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常见问答
烧中频变压器是什么原因
故障现象:中频变压器烧坏,更换后启动设备依旧烧坏中频变压器。 故障分析及处理:这种故障常见于在采用升压负载的设备上,主要是因为泄放电感虚接开路引起的。 在升压负载中,串联电容器组和并联电容器组两端的电压不可能****一致,在两组补偿电容器放电时,由于端电压不一致,其放电时间的长短也不一样,则电压高的放电时间慢,而这组电容器还没有完全放电完成时又开始充电过程,在此电容器组上就会积累直流电荷,这些直流电荷要通过泄放电感进行释放,如果泄放电感开路,电容器上积累的直流电荷就会通过中频变压器释放,由于中频变压器的容量很小,承受不了这么大的电流流过,引起中频变压器烧坏。
中频启动后频率高是什么原因
故障现象:能启动,启动成功后频率比原来高许多,有时不好启动。 故障分析及处理:这多数是负载问题。 a.负载线圈匝间有短路现象,可能线间搭接或有导电铁屑、铜丝等。 b.负载电容器有柱子开路,或电容连接线有严重打火,造成内部容量发生变化
升压时易过压,或过压、过流同时出现
故障现象:容易启动,但升电压时容易过压,有时过压、过流同时出现。 故障分析及处理如下。 a.启动时容易过压,说明逆变引前角过大,造成逆变毛刺电压过高,易使过压保护动作。在扫频电路中,过压后有使逆变桥直通放电功能,此时如果电流也大,则过流保护也会动作。 b.电源柜体内部的主电路有虚接、绝缘降低、打火现象。 c.负载线圈或电容器有虚接、绝缘降低、打火现象。 d.逆变晶闸管触发有不可靠因素,连线松动或门极
直流电压升到500V以上后,直流电压反而下降
故障现象:启动和运行正常,当直流电压升到500V以上后,直流电压反而下降,出现波动,甚至过流,有时烧断快熔。 故障分析及处理:这是整流移相电路的问题: a.控制板上的零线未接。控制板上的同步信号电路有的需要零线,如果缺少,就会出现移相偏差,导通角α超过0°,出现上述现象。 b.用户没有将零线接入柜体或零线虚接。 c.整流电路的w4电位器(调节150°)有问题,当调节过量时,导通角α超过0°。有时控制板上前端给定电路有问题时,也会出现导通角α超过0°。
电抗器声音大、沉闷,升压时不稳定,颤抖
故障现象:设备可以启动,但电压升不高,电抗器声音特别大、沉闷,电压升起时很不稳定,有颤抖。不时有过流或过压故障,有时甚至烧坏逆变管,但断开逆变电路整流部分是好的。 故障分析及处理:这种故障多数是电抗器有问题。 a.电抗器的电感量比正常的大,出现磁路饱和,起不到续流滤波作用,也不能隔开交流和直流端的电流,电抗器线圈匝数比正常的多。 b.电抗器气隙板比正常的要薄,电感量变大,此时要加厚气隙板。 c.电抗器的线圈匝间有渗水、匝间绝缘降低出现打火放电现象。
对中频炉几个常见故障的分析 1.烘炉一段时间后,停机不好启动
故障现象:对新熔炼炉或打结的透热炉,在开始烘炉可以启动,电压可以升高达到****值,但烘炉一段时间后,停机后再也不好启动,起来后电压也升不高,有时自己停振或过流。 故障分析及处理:这种故障多数是感应器匝间有问题。 a.对刚打结好的熔炼炉,由于打结料在烘炉时会产生大量的水分,故使感应器匝间聚集了大量的水珠,造成匝间绝缘降低,此时烘炉电压不应很高,待烘干后再提高电压。 b.有的感应器线圈没有浸绝缘漆就直接用打结料打结,这种炉子更要注意烘炉时的水分多少。 c.有的打结的透热炉在使用一段时间后,打结料会出现微小的缝隙,此时如果感应器绝缘没有处理好,就会有少量的氧化皮进入感应圈的匝间,造成匝间短路,易产生过流现象。****感应器线圈用云母带缠绕再浸漆、烘干,最后打结