电流互感器复合误差的数字仿真分析

电流互感器复合误差的计算与分析是提高获取电力系统运行信息精度的重要内容，文章在对电流互感器磁化特性建立合理数学模型的基础上，编制了相应的仿真软件来分析复合误差，开发出电流互感器暂态仿真程序CTTS，CTTS不仅能更具体地揭示磁化全过程，把握高次谐波分量的大小和分布，还能得到磁化过程中各种电流的实际波形和大小。该程序的基本功能包括：磁化特性曲线的拟合，磁化特性数据库的管理，暂态特性的仿真计算，复合误差分析，谐波分析等，分析方法及分析结果可为继电保护的整定设计（如方向保护，差动保护差）提供有效的手段，可辅完成直接试验法的测量任务，还可用于产品的优化设计。

DIGITAL SIMULATION FOR COMPOSITE ERRORS OF CURRENT TRANSFORMER

The calculation and analysis of composite errors of current transformer (CT) is an important content to improve theaccuracy of acquired operational information of power system. On the basis of establishing reasonable mathematical model ofmagnetizing characteristic of CT, simulation software ispro-grammed to analyze composite errors and a digital CT transient simulation software package by name of CTTS is developed. Not only the full process of magnetization can be concretely revealed to grasp the magnitude and distribution of harmonic components, but also the practical waveforms and magnitudes of various currents in magnetizing process can be obtained. The basic functions of thesoftware package are as follows: the analogizing of magnetizingcharacteristic, the management of magnetizing characteristicdatabase, the simulation calculation of transient characteristics, the analysis of composite errors and harmonic analysis, etc. Thisanalyzing method and its results of analysis can provide effective means for the design of the settings of protective relaying,( e.g., the directional protection and the differential protection) assisting themeasurement in the direct testing and also to be applied to theoptimization of CT design.