電動(dong)機保護原理和作用

過載保護

當電(dian)動(dong)機在過(guo)(guo)負載故障下，長時(shi)間(jian)超過(guo)(guo)其額(e)定電(dian)流運行(xing)時(shi)，會導(dao)致電(dian)動(dong)機過(guo)(guo)熱，絕緣降低而燒毀，保護(hu)器(qi)根據電(dian)動(dong)機的發(fa)熱特性，計算電(dian)動(dong)機的熱容量，模擬(ni)電(dian)動(dong)機發(fa)熱特性對電(dian)動(dong)機進行(xing)保護(hu)，過(guo)(guo)載保護(hu)不同脫(tuo)扣級別(bie)對應的特征。

欠載保護

當電(dian)動(dong)(dong)機(ji)所帶負(fu)載(zai)為泵式負(fu)載(zai)時，電(dian)動(dong)(dong)機(ji)空載(zai)或(huo)欠載(zai)運(yun)轉會產生危害，保(bao)護(hu)(hu)器提供欠載(zai)保(bao)護(hu)(hu)，當三相的平均電(dian)流與額(e)定電(dian)流的百分比(bi)低于設定值(zhi)時，保(bao)護(hu)(hu)器應在動(dong)(dong)作（延時）設定時間(jian)(jian)內(nei)動(dong)(dong)作或(huo)在報警時間(jian)(jian)內(nei)報警。

堵轉(zhuan)/阻塞保護

電(dian)(dian)(dian)動機(ji)(ji)在(zai)起(qi)動時(shi)(shi)(shi)或(huo)運行(xing)過(guo)程(cheng)中(zhong)，如(ru)果由于(yu)負(fu)荷過(guo)大或(huo)自身機(ji)(ji)械原因(yin)，造(zao)成電(dian)(dian)(dian)時(shi)(shi)(shi)機(ji)(ji)軸被卡住，而未及時(shi)(shi)(shi)解(jie)除故(gu)障，將造(zao)成電(dian)(dian)(dian)機(ji)(ji)過(guo)熱，絕緣降低而燒毀電(dian)(dian)(dian)機(ji)(ji)，堵(du)轉保(bao)護(hu)適(shi)用于(yu)電(dian)(dian)(dian)動機(ji)(ji)起(qi)動發(fa)生此類故(gu)障進行(xing)保(bao)護(hu)，阻塞保(bao)護(hu)適(shi)用于(yu)電(dian)(dian)(dian)動機(ji)(ji)運行(xing)過(guo)程(cheng)中(zhong)發(fa)生此類故(gu)障時(shi)(shi)(shi)進行(xing)保(bao)護(hu)，當電(dian)(dian)(dian)流達到動作(zuo)(zuo)(zuo)設(she)定(ding)電(dian)(dian)(dian)流時(shi)(shi)(shi)，保(bao)護(hu)器(qi)應在(zai)動作(zuo)(zuo)(zuo)（延時(shi)(shi)(shi)）設(she)定(ding)時(shi)(shi)(shi)間內動作(zuo)(zuo)(zuo)或(huo)在(zai)報(bao)(bao)警(jing)時(shi)(shi)(shi)間內報(bao)(bao)警(jing)。

斷相（不平衡(heng)）保(bao)護

斷(duan)相（不(bu)平(ping)(ping)(ping)衡）故(gu)障(zhang)運(yun)行(xing)時電動機(ji)的(de)危(wei)害很大(da)，當電動機(ji)發(fa)(fa)生斷(duan)相或三相電流嚴(yan)重不(bu)平(ping)(ping)(ping)衡時，如不(bu)平(ping)(ping)(ping)衡率(lv)達到保(bao)護設(she)定值時，保(bao)護器按照設(she)定的(de)要求保(bao)護，發(fa)(fa)出停車(che)或報(bao)警(jing)指令，使電動機(ji)的(de)運(yun)行(xing)更加安全。

接地/漏電保護

保(bao)(bao)(bao)護(hu)器同(tong)時具備接(jie)(jie)地(di)保(bao)(bao)(bao)護(hu)和漏電(dian)(dian)(dian)保(bao)(bao)(bao)護(hu)功能。接(jie)(jie)地(di)保(bao)(bao)(bao)護(hu)電(dian)(dian)(dian)流信號(hao)取于(yu)內部電(dian)(dian)(dian)流互感器的(de)矢量和，用(yong)于(yu)保(bao)(bao)(bao)護(hu)相線對(dui)電(dian)(dian)(dian)動機(ji)金屬(shu)外殼的(de)短路保(bao)(bao)(bao)護(hu)，保(bao)(bao)(bao)護(hu)器可(ke)通過增加漏電(dian)(dian)(dian)互感器，檢(jian)測出30mA~50mA的(de)故障電(dian)(dian)(dian)流，主要用(yong)于(yu)非直接(jie)(jie)接(jie)(jie)地(di)的(de) 保(bao)(bao)(bao)護(hu)，以保(bao)(bao)(bao)證人身安全(quan)。

外部故障保護

當保護(hu)(hu)器(qi)(qi)檢測(ce)到有外(wai)部(bu)故障出現，外(wai)部(bu)故障開關量輸入與保護(hu)(hu)器(qi)(qi)定義(yi)的開關量輸入狀態不一致時，保護(hu)(hu)器(qi)(qi)按照設(she)定的要求保護(hu)(hu)，確保電動(dong)機設(she)備安(an)全。

起動超時保護

在電(dian)(dian)動(dong)機(ji)起動(dong)過程中(zhong)，保(bao)護(hu)(hu)器只(zhi)具有斷相（不平衡），接地/漏電(dian)(dian)等保(bao)護(hu)(hu)功(gong)(gong)能(neng)，其余(yu)保(bao)護(hu)(hu)功(gong)(gong)能(neng)不起作用(yong)，在起動(dong)結束(shu)后(hou)，所(suo)有保(bao)護(hu)(hu)功(gong)(gong)能(neng)（按(an)用(yong)戶(hu)設定(ding)）均(jun)自動(dong)投入，當電(dian)(dian)動(dong)機(ji)起動(dong)時(shi)(shi)間(jian)超過用(yong)戶(hu)設定(ding)的起動(dong)時(shi)(shi)間(jian)，電(dian)(dian)流(liu)還大于額(e)定(ding)電(dian)(dian)流(liu)1.1倍時(shi)(shi)，保(bao)護(hu)(hu)器按(an)照(zhao)設定(ding)的要求保(bao)護(hu)(hu)，在動(dong)作（延時(shi)(shi)）設定(ding)時(shi)(shi)間(jian)內發出停車命(ming)令(ling)，停止電(dian)(dian)機(ji)運行。

相(xiang)序保(bao)護

具有相序(xu)(xu)保護功能(neng)的(de)(de)保護器(qi)，當其電源側(ce)的(de)(de)電壓(ya)相位順序(xu)(xu)與設(she)定的(de)(de)順序(xu)(xu)一致時(shi)，保護器(qi)應(ying)不動(dong)(dong)作。當保護器(qi)檢測到電動(dong)(dong)d的(de)(de)相序(xu)(xu)接錯(cuo)時(shi)，電動(dong)(dong)機(ji)應(ying)不能(neng)起動(dong)(dong)。

欠壓(ya)保護

電(dian)(dian)(dian)壓過低會引(yin)起電(dian)(dian)(dian)動(dong)(dong)機轉速降(jiang)低，甚至停止運行(xing)(xing)，當電(dian)(dian)(dian)動(dong)(dong)機運行(xing)(xing)電(dian)(dian)(dian)壓下降(jiang)至設(she)(she)定的(de)(de)欠電(dian)(dian)(dian)壓保(bao)(bao)護(hu)范(fan)圍時(shi)，保(bao)(bao)護(hu)器按(an)設(she)(she)定的(de)(de)要求進(jin)行(xing)(xing)保(bao)(bao)護(hu)，在動(dong)(dong)作（延時(shi)）設(she)(she)定時(shi)間內動(dong)(dong)作或(huo)在報警(jing)時(shi)間內報警(jing)，以避免重(zhong)要的(de)(de)生(sheng)產工(gong)藝造成混亂，嚴重(zhong)影響生(sheng)產。

過壓(ya)保護

電(dian)(dian)壓(ya)(ya)過(guo)高會引起電(dian)(dian)動(dong)機絕緣程度損傷，當電(dian)(dian)動(dong)機運行(xing)電(dian)(dian)壓(ya)(ya)超過(guo)設定(ding)(ding)的保護(hu)電(dian)(dian)壓(ya)(ya)時(shi)保護(hu)器按設定(ding)(ding)的要求進行(xing)保護(hu)，在動(dong)作（延時(shi)）設定(ding)(ding)時(shi)間內動(dong)作或在報警時(shi)間內報警，以保證電(dian)(dian)動(dong)機設備(bei)安全。

欠功率保護

電(dian)(dian)(dian)動(dong)機(ji)由于傳動(dong)裝置損壞，失去機(ji)械輸出能力，欠載(zai)運行時，電(dian)(dian)(dian)動(dong)機(ji)功(gong)率因(yin)數較低，但電(dian)(dian)(dian)動(dong)機(ji)電(dian)(dian)(dian)流很大，大量消(xiao)耗(hao)系統的(de)無功(gong)，當負載(zai)功(gong)率與額定功(gong)率的(de)百分(fen)比低于設定動(dong)作值時，保(bao)護器在動(dong)作（延(yan)時）設定時間內動(dong)作或(huo)在報警時間內報警。

過(guo)熱(re)保護

過(guo)熱保(bao)護采用數學(xue)方法建立電動(dong)機的發熱模型，從原理上解決了低壓電動(dong)機的熱保(bao)護問題(ti)。

我司自(zi)主研發的驅動器(qi)器(qi)件有自(zi)動保(bao)護(hu)(hu)功能(neng)，電(dian)機電(dian)流自(zi)動控(kong)制，具(ju)(ju)備欠壓(ya)、過壓(ya)、堵轉、霍爾故(gu)障燈等多種(zhong)保(bao)護(hu)(hu)功能(neng)，保(bao)護(hu)(hu)完善，功能(neng)齊全，可靠性(xing)高。具(ju)(ju)體選型請聯系我們(men)的銷售工程師哦~