闡述保(bao)護用電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)互感器(qi)（TA）主要與繼(ji)電(dian)(dian)(dian)(dian)(dian)保(bao)護裝(zhuang)置(zhi)配合使(shi)用。如(ru)果(guo)發(fa)生短路(lu)(lu)或線路(lu)(lu)過載，它會向繼(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)設備(bei)發(fa)出信號(hao)，以切(qie)斷(duan)故(gu)(gu)障(zhang)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)，以保(bao)護電(dian)(dian)(dian)(dian)(dian)源系統的安全。工作(zuo)條件(jian)與換能(neng)器(qi)根本不(bu)同。傳感器(qi)的正(zheng)常(chang)初級電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)工作(zuo)范圍(wei)相當(dang)準確。如(ru)果(guo)故(gu)(gu)障(zhang)短路(lu)(lu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)通(tong)過，則變壓器(qi)應盡快飽和，以保(bao)護儀(yi)表不(bu)受短路(lu)(lu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的損害。前(qian)者僅在電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)大于正(zheng)常(chang)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)幾(ji)倍(bei)或十倍(bei)并且其誤(wu)差(cha)(cha)（電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)和相位(wei)誤(wu)差(cha)(cha)）必須在誤(wu)差(cha)(cha)曲線范圍(wei)內時(shi)才開(kai)始(shi)工作(zuo)。當(dang)同時(shi)評估(gu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)誤(wu)差(cha)(cha)和相位(wei)差(cha)(cha)時(shi)，將(jiang)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）。生產廠家一開始的保(bao)護(hu)是多個繼電(dian)器具有不同的功能。然(ran)后，不同的繼電(dian)器在(zai)電(dian)路中(zhong)發揮(hui)各自的保(bao)護(hu)功能。

負(fu)(fu)荷開(kai)關(guan)：負(fu)(fu)荷開(kai)關(guan)具有(you)簡單的(de)滅弧裝(zhuang)置(zhi)。滅弧介(jie)質(zhi)通常是(shi)空氣，它(ta)可以(yi)產(chan)生并(bing)中(zhong)斷(duan)(duan)某些(xie)電流和過(guo)電流，但不(bu)能中(zhong)斷(duan)(duan)短(duan)路(lu)(lu)電流，也不(bu)能用(yong)于消除短(duan)路(lu)(lu)故(gu)障。因此(ci)，不(bu)允(yun)許簡單地使(shi)(shi)用(yong)負(fu)(fu)載開(kai)關(guan)來替代斷(duan)(duan)路(lu)(lu)器。如果要(yao)使(shi)(shi)用(yong)斷(duan)(duan)路(lu)(lu)器，則必須將它(ta)們與上述高壓熔(rong)斷(duan)(duan)器結合使(shi)(shi)用(yong)（實際上，斷(duan)(duan)路(lu)(lu)器和斷(duan)(duan)路(lu)(lu)器通常串(chuan)聯(lian)使(shi)(shi)用(yong)，以(yi)提(ti)供(gong)簡單的(de)過(guo)載保護。以(yi)降低項目(mu)成本）。負(fu)(fu)載開(kai)關(guan)類似于隔(ge)離刀(dao)，并(bing)且有(you)明顯的(de)隔(ge)離間隙，很容(rong)易判斷(duan)(duan)電路(lu)(lu)是(shi)打開(kai)還是(shi)關(guan)閉。