闡述保(bao)(bao)(bao)護(hu)用電(dian)(dian)(dian)流(liu)(liu)(liu)互感器（TA）主(zhu)要與繼(ji)電(dian)(dian)(dian)保(bao)(bao)(bao)護(hu)裝置配合使用。如(ru)果發生短路(lu)或(huo)線路(lu)過載，它會向繼(ji)電(dian)(dian)(dian)器設備發出信號，以(yi)(yi)切斷故(gu)障電(dian)(dian)(dian)路(lu)，以(yi)(yi)保(bao)(bao)(bao)護(hu)電(dian)(dian)(dian)源系統(tong)的安全。工(gong)作(zuo)條件與換(huan)能器根本不同(tong)。傳感器的正常(chang)(chang)初級電(dian)(dian)(dian)流(liu)(liu)(liu)工(gong)作(zuo)范圍相(xiang)當準確。如(ru)果故(gu)障短路(lu)電(dian)(dian)(dian)流(liu)(liu)(liu)通過，則變(bian)壓(ya)器應盡快飽(bao)和(he)，以(yi)(yi)保(bao)(bao)(bao)護(hu)儀表不受(shou)短路(lu)電(dian)(dian)(dian)流(liu)(liu)(liu)的損害(hai)。前者僅在(zai)電(dian)(dian)(dian)流(liu)(liu)(liu)大于正常(chang)(chang)電(dian)(dian)(dian)流(liu)(liu)(liu)幾倍或(huo)十倍并且其誤(wu)差（電(dian)(dian)(dian)流(liu)(liu)(liu)和(he)相(xiang)位(wei)誤(wu)差）必(bi)須在(zai)誤(wu)差曲線范圍內時才開始(shi)工(gong)作(zuo)。當同(tong)時評估電(dian)(dian)(dian)流(liu)(liu)(liu)誤(wu)差和(he)相(xiang)位(wei)差時，將使用復(fu)合誤(wu)差。

高壓柜的保護模式包括通過保險絲或繼電器保護（動作）關閉或報警電氣開關。如果保險絲燒斷，則斷路器跳閘的保護方法是機械跳閘保護。繼電保護是一種由各種繼電器組成的保護電路，當使用信號繼電器發出信號（或聲光信號）以完成警報時，會使繼電器跳閘。斷路器本身沒有保護功能，只能起到中斷電流和電弧的作用。高壓柜主要由斷路器，保護裝置和電路組成。高壓柜的保護由保護繼電器完成（常規保護方法或綜合保護方法）。生(sheng)產(chan)廠(chang)家(jia)一開始(shi)的保(bao)護是多個繼電器(qi)具有(you)不(bu)同的功能。然后，不(bu)同的繼電器(qi)在(zai)電路中發揮各自(zi)的保(bao)護功能。

負(fu)荷開(kai)(kai)關(guan)(guan)(guan)：負(fu)荷開(kai)(kai)關(guan)(guan)(guan)具有簡(jian)單(dan)(dan)的滅(mie)弧(hu)裝(zhuang)置。滅(mie)弧(hu)介質(zhi)通(tong)常(chang)是空氣，它可以產生并中斷(duan)(duan)某些電(dian)流和過電(dian)流，但不(bu)能中斷(duan)(duan)短路(lu)電(dian)流，也(ye)不(bu)能用(yong)(yong)(yong)于(yu)消除(chu)短路(lu)故障。因此，不(bu)允許(xu)簡(jian)單(dan)(dan)地(di)使(shi)用(yong)(yong)(yong)負(fu)載開(kai)(kai)關(guan)(guan)(guan)來替代斷(duan)(duan)路(lu)器(qi)。如果要使(shi)用(yong)(yong)(yong)斷(duan)(duan)路(lu)器(qi)，則必須(xu)將它們與(yu)上(shang)述高壓熔(rong)斷(duan)(duan)器(qi)結合使(shi)用(yong)(yong)(yong)（實際(ji)上(shang)，斷(duan)(duan)路(lu)器(qi)和斷(duan)(duan)路(lu)器(qi)通(tong)常(chang)串聯使(shi)用(yong)(yong)(yong)，以提供(gong)簡(jian)單(dan)(dan)的過載保護。以降低項目成本）。負(fu)載開(kai)(kai)關(guan)(guan)(guan)類似于(yu)隔離刀，并且有明顯的隔離間隙，很容易判斷(duan)(duan)電(dian)路(lu)是打(da)開(kai)(kai)還是關(guan)(guan)(guan)閉。