Abstract

We propose improved contactless DC/AC current transducer for 3-phase current lines based on 8 integrated fluxgate sensors. Using proper processing we ideally achieve a complete suppression of external homogeneous fields, and field gradients up to the 4th order. The sensitivity to external currents (crosstalk) is improved 15-times compared to [1]. The usage of micro fluxgate sensors instead of magnetoresistive sensors improves the temperature stability: the sensitivity temperature coefficient was reduced from 0.3%/K to 50 ppm/K and offset drift was reduced from 50 mA/K to 1 mA/K.

Highlights

  • IntroductionSmart grids need precise information of electric current including its DC component

  • Smart grids need precise information of electric current including its DC component.Lightweight transducers which can be mounted to the existing power lines are required

  • Six-sensor arrangement with polynomial estimation in theory provides results better than gradient method, our setup was limited to configuration from Figure 1b, and we could not do direct comparison with [1]

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Summary

Introduction

Smart grids need precise information of electric current including its DC component. Lightweight transducers which can be mounted to the existing power lines are required. Magnetic cores and yokes are too heavy. While Rogowski coils cannot measure DC component and they have limited frequency range, yokeless magnetic sensors have good potential for this application [2]. Circular or rectangular multisensor arrays closely approximate the Ampere’s law and they effectively suppress the external currents [3]. Their disadvantage that they need large number of sensors, at least 8 per phase

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