闡述保(bao)護用(yong)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)互感(gan)器(qi)（TA）主要與繼電(dian)(dian)(dian)(dian)(dian)保(bao)護裝置配合(he)使(shi)用(yong)。如果發生短路(lu)或線(xian)路(lu)過載，它會向(xiang)繼電(dian)(dian)(dian)(dian)(dian)器(qi)設(she)備(bei)發出信號，以(yi)切斷故障電(dian)(dian)(dian)(dian)(dian)路(lu)，以(yi)保(bao)護電(dian)(dian)(dian)(dian)(dian)源系(xi)統的安全。工(gong)作(zuo)條件與換能器(qi)根(gen)本不(bu)同(tong)。傳感(gan)器(qi)的正(zheng)常初級(ji)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)工(gong)作(zuo)范圍相(xiang)當(dang)準確。如果故障短路(lu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)通過，則變壓器(qi)應(ying)盡快飽和(he)，以(yi)保(bao)護儀(yi)表不(bu)受短路(lu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的損害。前者僅(jin)在(zai)(zai)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)大于(yu)正(zheng)常電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)幾倍(bei)或十倍(bei)并且其(qi)誤差(cha)（電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)和(he)相(xiang)位誤差(cha)）必須在(zai)(zai)誤差(cha)曲線(xian)范圍內時(shi)才開(kai)始工(gong)作(zuo)。當(dang)同(tong)時(shi)評估電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)誤差(cha)和(he)相(xiang)位差(cha)時(shi)，將使(shi)用(yong)復合(he)誤差(cha)。

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）。生產廠家(jia)一開始的(de)保護(hu)是(shi)多(duo)個(ge)繼(ji)電器具有不(bu)同的(de)功能。然后，不(bu)同的(de)繼(ji)電器在電路中發揮各(ge)自(zi)的(de)保護(hu)功能。

負(fu)(fu)荷開(kai)(kai)關(guan)(guan)(guan)：負(fu)(fu)荷開(kai)(kai)關(guan)(guan)(guan)具有簡(jian)(jian)(jian)單(dan)的滅弧裝置。滅弧介質通(tong)常是(shi)(shi)空氣，它可以(yi)產生并(bing)中斷某些電流(liu)和(he)過電流(liu)，但(dan)不能(neng)中斷短路(lu)(lu)電流(liu)，也不能(neng)用(yong)于(yu)消除短路(lu)(lu)故障。因此，不允許(xu)簡(jian)(jian)(jian)單(dan)地使(shi)(shi)用(yong)負(fu)(fu)載開(kai)(kai)關(guan)(guan)(guan)來替(ti)代斷路(lu)(lu)器。如果要使(shi)(shi)用(yong)斷路(lu)(lu)器，則必須將它們與上述高(gao)壓(ya)熔(rong)斷器結合使(shi)(shi)用(yong)（實際上，斷路(lu)(lu)器和(he)斷路(lu)(lu)器通(tong)常串聯使(shi)(shi)用(yong)，以(yi)提(ti)供簡(jian)(jian)(jian)單(dan)的過載保護。以(yi)降低項目成本）。負(fu)(fu)載開(kai)(kai)關(guan)(guan)(guan)類似于(yu)隔離刀，并(bing)且(qie)有明顯的隔離間隙，很容易判斷電路(lu)(lu)是(shi)(shi)打開(kai)(kai)還是(shi)(shi)關(guan)(guan)(guan)閉。