An AMR-Based Three-Phase Current Sensor for Smart Grid Applications

Improved 3-Phase Current Transducer

“…Six-sensor arrangement with polynomial estimation in theory provides results better than gradient method, however our setup was limited to configuration from Figure 1b, and therefore we could not do direct comparison with [1]. When comparing results of simulation, our new method of polynomial estimation provides advantage over both simple (Section 2.1) and gradient (Section 2.2) method.…”

“…Using proper processing of 6 sensors we ideally achieve a complete suppression of external homogeneous fields, first and second order gradients and compensation of the crosstalk between the phases. However the sensitivity to the external currents (crosstalk error) is only mildly improved from the results in [1]. Dramatic improvement can be achieved by increasing the number of sensors to 8, which allows suppression of all gradients up to 4th order and reduces the crosstalk error 15-times.…”

“…More elaborate approach was presented in [1], which uses pairs of closely spaced sensors ( Figure 1b) to obtain the gradient of H, which is then used to reconstruct values of phase currents, while greatly increasing rejection of field from other phases and external sources. Our simulation however did not confirm any improvement over naïve case from Section 2.1.…”

“…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.…”

A Smart Energy Meter Enabling Self-Demand Response of Consumers in Smart Cities of Tamil Nadu

“…A power meter with consumer side load management was attempted in [19]. Three-phase smart sensors for SG applications are proposed in [20], [21] with emphasis on accuracy of estimation of key parameters. Furthermore, a review on sensing technologies and role of IoT for next generation power grids are given in [22].…”