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Geomagnetically induced currents in a Norwegian transformer station

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https://hdl.handle.net/10037/26137
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Date
2022-05-11
Type
Research report
Forskningsrapport

Author
Solheim, Kristian Thinn; Mo, Olve; Johnsen, Magnar Gullikstad
Abstract
This report considers measurements of geomagnetically induced current (GIC) and comparison to recorded variations in the geomagnetic field (dB/dt). The GIC-sensors were installed in the neutral point of a 420 kV transformer located in Mid-Norway in 2019. The magnetometers (for dB/dt) are also located in Mid-Norway, but at another location. Recordings up to December 2021 are presented in this report. The maximum recorded GIC and dB/dt was about +/- 60 A and 14 nT/s, respectively. From linear regression, GIC is approximated to 3 times dB/dt, where GIC is measured in amps and dB/dt in nT/s. GIC is always lower than 7 times dB/dt based on the dataset with day-max values (699 points).
Publisher
SINTEF Nord AS
Series
SINTEF Rapport ; 2021:01449
Citation
Solheim KT, Mo O, Johnsen MG. Geomagnetically induced currents in a Norwegian transformer station. SINTEF Energi AS; 2022. 67 p.. SINTEF Rapport(2021:01449)
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