【摘要】 本文在分析变压器铁芯电磁特性及其动态磁化过程的基础上,运用不同函数分段拟合磁化回线和动态曲线压缩的方法,建立了计及铁芯饱和、磁滞、局部磁滞和原始剩磁影响的单相变压器励磁涌流仿真模型,开发了仿真计算程序,并对单相变压器空载合闸时的励磁涌流作了仿真计算。仿真结果表明:该模型全面准确地描述了变压器暂态过程中的真实状态,方便地解决了铁芯饱和后的磁化曲线易于拟合成负斜率的问题。同时运用该模型还仿真研究了影响变压器励磁涌流的各种因素,并对仿真所得涌流作了间断角和二次谐波含量分析,以便为电力变压器设计和继电保护装置可靠动作提供参考依据。更多还原

【Abstract】 Based on analysing the dynamic magnetization performance of iron core of transformer, a newly developed single-phase model for simulation of magnetizing inrush current is built by means of piecewise curve fitting of different functions and curve compressing. The effects of magnetic saturation, hysteresis, dynanmic hysteresis loops and original residual magnetism are considered, and the program for simulating the magnetizing inrush current in single - phase transformer with no-load switching is developed. The results of simulation shows that this model can accurately describe the real condition of transformer in transient process and conveniently solve the problem that the saturated B - H curve is easy to be fitted as negative inclined coefficient curve. All kinds of factors effecting magnetizing inrush current are also analysed in order to provide reliable reference for designing transformers and for setecting and setting protective relaying equipment.更多还原