闡述保護用(yong)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)互感(gan)器(qi)（TA）主要與繼電(dian)(dian)(dian)(dian)(dian)(dian)保護裝置配合(he)使(shi)用(yong)。如果(guo)發生短(duan)路或線路過(guo)(guo)載，它會向繼電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)設備發出信(xin)號，以切斷故障電(dian)(dian)(dian)(dian)(dian)(dian)路，以保護電(dian)(dian)(dian)(dian)(dian)(dian)源系統的安(an)全。工作(zuo)條件與換能(neng)器(qi)根本(ben)不(bu)同(tong)。傳感(gan)器(qi)的正(zheng)常初級電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)工作(zuo)范圍相當(dang)準確。如果(guo)故障短(duan)路電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)通過(guo)(guo)，則(ze)變壓器(qi)應盡快飽和，以保護儀表不(bu)受短(duan)路電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)的損害。前者僅在電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)大于正(zheng)常電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)幾倍(bei)或十倍(bei)并且其誤(wu)差(cha)（電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)和相位(wei)(wei)誤(wu)差(cha)）必須在誤(wu)差(cha)曲線范圍內時(shi)才開始(shi)工作(zuo)。當(dang)同(tong)時(shi)評估電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)誤(wu)差(cha)和相位(wei)(wei)差(cha)時(shi)，將使(shi)用(yong)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）。生產廠家一(yi)開始的保護是多個繼電(dian)器(qi)具有(you)不(bu)同(tong)的功(gong)(gong)能(neng)。然后，不(bu)同(tong)的繼電(dian)器(qi)在電(dian)路(lu)中發揮各自的保護功(gong)(gong)能(neng)。

負(fu)(fu)荷(he)(he)開(kai)關(guan)：負(fu)(fu)荷(he)(he)開(kai)關(guan)具有簡(jian)(jian)單(dan)的滅弧(hu)裝置(zhi)。滅弧(hu)介(jie)質通常(chang)是(shi)(shi)空氣，它可以產生并(bing)中斷(duan)(duan)某(mou)些電流(liu)(liu)和過電流(liu)(liu)，但不(bu)能中斷(duan)(duan)短路電流(liu)(liu)，也不(bu)能用(yong)于消除短路故(gu)障(zhang)。因此(ci)，不(bu)允許簡(jian)(jian)單(dan)地使用(yong)負(fu)(fu)載(zai)開(kai)關(guan)來替代斷(duan)(duan)路器。如果要使用(yong)斷(duan)(duan)路器，則必須將(jiang)它們與上述高壓熔斷(duan)(duan)器結(jie)合(he)使用(yong)（實際上，斷(duan)(duan)路器和斷(duan)(duan)路器通常(chang)串聯使用(yong)，以提供簡(jian)(jian)單(dan)的過載(zai)保護。以降低項目成本）。負(fu)(fu)載(zai)開(kai)關(guan)類似于隔離刀，并(bing)且有明顯的隔離間(jian)隙(xi)，很容易(yi)判(pan)斷(duan)(duan)電路是(shi)(shi)打開(kai)還是(shi)(shi)關(guan)閉。