闡述保護(hu)(hu)用電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)互感(gan)器(qi)(qi)(qi)（TA）主要與繼電(dian)(dian)(dian)(dian)(dian)保護(hu)(hu)裝置配合(he)使用。如果(guo)發(fa)生短路(lu)(lu)或線(xian)路(lu)(lu)過載，它(ta)會向繼電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)設備發(fa)出信號，以切斷故障電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)，以保護(hu)(hu)電(dian)(dian)(dian)(dian)(dian)源系統(tong)的安全。工(gong)作(zuo)(zuo)條(tiao)件與換能器(qi)(qi)(qi)根本(ben)不(bu)同(tong)。傳(chuan)感(gan)器(qi)(qi)(qi)的正(zheng)常初級電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)工(gong)作(zuo)(zuo)范(fan)(fan)圍相(xiang)當準確。如果(guo)故障短路(lu)(lu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)通過，則(ze)變壓(ya)器(qi)(qi)(qi)應(ying)盡快飽和(he)，以保護(hu)(hu)儀表不(bu)受短路(lu)(lu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的損害。前者僅在(zai)(zai)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)大于正(zheng)常電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)幾倍或十倍并且其誤(wu)差(cha)（電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)和(he)相(xiang)位誤(wu)差(cha)）必(bi)須在(zai)(zai)誤(wu)差(cha)曲線(xian)范(fan)(fan)圍內時(shi)才開始工(gong)作(zuo)(zuo)。當同(tong)時(shi)評(ping)估(gu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)誤(wu)差(cha)和(he)相(xiang)位差(cha)時(shi)，將使用復合(he)誤(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）。生產廠家(jia)一開(kai)始(shi)的(de)(de)保(bao)(bao)護(hu)是多個繼電(dian)(dian)器具有(you)不同的(de)(de)功能。然(ran)后，不同的(de)(de)繼電(dian)(dian)器在電(dian)(dian)路中發(fa)揮(hui)各自的(de)(de)保(bao)(bao)護(hu)功能。

負(fu)(fu)荷開關(guan)(guan)：負(fu)(fu)荷開關(guan)(guan)具有簡(jian)單(dan)的(de)滅弧裝(zhuang)置。滅弧介質(zhi)通(tong)常(chang)是(shi)空氣(qi)，它(ta)可以(yi)產生(sheng)并(bing)中(zhong)斷(duan)某些電(dian)流和過(guo)電(dian)流，但不(bu)能中(zhong)斷(duan)短(duan)路(lu)電(dian)流，也不(bu)能用于(yu)消除短(duan)路(lu)故障。因此，不(bu)允許(xu)簡(jian)單(dan)地使(shi)用負(fu)(fu)載(zai)開關(guan)(guan)來替(ti)代斷(duan)路(lu)器。如(ru)果要(yao)使(shi)用斷(duan)路(lu)器，則必須(xu)將它(ta)們與上(shang)(shang)述(shu)高壓熔斷(duan)器結合(he)使(shi)用（實際上(shang)(shang)，斷(duan)路(lu)器和斷(duan)路(lu)器通(tong)常(chang)串(chuan)聯使(shi)用，以(yi)提供簡(jian)單(dan)的(de)過(guo)載(zai)保(bao)護(hu)。以(yi)降(jiang)低項目成本）。負(fu)(fu)載(zai)開關(guan)(guan)類似于(yu)隔(ge)離(li)刀，并(bing)且有明(ming)顯的(de)隔(ge)離(li)間隙(xi)，很容易判(pan)斷(duan)電(dian)路(lu)是(shi)打開還是(shi)關(guan)(guan)閉。