電(dian)(dian)力(li)(li)電(dian)(dian)纜是(shi)電(dian)(dian)力(li)(li)系統主(zhu)(zhu)網的(de)主(zhu)(zhu)要(yao)元件。一般敷設(she)在地下的(de)廊道內,其作用是(shi)傳(chuan)輸和分(fen)(fen)配電(dian)(dian)能。電(dian)(dian)力(li)(li)電(dian)(dian)纜主(zhu)(zhu)要(yao)用于城區、國(guo)防(fang)工(gong)程和電(dian)(dian)站等必(bi)須采用地下輸電(dian)(dian)的(de)部(bu)位。電(dian)(dian)力(li)(li)電(dian)(dian)纜主(zhu)(zhu)要(yao)由三(san)大部(bu)分(fen)(fen)組(zu)成：①導(dao)體(ti):傳(chuan)輸電(dian)(dian)流(liu),指導(dao)功(gong)率傳(chuan)輸方式;②絕(jue)(jue)緣層:承受電(dian)(dian)壓，起絕(jue)(jue)緣作用;③保(bao)(bao)護覆蓋(gai)層:保(bao)(bao)護電(dian)(dian)纜絕(jue)(jue)緣不受外(wai)界環境的(de)影響(xiang)和防(fang)止機械損傷等。

我國解放初期僅(jin)能生產低壓油浸紙絕緣(yuan)電(dian)(dian)力電(dian)(dian)纜(lan)(lan)(lan)。隨(sui)著工業的發展和(he)科技進步,目(mu)前我國生產的電(dian)(dian)力電(dian)(dian)纜(lan)(lan)(lan)主要采用交(jiao)聯(lian)聚(ju)乙烯絕緣(yuan)電(dian)(dian)力電(dian)(dian)纜(lan)(lan)(lan)。油紙絕緣(yuan)和(he)交(jiao)聯(lian)聚(ju)乙烯絕緣(yuan)電(dian)(dian)力電(dian)(dian)纜(lan)(lan)(lan)均達到了500kV電(dian)(dian)壓等級。