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燒斷零線的(de)原因。1、零線接線頭處理(li)的(de)不(bu)合格。2、系(xi)統中三(san)相(xiang)(xiang)負(fu)載嚴重(zhong)的(de)不(bu)平衡(heng)。3、解決的(de)辦法是(shi)重(zhong)新(xin)平衡(heng)三(san)相(xiang)(xiang)負(fu)載，負(fu)載相(xiang)(xiang)對平衡(heng)了，零線的(de)電流就減小于了。

其實燒斷(duan)零(ling)線(xian)(xian)(xian)(xian)的(de)(de)(de)主要原還(huan)是(shi)(shi)在于供(gong)電(dian)(dian)(dian)(dian)(dian)的(de)(de)(de)方(fang)(fang)式。如果你的(de)(de)(de)供(gong)電(dian)(dian)(dian)(dian)(dian)方(fang)(fang)式是(shi)(shi)四線(xian)(xian)(xian)(xian)380伏(fu)(fu)使(shi)用(yong)(yong)，相(xiang)線(xian)(xian)(xian)(xian)與零(ling)線(xian)(xian)(xian)(xian)線(xian)(xian)(xian)(xian)徑(jing)應該一樣大(da)或(huo)者(zhe)可以(yi)小一點(dian)，因為(wei)此方(fang)(fang)式是(shi)(shi)以(yi)380伏(fu)(fu)用(yong)(yong)電(dian)(dian)(dian)(dian)(dian)器(qi)為(wei)主，三(san)相(xiang)電(dian)(dian)(dian)(dian)(dian)流(liu)比較(jiao)平衡。如果供(gong)電(dian)(dian)(dian)(dian)(dian)方(fang)(fang)式是(shi)(shi)三(san)相(xiang)220伏(fu)(fu)四線(xian)(xian)(xian)(xian)供(gong)電(dian)(dian)(dian)(dian)(dian)方(fang)(fang)式，那它的(de)(de)(de)零(ling)線(xian)(xian)(xian)(xian)總線(xian)(xian)(xian)(xian)應比相(xiang)線(xian)(xian)(xian)(xian)大(da)，因為(wei)相(xiang)線(xian)(xian)(xian)(xian)與零(ling)線(xian)(xian)(xian)(xian)所流(liu)過的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)流(liu)是(shi)(shi)同樣的(de)(de)(de)，而且(qie)三(san)相(xiang)電(dian)(dian)(dian)(dian)(dian)流(liu)是(shi)(shi)不平衡的(de)(de)(de)，所以(yi)總零(ling)線(xian)(xian)(xian)(xian)的(de)(de)(de)載流(liu)量(liang)應是(shi)(shi)三(san)相(xiang)220伏(fu)(fu)用(yong)(yong)電(dian)(dian)(dian)(dian)(dian)流(liu)量(liang)的(de)(de)(de)總和(he)。

三相(xiang)四(si)線(xian)制供電電路，零線(xian)應不(bu)小(xiao)于***大(da)不(bu)平衡負荷電流的方(fang)式來選(xuan)(xuan)擇(ze)截面(mian)積，單(dan)相(xiang)供電則選(xuan)(xuan)用與相(xiang)線(xian)一樣的截面(mian)積！

一(yi)般燒(shao)毀的應(ying)當是(shi)火線(xian)，不應(ying)當是(shi)零線(xian)，如果老(lao)是(shi)零線(xian)燒(shao)毀，就(jiu)應(ying)當查(cha)查(cha)線(xian)路和(he)負載。火線(xian)燒(shao)毀是(shi)正(zheng)常，零線(xian)老(lao)燒(shao)毀就(jiu)得引起注意。

三相四(si)線(xian)供(gong)配電(dian)的(de)(de)零線(xian)經(jing)常燒斷(duan)，實際上現(xian)在的(de)(de)三相四(si)線(xian)供(gong)配電(dian)線(xian)路(lu)上的(de)(de)零線(xian)都(dou)在沿供(gong)配電(dian)線(xian)路(lu)的(de)(de)干(gan)線(xian)及支線(xian)都(dou)有(you)(you)密集的(de)(de)重復接地(di)的(de)(de)（因為電(dian)力(li)法規(gui)定：用戶(hu)計(ji)量裝置前的(de)(de)產權屬供(gong)電(dian)方所(suo)有(you)(you)，因此而(er)(er)造成(cheng)用戶(hu)的(de)(de)損失也(ye)得(de)由供(gong)電(dian)方負(fu)責(ze)。）。而(er)(er)且更(geng)不(bu)是(shi)文章所(suo)說的(de)(de)三相四(si)的(de)(de)線(xian)零線(xian)上的(de)(de)熔斷(duan)器(qi)熔斷(duan)或開關(guan)斷(duan)開所(suo)致的(de)(de)零線(xian)斷(duan)路(lu)，因為“安全規(gui)程”規(gui)定三相四(si)線(xian)中的(de)(de)零線(xian)是(shi)不(bu)得(de)裝設熔斷(duan)器(qi)及開關(guan)的(de)(de)。

在單相(xiang)供(gong)(gong)電(dian)(dian)線(xian)路，零(ling)線(xian)和(he)相(xiang)線(xian)電(dian)(dian)流(liu)是(shi)(shi)相(xiang)等的(de)(de)，所以(yi)(yi)零(ling)線(xian)和(he)相(xiang)線(xian)線(xian)徑(jing)(jing)必(bi)須一樣大(da)。在三相(xiang)四線(xian)供(gong)(gong)電(dian)(dian)線(xian)路中，零(ling)線(xian)是(shi)(shi)用來平(ping)(ping)衡(heng)三相(xiang)不(bu)平(ping)(ping)橫電(dian)(dian)流(liu)的(de)(de)，在三相(xiang)***不(bu)平(ping)(ping)衡(heng)的(de)(de)情(qing)況下，零(ling)線(xian)也(ye)只有(you)1/3相(xiang)線(xian)的(de)(de)電(dian)(dian)流(liu)量（三相(xiang)有(you)二(er)相(xiang)斷路的(de)(de)情(qing)況下除(chu)外），所以(yi)(yi)為了節省線(xian)路成本(ben)，以(yi)(yi)前的(de)(de)1KV低壓電(dian)(dian)纜零(ling)線(xian)的(de)(de)線(xian)徑(jing)(jing)只有(you)相(xiang)線(xian)線(xian)徑(jing)(jing)的(de)(de)1/3左右(you)，現在加(jia)大(da)零(ling)線(xian)基本(ben)上都(dou)是(shi)(shi)1/2。進口(kou)電(dian)(dian)纜大(da)體都(dou)是(shi)(shi)四線(xian)線(xian)徑(jing)(jing)一樣。