電(dian)子(zi)式電(dian)動機保(bao)護器（電(dian)機保(bao)護器）解(jie)決了(le)(le)熱繼電(dian)器功(gong)能(neng)單(dan)一的(de)問(wen)題，新產生了(le)(le)需工作(zuo)電(dian)源的(de)弊端(duan)。雖然

電子線路放(fang)大、驅動需工(gong)作電源的要(yao)求在情理之中，但(dan)是對電動機保護器（電機保護器）的應用帶來了一

系列的問題，如用戶使(shi)用前必須認準電(dian)源接線端子(zi)，了解電(dian)源電(dian)壓(ya)等(deng)級等(deng)諸多不便。另外，軟啟動(dong)(dong)器(qi)FT-ZR-37KW工作原理，由于電(dian)動(dong)(dong)機保

護器（電(dian)(dian)機(ji)保護器）需要連(lian)續工作(zuo)，這樣因(yin)電(dian)(dian)網電(dian)(dian)壓的波(bo)動、干擾、自(zi)身(shen)的發(fa)熱等因(yin)素，使其的故障率也

很(hen)高。據我(wo)廠曾對使用過的(de)電子式(shi)電動(dong)機保(bao)(bao)護器(qi)(qi)（電機保(bao)(bao)護器(qi)(qi)）的(de)不完全統(tong)計(ji)，電動(dong)機保(bao)(bao)護器(qi)(qi)（電機保(bao)(bao)護

器）的自(zi)(zi)身故障一半以上均出自(zi)(zi)電(dian)源部分，這(zhe)大(da)大(da)挫傷(shang)了電(dian)氣工作(zuo)者使用電(dian)子式電(dian)動機保護器（電(dian)機保護

器）的熱情

電動機保(bao)護器的工作原理

電(dian)(dian)(dian)(dian)動(dong)機(ji)保(bao)(bao)護器(qi)(qi)(qi)(qi)由(you)三相(xiang)電(dian)(dian)(dian)(dian)流互感器(qi)(qi)(qi)(qi)、檢測(ce)、放大(da)、、調(diao)整電(dian)(dian)(dian)(dian)路(lu)和執(zhi)行(xing)繼(ji)電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)組成。檢測(ce)電(dian)(dian)(dian)(dian)路(lu)檢測(ce)到(dao)電(dian)(dian)(dian)(dian)流互感器(qi)(qi)(qi)(qi)感應的電(dian)(dian)(dian)(dian)流缺相(xiang)或(huo)大(da)于(yu)設(she)定值時(shi)，經放大(da)器(qi)(qi)(qi)(qi)放大(da)，使繼(ji)電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)動(dong)作(zuo)。繼(ji)電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)觸(chu)頭串接于(yu)接觸(chu)器(qi)(qi)(qi)(qi)線(xian)圈供電(dian)(dian)(dian)(dian)回(hui)路(lu)中，繼(ji)電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)動(dong)作(zuo)后使接觸(chu)器(qi)(qi)(qi)(qi)斷電(dian)(dian)(dian)(dian)，起到(dao)保(bao)(bao)護電(dian)(dian)(dian)(dian)機(ji)作(zuo)用(yong)。電(dian)(dian)(dian)(dian)路(lu)用(yong)于(yu)避開電(dian)(dian)(dian)(dian)機(ji)起動(dong)電(dian)(dian)(dian)(dian)流，其(qi)時(shi)長(chang)可調(diao)。調(diao)整電(dian)(dian)(dian)(dian)路(lu)用(yong)于(yu)根(gen)據(ju)被保(bao)(bao)護電(dian)(dian)(dian)(dian)機(ji)工作(zuo)電(dian)(dian)(dian)(dian)流設(she)置動(dong)作(zuo)電(dian)(dian)(dian)(dian)流。

馬達保(bao)護(hu)器（又名電(dian)(dian)動(dong)(dong)機(ji)保(bao)護(hu)器）的(de)作用是(shi)給電(dian)(dian)動(dong)(dong)機(ji)的(de)保(bao)護(hu)，在電(dian)(dian)動(dong)(dong)機(ji)出現(xian)超時啟動(dong)(dong)、過(guo)流、欠流、斷相(xiang)、堵(du)轉(zhuan)、短路、過(guo)壓、欠壓、漏電(dian)(dian)（接(jie)地）、三(san)相(xiang)不平衡、過(guo)熱、軸(zhou)承磨損、定轉(zhuan)子偏心、外部故障、來電(dian)(dian)自(zi)啟動(dong)(dong)、反時，予以報警(jing)或保(bao)護(hu)的(de)裝置。

保護功能：

過(guo)流、堵轉、斷(duan)相、三相電(dian)流不平衡、過(guo)壓、欠(qian)壓、短路、漏(lou)電(dian)（選配(pei)）等故(gu)障保(bao)護(hu)

測量功能：

三相電流、控制回路電壓的(de)測(ce)量(liang)和顯示

通用功能：

增安型(xing)電動機保(bao)護、三相(xiang)異步(bu)電動機保(bao)護、饋線保(bao)護，三種保(bao)護裝置通用

通信功能：

通過本保護器的

RS485

接(jie)口與(yu)上層系統(tong)通信。總線接(jie)口支(zhi)持(chi)參數設置、控制及監測(ce)等功(gong)能，支(zhi)持(chi)

Modbus

通信協議。