电流互感器暂态时域仿真

在分析电流互感器暂态特性及其动态磁化过程的基础上，利用不同函数分 段拟合磁化曲线和曲线压缩的方法，建立了计及铁心饱和、磁滞、局部磁滞及 原始剩磁影响的电流互感器暂态时域仿真模型，并开发了仿真计算程序。利用 该程序计算了电流互感器在电力系统故障暂态电流作用下的暂态过程。计算和 实验所得波形相一致。仿真结果说明，该模型方便地克服了铁心饱和后的磁化 曲线易于拟合成负斜率的问题，能够全面准确地描述、模拟电流互感器暂态过 程中的真实状况。

SIMULATION OF TRANSIENT IN CURRENT TRANSFORMER

ased on analizing the dynamic magnetization performance of currenat transformerCT).a newly developed CT model for transient simulation is built by means of piecewise curve fitting of different functions and curve compressing.the effects of magnetic saturation. hystere-sis, dynamic hysteresis loops and its original residual magnetism are considered, and the simula-tion program is developed. According to this program, the transient process in CT under the in-fluence of transient current arising from faulted power system are examined . The simulation re-sults are in conformity with field tests. It shows that this model can conveniently overcome the contradiction that the saturated B H curve is easy to be fitted as negative inclined coefficient curve.