欠壓保護是什么意思

欠(qian)壓(ya)(ya)(ya)(ya)保護顧名思義就(jiu)(jiu)是電(dian)壓(ya)(ya)(ya)(ya)不(bu)夠，也(ye)可以說電(dian)壓(ya)(ya)(ya)(ya)低于額定電(dian)壓(ya)(ya)(ya)(ya)一定幅度的(de)現象，具體來說電(dian)氣設備(bei)要在額定電(dian)壓(ya)(ya)(ya)(ya)下(xia)工(gong)作才是最佳的(de)狀態，但是電(dian)壓(ya)(ya)(ya)(ya)不(bu)可能保持(chi)穩(wen)定不(bu)變，所以一般電(dian)壓(ya)(ya)(ya)(ya)波動的(de)標準要求范圍是在±15%內，舉(ju)個例子，如日光燈(deng)正常電(dian)壓(ya)(ya)(ya)(ya)是220V，當低于15%以下(xia)就(jiu)(jiu)是欠(qian)壓(ya)(ya)(ya)(ya)，低于15%也(ye)說是在187V下(xia)相當是欠(qian)壓(ya)(ya)(ya)(ya)工(gong)作，這容易損(sun)壞(huai)日光燈(deng)，損(sun)壞(huai)日光燈(deng)看似很(hen)少的(de)事(shi)，但是作為高壓(ya)(ya)(ya)(ya)系統(tong)中來說，欠(qian)壓(ya)(ya)(ya)(ya)就(jiu)(jiu)會引起電(dian)氣設備(bei)損(sun)壞(huai)造(zao)成停電(dian)等事(shi)故。

上面說(shuo)到的欠(qian)(qian)壓(ya)，那欠(qian)(qian)壓(ya)保(bao)護(hu)是(shi)什(shen)么意思呢(ni)?當電(dian)(dian)力系統中出現欠(qian)(qian)壓(ya)時我們(men)要(yao)對設(she)置(zhi)進行(xing)(xing)保(bao)護(hu)，欠(qian)(qian)壓(ya)保(bao)護(hu)裝置(zhi)動(dong)作使(shi)(shi)用設(she)備停止運(yun)行(xing)(xing)或是(shi)斷路器跳(tiao)閘(zha)。為(wei)什(shen)么要(yao)使(shi)(shi)用設(she)備停止運(yun)行(xing)(xing)，拿電(dian)(dian)機(ji)(ji)來說(shuo)，當電(dian)(dian)機(ji)(ji)在欠(qian)(qian)壓(ya)下(xia)(xia)(xia)工作時，因動(dong)力不足使(shi)(shi)電(dian)(dian)動(dong)機(ji)(ji)疲(pi)倒、堵轉(zhuan)，從而產生(sheng)數倍于額(e)定電(dian)(dian)流(liu)(liu)的過電(dian)(dian)流(liu)(liu)，燒壞電(dian)(dian)動(dong)機(ji)(ji);當電(dian)(dian)壓(ya)恢復時，大(da)量電(dian)(dian)動(dong)機(ji)(ji)的自起動(dong)又會使(shi)(shi)電(dian)(dian)動(dong)機(ji)(ji)的電(dian)(dian)壓(ya)大(da)幅度下(xia)(xia)(xia)降，造成危害(hai)。 所以欠(qian)(qian)壓(ya)保(bao)護(hu)就(jiu)是(shi)要(yao)在欠(qian)(qian)壓(ya)情況下(xia)(xia)(xia)進行(xing)(xing)保(bao)護(hu)動(dong)作，以達保(bao)護(hu)設(she)備的目的。

電壓互感器二次電壓可以作為工作電源嗎

不能，不可取

電(dian)壓互(hu)感器一次(ci)側接在一次(ci)系統，二次(ci)側感應電(dian)壓提供給測量(liang)儀表、繼電(dian)保護等設備。主要作(zuo)為計量(liang)及保護之用，而不是用于工作(zuo)電(dian)源，再(zai)說電(dian)壓互(hu)感器的(de)額定電(dian)流很小。