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arXiv · 2602.09213

Real-time Load Current Monitoring of Overhead Lines Using GMR Sensors

Md Mahfuzur Rahman Chy·Md Rifat Al Amin Khan·Md Sultan Mahamud·Anwarul Islam Sifat·Fiona J. Stevens McFadden
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Abstract

Non-contact current monitoring has emerged as a prominent research focus owing to its non-intrusive characteristics and low maintenance requirements. However, while they offer high sensitivity, contactless sensors necessitate sophisticated design methodologies and thorough experimental validation. In this study, a Giant Magneto-Resistance (GMR) sensor is employed to monitor the instantaneous currents of a three-phase 400-volt overhead line, and its performance is evaluated against that of a conventional contact-based Hall effect sensor. A mathematical framework is developed to calculate current from the measured magnetic field signals. Furthermore, a MATLAB-based dashboard is implemented to enable real-time visualization of current measurements from both sensors under linear and non-linear load conditions. The GMR current sensor achieved a relative accuracy of 64.64% to 91.49%, with most phases above 80%. Identified improvements over this are possible, indicating that the sensing method has potential as a basis for calculating phase currents.

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Md Mahfuzur Rahman Chy, Md Rifat Al Amin Khan, Md Sultan Mahamud, Anwarul Islam Sifat, Fiona J. Stevens McFadden. 2026-02-09. Real-time Load Current Monitoring of Overhead Lines Using GMR Sensors. https://doi.org/10.1109/td48022.2026.11562453

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