Work

Detection of geomagnetically induced currents on single phases in power grids using a fiber optic current sensor system

Year: 2026

Type: article

Abstract: Power transformers are an integral part of our electric power system. Parasitic direct currents in the alternating-current grid cause inefficient transformer operation and demand mitigation measures to protect the grid’s constituents. In particular, geomagnetically induced currents (GICs) arising from solar activity prove to be an unpredictable risk for grid operators. Within this paper, we present an interferometric fiber-optic current sensor system designed for long-term monitoring of GICs, allowing fully remote sensor control and data access. The developed sensor possesses a noise-limited threshold sensitivity of 2.64 mA Hz-1. We successfully demonstrate the first optical measurement of GICs on a single phase of the power grid during two distinct geomagnetic events, on both the low-voltage and the high-voltage sides.

Source: Journal of sensors and sensor systems

DOI: 10.5194/jsss-15-1-2026

Authors: Johannes Mandl, Philipp Trampitsch, Alexander Fröhlich, Reinhard Klambauer, Alexander Bergmann

Institution: Graz University of Technology

Language: English

Topic: Magnetic Field Sensors Techniques

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $679