直流偏磁对计量用电流互感器的性能影响分析

发布时间：2018-11-03 15:31

【摘要】：通过电流互感器(current transformer,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。
[Abstract]:Based on the T-type equivalent model of current transformer (current transformer,CT), the relationship between the error of metrological CT and the permeability of iron core is derived, and the variation law between inductance and permeability of core under DC bias magnetic field is obtained by ferromagnetic energy experiment. A hybrid AC / DC experiment method was designed to simulate the real DC bias phenomenon. The effect of DC bias on the CT error was analyzed through the experimental data. The results show that DC bias does not change the saturation characteristics of the core. With the increase of DC bias, the ratio shifts to the negative direction, the angular difference moves to the positive direction, and the harmonic component of the second side of the CT increases. The increase of even harmonic components is especially obvious.
【作者单位】：输配电装备及系统安全与新技术国家重点实验室(重庆大学);四川省电力公司计量中心;
【基金】：国家电网公司科技项目(GY17-12-016)~~
【分类号】：TM452

【参考文献】