金中水电送广西直流输电工程引起的直流偏磁影响及措施初探  

Influence of DC Bias Caused by DC Transmission Project from Jinshajiang River to Guangxi Grid and Countermeasures

作　　者：张婧[1] 李木华[2] 

机构地区：[1]广西电力工业勘察设计研究院,广西南宁530023 [2]黄冈供电公司,湖北黄冈438000

出　　处：《红水河》2011年第4期62-64,73,共4页Hongshui River

摘　　要："十二五"期间金中水电以直流输电的方式送广西300 MW,当直流输电系统以单极大地回线方式运行时,直流电流会对附近中性点直接接地的变压器产生较大的偏磁影响,危害变压器的安全运行。文中首先简要介绍了直流输电引起的变压器直流偏磁的形成机理及其对变压器的危害,然后总结了直流偏磁的抑制措施,最后结合金中水电送广西直流工程,对广西电网应对直流偏磁进行了初步探讨。During the Twelfth Five-year Plan period, the hydropower of the Jinshajiang River will send 3000MW to Guangxi grid by DC. When HVDC system works in monopole, DC may induce DC bias of transformer directly grounded at neutral point nearby, which will endanger the safe operation of transformer. The paper introduces the formation mechanism of DC bias and hazard to the transformer, and summarizes countermeasures. For DC projects of Guangxi grid in the future, a preliminary study on countermeasures against DC bias is presented.

关 键 词：高压直流输电 中性点接地变压器 直流偏磁 抑制措施 

分 类 号：TM862[电气工程—高电压与绝缘技术]