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Open AccessArticle

Study of Current Measurement Method Based on Circular Magnetic Field Sensing Array

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College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China
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Hubei Provincial Collaborative Innovation Center for New Energy Microgrid, China Three Gorges University, Yichang 443002, China
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School of Electronic and Information Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
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Electrical and Computer Engineering Department, Curtin University, Perth 6000, WA, Australia
*
Author to whom correspondence should be addressed.
Sensors 2018, 18(5), 1439; https://doi.org/10.3390/s18051439
Received: 9 April 2018 / Revised: 2 May 2018 / Accepted: 3 May 2018 / Published: 5 May 2018
(This article belongs to the Section Intelligent Sensors)
Classic core-based instrument transformers are more prone to magnetic saturation. This affects the measurement accuracy of such transformers and limits their applications in measuring large direct current (DC). Moreover, protection and control systems may exhibit malfunctions due to such measurement errors. This paper presents a more accurate method for current measurement based on a circular magnetic field sensing array. The proposed measurement approach utilizes multiple hall sensors that are evenly distributed on a circle. The average value of all hall sensors is regarded as the final measurement. The calculation model is established in the case of magnetic field interference of the parallel wire, and the simulation results show that the error decreases significantly when the number of hall sensors n is greater than 8. The measurement error is less than 0.06% when the wire spacing is greater than 2.5 times the radius of the sensor array. A simulation study on the off-center primary conductor is conducted, and a kind of hall sensor compensation method is adopted to improve the accuracy. The simulation and test results indicate that the measurement error of the system is less than 0.1%. View Full-Text
Keywords: circular array; magnetic field sensor; current measurement; magnetic interference circular array; magnetic field sensor; current measurement; magnetic interference
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MDPI and ACS Style

Li, Z.; Zhang, S.; Wu, Z.; Abu-Siada, A.; Tao, Y. Study of Current Measurement Method Based on Circular Magnetic Field Sensing Array. Sensors 2018, 18, 1439.

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