Rectangular Array Current Transducer with Integrated Microfluxgate Sensors

Abstract

Novel rectangular yokeless cu rrent 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 external currents (lower crosstalk). Compared to industrial transducers with yoke, the new transducer has 10-times lower noise, 10-times better temperature stability, and same crosstalk. Sensor design, different methods for calculating the current and tempe rature dependence are pre sented in this paper. Crosstalk error is examined in de pendence on the number of the operating sensors and external current position.

Contactless measurement of electric current using magnetic sensors

“…6 shows the error of a rectangular current transducer caused by the external current, if 8, 10 or all 16 sensors are employed. A rectangular array of microfluxgates performs better than an industrial transducer based on an uncompensated Hall sensor in the airgap of a ferromagnetic core [88].…”

“…A sensor based on a circular array of microfluxgate sensors was described in [87]. We have developed a similar transducer of rectangular shape [88]. The sensor location and also the magnetic field lines around the rectangular busbar are shown in Fig.…”

“…Rectangular current transducer -location of the sensors[88] Fig 6. prototype of the rectangular current transducer using 16 microfluxgate sensors around the measured conductor[88] Error of the rectangular current transducer caused by external current , if 8, 10 or all 16 sensors are employed [88]. …”

Flexible-substrate Fluxgate Current Sensor Based on MEMS Technology

“…(24,25) Rectangular and circular fluxgate current sensor arrays are used to measure the current, and it has been shown that the more sensors used, the higher the measurement accuracy. (26,27) However, because the range of measurement is limited by the measured distance, they cannot measure a large current. Therefore, a measurement method involving a sensor chip inside a busbar provides a practical solution in which the distance between two sensors can be adjusted to expand the measurement range and improve the measurement accuracy because of the use of multiple sensors.…”

Rectangular Array Electric Current Transducer with Integrated Fluxgate Sensors

“…In this paper we describe a novel rectangular yokeless current transducer using microfluxgate sensors. This concept was first introduced in [16]. We compare the performance of our new transducer with the commercially available sensor HOP 800-SB by LEM, which is based on the uncompensated Hall sensor in the airgap of the rectangular yoke.…”