摘要
内蒙古某地区±500 k V直流输电线路在单极运行方式并采用大地作为回线的情况下,附近E发电厂内运行的2号主变压器产生严重的直流偏磁现象。通过测试2号主变压器的直流电流、噪声、振动情况,发现主变压器中性点直流电流、噪声、振动均超过标准要求,影响变压器的正常运行。从现场实际应用效果和技术、经济性等方面对各种解决方案进行分析对比,建议采用电容隔直法对2台主变压器中性点进行技术改造,保证变压器安全稳定运行。
In a region of Inner Mongolia, ＋500 kV dc iransmission line under tile condition of monopole operation mode and taking the earth as a loop, DC magnetic bias occured in main transformer 2 in near E power plant. The test to Dc current, noise and vibration of the main transformer 2 showed that the DC current in transformer neutral point, noise and vibration exceeded the standard requirements, which has disadvantageous affect on the normal operation of transformer. As well as technical and economic aspects of the various solutions DC bias of schemes are compared, it is recommended blocking capacitor method for two main transformer neutral point for technological innovation, to ensure the safe and stable operation of the transformer.
出处
《内蒙古电力技术》
2015年第3期89-91,95,共4页
Inner Mongolia Electric Power
关键词
直流输电线路
主变压器
直流偏磁
电容隔直法
变压器中性点
direct current transmission line
main transformer
DC Bias
Capacitanceseparation method
transformer neutral point
