CHIRTSOV, A., P. RIPKA, and V. GRIM. Three-Phase Busbar Current Transducer. IEEE Magnetics Letters. 2019, 10(1), ISSN 1949-307X. DOI 10.1109/LMAG.2019.2957257.
A true three-phase 1000 A busbar current transducer is based on six micro-fluxgate sensors. Instead of using
three independent single-phase current transducers, we use the full information from each sensor. Two TI DRV425 microfluxgate
sensors are inserted into a hole drilled in each busbar. Our method of data processing is optimized to compensate
the crosstalk between the three phases and external fields and gradients up to second order. The crosstalk error between
the phases was 0.23% or smaller. The suppression of field from an external current at a distance of 10 cm is improved by
a factor of 25 to 150. Our transducer has compact size, high temperature offset stability of 8.5 mA/°C, high current range
up to 1000 A, low power consumption, and linearity of 0.1%. The results from a three-dimensional finite-element model
and analytical computations confirm the measurements
