闡(chan)述(shu)保(bao)護用(yong)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)互感(gan)器(qi)(qi)（TA）主(zhu)要與繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)保(bao)護裝置配合使用(yong)。如果(guo)發(fa)生短路或線(xian)路過(guo)載，它(ta)會向(xiang)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)設備發(fa)出信號，以切斷故(gu)障電(dian)(dian)(dian)(dian)(dian)路，以保(bao)護電(dian)(dian)(dian)(dian)(dian)源系統的安全(quan)。工(gong)作(zuo)(zuo)條件與換(huan)能器(qi)(qi)根本不同。傳(chuan)感(gan)器(qi)(qi)的正(zheng)常初級電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)工(gong)作(zuo)(zuo)范圍相當準確。如果(guo)故(gu)障短路電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)通(tong)過(guo)，則變壓器(qi)(qi)應盡快飽和(he)，以保(bao)護儀表(biao)不受(shou)短路電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的損(sun)害(hai)。前者僅在電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)大于(yu)正(zheng)常電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)幾(ji)倍或十(shi)倍并且其誤(wu)(wu)差（電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)和(he)相位(wei)(wei)誤(wu)(wu)差）必(bi)須(xu)在誤(wu)(wu)差曲線(xian)范圍內(nei)時(shi)才開始(shi)工(gong)作(zuo)(zuo)。當同時(shi)評估電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)誤(wu)(wu)差和(he)相位(wei)(wei)差時(shi)，將使用(yong)復合誤(wu)(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(sheng)產(chan)廠家一開始的(de)(de)保護是多個繼(ji)電(dian)器具有不(bu)同的(de)(de)功能(neng)。然后，不(bu)同的(de)(de)繼(ji)電(dian)器在電(dian)路中發揮(hui)各自的(de)(de)保護功能(neng)。

負荷(he)開關(guan)：負荷(he)開關(guan)具有簡單(dan)的(de)滅弧裝置(zhi)。滅弧介質(zhi)通(tong)(tong)常(chang)是(shi)空(kong)氣(qi)，它(ta)可以(yi)產(chan)生并中斷(duan)(duan)某些電流和過(guo)電流，但不能中斷(duan)(duan)短(duan)路(lu)電流，也不能用(yong)于(yu)消(xiao)除短(duan)路(lu)故障。因此，不允許簡單(dan)地使(shi)用(yong)負載開關(guan)來替代斷(duan)(duan)路(lu)器。如(ru)果要使(shi)用(yong)斷(duan)(duan)路(lu)器，則必須(xu)將它(ta)們與上(shang)述(shu)高壓熔斷(duan)(duan)器結(jie)合(he)使(shi)用(yong)（實際上(shang)，斷(duan)(duan)路(lu)器和斷(duan)(duan)路(lu)器通(tong)(tong)常(chang)串聯使(shi)用(yong)，以(yi)提(ti)供簡單(dan)的(de)過(guo)載保護。以(yi)降低項(xiang)目成本）。負載開關(guan)類(lei)似于(yu)隔(ge)離刀，并且有明顯的(de)隔(ge)離間隙，很(hen)容易(yi)判斷(duan)(duan)電路(lu)是(shi)打開還是(shi)關(guan)閉。