由于大(da)(da)(da)(da)型电(dian)(dian)机(ji)保(bao)护不全(quan)面和现有的保(bao)护装置(zhi)不动(dong)作(zuo)，而造成(cheng)电(dian)(dian)机(ji)烧(shao)毁(hui)(hui)(hui)(hui)占烧(shao)毁(hui)(hui)(hui)(hui)电(dian)(dian)机(ji)总数的 60% 左右。可见，所占比例相(xiang)(xiang)当(dang)大(da)(da)(da)(da)。我公(gong)司低压电(dian)(dian)机(ji)的保(bao)护主(zhu)要有短(duan)路保(bao)护、过载(zai)保(bao)护两(liang)种，而无断相(xiang)(xiang)保(bao)护。但在(zai)实际运(yun)行(xing)中，大(da)(da)(da)(da)型电(dian)(dian)机(ji)发生断相(xiang)(xiang)运(yun)行(xing)的几率特别多，当(dang)大(da)(da)(da)(da)型电(dian)(dian)机(ji)发生断相(xiang)(xiang)运(yun)行(xing)时，大(da)(da)(da)(da)型电(dian)(dian)机(ji)保(bao)护装置(zhi)无法动(dong)作(zuo)，而造成(cheng)电(dian)(dian)机(ji)大(da)(da)(da)(da)量烧(shao)毁(hui)(hui)(hui)(hui)。下面子昂机(ji)电(dian)(dian)设(she)备来为大(da)(da)(da)(da)家讲解大(da)(da)(da)(da)型电(dian)(dian)机(ji)烧(shao)毁(hui)(hui)(hui)(hui)的原因分析。

一、环境和通风散热方面的原因：

1、风(feng)扇破损、变形、松脱,或(huo)者(zhe)未装(zhuang)或(huo)装(zhuang)反(fan),使大型(xing)电机通(tong)风(feng)散(san)热(re)不良。

2、封闭式(shi)大(da)(da)型电机外壳散(san)(san)热筋片缺损过多,散(san)(san)热面积减少；或者防护式(shi)大(da)(da)型电机风扇堵塞,都会(hui)造成大(da)(da)型电机通(tong)风散(san)(san)热不良(liang)而温(wen)升过高。

3、大型电(dian)(dian)机工作环境和通风过高,大型电(dian)(dian)机得不到(dao)良(liang)好的(de)通风散热(re)(re)而过热(re)(re)。

4、大型电(dian)机内的(de)灰尘、油垢过多,不利于大型电(dian)机的(de)散热。

5、风(feng)罩或大(da)型(xing)电(dian)机内(nei)挡风(feng)板未装,导致风(feng)路不(bu)畅,大(da)型(xing)电(dian)机散热不(bu)良。

二、大型电机本身内部的原因：

1、定(ding)、转子发(fa)生摩擦发(fa)热。

2、异步(bu)大(da)型电机的笼型转(zhuan)子导条(tiao)断裂,或绕线转(zhuan)子绕组断线。大(da)型电机出力不(bu)足(zu)而过热。

3、大型电(dian)机(ji)轴承过热(re)。

4、安装(zhuang)和(he)维修(xiu)大型电机时,误将△形接法的大型电机绕组(zu)接成了Y形接法,或者误将Y形接法的接成了△形。  

5、绕组(zu)相间、匝间短路或接地,导致绕组(zu)电(dian)(dian)流增大,三(san)相电(dian)(dian)流不(bu)平衡,使大型(xing)电(dian)(dian)机过热。

6、极相组(zu)线圈(quan)连接不正确(que)或每相线圈(quan)数分配不均(jun),造成三相空载(zai)电(dian)流(liu)不平衡,并且(qie)电(dian)流(liu)过大；大型电(dian)机运行时三相电(dian)流(liu)严(yan)重(zhong)不平衡,产生噪声(sheng)和振(zhen)动(dong),大型电(dian)机过热。

三、大型电机负载方面的原因：

1、被拖动机械(xie)故障(zhang),使(shi)大型电机出力增大,或(huo)被卡(ka)住(zhu)不转或(huo)转速(su)急(ji)剧下降,使(shi)大型电机电流猛增而(er)过热(re)。

2、大型电(dian)机(ji)的(de)工作(zuo)制式和负载(zai)工作(zuo)制不(bu)匹配(pei),例如(ru)短时周(zhou)期(qi)工作(zuo)制的(de)大型电(dian)机(ji)用于(yu)带动连续长期(qi)工作(zuo)的(de)负载(zai)。

3、大(da)型电机长时间过(guo)负载运行,定子电流(liu)大(da)大(da)超过(guo)额定电流(liu),大(da)型电机过(guo)热。

4、大(da)型(xing)(xing)电机启(qi)动(dong)于(yu)频繁,启(qi)动(dong)时(shi)间过长或者启(qi)动(dong)间隔时(shi)间太短,都会引起大(da)型(xing)(xing)电机温(wen)升过高(gao)。 

以上(shang)(shang)就是子(zi)(zi)(zi)昂机电(dian)(dian)(dian)(dian)(dian)(dian)(dian)为大(da)家(jia)讲解的(de)大(da)型(xing)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机烧毁(hui)的(de)三原因讲解，希望(wang)可以给(ji)大(da)家(jia)带来帮助。山东子(zi)(zi)(zi)昂机电(dian)(dian)(dian)(dian)(dian)(dian)(dian)设备有限公司(si)是一家(jia)专注高低压电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机、电(dian)(dian)(dian)(dian)(dian)(dian)(dian)气产(chan)品的(de)维(wei)修(xiu)、研发(fa)、生产(chan)、销售和服务为一体(ti)的(de)科技型(xing)企业。本公司(si)专业维(wei)修(xiu)：西(xi)(xi)安西(xi)(xi)玛(ma)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机、上(shang)(shang)海电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机、中电(dian)(dian)(dian)(dian)(dian)(dian)(dian)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机、兰州(zhou)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机、湘(xiang)潭电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机、佳木斯电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机、沈(shen)阳电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机、江西(xi)(xi)东元(yuan)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机、无锡(xi)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机、六安电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机、ＡＢＢ电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机、西(xi)(xi)门子(zi)(zi)(zi)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机等(deng)各大(da)型(xing)高低压电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机、直(zhi)流电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机、发(fa)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机、防爆电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机及同(tong)步电(dian)(dian)(dian)(dian)(dian)(dian)(dian)机维(wei)修(xiu)、维(wei)护、保养及现场拆检等(deng)服务。