闡述保(bao)護用電(dian)(dian)(dian)(dian)流(liu)互感器(qi)(qi)（TA）主要與(yu)繼電(dian)(dian)(dian)(dian)保(bao)護裝(zhuang)置配合(he)使(shi)用。如(ru)果發生短路或線路過載，它會(hui)向繼電(dian)(dian)(dian)(dian)器(qi)(qi)設備發出信號，以(yi)切斷故障(zhang)電(dian)(dian)(dian)(dian)路，以(yi)保(bao)護電(dian)(dian)(dian)(dian)源系統的安全(quan)。工(gong)作條件與(yu)換能(neng)器(qi)(qi)根本不同(tong)。傳感器(qi)(qi)的正常初(chu)級(ji)電(dian)(dian)(dian)(dian)流(liu)工(gong)作范(fan)圍相當準確。如(ru)果故障(zhang)短路電(dian)(dian)(dian)(dian)流(liu)通過，則變壓器(qi)(qi)應盡快飽和(he)，以(yi)保(bao)護儀(yi)表不受短路電(dian)(dian)(dian)(dian)流(liu)的損害。前者僅(jin)在電(dian)(dian)(dian)(dian)流(liu)大于正常電(dian)(dian)(dian)(dian)流(liu)幾倍或十倍并(bing)且其誤(wu)(wu)差(cha)（電(dian)(dian)(dian)(dian)流(liu)和(he)相位(wei)(wei)誤(wu)(wu)差(cha)）必須在誤(wu)(wu)差(cha)曲線范(fan)圍內時才開始工(gong)作。當同(tong)時評(ping)估電(dian)(dian)(dian)(dian)流(liu)誤(wu)(wu)差(cha)和(he)相位(wei)(wei)差(cha)時，將(jiang)使(shi)用復合(he)誤(wu)(wu)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(chang)家一(yi)開(kai)始的(de)(de)保護是(shi)多個繼電(dian)器具有不同的(de)(de)功能。然后，不同的(de)(de)繼電(dian)器在電(dian)路中發揮各自的(de)(de)保護功能。

負(fu)(fu)荷(he)開(kai)關：負(fu)(fu)荷(he)開(kai)關具有簡(jian)單(dan)(dan)的滅弧(hu)裝置(zhi)。滅弧(hu)介質通(tong)常(chang)(chang)是(shi)空(kong)氣(qi)，它可以產(chan)生并中斷(duan)(duan)某些電(dian)流(liu)和過(guo)電(dian)流(liu)，但(dan)不(bu)(bu)能(neng)中斷(duan)(duan)短(duan)路(lu)電(dian)流(liu)，也不(bu)(bu)能(neng)用(yong)于消除短(duan)路(lu)故障(zhang)。因此，不(bu)(bu)允(yun)許簡(jian)單(dan)(dan)地使(shi)(shi)用(yong)負(fu)(fu)載開(kai)關來替代(dai)斷(duan)(duan)路(lu)器(qi)。如果要使(shi)(shi)用(yong)斷(duan)(duan)路(lu)器(qi)，則必須將它們與上述高壓熔斷(duan)(duan)器(qi)結(jie)合使(shi)(shi)用(yong)（實際上，斷(duan)(duan)路(lu)器(qi)和斷(duan)(duan)路(lu)器(qi)通(tong)常(chang)(chang)串聯(lian)使(shi)(shi)用(yong)，以提供簡(jian)單(dan)(dan)的過(guo)載保護。以降低項目成本）。負(fu)(fu)載開(kai)關類似于隔(ge)離刀，并且有明顯的隔(ge)離間(jian)隙(xi)，很容易(yi)判斷(duan)(duan)電(dian)路(lu)是(shi)打開(kai)還是(shi)關閉。