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電動機缺相的預防措施有哪些技巧

文章出處:maituwangluo.com  |  發布時間:2020/7/15 16:33:55  |  瀏覽次數:330
電(dian)動機缺相的預防措施(shi)有哪些技巧
1、斷路器:
斷路(lu)(lu)(lu)器用(yong)(yong)于(yu)不頻繁(fan)地接通和分(fen)斷電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)、在(zai)保(bao)護(hu)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)時,有(you)兩點需要(yao)特別注意(yi),一(yi)是(shi)它的(de)(de)過載能(neng)力,二(er)是(shi)它的(de)(de)起動(dong)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)很大,因此,在(zai)選擇時要(yao)分(fen)清要(yao)保(bao)護(hu)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)時的(de)(de)類別,選擇保(bao)護(hu)籠型(xing)異步電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)時斷路(lu)(lu)(lu)器的(de)(de)瞬(shun)時整(zheng)定電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)值在(zai) 8-15 倍于(yu)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)額定電(dian)(dian)(dian)(dian)(dian)(dian)流(liu),保(bao)護(hu)繞線(xian)轉子異步電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)時瞬(shun)時整(zheng)定電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)值在(zai) 3-6 倍于(yu)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)額定電(dian)(dian)(dian)(dian)(dian)(dian)流(liu),嚴禁把(ba)斷路(lu)(lu)(lu)器作(zuo)為電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)設備停止運行用(yong)(yong)的(de)(de)操作(zuo)機(ji)(ji)構. 上文提到的(de)(de)案例(li)、把(ba)風扇、日光燈的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)源加裝接觸(chu)器起動(dong)且三相均(jun)勻(yun)分(fen)布,嚴格規(gui)定先停用(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)設備再拉斷路(lu)(lu)(lu)器,再也(ye)沒有(you)出現(xian)斷路(lu)(lu)(lu)缺相現(xian)象。
2、熔斷(duan)器(qi):
故障(zhang)性熔(rong)(rong)(rong)(rong)斷(duan),嚴格按(an)標準(zhun)安裝(zhuang)(zhuang)設(she)備、電(dian)(dian)氣線(xian)路。選擇能(neng)(neng)適應周圍環境(jing)的(de)(de)電(dian)(dian)動機(ji)(ji)、對(dui)需頻繁(fan)正反轉(zhuan)起(qi)動的(de)(de)電(dian)(dian)動機(ji)(ji)進行(xing)技(ji)術改造,加(jia)裝(zhuang)(zhuang)延時裝(zhuang)(zhuang)置錯開高峰沖擊電(dian)(dian)流(liu)。非(fei)故障(zhang)性熔(rong)(rong)(rong)(rong)斷(duan),在非(fei)故障(zhang)性熔(rong)(rong)(rong)(rong)斷(duan)器(qi)(qi)(qi)熔(rong)(rong)(rong)(rong)斷(duan)方面(mian),要(yao)(yao)合理選擇,不(bu)要(yao)(yao)存(cun)在一些(xie)誤區,認(ren)為能(neng)(neng)躲(duo)過(guo)一般的(de)(de)起(qi)動電(dian)(dian)流(liu)、就是(shi)的(de)(de)保(bao)護電(dian)(dian)動機(ji)(ji)熔(rong)(rong)(rong)(rong)體的(de)(de)標準(zhun)值(zhi),因而(er)盡量選擇接近電(dian)(dian)動機(ji)(ji)啟動電(dian)(dian)流(liu)值(zhi)的(de)(de)標準(zhun)熔(rong)(rong)(rong)(rong)斷(duan)器(qi)(qi)(qi),其實(shi)安裝(zhuang)(zhuang)熔(rong)(rong)(rong)(rong)斷(duan)保(bao)護器(qi)(qi)(qi)的(de)(de)作(zuo)用,是(shi)用來保(bao)護電(dian)(dian)動機(ji)(ji)的(de)(de)相(xiang)間(jian)短路事故或(huo)是(shi)單相(xiang)接地事故,而(er)不(bu)是(shi)用來對(dui)電(dian)(dian)動機(ji)(ji)進行(xing)過(guo)負荷保(bao)護,過(guo)負荷保(bao)護功能(neng)(neng)是(shi)由熱繼(ji)電(dian)(dian)器(qi)(qi)(qi)來完(wan)成(cheng)的(de)(de)。
3. 接觸器(qi):
不(bu)(bu)同(tong)工作(zuo)(zuo)制、選(xuan)擇與該工作(zuo)(zuo)制相匹(pi)配容量(liang)的(de)(de)接(jie)觸(chu)器(qi)。例(li)如:長期工作(zuo)(zuo)制時應盡(jin)量(liang)選(xuan)擇銀(yin)合(he)金或鑲(xiang)銀(yin)觸(chu)頭的(de)(de)接(jie)觸(chu)器(qi),銅觸(chu)頭則要將(jiang)其容量(liang)降至間(jian)斷(duan)長期工作(zuo)(zuo)制額定容量(liang)的(de)(de) 50%以下(xia)使用, 頻繁操作(zuo)(zuo)時必須(xu)考慮電弧能量(liang)的(de)(de)影(ying)響。不(bu)(bu)同(tong)的(de)(de)環境選(xuan)擇能適應環境的(de)(de)接(jie)觸(chu)器(qi).例(li)如:潮濕、腐蝕氣體、多塵、振動等環境都會便(bian)接(jie)觸(chu)器(qi)的(de)(de)鐵(tie)質部件生(sheng)銹,增大動靜觸(chu)頭間(jian)拉弧距離,減(jian)少吸合(he)力,引起(qi)卡阻現象,鐵(tie)芯極(ji)面(mian)不(bu)(bu)平等等。
4、熱繼電器(qi):
選擇相匹配的熱(re)繼電(dian)器,分清長、短期保護功能(neng),一(yi)般情(qing)況下按(an)電(dian)動機額定電(dian)流的 0.95-1.05 倍選取。
5、電動機:
新(xin)購電(dian)(dian)動機或(huo)是新(xin)修繞組的電(dian)(dian)動機、要(yao)進行電(dian)(dian)阻(zu)測量電(dian)(dian)動機繞組質(zhi)量的好(hao)壞、電(dian)(dian)功機的接(jie)線(xian)(xian)端子與電(dian)(dian)源線(xian)(xian)壓接(jie)線(xian)(xian)耳(er)的接(jie)觸(chu)面之(zhi)間涂上導(dao)電(dian)(dian)膏(gao)(gao)。因為電(dian)(dian)動機三相(xiang)繞組的電(dian)(dian)阻(zu)值都是相(xiang)等的、尤其對于鋁線(xian)(xian)繞組外接(jie)到銅端子時要(yao)涂上導(dao)電(dian)(dian)膏(gao)(gao)、阻(zu)絕空氣對鋁的氧化、增加導(dao)電(dian)(dian)性、這樣就不會出現因氧化斷線(xian)(xian)而(er)缺相(xiang)現象。
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