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        電動機保護器種類很多，推薦一種上海碩吉JD-5S電動機綜合保護器及(ji)接線方式，220/380可選。

電動機缺相保護器工作原理和接線圖

    保護器在斷電狀態下(xia)，NC與CO是通的。通電后，電動機工作正常時保持接通，當檢測到電動機出現故障時，繼電器斷開，切斷電動機電源。
      缺相(xiang)(xiang)(xiang)就是三(san)相(xiang)(xiang)(xiang)電(dian)(dian)(dian)(dian)源(yuan)(yuan)供(gong)電(dian)(dian)(dian)(dian)，實際到(dao)的不是三(san)相(xiang)(xiang)(xiang)，而是兩(liang)相(xiang)(xiang)(xiang)或只有一(yi)相(xiang)(xiang)(xiang)電(dian)(dian)(dian)(dian)。三(san)相(xiang)(xiang)(xiang)電(dian)(dian)(dian)(dian)機(ji)電(dian)(dian)(dian)(dian)源(yuan)(yuan)缺相(xiang)(xiang)(xiang)后(hou)電(dian)(dian)(dian)(dian)機(ji)無法(fa)正常工作(zuo)，長時(shi)間缺一(yi)相(xiang)(xiang)(xiang)電(dian)(dian)(dian)(dian)會燒壞電(dian)(dian)(dian)(dian)機(ji)線圈繞組(zu)，使(shi)用三(san)相(xiang)(xiang)(xiang)380V電(dian)(dian)(dian)(dian)源(yuan)(yuan)變220V控制電(dian)(dian)(dian)(dian)源(yuan)(yuan)，會因為缺相(xiang)(xiang)(xiang)沒有220V電(dian)(dian)(dian)(dian)壓(ya)(ya)。可(ke)以使(shi)用萬用表測量三(san)相(xiang)(xiang)(xiang)電(dian)(dian)(dian)(dian)源(yuan)(yuan)相(xiang)(xiang)(xiang)間電(dian)(dian)(dian)(dian)壓(ya)(ya)，如果不都(dou)是380V左右，說(shuo)明電(dian)(dian)(dian)(dian)源(yuan)(yuan)缺相(xiang)(xiang)(xiang)。

電流檢測

    電(dian)(dian)動(dong)機保護器(qi)(qi)通(tong)過內置(zhi)的(de)(de)電(dian)(dian)流互(hu)(hu)感器(qi)(qi)來檢(jian)測三相負載電(dian)(dian)流，所以被保護電(dian)(dian)動(dong)機的(de)(de)三根相線(xian)必(bi)須分別穿過電(dian)(dian)流互(hu)(hu)感器(qi)(qi)的(de)(de)三個小孔

??????過載保護

    當負載電(dian)(dian)流超(chao)過整定電(dian)(dian)流，并且(qie)持續時(shi)間達到設定的(de)過載動作時(shi)間時(shi)，繼(ji)電(dian)(dian)器斷(duan)開，切(qie)斷(duan)電(dian)(dian)動機電(dian)(dian)源。

智能(neng)啟動識別(bie)

    為防止電機啟動時產生誤動作(zuo)，本(ben)產品具(ju)有智能(neng)啟動識(shi)別功能(neng)，當(dang)識(shi)別到電動機處于啟動狀態時，過載動作(zuo)時間加倍。

缺相(xiang)保(bao)護

    當(dang)電(dian)(dian)動(dong)機(ji)(ji)發生缺(que)相故障(zhang)時(shi)，繼電(dian)(dian)器斷(duan)開(kai)，切斷(duan)電(dian)(dian)動(dong)機(ji)(ji)電(dian)(dian)源。為防止空載和(he)小電(dian)(dian)流時(shi)誤動(dong)作，電(dian)(dian)流小于2A時關閉缺相檢測。

相(xiang)關閱讀：

●熱過載繼電器配合接觸器怎么接線

●電機綜合保護器接線圖(電機保護裝置和星三角啟動裝置線路圖)

●三相交流電機缺相保護器接線圖及工作原理

●電動機保護器原理和接線圖