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電機定子燒毀的主要原因如下

文章出處:maituwangluo.com  |  發布時間:2020/12/23 15:02:46  |  瀏覽次數:282
電機定子燒毀的主(zhu)要原因如下
電(dian)(dian)(dian)機維護不(bu)全,電(dian)(dian)(dian)機維護不(bu)到(dao)位,導(dao)致電(dian)(dian)(dian)機燒損約占燒損電(dian)(dian)(dian)機總數的60%。
每個(ge)車(che)間的(de)操(cao)作(zuo)人員都不(bu)(bu)懂電(dian)的(de)基(ji)礎知識(shi),不(bu)(bu)懂得(de)電(dian)機(ji)的(de)維護保養,電(dian)機(ji)的(de)燒(shao)損(sun)占燒(shao)損(sun)電(dian)機(ji)總數的(de)20%左右。
由(you)于電機(ji)長(chang)期在惡劣環(huan)境和(he)強腐蝕(shi)性下運行,環(huan)境無(wu)法改善,電機(ji)燒損(sun)約占燒損(sun)電機(ji)總數的20%。
操作(zuo)人員(yuan)素質低,巡檢不到位(wei),導致電(dian)機燒毀約占(zhan)燒毀電(dian)機總數的10%。
維修后(hou)電機質量(liang)不好,電機再燒約(yue)占燒電機總數的5%。
電機燒毀原因分析
如(ru)上(shang)所述,由于電(dian)機(ji)維(wei)(wei)(wei)護(hu)不(bu)徹底,電(dian)機(ji)燒毀(hui)約占燒毀(hui)電(dian)機(ji)總(zong)數的60%。可(ke)見比(bi)例還是挺大的。我公司低壓(ya)電(dian)機(ji)的維(wei)(wei)(wei)護(hu)主要(yao)包括(kuo)短路維(wei)(wei)(wei)護(hu)和過載(zai)維(wei)(wei)(wei)護(hu),不(bu)包括(kuo)斷相(xiang)(xiang)維(wei)(wei)(wei)護(hu)。但在實際運行(xing)中,電(dian)機(ji)斷相(xiang)(xiang)運行(xing)的概率極高。當(dang)電(dian)機(ji)斷相(xiang)(xiang)運行(xing)時,電(dian)機(ji)維(wei)(wei)(wei)護(hu)裝置無法運行(xing),導致大量電(dian)機(ji)燒毀(hui)。
保(bao)險絲主(zhu)要用(yong)(yong)于短(duan)(duan)路(lu)維(wei)(wei)(wei)(wei)護(hu)(hu)(RT0和(he)RL系列保(bao)險絲使用(yong)(yong)頻率較高)。維(wei)(wei)(wei)(wei)修的(de)靈敏度不高,對于阻斷大的(de)短(duan)(duan)路(lu)電(dian)(dian)(dian)(dian)流(liu)(liu)可以(yi)很強。但對于沒有達(da)到(dao)熔斷器(qi)截止(zhi)點的(de)短(duan)(duan)路(lu)電(dian)(dian)(dian)(dian)流(liu)(liu),通(tong)常不動(dong)(dong)作(zuo)。過載(zai)(zai)維(wei)(wei)(wei)(wei)修主(zhu)要采用(yong)(yong)熱繼電(dian)(dian)(dian)(dian)器(qi)維(wei)(wei)(wei)(wei)修。適(shi)用(yong)(yong)于長時間運行(xing)或輕負荷連續(xu)運行(xing)。但是我公司的(de)電(dian)(dian)(dian)(dian)機負載(zai)(zai)經常變化,都是帶負載(zai)(zai)啟動(dong)(dong),經常造(zao)成(cheng)過載(zai)(zai),堵轉。因此,熱繼電(dian)(dian)(dian)(dian)器(qi)不能起到(dao)足夠的(de)維(wei)(wei)(wei)(wei)護(hu)(hu)作(zuo)用(yong)(yong)。以(yi)上(shang)兩種維(wei)(wei)(wei)(wei)護(hu)(hu)在(zai)維(wei)(wei)(wei)(wei)護(hu)(hu)我們的(de)電(dian)(dian)(dian)(dian)機上(shang)有一定的(de)缺(que)點。但是我們公司設備比較多,維(wei)(wei)(wei)(wei)修不可能完全換(huan)。因此,選(xuan)擇(ze)熔斷器(qi)和(he)熱繼電(dian)(dian)(dian)(dian)器(qi)的(de)電(dian)(dian)(dian)(dian)流(liu)(liu)整定值尤為重要。
按(an)規定(ding),熔斷器選擇(ze)為(wei)I  fuse=(1.5-2.5)ID,電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)ID-額定(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流,熱繼電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器選擇(ze)為(wei)I  heat=1.05ID,以(yi)上維(wei)護(hu)定(ding)值(zhi)適(shi)用于我公(gong)司的(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)維(wei)護(hu)。通過對燒毀電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)的(de)跟蹤調查,發現拒絕進(jin)行(xing)短路維(wei)修的(de)原因(yin)是(shi)保險絲(si)選擇(ze)不正確。每(mei)個電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)維(wei)修團隊對維(wei)修設置的(de)選擇(ze)是(shi)根據規定(ding)的(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)容量(liang),但根據經驗或當地條(tiao)件,使用多少;也許把(ba)保險絲(si)的(de)熔化電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流和電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)的(de)啟動電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流相比較。
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