摘要
在直流偏磁条件下变压器励磁电流是研究变压器直流偏磁特性的关键。针对两种直流量引入方法,即直流量与正弦电压激励同侧引入和直流量与正弦电压激励异侧引入,通过实验结合数值计算,分析了两种引入直流量方法本质的区别及原因。研究结果表明:同侧引入直流电流比异侧引入直流电流更能准确地反映地磁感应电流或直流输电线路单极运行引起的变压器直流偏磁问题。其次,分析了直流偏磁对变压器励磁电流的有效值、直流分量及各次谐波影响的规律。最后,应用改进的磁路-电路耦合时域方法分析了直流偏磁下变压器的励磁电流,计算结果与测量结果吻合。本工作为研究变压器的直流偏磁问题打下了基础。
It is the key problem for studying the exciting current in the transformer under DC bias magnetization. Firstly, based on two methods of injecting DC bias, i. e. DC bias induced from the same side as sinusoidal voltage excitation and from the other side, the differences of the two methods and the reasons were studied by means of experiments and calculations. The results proved that DC bias induced from the same side as sinusoidal voltage excitation was more correct than the other method to reflect geomagnetically induced currents （GIC） and DC bias magnetization problems arose by the monopole operation in HVDC system. Secondly, we analyzed the effect of DC bias on the root-mean-square quantity, DC components and harmonic components of transformer exciting current. At last, the exciting currents of transformer under DC bias were calculated by utilizing of the improved magnetic circuit-electrical circuit coupled time domain method. The calculated results were in good agreement with the measured results. The work in the paper may set up a foundation for studying the transformer under DC bias magnetization.
出处
《华北电力大学学报（自然科学版）》
CAS
北大核心
2007年第4期1-6,共6页
Journal of North China Electric Power University：Natural Science Edition
基金
国家自然科学基金资助项目(50677016)
河北省自然科学基金资助项目(E2006000772)
关键词
变压器
直流偏磁
励磁电流
实验
transformer
DC bias magnetization
exciting current
experiments
作者简介
李慧奇（1970-），男，华北电力大学电力工程系副教授，博士研究生；
崔翔（1960-），男，华北电力大学电力工程系教授，博士生导师，主要从事电磁场理论及其应用、电力系统电磁兼容和光纤传感技术等方向的研究工作。
