闡述保護用(yong)電(dian)(dian)(dian)(dian)流(liu)(liu)互感器(qi)（TA）主要與(yu)繼電(dian)(dian)(dian)(dian)保護裝置(zhi)配合使用(yong)。如果發生短(duan)路(lu)(lu)或(huo)線路(lu)(lu)過(guo)載，它會向繼電(dian)(dian)(dian)(dian)器(qi)設備發出信(xin)號(hao)，以切斷(duan)故(gu)障電(dian)(dian)(dian)(dian)路(lu)(lu)，以保護電(dian)(dian)(dian)(dian)源系統的安全。工(gong)(gong)作(zuo)條件與(yu)換能(neng)器(qi)根本(ben)不同(tong)。傳感器(qi)的正常初級電(dian)(dian)(dian)(dian)流(liu)(liu)工(gong)(gong)作(zuo)范(fan)圍(wei)相當(dang)準(zhun)確。如果故(gu)障短(duan)路(lu)(lu)電(dian)(dian)(dian)(dian)流(liu)(liu)通過(guo)，則變(bian)壓(ya)器(qi)應盡(jin)快飽和，以保護儀表(biao)不受(shou)短(duan)路(lu)(lu)電(dian)(dian)(dian)(dian)流(liu)(liu)的損(sun)害(hai)。前者(zhe)僅在電(dian)(dian)(dian)(dian)流(liu)(liu)大于(yu)正常電(dian)(dian)(dian)(dian)流(liu)(liu)幾倍或(huo)十倍并且(qie)其誤(wu)(wu)差（電(dian)(dian)(dian)(dian)流(liu)(liu)和相位(wei)誤(wu)(wu)差）必須在誤(wu)(wu)差曲線范(fan)圍(wei)內時才(cai)開始工(gong)(gong)作(zuo)。當(dang)同(tong)時評估電(dian)(dian)(dian)(dian)流(liu)(liu)誤(wu)(wu)差和相位(wei)差時，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）。生產廠家一開(kai)始(shi)的保(bao)護是多個繼(ji)電器具有不(bu)(bu)同的功能。然后，不(bu)(bu)同的繼(ji)電器在(zai)電路中發揮(hui)各自的保(bao)護功能。

負(fu)荷開(kai)(kai)(kai)關(guan)(guan)：負(fu)荷開(kai)(kai)(kai)關(guan)(guan)具有(you)簡單(dan)的(de)滅弧裝置。滅弧介質通(tong)常(chang)是(shi)空氣(qi)，它可以(yi)(yi)產生并(bing)中(zhong)(zhong)斷(duan)(duan)某(mou)些電(dian)(dian)流和過(guo)(guo)電(dian)(dian)流，但(dan)不能中(zhong)(zhong)斷(duan)(duan)短路電(dian)(dian)流，也不能用(yong)(yong)(yong)于(yu)消除短路故障。因此，不允(yun)許簡單(dan)地使用(yong)(yong)(yong)負(fu)載開(kai)(kai)(kai)關(guan)(guan)來替(ti)代斷(duan)(duan)路器(qi)。如果要使用(yong)(yong)(yong)斷(duan)(duan)路器(qi)，則必須將它們與上(shang)(shang)述高壓熔斷(duan)(duan)器(qi)結合使用(yong)(yong)(yong)（實(shi)際上(shang)(shang)，斷(duan)(duan)路器(qi)和斷(duan)(duan)路器(qi)通(tong)常(chang)串聯使用(yong)(yong)(yong)，以(yi)(yi)提供簡單(dan)的(de)過(guo)(guo)載保護。以(yi)(yi)降低項(xiang)目成本）。負(fu)載開(kai)(kai)(kai)關(guan)(guan)類似(si)于(yu)隔(ge)離刀(dao)，并(bing)且有(you)明顯的(de)隔(ge)離間隙(xi)，很容易判斷(duan)(duan)電(dian)(dian)路是(shi)打開(kai)(kai)(kai)還是(shi)關(guan)(guan)閉。