闡述保(bao)護(hu)用電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)互感(gan)(gan)器(qi)（TA）主(zhu)要與(yu)繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)保(bao)護(hu)裝置配合使(shi)用。如果發(fa)生短路(lu)(lu)或線(xian)路(lu)(lu)過載，它會向繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)設備發(fa)出信號，以(yi)切斷故障(zhang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)，以(yi)保(bao)護(hu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)系統(tong)的安全。工作條件與(yu)換能器(qi)根本不(bu)同。傳感(gan)(gan)器(qi)的正(zheng)常初(chu)級電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)工作范(fan)圍相當準確。如果故障(zhang)短路(lu)(lu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)通過，則變壓(ya)器(qi)應盡快飽和(he)，以(yi)保(bao)護(hu)儀表不(bu)受短路(lu)(lu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的損害。前者僅在電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)大于正(zheng)常電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)幾倍或十(shi)倍并且其(qi)誤(wu)差(cha)(cha)（電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)和(he)相位誤(wu)差(cha)(cha)）必須在誤(wu)差(cha)(cha)曲線(xian)范(fan)圍內時(shi)才開始(shi)工作。當同時(shi)評估電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)誤(wu)差(cha)(cha)和(he)相位差(cha)(cha)時(shi)，將使(shi)用復合誤(wu)差(cha)(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）。生產廠家一開(kai)始的(de)(de)保護(hu)是多個繼電器具有(you)不同(tong)的(de)(de)功(gong)能。然后，不同(tong)的(de)(de)繼電器在電路中發揮各自的(de)(de)保護(hu)功(gong)能。

負荷開(kai)關：負荷開(kai)關具(ju)有(you)簡單的(de)滅弧裝置。滅弧介質通常是空氣，它可以產生并(bing)中斷(duan)(duan)某些電流(liu)(liu)(liu)和過電流(liu)(liu)(liu)，但(dan)不(bu)能中斷(duan)(duan)短路(lu)電流(liu)(liu)(liu)，也不(bu)能用(yong)(yong)于(yu)消除(chu)短路(lu)故障。因此，不(bu)允許(xu)簡單地使(shi)用(yong)(yong)負載開(kai)關來替代斷(duan)(duan)路(lu)器(qi)。如果要使(shi)用(yong)(yong)斷(duan)(duan)路(lu)器(qi)，則必(bi)須將它們與上述(shu)高壓熔斷(duan)(duan)器(qi)結合使(shi)用(yong)(yong)（實際(ji)上，斷(duan)(duan)路(lu)器(qi)和斷(duan)(duan)路(lu)器(qi)通常串(chuan)聯使(shi)用(yong)(yong)，以提供簡單的(de)過載保護。以降低(di)項(xiang)目(mu)成(cheng)本）。負載開(kai)關類似于(yu)隔(ge)離刀(dao)，并(bing)且(qie)有(you)明顯的(de)隔(ge)離間隙，很容易判斷(duan)(duan)電路(lu)是打(da)開(kai)還是關閉。