闡述保護用電(dian)(dian)(dian)(dian)流(liu)(liu)互感(gan)器(qi)(qi)（TA）主要與繼電(dian)(dian)(dian)(dian)保護裝置配合(he)使(shi)用。如(ru)果發(fa)(fa)生短(duan)路或線路過載，它會向繼電(dian)(dian)(dian)(dian)器(qi)(qi)設備發(fa)(fa)出(chu)信號，以切斷故障電(dian)(dian)(dian)(dian)路，以保護電(dian)(dian)(dian)(dian)源系(xi)統的安(an)全。工(gong)作條件與換能(neng)器(qi)(qi)根本不(bu)同。傳感(gan)器(qi)(qi)的正(zheng)常初(chu)級電(dian)(dian)(dian)(dian)流(liu)(liu)工(gong)作范圍相(xiang)當(dang)準確(que)。如(ru)果故障短(duan)路電(dian)(dian)(dian)(dian)流(liu)(liu)通過，則(ze)變(bian)壓(ya)器(qi)(qi)應盡快飽和(he)，以保護儀表不(bu)受短(duan)路電(dian)(dian)(dian)(dian)流(liu)(liu)的損害。前者僅在電(dian)(dian)(dian)(dian)流(liu)(liu)大于正(zheng)常電(dian)(dian)(dian)(dian)流(liu)(liu)幾倍或十倍并且其誤(wu)差（電(dian)(dian)(dian)(dian)流(liu)(liu)和(he)相(xiang)位誤(wu)差）必須在誤(wu)差曲線范圍內(nei)時(shi)才開始(shi)工(gong)作。當(dang)同時(shi)評估電(dian)(dian)(dian)(dian)流(liu)(liu)誤(wu)差和(he)相(xiang)位差時(shi)，將使(shi)用復合(he)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(chan)廠家一開始的(de)保護是(shi)多個繼(ji)電器具有不(bu)同的(de)功能。然后，不(bu)同的(de)繼(ji)電器在電路中發揮各自的(de)保護功能。

負(fu)(fu)荷開(kai)關：負(fu)(fu)荷開(kai)關具有(you)簡單的滅弧(hu)(hu)裝置。滅弧(hu)(hu)介質通(tong)常是空氣，它(ta)可以產生并(bing)中斷(duan)某些電(dian)(dian)(dian)(dian)流和(he)(he)過電(dian)(dian)(dian)(dian)流，但不(bu)能(neng)中斷(duan)短(duan)路(lu)(lu)電(dian)(dian)(dian)(dian)流，也不(bu)能(neng)用(yong)(yong)于消除(chu)短(duan)路(lu)(lu)故障。因此，不(bu)允許簡單地(di)使(shi)用(yong)(yong)負(fu)(fu)載(zai)開(kai)關來替(ti)代斷(duan)路(lu)(lu)器(qi)(qi)(qi)。如果要使(shi)用(yong)(yong)斷(duan)路(lu)(lu)器(qi)(qi)(qi)，則必須將它(ta)們與上述高壓熔斷(duan)器(qi)(qi)(qi)結合使(shi)用(yong)(yong)（實際上，斷(duan)路(lu)(lu)器(qi)(qi)(qi)和(he)(he)斷(duan)路(lu)(lu)器(qi)(qi)(qi)通(tong)常串聯(lian)使(shi)用(yong)(yong)，以提供(gong)簡單的過載(zai)保護。以降低項(xiang)目成本）。負(fu)(fu)載(zai)開(kai)關類(lei)似于隔離刀，并(bing)且有(you)明(ming)顯的隔離間隙，很容易判斷(duan)電(dian)(dian)(dian)(dian)路(lu)(lu)是打開(kai)還是關閉。