Novel rectangular yokeless current transducer with the range 400 A using 16 microfluxgate sensors around the busbar conductor is presented in this paper. Compared to yokeless transducers utilizing the differential pair of magnetic sensors, our solution has much better suppression of the external currents (lower crosstalk). Compared to industrial transducers with yoke, the new transducer has 15-times lower noise, 7-times better temperature stability, and same crosstalk. Sensor design and design of current monitoring system is presented together with the results of long-term field tests. Crosstalk error is examined in dependence on the number of the operating sensors and external current position.

Department of Measurement Faculty of Electrical Engineering Czech Technical University Prague 16627 Prague 6 Czech Republic

Institute of Geophysics of the Czech Academy of Sciences 14131 Prague 4 Czech Republic

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Rectangular Array Electric Current Transducer with Integrated Fluxgate Sensors