TP53 - A Shunt Based Low Frequency Current Sensing Approach at an Earthing Switch for Power Grid Applications
- Event
- EUROSENSORS XXXVII
2025-09-07 - 2025-09-10
Wroclaw - Band
- Poster II
- Chapter
- Sensors for Automation and Industry
- Author(s)
- A. Elsässer, M. Neumayer, B. Schweighofer, T. Bretterklieber, F. Grubinger, H. Wegleiter - Institute of Electrical Measurement and Sensor Systems, Graz (Austria), P. Schachinger - Austrian Power Grid AG, Vienna (Austria)
- Pages
- 462 - 463
- DOI
- 10.5162/EUROSENSORS2025/TP53
- ISBN
- 978-3-910600-07-2
- Price
- free
Abstract
Low frequency currents (LFCs) in the power grid, typically caused by geomagnetic disturbances orman-made sources, can lead to transformer saturation and grid instabilities. This work presents a shunt basedmeasurement approach using an existing earthing switch as a sensing element. Due to the low and temperature-dependent resistance of the switch, an inline calibration method is introduced to determine the shunt sensitivityduring operation. A custom test bench simulates realistic current signals and validates the concept. The resultingsystem achieves an estimated measurement uncertainty of 20 mA, primarily limited by thermoelectric effects. Thisapproach offers a robust and low-complexity alternative for monitoring LFCs in high-voltage environments.