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燒斷零線(xian)的原因。1、零線(xian)接線(xian)頭處(chu)理的不(bu)合格。2、系統中三相負(fu)載(zai)嚴重的不(bu)平(ping)衡。3、解(jie)決的辦法(fa)是(shi)重新平(ping)衡三相負(fu)載(zai)，負(fu)載(zai)相對平(ping)衡了，零線(xian)的電流就減小于了。

其實燒斷零線(xian)(xian)的主要原還是(shi)(shi)(shi)在(zai)于供(gong)電(dian)的方(fang)式(shi)(shi)。如果你的供(gong)電(dian)方(fang)式(shi)(shi)是(shi)(shi)(shi)四線(xian)(xian)380伏使用，相線(xian)(xian)與零線(xian)(xian)線(xian)(xian)徑應(ying)(ying)(ying)該一樣(yang)大或者可(ke)以(yi)小(xiao)一點(dian)，因為(wei)此方(fang)式(shi)(shi)是(shi)(shi)(shi)以(yi)380伏用電(dian)器為(wei)主，三相電(dian)流(liu)比(bi)較平衡(heng)。如果供(gong)電(dian)方(fang)式(shi)(shi)是(shi)(shi)(shi)三相220伏四線(xian)(xian)供(gong)電(dian)方(fang)式(shi)(shi)，那(nei)它的零線(xian)(xian)總(zong)(zong)線(xian)(xian)應(ying)(ying)(ying)比(bi)相線(xian)(xian)大，因為(wei)相線(xian)(xian)與零線(xian)(xian)所(suo)流(liu)過的電(dian)流(liu)是(shi)(shi)(shi)同(tong)樣(yang)的，而且(qie)三相電(dian)流(liu)是(shi)(shi)(shi)不平衡(heng)的，所(suo)以(yi)總(zong)(zong)零線(xian)(xian)的載(zai)流(liu)量應(ying)(ying)(ying)是(shi)(shi)(shi)三相220伏用電(dian)流(liu)量的總(zong)(zong)和。

三相(xiang)(xiang)四線(xian)(xian)制供(gong)電電路，零線(xian)(xian)應不小于***大不平衡負荷電流的(de)方式(shi)來(lai)選(xuan)擇截面積(ji)，單相(xiang)(xiang)供(gong)電則選(xuan)用與相(xiang)(xiang)線(xian)(xian)一樣的(de)截面積(ji)！

一般燒毀(hui)(hui)的應當(dang)(dang)是(shi)火線，不應當(dang)(dang)是(shi)零(ling)(ling)線，如果老(lao)是(shi)零(ling)(ling)線燒毀(hui)(hui)，就(jiu)應當(dang)(dang)查查線路和負(fu)載。火線燒毀(hui)(hui)是(shi)正常，零(ling)(ling)線老(lao)燒毀(hui)(hui)就(jiu)得引起注意。

三(san)(san)相(xiang)四(si)線(xian)(xian)供配(pei)(pei)電(dian)的(de)(de)(de)零線(xian)(xian)經(jing)常燒斷，實際(ji)上現在的(de)(de)(de)三(san)(san)相(xiang)四(si)線(xian)(xian)供配(pei)(pei)電(dian)線(xian)(xian)路上的(de)(de)(de)零線(xian)(xian)都(dou)在沿供配(pei)(pei)電(dian)線(xian)(xian)路的(de)(de)(de)干線(xian)(xian)及支線(xian)(xian)都(dou)有密集的(de)(de)(de)重(zhong)復接地的(de)(de)(de)（因(yin)為(wei)電(dian)力法規定(ding)：用戶計量裝置前的(de)(de)(de)產權屬供電(dian)方(fang)所有，因(yin)此(ci)而(er)造成用戶的(de)(de)(de)損(sun)失也得(de)由供電(dian)方(fang)負責。）。而(er)且更不是(shi)文章所說(shuo)的(de)(de)(de)三(san)(san)相(xiang)四(si)的(de)(de)(de)線(xian)(xian)零線(xian)(xian)上的(de)(de)(de)熔(rong)斷器熔(rong)斷或開(kai)關(guan)斷開(kai)所致的(de)(de)(de)零線(xian)(xian)斷路，因(yin)為(wei)“安全規程”規定(ding)三(san)(san)相(xiang)四(si)線(xian)(xian)中的(de)(de)(de)零線(xian)(xian)是(shi)不得(de)裝設熔(rong)斷器及開(kai)關(guan)的(de)(de)(de)。

在(zai)(zai)單相(xiang)供電(dian)(dian)線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)，零(ling)(ling)(ling)(ling)線(xian)(xian)(xian)(xian)(xian)(xian)和(he)相(xiang)線(xian)(xian)(xian)(xian)(xian)(xian)電(dian)(dian)流是(shi)相(xiang)等的(de)，所以(yi)零(ling)(ling)(ling)(ling)線(xian)(xian)(xian)(xian)(xian)(xian)和(he)相(xiang)線(xian)(xian)(xian)(xian)(xian)(xian)線(xian)(xian)(xian)(xian)(xian)(xian)徑(jing)必(bi)須一樣大(da)。在(zai)(zai)三(san)相(xiang)四(si)線(xian)(xian)(xian)(xian)(xian)(xian)供電(dian)(dian)線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)中，零(ling)(ling)(ling)(ling)線(xian)(xian)(xian)(xian)(xian)(xian)是(shi)用來平(ping)衡三(san)相(xiang)不(bu)平(ping)橫(heng)電(dian)(dian)流的(de)，在(zai)(zai)三(san)相(xiang)***不(bu)平(ping)衡的(de)情(qing)況下，零(ling)(ling)(ling)(ling)線(xian)(xian)(xian)(xian)(xian)(xian)也(ye)只有1/3相(xiang)線(xian)(xian)(xian)(xian)(xian)(xian)的(de)電(dian)(dian)流量（三(san)相(xiang)有二相(xiang)斷路(lu)的(de)情(qing)況下除(chu)外），所以(yi)為了(le)節省線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)成本(ben)，以(yi)前的(de)1KV低壓電(dian)(dian)纜(lan)(lan)零(ling)(ling)(ling)(ling)線(xian)(xian)(xian)(xian)(xian)(xian)的(de)線(xian)(xian)(xian)(xian)(xian)(xian)徑(jing)只有相(xiang)線(xian)(xian)(xian)(xian)(xian)(xian)線(xian)(xian)(xian)(xian)(xian)(xian)徑(jing)的(de)1/3左右，現(xian)在(zai)(zai)加大(da)零(ling)(ling)(ling)(ling)線(xian)(xian)(xian)(xian)(xian)(xian)基(ji)本(ben)上都是(shi)1/2。進口電(dian)(dian)纜(lan)(lan)大(da)體都是(shi)四(si)線(xian)(xian)(xian)(xian)(xian)(xian)線(xian)(xian)(xian)(xian)(xian)(xian)徑(jing)一樣。