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电网技术  2014 

直流偏磁对计量用电流互感器的性能影响分析

DOI: 10.13335/j.1000-3673.pst.2014.05.044, PP. 1408-1413

Keywords: 直流偏磁,电流互感器,磁导率,误差,谐波

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Abstract:

通过电流互感器(currenttransformer,CT)的T型等效模型推导出了计量用CT的误差与铁芯磁导率之间的关系,并通过铁磁性能实验得到了在直流偏磁下电感与铁芯磁导率之间的变化规律。设计交直流混合实验方法模拟真实的直流偏磁现象,通过实验数据分析直流偏磁对计量用CT误差的影响。结果表明,直流偏磁没有改变铁芯饱和特性,随着直流偏置量的增加,比差整体往负方向偏移,角差整体往正方向偏移,CT二次侧的谐波分量增加,偶数次谐波分量的增加尤为明显。

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