闡述保(bao)護用(yong)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)互感器(qi)（TA）主要與繼電(dian)(dian)(dian)(dian)(dian)保(bao)護裝(zhuang)置配(pei)合(he)使用(yong)。如果發(fa)生短路(lu)(lu)或(huo)線(xian)路(lu)(lu)過(guo)(guo)載，它會向繼電(dian)(dian)(dian)(dian)(dian)器(qi)設備發(fa)出信(xin)號，以(yi)切斷故障(zhang)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)，以(yi)保(bao)護電(dian)(dian)(dian)(dian)(dian)源系(xi)統的安全。工(gong)作條件與換能器(qi)根本不同。傳感器(qi)的正常初(chu)級電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)工(gong)作范圍(wei)相(xiang)當(dang)準確。如果故障(zhang)短路(lu)(lu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)通過(guo)(guo)，則變(bian)壓器(qi)應盡(jin)快飽和，以(yi)保(bao)護儀表不受(shou)短路(lu)(lu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的損害。前者僅在電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)大于(yu)正常電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)幾倍(bei)或(huo)十倍(bei)并且其(qi)誤(wu)(wu)(wu)差（電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)和相(xiang)位誤(wu)(wu)(wu)差）必須在誤(wu)(wu)(wu)差曲線(xian)范圍(wei)內時(shi)才(cai)開始工(gong)作。當(dang)同時(shi)評估電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)誤(wu)(wu)(wu)差和相(xiang)位差時(shi)，將使用(yong)復合(he)誤(wu)(wu)(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）。生產廠家一開始的(de)(de)保護是多個繼電(dian)(dian)器具有不(bu)(bu)同的(de)(de)功能。然后，不(bu)(bu)同的(de)(de)繼電(dian)(dian)器在電(dian)(dian)路(lu)中發揮各自的(de)(de)保護功能。

負荷開(kai)關：負荷開(kai)關具有簡(jian)(jian)單的(de)(de)滅弧(hu)裝置。滅弧(hu)介質通常是空(kong)氣，它可以產生并(bing)中斷(duan)(duan)某些電(dian)(dian)流(liu)和過(guo)電(dian)(dian)流(liu)，但不能(neng)(neng)中斷(duan)(duan)短(duan)路(lu)(lu)電(dian)(dian)流(liu)，也不能(neng)(neng)用于消除短(duan)路(lu)(lu)故障。因此，不允(yun)許簡(jian)(jian)單地(di)使(shi)用負載開(kai)關來(lai)替代斷(duan)(duan)路(lu)(lu)器(qi)。如果要使(shi)用斷(duan)(duan)路(lu)(lu)器(qi)，則(ze)必須將它們與上(shang)述高壓熔(rong)斷(duan)(duan)器(qi)結合使(shi)用（實(shi)際上(shang)，斷(duan)(duan)路(lu)(lu)器(qi)和斷(duan)(duan)路(lu)(lu)器(qi)通常串聯(lian)使(shi)用，以提(ti)供簡(jian)(jian)單的(de)(de)過(guo)載保護。以降低項(xiang)目成本）。負載開(kai)關類似于隔(ge)離刀，并(bing)且有明顯的(de)(de)隔(ge)離間隙，很(hen)容易(yi)判斷(duan)(duan)電(dian)(dian)路(lu)(lu)是打開(kai)還(huan)是關閉(bi)。