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SPACE WEATHER,
VOL. 7,
S03002,
11 PP., 2009
doi:10.1029/2008SW000417
Measurements of geomagnetically induced current in a power grid in Hokkaido, Japan
National Institute of Information and Communications Technology, Koganei, Japan
National Institute of Information and Communications Technology, Koganei, Japan
Department of Mechanical and Electrical Engineering, Tokuyama College of Technology, Shunan, Japan
Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan
Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan
Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan
Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan
RIKEN, Wako, Japan
Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Japan
Central Research Institute of Electric Power Industry, Tokyo, Japan
Department of Research and Development, Hokkaido Electric Power Co. Inc., Ebetsu, Japan
Department of Research and Development, Hokkaido Electric Power Co. Inc., Ebetsu, Japan
There have been numerous reports showing that space weather affects power grids through a geomagnetically induced current (GIC). Generally, power grids consist of power lines connected to transformers, of which neutral points are directly grounded. The GIC flows into those transformers through the neutral points if geomagnetic variations cause a ground level potential. These currents can damage power grids, especially transformers. It has been tacitly assumed, however, that the effect of the GIC is minor in Japan because of the country's location at geomagnetically lower latitudes. To examine the GIC effect in Japan, we conducted approximately 2 years of GIC measurements in Hokkaido, Japan. It is found that GICs associated with substorms can be detected in Japan even at the solar minimum although intense GICs do occur mostly during geomagnetic storms. Temporal variations of GICs show high correlation with geomagnetic field variations, rather than time derivatives of the geomagnetic field.
Received 8 June 2008; accepted 30 October 2008; published 12 March 2009.
Citation: (2009), Measurements of geomagnetically induced current in a power grid in Hokkaido, Japan, Space Weather, 7, S03002, doi:10.1029/2008SW000417.
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