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燒斷零(ling)線(xian)(xian)的原因。1、零(ling)線(xian)(xian)接線(xian)(xian)頭處理的不合格。2、系統中三相負載嚴重的不平(ping)衡(heng)。3、解決的辦(ban)法是(shi)重新(xin)平(ping)衡(heng)三相負載，負載相對平(ping)衡(heng)了，零(ling)線(xian)(xian)的電流就減(jian)小于了。

其實燒斷零(ling)(ling)線(xian)(xian)(xian)的(de)(de)主(zhu)(zhu)要原還(huan)是(shi)(shi)(shi)(shi)(shi)在于供電(dian)的(de)(de)方(fang)式(shi)(shi)。如果你的(de)(de)供電(dian)方(fang)式(shi)(shi)是(shi)(shi)(shi)(shi)(shi)四線(xian)(xian)(xian)380伏使用(yong)(yong)，相(xiang)線(xian)(xian)(xian)與零(ling)(ling)線(xian)(xian)(xian)線(xian)(xian)(xian)徑應該(gai)一樣(yang)(yang)大或者可以(yi)(yi)小(xiao)一點，因(yin)為此方(fang)式(shi)(shi)是(shi)(shi)(shi)(shi)(shi)以(yi)(yi)380伏用(yong)(yong)電(dian)器(qi)為主(zhu)(zhu)，三相(xiang)電(dian)流(liu)比(bi)較(jiao)平衡。如果供電(dian)方(fang)式(shi)(shi)是(shi)(shi)(shi)(shi)(shi)三相(xiang)220伏四線(xian)(xian)(xian)供電(dian)方(fang)式(shi)(shi)，那(nei)它的(de)(de)零(ling)(ling)線(xian)(xian)(xian)總線(xian)(xian)(xian)應比(bi)相(xiang)線(xian)(xian)(xian)大，因(yin)為相(xiang)線(xian)(xian)(xian)與零(ling)(ling)線(xian)(xian)(xian)所流(liu)過的(de)(de)電(dian)流(liu)是(shi)(shi)(shi)(shi)(shi)同樣(yang)(yang)的(de)(de)，而且三相(xiang)電(dian)流(liu)是(shi)(shi)(shi)(shi)(shi)不平衡的(de)(de)，所以(yi)(yi)總零(ling)(ling)線(xian)(xian)(xian)的(de)(de)載流(liu)量應是(shi)(shi)(shi)(shi)(shi)三相(xiang)220伏用(yong)(yong)電(dian)流(liu)量的(de)(de)總和。

三相四線(xian)(xian)制供電(dian)(dian)電(dian)(dian)路，零線(xian)(xian)應不(bu)小于***大不(bu)平衡負荷電(dian)(dian)流(liu)的(de)方式(shi)來選擇截面(mian)積，單相供電(dian)(dian)則(ze)選用與相線(xian)(xian)一樣的(de)截面(mian)積！

一般(ban)燒(shao)毀的應當是(shi)火(huo)線，不應當是(shi)零線，如果老是(shi)零線燒(shao)毀，就應當查查線路和負載。火(huo)線燒(shao)毀是(shi)正常，零線老燒(shao)毀就得引起注意。

三(san)(san)(san)相四線(xian)(xian)供(gong)配電的(de)零(ling)線(xian)(xian)經常燒斷(duan)(duan)，實際(ji)上(shang)現(xian)在的(de)三(san)(san)(san)相四線(xian)(xian)供(gong)配電線(xian)(xian)路上(shang)的(de)零(ling)線(xian)(xian)都在沿供(gong)配電線(xian)(xian)路的(de)干線(xian)(xian)及(ji)支線(xian)(xian)都有密集的(de)重復接地的(de)（因為電力法規(gui)(gui)定：用戶(hu)計量裝置前的(de)產權屬供(gong)電方所有，因此而(er)造成(cheng)用戶(hu)的(de)損失也得由供(gong)電方負責(ze)。）。而(er)且更不(bu)是(shi)文章所說的(de)三(san)(san)(san)相四的(de)線(xian)(xian)零(ling)線(xian)(xian)上(shang)的(de)熔(rong)斷(duan)(duan)器熔(rong)斷(duan)(duan)或開(kai)(kai)(kai)關斷(duan)(duan)開(kai)(kai)(kai)所致的(de)零(ling)線(xian)(xian)斷(duan)(duan)路，因為“安全規(gui)(gui)程”規(gui)(gui)定三(san)(san)(san)相四線(xian)(xian)中的(de)零(ling)線(xian)(xian)是(shi)不(bu)得裝設熔(rong)斷(duan)(duan)器及(ji)開(kai)(kai)(kai)關的(de)。

在單相(xiang)(xiang)(xiang)供(gong)電(dian)(dian)(dian)線路，零(ling)(ling)線和相(xiang)(xiang)(xiang)線電(dian)(dian)(dian)流(liu)是(shi)相(xiang)(xiang)(xiang)等的(de)(de)(de)，所以(yi)零(ling)(ling)線和相(xiang)(xiang)(xiang)線線徑(jing)必(bi)須一樣大。在三相(xiang)(xiang)(xiang)四線供(gong)電(dian)(dian)(dian)線路中(zhong)，零(ling)(ling)線是(shi)用來平衡(heng)三相(xiang)(xiang)(xiang)不平橫(heng)電(dian)(dian)(dian)流(liu)的(de)(de)(de)，在三相(xiang)(xiang)(xiang)***不平衡(heng)的(de)(de)(de)情況下(xia)，零(ling)(ling)線也只(zhi)有1/3相(xiang)(xiang)(xiang)線的(de)(de)(de)電(dian)(dian)(dian)流(liu)量（三相(xiang)(xiang)(xiang)有二相(xiang)(xiang)(xiang)斷路的(de)(de)(de)情況下(xia)除外），所以(yi)為了(le)節省線路成(cheng)本，以(yi)前(qian)的(de)(de)(de)1KV低壓電(dian)(dian)(dian)纜零(ling)(ling)線的(de)(de)(de)線徑(jing)只(zhi)有相(xiang)(xiang)(xiang)線線徑(jing)的(de)(de)(de)1/3左右，現在加(jia)大零(ling)(ling)線基本上都是(shi)1/2。進口電(dian)(dian)(dian)纜大體都是(shi)四線線徑(jing)一樣。