6ES7138-4FB04-0AB0

在我们电工日常工作当中，面对三相五线电路接地供电网络时，不时会遇到零线带电现象！此故障现象不但严重危害用户人身，还存在停电检修耽误正常生活生产用电的问题，为此颇令我们电工从业者头痛！

      其实对于这种零线带电故障所产生的原因，总结归纳起来不外乎以下五种可能：

      一、用电线路中的用电设备的确存在绝缘破损引发的漏电故障，而由于各种原因漏电保护装置未动作，造成此种情况发生；

      二、电网中有一相发生接地故障，可是由于线路当中的保护装置因动作整定值不当或者机构失灵等原因而拒动，也会出现这种情况；

      三、电路当中的零线发生断裂现象，并且断裂点后面的个别电器有漏电现象或者存在三相用电负荷不平衡的情况，同样会引发零线带电故障；

      四、变压器低压侧工作接地线同接地装置连接处，如果存在接触不良、氧化锈蚀等情况致使接地电阻超过规定值时，也极易导致出现零线带电问题；

      五、在高低压线路并存时，高压电网通过磁场感应或者静电感应窜入低压回路，同样会诱发该故障现象出现。

倍德立（厦门）科技有限公司  

销售经理:张卫东 联系电话：13055237500 座机：0592-6085900  QQ:3454941352 

销售经理：杨帆 联系电话：13358371730 座机：0592-6085900  QQ: 2921696645  

销售经理：叶工 联系电话：15359890861 座机：0592-6087118  QQ: 2650907184  

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AB（罗克韦尔）:1734/1746/ 1747/ 1756/1762系列， 承接AB罗克韦尔全系列PLC 变频器、触摸屏、软启动、伺服等业务.

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