闡述保(bao)護(hu)用(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)流互感器(qi)（TA）主要與(yu)繼電(dian)(dian)(dian)(dian)(dian)(dian)保(bao)護(hu)裝(zhuang)置配合使用(yong)(yong)。如果發生短路(lu)或(huo)線路(lu)過載，它會向繼電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)設備發出信號(hao)，以(yi)切斷故(gu)障(zhang)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)，以(yi)保(bao)護(hu)電(dian)(dian)(dian)(dian)(dian)(dian)源系統的(de)安(an)全。工作(zuo)條(tiao)件與(yu)換能器(qi)根本不同(tong)。傳感器(qi)的(de)正常初級電(dian)(dian)(dian)(dian)(dian)(dian)流工作(zuo)范圍相當準確。如果故(gu)障(zhang)短路(lu)電(dian)(dian)(dian)(dian)(dian)(dian)流通過，則變壓(ya)器(qi)應盡快飽(bao)和(he)(he)，以(yi)保(bao)護(hu)儀表不受(shou)短路(lu)電(dian)(dian)(dian)(dian)(dian)(dian)流的(de)損害。前者(zhe)僅(jin)在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)流大于正常電(dian)(dian)(dian)(dian)(dian)(dian)流幾倍或(huo)十倍并且其誤(wu)差（電(dian)(dian)(dian)(dian)(dian)(dian)流和(he)(he)相位誤(wu)差）必須在(zai)誤(wu)差曲線范圍內(nei)時(shi)(shi)才開始工作(zuo)。當同(tong)時(shi)(shi)評估電(dian)(dian)(dian)(dian)(dian)(dian)流誤(wu)差和(he)(he)相位差時(shi)(shi)，將(jiang)使用(yong)(yong)復合誤(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(shi)的(de)保護是(shi)多個繼電(dian)器(qi)具(ju)有不同(tong)(tong)的(de)功能。然(ran)后，不同(tong)(tong)的(de)繼電(dian)器(qi)在電(dian)路中發揮各自的(de)保護功能。

負(fu)荷(he)開(kai)關：負(fu)荷(he)開(kai)關具有簡(jian)單(dan)的滅弧裝置。滅弧介質通(tong)常是(shi)空氣，它可以(yi)產(chan)生并中斷(duan)(duan)(duan)某些電(dian)流和(he)過(guo)電(dian)流，但不能(neng)中斷(duan)(duan)(duan)短(duan)路(lu)(lu)電(dian)流，也不能(neng)用(yong)于消除短(duan)路(lu)(lu)故(gu)障。因(yin)此，不允(yun)許簡(jian)單(dan)地使用(yong)負(fu)載開(kai)關來替代斷(duan)(duan)(duan)路(lu)(lu)器。如果(guo)要(yao)使用(yong)斷(duan)(duan)(duan)路(lu)(lu)器，則必須將它們與上述高壓熔斷(duan)(duan)(duan)器結(jie)合(he)使用(yong)（實際上，斷(duan)(duan)(duan)路(lu)(lu)器和(he)斷(duan)(duan)(duan)路(lu)(lu)器通(tong)常串聯使用(yong)，以(yi)提供簡(jian)單(dan)的過(guo)載保護(hu)。以(yi)降低項目成本）。負(fu)載開(kai)關類似(si)于隔離刀，并且有明顯的隔離間(jian)隙(xi)，很容易判(pan)斷(duan)(duan)(duan)電(dian)路(lu)(lu)是(shi)打開(kai)還是(shi)關閉。