闡述保(bao)護用電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)互感(gan)器(qi)（TA）主要(yao)與繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)保(bao)護裝置配合使用。如果發生短路(lu)或(huo)線路(lu)過載，它(ta)會(hui)向繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)設備(bei)發出信號，以切斷(duan)故(gu)障電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)，以保(bao)護電(dian)(dian)(dian)(dian)(dian)(dian)源系統的安全。工作(zuo)條件與換能(neng)器(qi)根本不(bu)同(tong)。傳感(gan)器(qi)的正常初級電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)工作(zuo)范圍相當(dang)準(zhun)確。如果故(gu)障短路(lu)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)通過，則(ze)變壓器(qi)應(ying)盡(jin)快飽和，以保(bao)護儀表不(bu)受(shou)短路(lu)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的損害。前者(zhe)僅在電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)大(da)于正常電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)幾倍或(huo)十倍并且其誤(wu)差(cha)（電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)和相位(wei)誤(wu)差(cha)）必須在誤(wu)差(cha)曲線范圍內時才開始工作(zuo)。當(dang)同(tong)時評(ping)估電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)誤(wu)差(cha)和相位(wei)差(cha)時，將使用復合誤(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(chang)家一(yi)開始的(de)保護(hu)是(shi)多個(ge)繼電(dian)(dian)器(qi)(qi)具有不同的(de)功能。然后，不同的(de)繼電(dian)(dian)器(qi)(qi)在電(dian)(dian)路(lu)中(zhong)發揮各自的(de)保護(hu)功能。

負(fu)(fu)(fu)荷開關：負(fu)(fu)(fu)荷開關具有簡單的(de)滅(mie)弧裝置。滅(mie)弧介質(zhi)通(tong)(tong)常是(shi)(shi)空氣，它可(ke)以產生并(bing)中斷(duan)(duan)某些電流(liu)(liu)和過(guo)電流(liu)(liu)，但不能中斷(duan)(duan)短路(lu)(lu)(lu)電流(liu)(liu)，也不能用(yong)于(yu)消除(chu)短路(lu)(lu)(lu)故(gu)障。因此，不允許簡單地使(shi)用(yong)負(fu)(fu)(fu)載(zai)開關來(lai)替(ti)代(dai)斷(duan)(duan)路(lu)(lu)(lu)器(qi)。如(ru)果要使(shi)用(yong)斷(duan)(duan)路(lu)(lu)(lu)器(qi)，則必須(xu)將它們(men)與(yu)上述高(gao)壓熔斷(duan)(duan)器(qi)結(jie)合(he)使(shi)用(yong)（實(shi)際上，斷(duan)(duan)路(lu)(lu)(lu)器(qi)和斷(duan)(duan)路(lu)(lu)(lu)器(qi)通(tong)(tong)常串聯(lian)使(shi)用(yong)，以提供簡單的(de)過(guo)載(zai)保護。以降(jiang)低(di)項目成本）。負(fu)(fu)(fu)載(zai)開關類似(si)于(yu)隔(ge)離刀(dao)，并(bing)且(qie)有明顯的(de)隔(ge)離間隙，很容易(yi)判斷(duan)(duan)電路(lu)(lu)(lu)是(shi)(shi)打開還是(shi)(shi)關閉。