闡述保(bao)護(hu)(hu)用電(dian)(dian)(dian)(dian)(dian)(dian)流互(hu)感器(qi)（TA）主要與繼電(dian)(dian)(dian)(dian)(dian)(dian)保(bao)護(hu)(hu)裝置配合(he)使用。如果(guo)發生短(duan)路或(huo)線路過載(zai)，它(ta)會向(xiang)繼電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)設(she)備發出信號，以切斷故(gu)(gu)障電(dian)(dian)(dian)(dian)(dian)(dian)路，以保(bao)護(hu)(hu)電(dian)(dian)(dian)(dian)(dian)(dian)源系統的安全。工作(zuo)條件與換能器(qi)根(gen)本不(bu)同。傳(chuan)感器(qi)的正常初(chu)級電(dian)(dian)(dian)(dian)(dian)(dian)流工作(zuo)范圍相當準確。如果(guo)故(gu)(gu)障短(duan)路電(dian)(dian)(dian)(dian)(dian)(dian)流通過，則變壓(ya)器(qi)應(ying)盡快飽和(he)，以保(bao)護(hu)(hu)儀表不(bu)受短(duan)路電(dian)(dian)(dian)(dian)(dian)(dian)流的損(sun)害(hai)。前者僅在電(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(cha)(cha)（電(dian)(dian)(dian)(dian)(dian)(dian)流和(he)相位誤(wu)差(cha)(cha)）必須在誤(wu)差(cha)(cha)曲線范圍內(nei)時(shi)才(cai)開始工作(zuo)。當同時(shi)評估電(dian)(dian)(dian)(dian)(dian)(dian)流誤(wu)差(cha)(cha)和(he)相位差(cha)(cha)時(shi)，將使用復(fu)合(he)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(jia)一開始(shi)的(de)(de)保護是多(duo)個繼(ji)電(dian)器具有不同的(de)(de)功能。然后，不同的(de)(de)繼(ji)電(dian)器在(zai)電(dian)路中發揮(hui)各自的(de)(de)保護功能。

負(fu)荷開(kai)關(guan)(guan)：負(fu)荷開(kai)關(guan)(guan)具有簡單的滅(mie)弧(hu)(hu)裝置。滅(mie)弧(hu)(hu)介質通常(chang)是(shi)空氣，它可以(yi)產生(sheng)并(bing)中斷(duan)(duan)某些電(dian)流和過電(dian)流，但不能中斷(duan)(duan)短(duan)路電(dian)流，也不能用(yong)(yong)于(yu)消除短(duan)路故障。因此(ci)，不允許簡單地(di)使(shi)用(yong)(yong)負(fu)載開(kai)關(guan)(guan)來替代斷(duan)(duan)路器(qi)。如果要使(shi)用(yong)(yong)斷(duan)(duan)路器(qi)，則(ze)必須將它們與上述高壓(ya)熔斷(duan)(duan)器(qi)結合使(shi)用(yong)(yong)（實際上，斷(duan)(duan)路器(qi)和斷(duan)(duan)路器(qi)通常(chang)串聯使(shi)用(yong)(yong)，以(yi)提供簡單的過載保(bao)護。以(yi)降低項目成(cheng)本）。負(fu)載開(kai)關(guan)(guan)類似于(yu)隔離刀，并(bing)且(qie)有明顯的隔離間(jian)隙，很容易判(pan)斷(duan)(duan)電(dian)路是(shi)打(da)開(kai)還(huan)是(shi)關(guan)(guan)閉(bi)。