电流互感器复合误差测量与校验

Composite Error Measurement and Verification of Current Transformer

概述了电流互感器复合误差对微机保护装置的影响,介绍了复合误差的直接测量法和间接测量法,叙述了电流互感器伏安特性曲线与误差曲线的绘制方法。针对目前变电站电流互感器误差校验中使用的拐点电压法,指出其不足,并提出根据电流互感器参数计算励磁电流,对应实测励磁电压的方法,实例核算效果良好。

The influence of the current transformer composite error on the microcomputer protection device was summarized.The direct measurement method and the indirect measurement method of the composite error were introduced.The method of drawing the volt-ampere characteristic curve and error curve of the current transformer,and the quadratic limit electromotive force method were discussed.Aiming at the inflection point voltage method used in the current transformer current transformer error verification,its deficiencies were pointed out,and a method for calculating the excitation current based on the current transformer parameters and corresponding to the measured excitation voltage was proposed.The example calculation results were good.