摘要
为研究计及铁芯磁滞效应的电流互感器(TA)传变特性,提出了一种新的TA数值模型。基于J-A磁化理论推导表征铁芯励磁特性的经典J-A磁滞模型,并对经典模型存在非物理解的缺陷进行了修正,形成改进J-A磁滞模型。其次,将TA的传变特性方程与铁芯改进J-A磁滞模型相耦合,建立了TA数值模型。搭建TA传变特性的测试电路,对比分析二次电流i2的理论计算波形和实际测量波形,试验表明:改进J-A磁滞模型更准确地表征铁芯的磁滞特性。同时,TA数值模型能基本反映TA的传变特性,具备物理概念清晰、计算量小、精度较高等优点,可广泛运用于各类铁磁材料的TA建模。
A new numerical model of current transformer （TA）, which includes TA＇s hysteresis characteristics, is put forward to study TA＇s transfer characteristics. Firstly, the original brief derivation of classic J-A hysteretic model is ana- lyzed. Since there is drawback that the classic model has non-physical solution, modification equations are introduced to form a new modified J-A hysteretic model of ferromagnetic core. Then, the characteristic transfer equation of TA is in- corporated with the modified model of ferromagnetic core to construct a numerical model of TA. A test circuit is established to test TA＇s transfer characteristics; then the theoretical and measured waveforms of secondary current ie are compared and analyzed. The test verifies that the modified J-A hysteretic model is improved for describing hysteresis characteristics, while the numerical model of TA could approximately describe TA＇s transfer characteristics. The proposed numerical model of TA is advanced with its clear physical conception, less calculation workload, and high accuracy, and it can be commonly used to model different TAs made of various ferromagnetic materials.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第2期482-488,共7页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2009CB724508-1)~~
