大壓縮機的工作電流很大，過載保護器吸合時引會起電弧，無法使用。普遍采用的保護方式熱敏電阻+電子模塊的保護方式。在三相繞組中布置幾個熱敏電阻，并將熱敏電阻串聯（也有并聯的）起來，與電子模塊相應端子（如S1、S2）相連。當熱敏電阻溫度到達某個臨界溫度時，其阻值會從正常溫度下的幾百歐姆劇烈增大到幾千歐姆甚至上萬歐姆，觸發電子模塊內的控制回路（如M1、M2）斷開，壓縮機停機；而當溫度降低到設定值后，模塊內控制回路會自動閉合，電機恢復運轉。

電(dian)(dian)(dian)(dian)(dian)動(dong)機保(bao)護(hu)器(qi)(qi)由三相(xiang)電(dian)(dian)(dian)(dian)(dian)流(liu)互感(gan)器(qi)(qi)、檢測(ce)、放大(da)(da)、、調(diao)(diao)整(zheng)電(dian)(dian)(dian)(dian)(dian)路(lu)和(he)執行繼(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)組成。檢測(ce)電(dian)(dian)(dian)(dian)(dian)路(lu)檢測(ce)到電(dian)(dian)(dian)(dian)(dian)流(liu)互感(gan)器(qi)(qi)感(gan)應的電(dian)(dian)(dian)(dian)(dian)流(liu)缺(que)相(xiang)或大(da)(da)于(yu)設定值時(shi)，經(jing)放大(da)(da)器(qi)(qi)放大(da)(da)，使繼(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)動(dong)作(zuo)(zuo)。繼(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)觸頭串接于(yu)接觸器(qi)(qi)線圈供電(dian)(dian)(dian)(dian)(dian)回路(lu)中，繼(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)動(dong)作(zuo)(zuo)后使接觸器(qi)(qi)斷(duan)電(dian)(dian)(dian)(dian)(dian)，起(qi)到保(bao)護(hu)電(dian)(dian)(dian)(dian)(dian)機作(zuo)(zuo)用。電(dian)(dian)(dian)(dian)(dian)路(lu)用于(yu)避(bi)開電(dian)(dian)(dian)(dian)(dian)機起(qi)動(dong)電(dian)(dian)(dian)(dian)(dian)流(liu)，其時(shi)長(chang)可調(diao)(diao)。調(diao)(diao)整(zheng)電(dian)(dian)(dian)(dian)(dian)路(lu)用于(yu)根據被保(bao)護(hu)電(dian)(dian)(dian)(dian)(dian)機工作(zuo)(zuo)電(dian)(dian)(dian)(dian)(dian)流(liu)設置(zhi)動(dong)作(zuo)(zuo)電(dian)(dian)(dian)(dian)(dian)流(liu)。

過流(liu)(liu)和過壓。綜合(he)保(bao)護器配(pei)合(he)交流(liu)(liu)接觸器使(shi)用，【在正常(chang)工作的線路(lu)中(zhong)】保(bao)護器有(you)四個(ge)接線柱，1，2是電源與接觸器線圈并聯，3，4是開關，變頻(pin)器FTB-8-90G/110P供應商，串聯在控制回路(lu)中(zhong)即(ji)可。再用表測額(e)定電流(liu)(liu)，調適保(bao)護器檢測電流(liu)(liu)，已(yi)達到預期的效果

電(dian)子式電(dian)動機(ji)保護(hu)器(qi)（電(dian)機(ji)保護(hu)器(qi)）可靠性

目(mu)前，工礦(kuang)企業熱繼(ji)(ji)電(dian)(dian)(dian)器(qi)普遍使(shi)用，但損(sun)壞(huai)電(dian)(dian)(dian)機(ji)現(xian)象也普遍存在。據調查發現(xian)，異步電(dian)(dian)(dian)機(ji)的(de)故(gu)障中(zhong)(zhong)90％以上是(shi)定子繞組因(yin)過熱損(sun)壞(huai)，而其中(zhong)(zhong)近60％是(shi)因(yin)斷(duan)相故(gu)障引(yin)起(qi)，這既(ji)說(shuo)明了(le)熱繼(ji)(ji)電(dian)(dian)(dian)器(qi)作(zuo)為斷(duan)相保(bao)(bao)護(hu)相當不可靠(kao)，又(you)說(shuo)明了(le)斷(duan)相保(bao)(bao)護(hu)的(de)必(bi)要性(xing)。且熱繼(ji)(ji)電(dian)(dian)(dian)器(qi)因(yin)電(dian)(dian)(dian)動機(ji)起(qi)動電(dian)(dian)(dian)流(liu)的(de)沖(chong)擊，引(yin)起(qi)自身的(de)斷(duan)相也偶(ou)有(you)發生，所以新穎的(de)電(dian)(dian)(dian)動機(ji)保(bao)(bao)護(hu)器(qi)必(bi)須具備(bei)斷(duan)相保(bao)(bao)護(hu)功(gong)能

前面已經(jing)提到，熱(re)繼(ji)電(dian)器(qi)(qi)的(de)發熱(re)時間常(chang)數小，對于大慣(guan)量重載(zai)起動的(de)電(dian)機(ji)非(fei)常(chang)不(bu)適應，常(chang)采用起動時短接(jie)熱(re)繼(ji)電(dian)器(qi)(qi)的(de)方法，這樣不(bu)但使控制(zhi)系統結(jie)構復雜、成本(ben)增加，同時也(ye)存在了保(bao)護的(de)死區(qu)

變頻器FTB-8-90G/110P供應商詢問報價由秦皇島富田電氣設備有限公司提供。秦皇島富田電氣設備有限公司堅持“以人為本”的企業理念，擁有一支高素質的員工隊伍，力求提供更好的產品和服務回饋社會，并歡迎廣大新老客戶光臨惠顧，真誠合作、共創美好未來。富田電氣——您可信賴的朋友，公司地址：秦皇島市北戴河區牛頭崖鎮戴河新城A區25號門市，聯系人：付先生。