繼(ji)(ji)電(dian)(dian)器(qi)相(xiang)信大家肯(ken)定(ding)都不陌生，是一種(zhong)控制器(qi)件(jian)，通(tong)常作為控制開關使(shi)用(yong)與(yu)電(dian)(dian)路中(zhong)，通(tong)過電(dian)(dian)磁轉(zhuan)換來達到(dao)控制電(dian)(dian)路通(tong)斷(duan)的(de)目(mu)的(de)，外(wai)觀(guan)多(duo)(duo)種(zhong)多(duo)(duo)樣(yang)，但原理相(xiang)同，繼(ji)(ji)電(dian)(dian)器(qi)可用(yong)于各種(zhong)各樣(yang)的(de)電(dian)(dian)路，實現開關，轉(zhuan)換，延(yan)遲功能，但作為漏電(dian)(dian)保(bao)護器(qi)件(jian)用(yong)應在電(dian)(dian)路中(zhong)卻不多(duo)(duo)見，下面(mian)就來分(fen)享一下，在變電(dian)(dian)系(xi)統中(zhong)，繼(ji)(ji)電(dian)(dian)器(qi)如(ru)何作為保(bao)護電(dian)(dian)器(qi)件(jian)使(shi)用(yong)在電(dian)(dian)路中(zhong)的(de)，如(ru)圖(tu)：
圖中的電(dian)源變壓器輸出三相交流電(dian)，供(gong)后(hou)級電(dian)器設(she)備(bei)使用，FU1、FU2為過電(dian)流熔斷保護器。
主電路的(de)通斷控(kong)制(zhi)器件為交(jiao)流(liu)接觸器KM，常態(tai)(tai)下，SB2為常閉(bi)狀態(tai)(tai)，繼電器也為常閉(bi)狀態(tai)(tai)。
按下SB1，KM接(jie)通(tong)，于是KM_2觸點接(jie)通(tong)，開始給后級電(dian)路(lu)供電(dian)，因為KM_1為KM自鎖觸點，所以(yi)松(song)開啟動(dong)鍵電(dian)路(lu)仍能保持接(jie)通(tong)。
但是，如果下級電(dian)(dian)器(qi)設(she)備(bei)出現漏電(dian)(dian)情況(kuang)，三相變壓器(qi)繞組中性端N則有(you)電(dian)(dian)壓輸出，繼(ji)電(dian)(dian)器(qi)KA得(de)電(dian)(dian)動作，KA_1常閉觸(chu)點(dian)斷(duan)開，切斷(duan)接(jie)觸(chu)器(qi)線圈(quan)供電(dian)(dian)，接(jie)觸(chu)器(qi)KM復(fu)位，KM_1，KM_2斷(duan)開，從而(er)實現了(le)對下級電(dian)(dian)路的斷(duan)電(dian)(dian)保護，只有(you)排(pai)除后級電(dian)(dian)路的漏電(dian)(dian)故障，才能實現再次啟動再次送電(dian)(dian)。
