電動機缺相保護有以下三種解決方案:
1、3個繼(ji)電器(qi)或(huo)接zhi觸(chu)器(qi)的線圈Y0接,監(jian)視(shi)3相(xiang)的相(xiang)電壓。3個繼(ji)電器(qi)的常(chang)開觸(chu)點串聯(lian)后再串聯(lian)進電動(dong)機(ji)的接觸(chu)器(qi)線圈回(hui)路(lu)里。如(ru)果3相(xiang)電都(dou)正常(chang)的話,3個繼(ji)電器(qi)都(dou)吸(xi)合,3個常(chang)開觸(chu)點都(dou)閉(bi)合,電動(dong)機(ji)的接觸(chu)器(qi)線圈回(hui)路(lu)可以正常(chang)工作(zuo)。
但(dan)如果(guo)電(dian)(dian)源(yuan)缺相,必然至少有(you)1個繼電(dian)(dian)器不(bu)吸(xi)(xi)合,電(dian)(dian)動(dong)機的接觸器線圈回(hui)路被(bei)斷(duan)開,接觸器無(wu)法吸(xi)(xi)合,或被(bei)強行斷(duan)開,起到斷(duan)相保護功能。
2、目前國內有很多(duo)種專門的斷相保護繼(ji)電器,原理與上述差不多(duo),可以簡化接線,少(shao)占(zhan)用控制柜的空間。
3、使用電(dian)動機智能保(bao)護(hu)器,體(ti)積小,功能多,不(bu)只斷相保(bao)護(hu),還可以有速斷保(bao)護(hu)、過(guo)流(liu)保(bao)護(hu)、啟(qi)動時間過(guo)長保(bao)護(hu)、不(bu)平衡電(dian)流(liu)保(bao)護(hu)等(deng)。這種產品也很(hen)多,價格(ge)也不(bu)貴。
擴展資料:
檢測(ce)電壓來控(kong)制的可(ke)以稱呼為三相(xiang)(xiang)電源(yuan)監視器(qi)、相(xiang)(xiang)序保護器(qi)、過欠壓保護器(qi)等,主要(yao)用于交流50/60Hz,額定電壓460V以下,工(gong)業三相(xiang)(xiang)220V、380V、440V、460V等電壓級(ji)別的各種故(gu)障檢測(ce)。
對三相(xiang)輸入電(dian)(dian)源的(de)電(dian)(dian)壓(ya)過高、電(dian)(dian)壓(ya)過低、缺(que)相(xiang)、斷相(xiang)、逆(ni)相(xiang)(相(xiang)序)、三相(xiang)電(dian)(dian)壓(ya)不平衡等提供繼電(dian)(dian)保護(hu),產品廣泛應(ying)用于配(pei)電(dian)(dian)箱、中央(yang)空調機(ji)組、電(dian)(dian)控箱、配(pei)電(dian)(dian)柜、起重機(ji)等,如中央(yang)空調壓(ya)縮機(ji)保護(hu),各(ge)種電(dian)(dian)梯的(de)電(dian)(dian)源監視,水泵、油泵防缺(que)相(xiang)、逆(ni)相(xiang)保護(hu)等。
檢測電(dian)(dian)(dian)流(liu)來控(kong)制的可以稱呼為(wei)斷相繼電(dian)(dian)(dian)器,過載繼電(dian)(dian)(dian)器,過流(liu)保(bao)護繼電(dian)(dian)(dian)器等,根據功能又(you)可稱呼電(dian)(dian)(dian)機(ji)保(bao)護器,壓縮(suo)機(ji)保(bao)護器等,用(yong)于交流(liu)45~60Hz,電(dian)(dian)(dian)壓24V至380V的供電(dian)(dian)(dian)電(dian)(dian)(dian)路中與交流(liu)接觸器等開關(guan)電(dian)(dian)(dian)器組(zu)成(cheng)電(dian)(dian)(dian)動機(ji)的控(kong)制電(dian)(dian)(dian)路。
當電(dian)動機的主電(dian)路出(chu)(chu)現斷(duan)相(xiang)、過載、三(san)(san)相(xiang)不平(ping)衡等非正常工(gong)作(zuo)狀態時(shi),保護器(qi)能夠(gou)及時(shi)分斷(duan)開(kai)關電(dian)器(qi)的觸(chu)頭(tou),斷(duan)開(kai)電(dian)動機的三(san)(san)相(xiang)電(dian)源,快速可(ke)靠(kao)地保護電(dian)動機。保護器(qi)采用穿芯式(shi)電(dian)流(liu)取樣檢測技術,可(ke)控(kong)硅輸出(chu)(chu),結構簡單、使(shi)用方便(bian)、工(gong)作(zuo)可(ke)靠(kao)。