闡(chan)述保(bao)(bao)護用電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)互感器(qi)（TA）主要與繼電(dian)(dian)(dian)(dian)(dian)(dian)保(bao)(bao)護裝置配合使用。如果(guo)發生短路(lu)(lu)或線(xian)路(lu)(lu)過載，它會向繼電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)設備(bei)發出信號，以(yi)切斷(duan)故障電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)，以(yi)保(bao)(bao)護電(dian)(dian)(dian)(dian)(dian)(dian)源系(xi)統(tong)的(de)安(an)全。工作(zuo)條件與換能器(qi)根本不同。傳感器(qi)的(de)正常初級(ji)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)工作(zuo)范圍相(xiang)當準(zhun)確(que)。如果(guo)故障短路(lu)(lu)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)通過，則變壓(ya)器(qi)應盡快(kuai)飽(bao)和，以(yi)保(bao)(bao)護儀表不受短路(lu)(lu)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)的(de)損害。前(qian)者僅在電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)大于正常電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)幾倍(bei)或十倍(bei)并且(qie)其(qi)誤差(cha)（電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)和相(xiang)位誤差(cha)）必須在誤差(cha)曲線(xian)范圍內時(shi)(shi)(shi)才開(kai)始工作(zuo)。當同時(shi)(shi)(shi)評(ping)估電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)誤差(cha)和相(xiang)位差(cha)時(shi)(shi)(shi)，將使用復合誤差(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）。生產廠家一開始(shi)的(de)保護是(shi)多個繼(ji)電(dian)器具有(you)不同的(de)功能。然后，不同的(de)繼(ji)電(dian)器在電(dian)路中發揮各自(zi)的(de)保護功能。

負荷開(kai)(kai)(kai)關(guan)(guan)：負荷開(kai)(kai)(kai)關(guan)(guan)具有(you)簡單的(de)滅(mie)弧(hu)(hu)裝置。滅(mie)弧(hu)(hu)介(jie)質通常是空氣，它可(ke)以(yi)產生并中斷某(mou)些電(dian)流(liu)和過(guo)電(dian)流(liu)，但(dan)不能中斷短(duan)路電(dian)流(liu)，也不能用(yong)(yong)于消除短(duan)路故障。因此(ci)，不允許簡單地使(shi)(shi)用(yong)(yong)負載開(kai)(kai)(kai)關(guan)(guan)來替代斷路器(qi)(qi)。如果要使(shi)(shi)用(yong)(yong)斷路器(qi)(qi)，則(ze)必須將它們與(yu)上(shang)述高壓熔(rong)斷器(qi)(qi)結(jie)合(he)使(shi)(shi)用(yong)(yong)（實際上(shang)，斷路器(qi)(qi)和斷路器(qi)(qi)通常串(chuan)聯使(shi)(shi)用(yong)(yong)，以(yi)提(ti)供(gong)簡單的(de)過(guo)載保(bao)護(hu)。以(yi)降低項(xiang)目成本(ben)）。負載開(kai)(kai)(kai)關(guan)(guan)類似于隔離刀，并且(qie)有(you)明顯的(de)隔離間(jian)隙，很容易(yi)判斷電(dian)路是打開(kai)(kai)(kai)還是關(guan)(guan)閉。