闡述保(bao)護(hu)用電(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(hu)裝(zhuang)置配合使(shi)用。如果發生短路(lu)(lu)或(huo)線路(lu)(lu)過載，它會(hui)向繼電(dian)(dian)(dian)(dian)(dian)器(qi)設備發出信號，以切(qie)斷(duan)故(gu)障電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)，以保(bao)護(hu)電(dian)(dian)(dian)(dian)(dian)源系(xi)統的安(an)全。工作條(tiao)件(jian)與換能器(qi)根本不(bu)同(tong)。傳感(gan)器(qi)的正常(chang)初級電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)工作范圍(wei)相當準確。如果故(gu)障短路(lu)(lu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)通過，則變壓器(qi)應盡(jin)快飽和(he)，以保(bao)護(hu)儀表(biao)不(bu)受短路(lu)(lu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的損(sun)害(hai)。前者僅在(zai)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)大于正常(chang)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)幾倍(bei)或(huo)十倍(bei)并且其誤(wu)差(cha)(cha)(cha)（電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)和(he)相位(wei)誤(wu)差(cha)(cha)(cha)）必(bi)須在(zai)誤(wu)差(cha)(cha)(cha)曲線范圍(wei)內時(shi)才開始工作。當同(tong)時(shi)評(ping)估(gu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)誤(wu)差(cha)(cha)(cha)和(he)相位(wei)差(cha)(cha)(cha)時(shi)，將使(shi)用復合誤(wu)差(cha)(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）。生產廠家一開始的保護是多(duo)個繼電(dian)(dian)器具有不同的功能。然后，不同的繼電(dian)(dian)器在電(dian)(dian)路中發揮各(ge)自的保護功能。

負荷開(kai)(kai)關(guan)：負荷開(kai)(kai)關(guan)具有(you)簡單(dan)(dan)的滅(mie)(mie)弧裝(zhuang)置。滅(mie)(mie)弧介(jie)質通(tong)常是空氣(qi)，它可以(yi)產生并中斷(duan)(duan)某些(xie)電流(liu)和(he)過(guo)電流(liu)，但不能(neng)中斷(duan)(duan)短(duan)路電流(liu)，也不能(neng)用(yong)(yong)(yong)于消除(chu)短(duan)路故障。因此(ci)，不允(yun)許簡單(dan)(dan)地使(shi)用(yong)(yong)(yong)負載(zai)開(kai)(kai)關(guan)來替代斷(duan)(duan)路器。如果(guo)要使(shi)用(yong)(yong)(yong)斷(duan)(duan)路器，則(ze)必(bi)須(xu)將它們與上(shang)述高壓熔(rong)斷(duan)(duan)器結合使(shi)用(yong)(yong)(yong)（實際上(shang)，斷(duan)(duan)路器和(he)斷(duan)(duan)路器通(tong)常串聯(lian)使(shi)用(yong)(yong)(yong)，以(yi)提(ti)供簡單(dan)(dan)的過(guo)載(zai)保護(hu)。以(yi)降(jiang)低項目成本）。負載(zai)開(kai)(kai)關(guan)類似于隔離(li)刀，并且有(you)明顯的隔離(li)間隙(xi)，很容易(yi)判斷(duan)(duan)電路是打開(kai)(kai)還是關(guan)閉。