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零線為什么會帶電

正常情況下，零線上(shang)不應該有電(dian)。所以，一(yi)旦有電(dian)，肯定是故障的(de)表現；最簡單的(de)就(jiu)是電(dian)磁感應，而且這時候零線沒有良(liang)好接地(di)，未能(neng)形成回路(lu)。

其次，用電(dian)(dian)設備(bei)漏電(dian)(dian)或者相(xiang)線碰殼，但是電(dian)(dian)流(liu)不(bu)(bu)算大，因此還沒有跳(tiao)閘(zha)。在三相(xiang)四線制(zhi)的供電(dian)(dian)系統中(zhong)，如(ru)果(guo)零(ling)線接地(di)不(bu)(bu)好(hao)或者接地(di)端斷了，其后果(guo)是在三相(xiang)負載不(bu)(bu)平(ping)衡(heng)時使(shi)零(ling)線的電(dian)(dian)位不(bu)(bu)等于0，也就是說中(zhong)性點發生偏移。

具(ju)體(ti)零(ling)線電(dian)位(wei)多(duo)少與(yu)三相負(fu)載(zai)不(bu)平衡度有關，越不(bu)平衡，中(zhong)性(xing)點(dian)偏移就(jiu)越大，零(ling)線的電(dian)位(wei)就(jiu)越高。零(ling)線電(dian)位(wei)偏移后(hou)三相的相電(dian)壓(ya)一般就(jiu)不(bu)是220V了。有的相可能(neng)超過220V，有的相則(ze)可能(neng)低于220V。

當中(zhong)性點偏移(yi)量太大，三相(xiang)的(de)(de)相(xiang)電(dian)(dian)壓增加的(de)(de)相(xiang)就(jiu)可(ke)能使(shi)其用電(dian)(dian)電(dian)(dian)器(qi)燒毀，三相(xiang)的(de)(de)相(xiang)電(dian)(dian)壓減少的(de)(de)相(xiang)就(jiu)可(ke)能使(shi)其用電(dian)(dian)電(dian)(dian)器(qi)不能工作。零線(xian)的(de)(de)電(dian)(dian)位(wei)升高后，達到一定的(de)(de)值時(shi)觸地線(xian)將會造成觸電(dian)(dian)事故危險。

零線漏電會跳閘嗎

零線(xian)(xian)(xian)對地(di)(di)(di)(di)漏(lou)電(dian)(dian)(dian)(dian)，會(hui)(hui)(hui)導致(zhi)流(liu)(liu)過漏(lou)電(dian)(dian)(dian)(dian)斷(duan)路器(qi)的電(dian)(dian)(dian)(dian)流(liu)(liu)不平衡，從而觸(chu)(chu)發(fa)漏(lou)電(dian)(dian)(dian)(dian)斷(duan)路器(qi)跳(tiao)閘(zha)。如果(guo)零線(xian)(xian)(xian)在漏(lou)電(dian)(dian)(dian)(dian)保(bao)護器(qi)之后接(jie)(jie)地(di)(di)(di)(di)，也有電(dian)(dian)(dian)(dian)流(liu)(liu)流(liu)(liu)過漏(lou)電(dian)(dian)(dian)(dian)的地(di)(di)(di)(di)方(fang)，因此會(hui)(hui)(hui)引起跳(tiao)閘(zha)。一根(gen)線(xian)(xian)(xian)對地(di)(di)(di)(di)有電(dian)(dian)(dian)(dian)流(liu)(liu)，就(jiu)會(hui)(hui)(hui)導致(zhi)零序(xu)互感器(qi)產(chan)生(sheng)信號。只(zhi)要有大(da)于30mA時，漏(lou)電(dian)(dian)(dian)(dian)保(bao)護就(jiu)會(hui)(hui)(hui)執行跳(tiao)閘(zha)動作。零線(xian)(xian)(xian)帶電(dian)(dian)(dian)(dian)是沒(mei)有良好接(jie)(jie)地(di)(di)(di)(di)的體現，如果(guo)良好接(jie)(jie)地(di)(di)(di)(di)了(le)，電(dian)(dian)(dian)(dian)流(liu)(liu)會(hui)(hui)(hui)流(liu)(liu)入地(di)(di)(di)(di)下，用(yong)電(dian)(dian)(dian)(dian)筆(bi)將會(hui)(hui)(hui)檢(jian)測(ce)不出來。如果(guo)用(yong)電(dian)(dian)(dian)(dian)筆(bi)檢(jian)測(ce)出零線(xian)(xian)(xian)帶電(dian)(dian)(dian)(dian)，可(ke)(ke)能(neng)是零線(xian)(xian)(xian)斷(duan)了(le)，可(ke)(ke)能(neng)是接(jie)(jie)觸(chu)(chu)不好，這是零線(xian)(xian)(xian)帶電(dian)(dian)(dian)(dian)的原因結(jie)果(guo)。

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