变压器直流偏磁抑制措施的研究进展  

Research Progress on Suppression Measures of Transformer DC Bias

作　　者：蒋伟[1,2] 吴广宁[2] 刘愈倬[3] 侯春青[3] 

机构地区：[1]四川电力科学研究院,四川成都610072 [2]西南交通大学电气工程学院,四川成都610031 [3]山西电力科学研究院,山西太原030001

出　　处：《四川电力技术》2011年第3期9-13,共5页Sichuan Electric Power Technology

基　　金：西南交通大学博士创新基金资助项目

摘　　要：高压直流输电单极大地回路运行产生的地电流会导致变压器直流偏磁,引起变压器局部过热、振动加剧、噪声增大等不良反应。分析了抑制流入变压器中性点的直流量的3种主要措施的研究情况,即串接电容、接动态补偿装置、串接电阻。串接电阻法简单实用、经济性好,便于在直流接地极附近交流系统推广应用,指出要以整个交流电网中变压器中性点直流量不超标为目标,进行变压器接小电阻的合理配置。此外,变压器内部结构的优化设计和多条直流输电线路共用接地极也能有效地抑制直流偏磁,对相关研究中的进展和存在的问题进行了论述。HVDC transmission system who works in monopolar operation will generate neutral current that causes transformer DC bias,which will cause transformer local overheating,and increase the vibration,noise and other adverse reactions.The study situation of three main suppression methods of neutral current flowing to the transformer is analyzed,that is,series capacitance,connecting dynamic compensation device and series resistance.The series resistance method is simple,practical,economical and easy to promote the application in AC system near DC grounding electrode.It is pointed out that the aim is no limit exceeding of the DC value of the whole transformer neutral in AC grids,and the rational configuration by connecting the resistor is also proposed.In addition,the optimization design of transformer internal structure and a number of DC transmission lines sharing the same grounding electrode can suppress DC bias.The progress and the existing problems of relevant study are discussed.

关 键 词：直流偏磁 动态补偿 中性点 抑制措施 

分 类 号：TM81[电气工程—高电压与绝缘技术]