国产精品无码永久免费888_久久综合九色综合欧美狠狠_毛片在线播放a_天堂√在线中文最新版8

   電(dian)動(dong)機(ji)的(de)(de)短(duan)路故(gu)(gu)障(zhang)是(shi)(shi)比較(jiao)嚴(yan)重的(de)(de)一種故(gu)(gu)障(zhang)，危害性很大。短(duan)路故(gu)(gu)障(zhang)包括(kuo)定子繞(rao)(rao)組(zu)的(de)(de)相(xiang)(xiang)(xiang)間(jian)(jian)短(duan)路和(he)一相(xiang)(xiang)(xiang)繞(rao)(rao)組(zu)匝(za)(za)間(jian)(jian)短(duan)路。定子繞(rao)(rao)組(zu)的(de)(de)相(xiang)(xiang)(xiang)間(jian)(jian)短(duan)路是(shi)(shi)電(dian)動(dong)機(ji)最(zui)嚴(yan)重的(de)(de)故(gu)(gu)障(zhang)，它(ta)會引起(qi)電(dian)動(dong)機(ji)本身的(de)(de)嚴(yan)重損(sun)壞，使供電(dian)網絡的(de)(de)電(dian)壓顯著(zhu)下(xia)降，影響(xiang)其它(ta)用電(dian)設備的(de)(de)正常工(gong)作。一相(xiang)(xiang)(xiang)匝(za)(za)間(jian)(jian)短(duan)路是(shi)(shi)較(jiao)常見的(de)(de)短(duan)路故(gu)(gu)障(zhang)，該故(gu)(gu)障(zhang)初期(qi)僅表現為三(san)相(xiang)(xiang)(xiang)電(dian)流不對稱，使故(gu)(gu)障(zhang)相(xiang)(xiang)(xiang)的(de)(de)相(xiang)(xiang)(xiang)電(dian)流增大，嚴(yan)重的(de)(de)情(qing)況會導致匝(za)(za)間(jian)(jian)線圈絕緣全部燒毀(hui)，使電(dian)動(dong)機(ji)的(de)(de)一相(xiang)(xiang)(xiang)繞(rao)(rao)組(zu)全部短(duan)接(jie)(jie)。此時，負載星形(xing)聯接(jie)(jie)的(de)(de)非故(gu)(gu)障(zhang)相(xiang)(xiang)(xiang)將(jiang)承受(shou)線電(dian)壓，負載三(san)角(jiao)形(xing)聯接(jie)(jie)的(de)(de)將(jiang)產生相(xiang)(xiang)(xiang)間(jian)(jian)短(duan)路，這會使電(dian)動(dong)機(ji)遭受(shou)嚴(yan)重損(sun)壞。

   電(dian)(dian)(dian)(dian)動(dong)機相(xiang)間短(duan)路(lu)(lu)(lu)故(gu)障最(zui)明顯的(de)特征是(shi)三(san)相(xiang)供電(dian)(dian)(dian)(dian)線路(lu)(lu)(lu)的(de)故(gu)障相(xiang)會(hui)出現大(da)電(dian)(dian)(dian)(dian)流(liu)(liu)，危(wei)害性(xing)很(hen)大(da)，應進(jin)行速斷保(bao)(bao)護(hu)。短(duan)路(lu)(lu)(lu)保(bao)(bao)護(hu)的(de)整(zheng)定(ding)值(zhi)應大(da)于電(dian)(dian)(dian)(dian)動(dong)機最(zui)大(da)穩定(ding)啟動(dong)電(dian)(dian)(dian)(dian)流(liu)(liu)，一(yi)般取電(dian)(dian)(dian)(dian)動(dong)機額定(ding)電(dian)(dian)(dian)(dian)流(liu)(liu)的(de)8～l0倍(bei)。在進(jin)行短(duan)路(lu)(lu)(lu)保(bao)(bao)護(hu)時(shi)，通過(guo)(guo)檢(jian)(jian)測電(dian)(dian)(dian)(dian)動(dong)機A，B，C三(san)相(xiang)線電(dian)(dian)(dian)(dian)流(liu)(liu)來實現，超過(guo)(guo)整(zheng)定(ding)值(zhi)后，直接(jie)進(jin)行斷電(dian)(dian)(dian)(dian)保(bao)(bao)護(hu)。短(duan)路(lu)(lu)(lu)保(bao)(bao)護(hu)的(de)原則是(shi)，當在一(yi)定(ding)時(shi)限(當然很(hen)短(duan))內檢(jian)(jian)測到三(san)相(xiang)最(zui)大(da)電(dian)(dian)(dian)(dian)流(liu)(liu)超過(guo)(guo)電(dian)(dian)(dian)(dian)動(dong)機額定(ding)線電(dian)(dian)(dian)(dian)流(liu)(liu)K倍(bei)時(shi)（K為短(duan)路(lu)(lu)(lu)過(guo)(guo)流(liu)(liu)倍(bei)數，一(yi)般取8～10)，就認為電(dian)(dian)(dian)(dian)動(dong)機有短(duan)路(lu)(lu)(lu)故(gu)障，應進(jin)行速斷保(bao)(bao)護(hu)。

SJD550系列 電動機保護器 是一款綜(zong)合型的低壓 電動機綜合保護器 。 具備工程(cheng)應(ying)用中(zhong)各(ge)種的(de)電壓、電流保護功(gong)能(neng)、開關量輸(shu)入、兩路RS485通訊及模擬(ni)量輸(shu)出功(gong)能(neng)，從而為工業生產過程(cheng)控制和實現(xian)配(pei)電自動化提(ti)供了(le)最為經濟、有效、合理的(de)手段(duan)。為用戶建立(li)一個安全可靠(kao)、簡單快捷(jie)、功(gong)能(neng)強大的(de)符(fu)合現(xian)場總線(xian)要求(qiu)的(de) 電動機(ji)保護 、測量控制、管理與通信的系統。