闡述保護用電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)互感(gan)器(qi)(qi)(qi)(qi)（TA）主要與繼電(dian)(dian)(dian)(dian)(dian)保護裝(zhuang)置配(pei)合使用。如(ru)果發生短路(lu)或(huo)線(xian)路(lu)過載，它會(hui)向繼電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)設(she)備(bei)發出信號，以(yi)切斷故(gu)障電(dian)(dian)(dian)(dian)(dian)路(lu)，以(yi)保護電(dian)(dian)(dian)(dian)(dian)源系統(tong)的(de)(de)安(an)全。工(gong)作(zuo)條件與換能器(qi)(qi)(qi)(qi)根本(ben)不同。傳感(gan)器(qi)(qi)(qi)(qi)的(de)(de)正常初級電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)工(gong)作(zuo)范(fan)圍相當(dang)準確。如(ru)果故(gu)障短路(lu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)通(tong)過，則變(bian)壓(ya)器(qi)(qi)(qi)(qi)應盡快飽和，以(yi)保護儀表不受短路(lu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)的(de)(de)損害。前者僅在電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)大于正常電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)幾倍或(huo)十倍并(bing)且其誤(wu)(wu)差(cha)（電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)和相位誤(wu)(wu)差(cha)）必(bi)須(xu)在誤(wu)(wu)差(cha)曲線(xian)范(fan)圍內時才開始工(gong)作(zuo)。當(dang)同時評估(gu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)誤(wu)(wu)差(cha)和相位差(cha)時，將使用復(fu)合誤(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)家一開始的(de)保護是多(duo)個繼(ji)電器(qi)具(ju)有(you)不(bu)同(tong)的(de)功(gong)能(neng)。然后，不(bu)同(tong)的(de)繼(ji)電器(qi)在電路中發揮(hui)各自的(de)保護功(gong)能(neng)。

負荷開關(guan)(guan)：負荷開關(guan)(guan)具有簡(jian)單的滅弧裝置。滅弧介質通(tong)常(chang)(chang)是(shi)(shi)空氣，它可以(yi)(yi)產生(sheng)并(bing)中斷某些電(dian)(dian)流和過(guo)電(dian)(dian)流，但不能(neng)(neng)中斷短路(lu)電(dian)(dian)流，也不能(neng)(neng)用(yong)于消(xiao)除短路(lu)故(gu)障(zhang)。因此，不允(yun)許簡(jian)單地使(shi)用(yong)負載(zai)開關(guan)(guan)來(lai)替代斷路(lu)器(qi)(qi)。如果要使(shi)用(yong)斷路(lu)器(qi)(qi)，則必須(xu)將它們與(yu)上述(shu)高壓熔(rong)斷器(qi)(qi)結合使(shi)用(yong)（實際上，斷路(lu)器(qi)(qi)和斷路(lu)器(qi)(qi)通(tong)常(chang)(chang)串聯(lian)使(shi)用(yong)，以(yi)(yi)提供簡(jian)單的過(guo)載(zai)保護。以(yi)(yi)降低項目成(cheng)本(ben)）。負載(zai)開關(guan)(guan)類似于隔(ge)離刀，并(bing)且有明顯的隔(ge)離間隙(xi)，很容易(yi)判斷電(dian)(dian)路(lu)是(shi)(shi)打開還(huan)是(shi)(shi)關(guan)(guan)閉。