变压器铁心磁耦合下非线性特性曲线的研究  

Study of Nonlinear Characteristic Curve for the Core of Transformer with Magnetic Coupling

作　　者：李晓萍[1] 文习山[1] 陈慈萱[1] 樊亚东[1] 

机构地区：[1]武汉大学电气工程学院,武汉430072

出　　处：《高电压技术》2005年第12期9-11,共3页High Voltage Engineering

摘　　要：利用准稳态下的麦克斯韦方程,分析出变压器无磁耦合(如单相变压器)时磁通φ和励磁电流i的非线性-φi曲线与铁心材料的磁密B和磁场强度H的非线性B-H曲线相似,并推导出有磁耦合(如三相变压器)时-φi表达式与B-H曲线间的关系。结果表明,结构对称的三相三柱和四柱变压器每柱的-φi曲线是铁磁材料B-H曲线的尺度变换;不对称三相变压器两曲线有合理的转换关系。Nonlinear characteristics for the core of transformer is very important in computing exciting current or etc. a few of articles utilize improperly the nonlinear characteristic. For example, φ-i curve is regarded to be conformable to B-H curve regardless whether magnetic coupling exists in the core. This paper discusses the relationship of the two kinds of curves for different structural transformer. Conclusions are drawn that the B-H curve is similar to φi curve for single-phase transformer, the φi curve for symmetrical three-phase transformer is multiple B-H curve. The relationship of two kinds of curves for asymmetric three-phase transformer is deduced in this paper.

关 键 词：变压器铁心 B-H曲线 φ-i曲线 

分 类 号：TM401[电气工程—电器]