全(quan)事(shi)故。所(suo)以一旦電(dian)(dian)線(xian)電(dian)(dian)纜(lan)(lan)出現什么異常(chang)，一定(ding)要(yao)及時的(de)找出原因(yin)并解決。

在(zai)電(dian)纜(lan)(lan)的(de)現(xian)場敷設過(guo)程中電(dian)纜(lan)(lan)護套表面(mian)刮傷破損(sun)的(de)現(xian)象是普遍存在(zai)的(de)，電(dian)力電(dian)纜(lan)(lan)廠(chang)，損(sun)傷輕微的(de)只傷及了護套，安徽電(dian)纜(lan)(lan)，如何修(xiu)(xiu)補(bu)能保證(zheng)質(zhi)量，而且(qie)修(xiu)(xiu)補(bu)時(shi)間(jian)短，又能保證(zheng)質(zhi)量日益(yi)成為(wei)電(dian)纜(lan)(lan)消費者(zhe)普遍關(guan)心(xin)(xin)的(de)問題。而且(qie)投入(ru)小(xiao)，在(zai)現(xian)場的(de)惡劣條件下又容易實現(xian)，因此現(xian)場護套的(de)修(xiu)(xiu)補(bu)技術及質(zhi)量日益(yi)成為(wei)用戶關(guan)心(xin)(xin)的(de)問題。為(wei)便于(yu)電(dian)纜(lan)(lan)現(xian)場修(xiu)(xiu)補(bu)工(gong)作的(de)順利進行，施工(gong)單位要配備(bei)有(you)野(ye)外小(xiao)型發電(dian)機。同時(shi)處于(yu)現(xian)場修(xiu)(xiu)補(bu)的(de)方(fang)便現(xian)在(zai)提(ti)供的(de)塑料焊(han)的(de)質(zhi)量要過(guo)硬。