塑料(liao)(liao)電(dian)(dian)線(xian)電(dian)(dian)纜的(de)(de)(de)主要絕(jue)(jue)(jue)緣(yuan)材(cai)料(liao)(liao)和(he)護(hu)層(ceng)材(cai)料(liao)(liao)是(shi)塑料(liao)(liao)。熱(re)塑性(xing)(xing)塑料(liao)(liao)性(xing)(xing)能(neng)優越，具(ju)有(you)良好的(de)(de)(de)加工工藝(yi)性(xing)(xing)能(neng)，尤其是(shi)用于電(dian)(dian)線(xian)電(dian)(dian)纜擠(ji)制(zhi)絕(jue)(jue)(jue)緣(yuan)層(ceng)和(he)護(hu)層(ceng)生(sheng)產(chan)(chan)時工藝(yi)簡(jian)便。電(dian)(dian)線(xian)電(dian)(dian)纜塑料(liao)(liao)絕(jue)(jue)(jue)緣(yuan)層(ceng)和(he)護(hu)層(ceng)生(sheng)產(chan)(chan)的(de)(de)(de)基本方(fang)式是(shi)采用單螺桿擠(ji)出機(ji)(ji)連(lian)續(xu)擠(ji)壓(ya)進(jin)(jin)行(xing)的(de)(de)(de)。由于擠(ji)出機(ji)(ji)具(ju)有(you)連(lian)續(xu)擠(ji)出的(de)(de)(de)特點，所以塑料(liao)(liao)絕(jue)(jue)(jue)緣(yuan)和(he)護(hu)套的(de)(de)(de)生(sheng)產(chan)(chan)過程也是(shi)連(lian)續(xu)進(jin)(jin)行(xing)的(de)(de)(de)。就電(dian)(dian)線(xian)電(dian)(dian)纜生(sheng)產(chan)(chan)而言，產(chan)(chan)品(pin)規格(ge)的(de)(de)(de)差異，擠(ji)制(zhi)部件的(de)(de)(de)不(bu)同，往(wang)往(wang)決定了擠(ji)制(zhi)設備(bei)及工藝(yi)參數的(de)(de)(de)某些(xie)變化(hua)。

由于電(dian)(dian)(dian)力電(dian)(dian)(dian)纜(lan)(lan)外徑(jing)較(jiao)大(da),運(yun)輸、敷(fu)設較(jiao)為困難,電(dian)(dian)(dian)力電(dian)(dian)(dian)纜(lan)(lan)對轉(zhuan)彎(wan)(wan)半徑(jing)的(de)要求也比(bi)較(jiao)嚴(yan)格(ge)。電(dian)(dian)(dian)力電(dian)(dian)(dian)纜(lan)(lan)在(zai)施工中(zhong),如果轉(zhuan)彎(wan)(wan)角度(du)過大(da),可(ke)能使導體內(nei)部受(shou)到機械(xie)損(sun)(sun)(sun)傷(shang),而機械(xie)損(sun)(sun)(sun)傷(shang)因被(bei)電(dian)(dian)(dian)纜(lan)(lan)絕緣強(qiang)度(du)下降,直(zhi)到出(chu)現(xian)故(gu)障(zhang)。由此可(ke)見,電(dian)(dian)(dian)纜(lan)(lan)施工過程(cheng)中(zhong),要盡可(ke)能減少(shao)電(dian)(dian)(dian)纜(lan)(lan)受(shou)到的(de)扭力,在(zai)電(dian)(dian)(dian)纜(lan)(lan)轉(zhuan)彎(wan)(wan)和余留電(dian)(dian)(dian)纜(lan)(lan)時(shi),讓電(dian)(dian)(dian)纜(lan)(lan)處于自然彎(wan)(wan)曲(qu),避免(mian)內(nei)部機械(xie)損(sun)(sun)(sun)傷(shang)現(xian)象(xiang)的(de)發生。

運行經驗(yan)表明,中(zhong)、低(di)壓電(dian)(dian)力(li)電(dian)(dian)纜(lan)故(gu)障(zhang)大部(bu)分為電(dian)(dian)纜(lan)中(zhong)間接頭(tou)(tou)和終(zhong)端(duan)(duan)頭(tou)(tou)故(gu)障(zhang),而中(zhong)間接頭(tou)(tou)和終(zhong)端(duan)(duan)頭(tou)(tou)故(gu)障(zhang)則大部(bu)分是因(yin)(yin)密(mi)封不良(liang),潮氣侵入造成電(dian)(dian)纜(lan)銅導體氧化而導致絕(jue)緣(yuan)強度下降,而中(zhong)、低(di)壓電(dian)(dian)力(li)電(dian)(dian)纜(lan)網多(duo)采用樹枝狀(zhuang)供電(dian)(dian)方式(shi),電(dian)(dian)纜(lan)終(zhong)端(duan)(duan)頭(tou)(tou)數(shu)量較多(duo),因(yin)(yin)此把好電(dian)(dian)纜(lan)終(zhong)端(duan)(duan)頭(tou)(tou)和中(zhong)間接頭(tou)(tou)堵漏(lou)密(mi)封關(guan)是保證電(dian)(dian)纜(lan)安(an)全可靠(kao)運行的重(zhong)要措(cuo)施之一(yi)。