闡述(shu)保(bao)(bao)(bao)護用電(dian)(dian)(dian)(dian)(dian)流(liu)互感器（TA）主(zhu)要與繼電(dian)(dian)(dian)(dian)(dian)保(bao)(bao)(bao)護裝置配合使用。如果發生短(duan)路或線(xian)路過載，它會向繼電(dian)(dian)(dian)(dian)(dian)器設備發出信號，以(yi)切斷故障(zhang)電(dian)(dian)(dian)(dian)(dian)路，以(yi)保(bao)(bao)(bao)護電(dian)(dian)(dian)(dian)(dian)源系統(tong)的安全。工作(zuo)條件與換能(neng)器根(gen)本(ben)不同。傳感器的正常初級電(dian)(dian)(dian)(dian)(dian)流(liu)工作(zuo)范圍相當(dang)(dang)準確。如果故障(zhang)短(duan)路電(dian)(dian)(dian)(dian)(dian)流(liu)通過，則變壓(ya)器應(ying)盡快(kuai)飽和，以(yi)保(bao)(bao)(bao)護儀(yi)表不受短(duan)路電(dian)(dian)(dian)(dian)(dian)流(liu)的損(sun)害。前者僅在電(dian)(dian)(dian)(dian)(dian)流(liu)大(da)于正常電(dian)(dian)(dian)(dian)(dian)流(liu)幾倍(bei)或十倍(bei)并且其(qi)誤(wu)差（電(dian)(dian)(dian)(dian)(dian)流(liu)和相位(wei)(wei)誤(wu)差）必須在誤(wu)差曲線(xian)范圍內時(shi)(shi)才開始工作(zuo)。當(dang)(dang)同時(shi)(shi)評估(gu)電(dian)(dian)(dian)(dian)(dian)流(liu)誤(wu)差和相位(wei)(wei)差時(shi)(shi)，將使用復合誤(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(sheng)產廠(chang)家(jia)一開始的保護(hu)是多個繼電(dian)器具有(you)不同(tong)的功能。然后，不同(tong)的繼電(dian)器在電(dian)路中(zhong)發(fa)揮各自的保護(hu)功能。

負(fu)(fu)(fu)荷(he)開(kai)關：負(fu)(fu)(fu)荷(he)開(kai)關具有簡單(dan)的(de)滅弧裝置(zhi)。滅弧介(jie)質(zhi)通常是空氣，它(ta)(ta)可以產生并中斷(duan)(duan)某些電(dian)流和(he)過電(dian)流，但(dan)不(bu)能中斷(duan)(duan)短路電(dian)流，也不(bu)能用(yong)(yong)于(yu)消除短路故(gu)障。因此，不(bu)允許(xu)簡單(dan)地使(shi)用(yong)(yong)負(fu)(fu)(fu)載(zai)開(kai)關來替代斷(duan)(duan)路器(qi)(qi)。如果要(yao)使(shi)用(yong)(yong)斷(duan)(duan)路器(qi)(qi)，則必須將它(ta)(ta)們與上(shang)述高壓(ya)熔斷(duan)(duan)器(qi)(qi)結合使(shi)用(yong)(yong)（實際上(shang)，斷(duan)(duan)路器(qi)(qi)和(he)斷(duan)(duan)路器(qi)(qi)通常串聯使(shi)用(yong)(yong)，以提供簡單(dan)的(de)過載(zai)保護。以降低項目成本(ben)）。負(fu)(fu)(fu)載(zai)開(kai)關類(lei)似于(yu)隔離(li)刀，并且有明顯的(de)隔離(li)間隙，很容易(yi)判斷(duan)(duan)電(dian)路是打開(kai)還是關閉。