测量用电流互感器铁芯材料对剩磁的影响

摘要

Aiming at residual magnetism problem, this paper analyzed the residual magnetism and its influence caused by transformers. Dif-ferent materials (silicon steel plate, permalloy, super micro crystal alloy) were taken to make iron core for simulation moulding in EMTP-ATP software, so as to get current waveform diagram. Current waveform at secondary side was guided into RMS module in Simulation of Matlab to carry out calculation and to make comparison of difference for the three materials. Simulation results show that permalloy is the minimum in error and silicon steel plate is the maximum in error.%　　针对剩磁问题分析了电流互感器产生剩磁的原因和剩磁所造成的影响，分别采用不同材料(硅钢片、坡莫合金、超微晶合金)做铁芯在EMTP-ATP中建模仿真，得出电流波形图。将有无剩磁情况下的二次侧电流波形分别导入MATLAB/SIMULINK软件的RMS模块进行计算，比较三种材料的相差和比差。仿真结果表明，坡莫合金误差最小，硅钢片误差最大。