J. Space Weather Space Clim.
Volume 4, 2014
Space Weather and Challenges for Modern Society
|Number of page(s)||7|
|Published online||09 January 2014|
Observations and modeling of GIC in the Chinese large-scale high-voltage power networks
School of Electrical and Electronic Engineering, North China Electric Power University, Beijing, China
2 Geomagnetic Laboratory, Natural Resources Canada, Ottawa, Canada
3 Finnish Meteorological Institute, Helsinki, Finland
Accepted: 17 December 2013
During geomagnetic storms, the geomagnetically induced currents (GIC) cause bias fluxes in transformers, resulting in half-cycle saturation. Severely distorted exciting currents, which contain significant amounts of harmonics, threaten the safe operation of equipment and even the whole power system. In this paper, we compare GIC data measured in transformer neutrals and magnetic recordings in China, and show that the GIC amplitudes can be quite large even in mid-low latitude areas. The GIC in the Chinese Northwest 750 kV Power Grid are modeled based on the plane wave assumption. The results show that GIC flowing in some transformers exceed 30 A/phase during strong geomagnetic storms. GIC are thus not only a high-latitude problem but networks in middle and low latitudes can be impacted as well, which needs careful attention.
Key words: electric circuit / geomagnetically induced currents (GIC) / modelling / engineering / space weather
© C. Liu et al., Published by EDP Sciences 2014
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.