的工作原理如下：
1、在(zai)(zai)繼電(dian)器鐵芯(xin)的極(ji)面上(shang)(shang)嵌(qian)有短(duan)路(lu)(lu)環(huan)，使得繼電(dian)器電(dian)流(liu)線(xian)圈所產生的磁通(tong)分(fen)(fen)兩(liang)部(bu)分(fen)(fen)穿過(guo)(guo)圓盤(pan)。當繼電(dian)器的線(xian)圈中有電(dian)流(liu)流(liu)過(guo)(guo)時，鐵芯(xin)中的磁通(tong)分(fen)(fen)成兩(liang)部(bu)分(fen)(fen)，即穿過(guo)(guo)短(duan)路(lu)(lu)環(huan)的部(bu)分(fen)(fen)和未穿過(guo)(guo)短(duan)路(lu)(lu)環(huan)的部(bu)分(fen)(fen)，這兩(liang)個磁通(tong)在(zai)(zai)相位上(shang)(shang)差兀／2，穿過(guo)(guo)夾在(zai)(zai)鐵芯(xin)間隙中的圓盤(pan)的兩(liang)個不同的位置；
2、根(gen)據電(dian)磁(ci)感應的(de)(de)(de)(de)(de)原理(li)，圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)盤(pan)(pan)(pan)在磁(ci)通穿過的(de)(de)(de)(de)(de)部分產生(sheng)渦(wo)(wo)(wo)流(liu)(liu)，從而使(shi)(shi)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)盤(pan)(pan)(pan)在磁(ci)通和渦(wo)(wo)(wo)流(liu)(liu)的(de)(de)(de)(de)(de)相(xiang)互作用(yong)下產生(sheng)旋(xuan)轉(zhuan)力矩(ju)(ju)(ju)（轉(zhuan)矩(ju)(ju)(ju)）。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)盤(pan)(pan)(pan)的(de)(de)(de)(de)(de)轉(zhuan)矩(ju)(ju)(ju)與(yu)電(dian)流(liu)(liu)的(de)(de)(de)(de)(de)平方(fang)成正(zheng)比，圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)盤(pan)(pan)(pan)的(de)(de)(de)(de)(de)旋(xuan)轉(zhuan)速(su)(su)度取決于(yu)轉(zhuan)矩(ju)(ju)(ju)的(de)(de)(de)(de)(de)大(da)(da)小(xiao)。由于(yu)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)盤(pan)(pan)(pan)夾在永久(jiu)(jiu)磁(ci)鐵(tie)的(de)(de)(de)(de)(de)兩(liang)極之間，在圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)盤(pan)(pan)(pan)旋(xuan)轉(zhuan)時(shi)(shi)，同時(shi)(shi)切割(ge)了(le)(le)永久(jiu)(jiu)磁(ci)鐵(tie)的(de)(de)(de)(de)(de)磁(ci)通，所以(yi)在圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)盤(pan)(pan)(pan)中也產生(sheng)渦(wo)(wo)(wo)流(liu)(liu)，這個(ge)渦(wo)(wo)(wo)流(liu)(liu)與(yu)永久(jiu)(jiu)磁(ci)鐵(tie)的(de)(de)(de)(de)(de)磁(ci)通相(xiang)互作用(yong)產生(sheng)了(le)(le)力矩(ju)(ju)(ju)，根(gen)據左手定則可判斷出這個(ge)轉(zhuan)矩(ju)(ju)(ju)恰(qia)恰(qia)與(yu)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)盤(pan)(pan)(pan)的(de)(de)(de)(de)(de)旋(xuan)轉(zhuan)方(fang)向相(xiang)反，對圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)盤(pan)(pan)(pan)的(de)(de)(de)(de)(de)旋(xuan)轉(zhuan)起到(dao)了(le)(le)阻尼作用(yong)，這種作用(yong)稱(cheng)為電(dian)磁(ci)阻尼，阻尼轉(zhuan)矩(ju)(ju)(ju)的(de)(de)(de)(de)(de)大(da)(da)小(xiao)與(yu)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)盤(pan)(pan)(pan)的(de)(de)(de)(de)(de)轉(zhuan)速(su)(su)有關，這樣可使(shi)(shi)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)盤(pan)(pan)(pan)轉(zhuan)速(su)(su)完(wan)全對應于(yu)電(dian)流(liu)(liu)的(de)(de)(de)(de)(de)大(da)(da)小(xiao)而不會自行加速(su)(su)，使(shi)(shi)得圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)盤(pan)(pan)(pan)勻速(su)(su)轉(zhuan)動；
3、當(dang)線圈中通過(guo)(guo)的(de)電流達到繼(ji)電器(qi)整定(ding)電流時(shi)，鋁盤(pan)受(shou)力(li)達到了(le)使(shi)(shi)門(men)型框架足以克服反作用力(li)彈簧的(de)拉(la)力(li)，使(shi)(shi)得扇形(xing)齒(chi)輪與(yu)(yu)圓盤(pan)軸上的(de)螺桿(gan)(gan)嚙合(he)，隨著圓盤(pan)的(de)旋轉，扇形(xing)齒(chi)輪不斷(duan)上升，經過(guo)(guo)一(yi)定(ding)的(de)時(shi)間(jian)，使(shi)(shi)扇形(xing)齒(chi)輪上的(de)挑(tiao)桿(gan)(gan)挑(tiao)起電磁銜(xian)鐵上的(de)杠(gang)桿(gan)(gan)，致使(shi)(shi)銜(xian)鐵與(yu)(yu)鐵芯(xin)間(jian)隙減小而加速吸向鐵芯(xin)，使(shi)(shi)繼(ji)電器(qi)的(de)常開觸點閉(bi)合(he)（或常閉(bi)觸點打開），杠(gang)桿(gan)(gan)同時(shi)把信號牌攤下(xia)表示繼(ji)電器(qi)已經動(dong)作。觸點閉(bi)合(he)后，接通斷(duan)路器(qi)的(de)跳(tiao)閘(zha)回路使(shi)(shi)斷(duan)路囂跳(tiao)閘(zha)；
4、電(dian)(dian)(dian)(dian)流(liu)(liu)繼(ji)(ji)電(dian)(dian)(dian)(dian)器(qi)線圈串接在電(dian)(dian)(dian)(dian)路中，線圈的線徑粗(cu)而匝(za)數少，阻(zu)抗(kang)也(ye)小。電(dian)(dian)(dian)(dian)流(liu)(liu)繼(ji)(ji)電(dian)(dian)(dian)(dian)器(qi)根(gen)據先全(quan)部(bu)中電(dian)(dian)(dian)(dian)流(liu)(liu)的大小而接通或斷(duan)開(kai)電(dian)(dian)(dian)(dian)路，以此反(fan)映電(dian)(dian)(dian)(dian)路中電(dian)(dian)(dian)(dian)流(liu)(liu)的變化。電(dian)(dian)(dian)(dian)流(liu)(liu)繼(ji)(ji)電(dian)(dian)(dian)(dian)器(qi)除用于(yu)電(dian)(dian)(dian)(dian)流(liu)(liu)型(xing)保護的場合外(wai)，還(huan)經常用于(yu)按電(dian)(dian)(dian)(dian)流(liu)(liu)原(yuan)則控制的場合。按吸合電(dian)(dian)(dian)(dian)流(liu)(liu)的大小，電(dian)(dian)(dian)(dian)流(liu)(liu)繼(ji)(ji)電(dian)(dian)(dian)(dian)器(qi)又分(fen)為過電(dian)(dian)(dian)(dian)流(liu)(liu)繼(ji)(ji)電(dian)(dian)(dian)(dian)器(qi)和欠(qian)電(dian)(dian)(dian)(dian)流(liu)(liu)繼(ji)(ji)電(dian)(dian)(dian)(dian)器(qi)，電(dian)(dian)(dian)(dian)流(liu)(liu)繼(ji)(ji)電(dian)(dian)(dian)(dian)器(qi)如圖(tu)所示；
5、過(guo)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)器在電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)工作(zuo)(zuo)正(zheng)常(chang)時不動(dong)(dong)作(zuo)(zuo)，而當電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)超過(guo)某一整(zheng)定值(zhi)時銜鐵才(cai)產(chan)生吸(xi)合(he)動(dong)(dong)作(zuo)(zuo)，帶(dai)動(dong)(dong)觸點(dian)動(dong)(dong)作(zuo)(zuo)。通(tong)常(chang)，交流(liu)(liu)(liu)過(guo)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)器的(de)(de)吸(xi)合(he)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)整(zheng)定范圍(wei)通(tong)常(chang)為(wei)1.1-4倍額定電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，直流(liu)(liu)(liu)過(guo)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)器的(de)(de)吸(xi)合(he)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)整(zheng)定范圍(wei)通(tong)常(chang)為(wei)0.7-3.5倍額定電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)。由于過(guo)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)器在正(zheng)常(chang)情況(kuang)下（即電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)在額定值(zhi)附近）是(shi)釋(shi)放的(de)(de)，只有(you)當電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)發生過(guo)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)時才(cai)動(dong)(dong)作(zuo)(zuo)。
