海陽核電主變壓器中性點直流偏磁抑制措施的研究
宋光耀
（山東核電有限公司，山東 煙臺 265116）
摘 要：實地測量和數據分析表明，海陽核電1 號機組主變噪音及振動超標與直流偏磁具有明顯的正相關性。闡述了抑制直流偏磁的方法，提出了中性點增設電容型隔直裝置的方案及隔直裝置的選型原則。通過對主變中性點絕緣水平、系統繼電保護、系統過電壓三方面進行分析，說明主變中性點增設容抗為0.51Ω的隔直裝置后，解決了變壓器直流偏磁問題，且不會對現有電網系統的安全運行產生負面影響。
關鍵詞：直流偏磁；主變中性點；隔直裝置；絕緣水平校核
中圖分類號：TM613 文獻標識碼：B 文章編號：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
參考文獻
[1] DL/T 620—1997 交流電氣裝置的過電壓保護和絕緣配合[S].
[2] 朱藝穎，蔣衛平，曾昭華，等. 抑制流過嶺澳和大亞灣核電站主變中性點直流電流措施的研究[J].中國電機工程學報，2005，25(13)：1-7.
