海阳核电主变压器中性点直流偏磁抑制措施的研究
 

宋光耀
（山东核电有限公司，山东 烟台 265116）
 

    摘 要：实地测量和数据分析表明，海阳核电1 号机组主变噪音及振动超标与直流偏磁具有明显的正相关性。阐述了抑制直流偏磁的方法，提出了中性点增设电容型隔直装置的方案及隔直装置的选型原则。通过对主变中性点绝缘水平、系统继电保护、系统过电压三方面进行分析，说明主变中性点增设容抗为0.51Ω的隔直装置后，解决了变压器直流偏磁问题，且不会对现有电网系统的安全运行产生负面影响。
    关键词：直流偏磁；主变中性点；隔直装置；绝缘水平校核
    中图分类号：TM613     文献标识码：B     文章编号：1007-3175(2017)02-0043-04
 

Research on Direct Current Magnetic Bias Suppressing Measures of
Haiyang Nuclear Power Main Transformer Neutral Point

 

SONG Guang-yao
（Shandong Nuclear Power Company Ltd, Yantai 26511 6, China）
 

    Abstract: The field measurement and data analysis show that it has the positive correlation between the noises and vibration of Haiyang nuclear power 1# Unit main transformer and the direct current (DC) magnetic bias. This paper expounded the method of suppressing the direct current (DC) magnetic bias and proposed the neutral point addition capacitive type direct current blocking device scheme and the type selection principle of direct current blocking device. By analyzing the impact of the main transformer neutral point insulation level, system relay protection and system over-voltage, the problem of transformer DC magnetic bias could be solved after adding 0.51 Ω capacitive reactance DC blocking device at the side of main transformer neutral point. Meanwhile, there is no negative influence on the safe operation of the existing power grid.
    Key words: direct current magnetic bias; main transformer neutral point; direct current blocking device; insulation level verification
 

参考文献
[1] DL/T 620—1997 交流电气装置的过电压保护和绝缘配合[S].
[2] 朱艺颖，蒋卫平，曾昭华，等. 抑制流过岭澳和大亚湾核电站主变中性点直流电流措施的研究[J].中国电机工程学报，2005，25(13)：1-7.