多根電(dian)纜線并排敷設(she)直埋有哪(na)些弊端(duan)

一，各種(zhong)型(xing)號規格的(de)(de)低中壓電(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)纜(lan)都有有一個理論計(ji)(ji)算載(zai)流量，但對電(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)纜(lan)的(de)(de)實(shi)際(ji)敷(fu)(fu)設(she)(she)(she)使(shi)用(yong)環(huan)境(jing)(jing)，必須(xu)要充分(fen)考(kao)慮(lv)實(shi)際(ji)使(shi)用(yong)敷(fu)(fu)設(she)(she)(she)環(huan)境(jing)(jing)的(de)(de)熱(re)阻(zu)校正系數，對電(dian)(dian)(dian)(dian)纜(lan)實(shi)際(ji)載(zai)流量進(jin)行(xing)校正，這(zhe)在電(dian)(dian)(dian)(dian)纜(lan)選用(yong)施工(gong)前的(de)(de)設(she)(she)(she)計(ji)(ji)階(jie)段必須(xu)得充分(fen)進(jin)行(xing)考(kao)慮(lv)，否(fou)則(ze)一旦電(dian)(dian)(dian)(dian)纜(lan)施工(gong)完成，將(jiang)(jiang)無(wu)法進(jin)行(xing)補救，造成的(de)(de)電(dian)(dian)(dian)(dian)力經(jing)(jing)濟(ji)損失(shi)巨(ju)大(da)。多根電(dian)(dian)(dian)(dian)纜(lan)穿入PVC塑料管(guan)，無(wu)間隙(xi)隨意碼放直(zhi)(zhi)埋(mai)敷(fu)(fu)設(she)(she)(she)，每(mei)根電(dian)(dian)(dian)(dian)纜(lan)的(de)(de)環(huan)境(jing)(jing)熱(re)阻(zu)系數較電(dian)(dian)(dian)(dian)纜(lan)直(zhi)(zhi)接(jie)埋(mai)地(di)敷(fu)(fu)設(she)(she)(she)方式大(da)大(da)增加(jia)。在電(dian)(dian)(dian)(dian)纜(lan)的(de)(de)實(shi)際(ji)通(tong)電(dian)(dian)(dian)(dian)運(yun)(yun)行(xing)過程(cheng)中，位于(yu)排(pai)管(guan)內部每(mei)根電(dian)(dian)(dian)(dian)纜(lan)周圍的(de)(de)介(jie)質主(zhu)要為塑料管(guan)和(he)相鄰電(dian)(dian)(dian)(dian)纜(lan)，而(er)不(bu)是純粹的(de)(de)土(tu)壤，其(qi)(qi)熱(re)阻(zu)將(jiang)(jiang)遠(yuan)遠(yuan)大(da)于(yu)土(tu)壤；同時(shi)電(dian)(dian)(dian)(dian)纜(lan)在運(yun)(yun)行(xing)中產生的(de)(de)發熱(re)量也(ye)在不(bu)斷對塑料管(guan)和(he)周圍電(dian)(dian)(dian)(dian)纜(lan)在加(jia)熱(re)，此(ci)時(shi)電(dian)(dian)(dian)(dian)纜(lan)實(shi)際(ji)敷(fu)(fu)設(she)(she)(she)環(huan)境(jing)(jing)已不(bu)是純粹的(de)(de)直(zhi)(zhi)接(jie)埋(mai)地(di)敷(fu)(fu)設(she)(she)(she)，其(qi)(qi)實(shi)際(ji)運(yun)(yun)行(xing)允許載(zai)流量將(jiang)(jiang)大(da)大(da)下降，電(dian)(dian)(dian)(dian)纜(lan)熱(re)擊(ji)穿事(shi)故的(de)(de)發生勢在必然。因(yin)此(ci)對于(yu)電(dian)(dian)(dian)(dian)纜(lan)敷(fu)(fu)設(she)(she)(she)工(gong)程(cheng)的(de)(de)初期設(she)(she)(she)計(ji)(ji)必須(xu)要將(jiang)(jiang)電(dian)(dian)(dian)(dian)纜(lan)敷(fu)(fu)設(she)(she)(she)后的(de)(de)實(shi)際(ji)熱(re)阻(zu)充分(fen)考(kao)慮(lv)在內，及(ji)時(shi)進(jin)行(xing)校正設(she)(she)(she)計(ji)(ji)，否(fou)則(ze)造成的(de)(de)經(jing)(jing)濟(ji)損失(shi)巨(ju)大(da)。

二，多根(gen)(gen)電(dian)(dian)(dian)纜(lan)并(bing)排無(wu)間隙隨意碼放堆積(ji)敷設直埋(mai)后，當其中的(de)一根(gen)(gen)電(dian)(dian)(dian)纜(lan)發(fa)生故障時(shi)可(ke)能(neng)會(hui)將相鄰的(de)一根(gen)(gen)或多根(gen)(gen)電(dian)(dian)(dian)纜(lan)連(lian)帶燒毀，造(zao)成事故的(de)蔓延(yan)和(he)擴大。同(tong)(tong)時(shi)還會(hui)引發(fa)熱擊穿(chuan)事故的(de)發(fa)生。電(dian)(dian)(dian)纜(lan)直埋(mai)根(gen)(gen)數太多對于電(dian)(dian)(dian)纜(lan)線路(lu)故障的(de)實際維修開(kai)挖不利，因為電(dian)(dian)(dian)纜(lan)數量多，開(kai)挖過程造(zao)成電(dian)(dian)(dian)纜(lan)機(ji)械損傷的(de)機(ji)會(hui)也將大大增加，同(tong)(tong)時(shi)在開(kai)挖故障電(dian)(dian)(dian)纜(lan)時(shi)，相鄰電(dian)(dian)(dian)纜(lan)可(ke)能(neng)都處于通電(dian)(dian)(dian)狀態，人員(yuan)觸(chu)電(dian)(dian)(dian)事故和(he)二次事故引發(fa)的(de)停電(dian)(dian)(dian)范圍很可(ke)能(neng)會(hui)擴大。因此對于(yu)多(duo)根電(dian)纜同(tong)時直埋，根數(shu)最好能控制在6根以下，敷設過程中盡(jin)量(liang)拉開距離，給(gei)電(dian)纜足夠的散(san)熱空間，在電(dian)纜選擇時，要對其(qi)周(zhou)圍土壤或沙土的散(san)熱性能充(chong)分(fen)加以考慮，進(jin)行熱阻系(xi)數(shu)的校正，才能確(que)保電(dian)纜正常安全使用(yong)，使其(qi)使用(yong)壽命得以充(chong)分(fen)發揮(hui)。