Rockwell Allen-Bradley 1746NO4I 1769OB16
一、内部断路的快速检修方法
开机无电压输出，整机无反应。可用万用表测量变压器线圈引出端的电阻或电压即可判断。测电阻时要断开并联在线圈两端的元件。测电压时，如果次级各线圈均无电压，但初级线圈两端有电压，说明初级线圈断路。如果次级只有某一线圈无电压，说明该组线圈已经断路。断路故障多为焊接点导线霉烂所致，多发生在引出线根部或绕制过程中漆包线头的焊接点。应仔细检查每个引出端与引脚的焊接点是否断路。如均无断路，则说明故障存在于线圈的内部，可用“刺探法”寻找断线部位。即用万用表的低阻挡，将一只表笔接绕组的一个引出线，另一只表笔捆上一根细缝衣针，刺接每层线圈最靠边缘的一匝，当刺到某一层后表粗无偏转时，即说明该层线圈已断路。
对于变压器断线故障发生在绕组引出端的根部时，应先将变压器烘热，待绝缘漆软化磁用缝衣针小心地挑出线圈，再用相近线径的漆包线或多股软线与挑出的线头焊好，然后把接上的线焊在焊片上。若骨架两侧有挡板，须将挡板折弯或折断，注意不要损伤线圈和引出线。
当断路故障发生在绕组最里层时，应拆下铁心，将骨架小心撬开，挑出断线头，焊好后再引出。用厚电缆纸粘在骨架破损处，涂上绝缘漆，最后插入铁心即可。
二、内部短路的快速检修方法
变压器内部短路包括线圈内部匝间或线圈与铁心之间发生短路。发生此类故障时，会出现变压器发热现象，同时，变压器次级线圈输出电压也会出现失常，且伴有烧交流0.5A保险管等现象，这时通常采用测量次级空载电压的方法可以确定短路发生的部位。检测时，首先用万用表测量各次级绕组的空载电压，若电压均高于正常值，则说明是初级绕组存在短路；若某一个次级绕组的空载电压比额定值明显降低，则说明该绕组存在短路故障；若各次级绕组空载电压基本正常，则说明是静电屏蔽层存在短路。也可以用万用表电阻挡测量各绕组直流电阻的方法来粗略判断发生短路的部位，有短路故障绕组的电阻值较正常值要低，但轻微短路不容易判断。实际检修中发现，变压器次级线圈的电压偏低，导线较粗，发生短路的情况较少见，故障一般发生在初级线圈。
修复内部短路故障的方法是：拆下变压器，连同变压器铁心和线圈、磁屏蔽罩、短路屏蔽铜环及紧固件等。有些变压器铁心的硅钢片插得很紧，而且都要经过浸漆绝缘处理。拆硅钢片时，可先将变压器放在火炉旁边加热到75℃～85℃（手感到很烫，绝缘漆稍微冒烟），使硅钢片间的绝缘漆软化，或把变压器放入汽油中浸泡l～2小时，使绝缘漆软化。然后用改锥将硅钢片的横条剔去，用小刀将E型片间粘连处拆开。再用一段废钢锯条，在砂轮上磨成厚度及宽度与硅钢片中间舌片的厚度和宽度基本相同的铁条，注意端面要磨平直。把铁条插入剔去横条的缝隙，对准硅钢片中间舌片，用手锤敲击铁条，将E形硅钢片顶出，再用改锥把粘连的硅钢片逐步撬开，即可将硅钢片全部拆下。
三、绝缘不良的快速检修方法
变压器绝缘不良的故障表现为通电后线包局部拉弧放电，人体接触铁心时有麻电感觉，用试电笔测试时，氖灯发光。可用万用表的高阻欧姆挡测试变压器的绝缘情况，线圈与线圈间、线圈与铁心之间，绝缘电阻应大于10MΩ，如果实测阻值远小于10MΩ，则说明绝缘不良。对于绝缘不良故障，然后采取相应的检修方法即可搞定！
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