闡(chan)述保護(hu)用電(dian)(dian)(dian)(dian)(dian)流(liu)互感器(qi)(qi)（TA）主要與繼電(dian)(dian)(dian)(dian)(dian)保護(hu)裝置(zhi)配合使(shi)用。如果發生(sheng)短路或線路過載，它會向繼電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)設備發出(chu)信號，以(yi)切斷故障(zhang)電(dian)(dian)(dian)(dian)(dian)路，以(yi)保護(hu)電(dian)(dian)(dian)(dian)(dian)源系統的(de)(de)安(an)全。工作條(tiao)件與換(huan)能(neng)器(qi)(qi)根本不同。傳感器(qi)(qi)的(de)(de)正常初(chu)級電(dian)(dian)(dian)(dian)(dian)流(liu)工作范(fan)圍相(xiang)當準確。如果故障(zhang)短路電(dian)(dian)(dian)(dian)(dian)流(liu)通過，則變壓(ya)器(qi)(qi)應盡(jin)快飽和(he)，以(yi)保護(hu)儀表(biao)不受(shou)短路電(dian)(dian)(dian)(dian)(dian)流(liu)的(de)(de)損害。前者(zhe)僅在(zai)電(dian)(dian)(dian)(dian)(dian)流(liu)大于正常電(dian)(dian)(dian)(dian)(dian)流(liu)幾倍(bei)或十(shi)倍(bei)并且其(qi)誤(wu)差(cha)(cha)（電(dian)(dian)(dian)(dian)(dian)流(liu)和(he)相(xiang)位誤(wu)差(cha)(cha)）必須在(zai)誤(wu)差(cha)(cha)曲線范(fan)圍內時才開始工作。當同時評估(gu)電(dian)(dian)(dian)(dian)(dian)流(liu)誤(wu)差(cha)(cha)和(he)相(xiang)位差(cha)(cha)時，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(chan)廠家(jia)一開始(shi)的保護(hu)(hu)是多個繼電(dian)器具有不同的功(gong)能。然后，不同的繼電(dian)器在(zai)電(dian)路中發揮(hui)各自的保護(hu)(hu)功(gong)能。

負(fu)荷(he)開(kai)關(guan)(guan)：負(fu)荷(he)開(kai)關(guan)(guan)具有(you)簡單(dan)的(de)滅弧(hu)裝置(zhi)。滅弧(hu)介質通常是(shi)(shi)空氣(qi)，它(ta)可以(yi)產(chan)生(sheng)并中(zhong)斷某些電(dian)流和過電(dian)流，但(dan)不(bu)能(neng)中(zhong)斷短路(lu)電(dian)流，也不(bu)能(neng)用(yong)于消(xiao)除短路(lu)故(gu)障。因(yin)此，不(bu)允許簡單(dan)地使(shi)用(yong)負(fu)載開(kai)關(guan)(guan)來替代斷路(lu)器(qi)。如果要使(shi)用(yong)斷路(lu)器(qi)，則(ze)必須將(jiang)它(ta)們與上述高(gao)壓熔(rong)斷器(qi)結合使(shi)用(yong)（實(shi)際上，斷路(lu)器(qi)和斷路(lu)器(qi)通常串聯使(shi)用(yong)，以(yi)提供簡單(dan)的(de)過載保(bao)護(hu)。以(yi)降(jiang)低項(xiang)目(mu)成本(ben)）。負(fu)載開(kai)關(guan)(guan)類似(si)于隔離(li)刀，并且(qie)有(you)明顯的(de)隔離(li)間隙，很容易判斷電(dian)路(lu)是(shi)(shi)打開(kai)還是(shi)(shi)關(guan)(guan)閉。