保护用电流互感器10%误差曲线校核分析

10%Error Curve Check and Analysis of Protection Current Transformer

电流互感器不仅可以根据一、二次电流与一、二次线圈匝数成反比的规律检测一次电流,还可以把大电流变换成小电流,广泛应用于电力系统的保护、测量以及计量。励磁电流的存在使电流互感器由一次电流到二次电流的变换总是存在误差。保护用电流互感器对一次电流的变换的精确度关系到电力系统继电保护动作的准确性、可靠性和电力系统的安全平稳运行。10%误差校核分析是工程应用中常用的校核保护用电流互感器误差的方法。因此,分析阐述保护用电流互感器的传变误差、10%误差曲线的定义和绘制、校核及误差改善措施,希望能够为工程实例中保护用电流互感器的误差校核和分析提供参考。

The current transformer can not only detect the primary current according to the law that the primary and secondary currents are inversely proportional to the turns of primary and secondary coils,but also transform the large current into small current,which is widely used in the protection,measurement and metering of power system.It is widely used in the protection,measurement and metering of power system.Due to the existence of excitation current,there is always error in the transformation of current transformer from primary current to secondary current.The accuracy of primary current transformation by protective current transformer is related to the accuracy and reliability of relay protection action and the safe and stable operation of power system.The 10%error check analysis is a common analysis method to check the error of current transformer for protection in engineering application.Based on this,this paper analyzes and expounds the definition,drawing,checking and error improvement measures of transmission error and 10%error curve of protection current transformer,hoping to provide some reference for error checking and analysis of protection current transformer in engineering examples.