用保凸的三次样条函数拟合电流互感器主磁滞回环

AN IMITATIVE METHOD FOR CT MAJOR HYSTERISIS LOOPS BY USING THE CONVER￣PRESERVING CUBIC SPLINE FUNCTION

电流互感器的主磁滞回环的拟合在电流互感器的仿真计算中意义很大，围绕拟合的精度与光滑性的矛盾，已提出不少的方法。提出的一种运用保凸三次样条函数进行主磁滞回环的拟合方法，曲线光滑、精度高，而且还克服了一般三次样条函数拟合出现端点的不合理波动现象。

he imitation of the current transformer (CT) major hysteresis loops is very important for the simulation calculation of the current transformer. A method using the convex-preserving cubic spline function to imitate the major hysteresis loops of the currenttransformers is proposed in this paper. Based on the normal cubic spline function, themethod imitates the loops with convex-presrving, which makes sure of the convexity andconcavity of the loops imitated in each quadrant. The loops imitated are more smooth andmore precise than by the normal cubic spline function method.