蒙东地区变压器直流偏磁现象检测与抑制方法

摘要

DC magnetic bias could affect the normal operation of the transformer,which is a typical phenomenon on transformer failure. Analyzed the mechanism of DC bias current on transformer,the ground current from adjacent DC power lines is the main factors.Adopt the Detection instrument of DC magnetic bias and Online monitoring system of DC magnetic bias,the DC component on neutral point of transformers are detected.The results show that DC component is generally not more than 10A of Mengdong transformers,but in this case, the normal operation of the transformer has been impact.%直流偏磁是影响变压器正常工作运行的一种典型现象。在分析变压器直流偏磁产生机理的基础上，认为直流输电系统入地电流是产生直流偏磁的主要影响因子。采用开发的直流偏磁带电测试仪和直流偏磁在线监测系统对蒙东地区的变压器中性点直流分量进行了测试。结果表明，蒙东地区变压器中性点直流分量已影响变压器的正常运行。