Rogowski Coil with Ferromagnetic Core for Precise Monitoring of Low-frequency Currents

V. Grim, P. Ripka, K. Draxler, M. Mirzaei
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Abstract

Sensitivity of precise Rogowski coils can be increased by using low-permeability magnetic core instead of air core. This allows to increase the resolution for small current values. We have studied an impact of cores with µr = 14 and 26 on linearity, frequency dependence, crosstalk from external currents and sensitivity to misplacement of the measured current. Both 3D FEM simulations and measurement were used. While we found negligible effect on crosstalk and resistance to misplacement and also on frequency characteristics, the linearity was significantly degraded. However, the linearity error in case of µr = 14, 80 mm diameter Rogowski coil with 1000 A range is still below 0.2 %, which is sufficient for energy meters.
用于低频电流精确监测的Rogowski铁磁线圈
采用低磁导率磁芯代替空芯,可以提高精密Rogowski线圈的灵敏度。这样可以增加小电流值的分辨率。我们研究了µr = 14和26的磁芯对线性度、频率依赖性、外部电流串扰和对测量电流错位的灵敏度的影响。采用三维有限元模拟和测量相结合的方法。虽然我们发现对串扰和抗错位以及频率特性的影响可以忽略不计,但线性度明显下降。然而,在µr = 14,80 mm直径Rogowski线圈具有1000 A范围的情况下,线性误差仍然低于0.2%,这对于电能表来说已经足够了。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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