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TitleCalculation of GIC in Bulk Power Systems
AuthorHorton, R; Boteler, D H
SourceProceedings, CIGRE US Grid of the Future Symposium; 2013 p. 1-6
Year2013
Alt SeriesEarth Sciences Sector, Contribution Series 20130461
PublisherCIGRE US
MeetingCIGRE US Grid of the Future Symposium; Boston; US; October 20-22, 2013
Documentbook
Lang.English
Mediapaper
File formatpdf
Subjectsgeophysics; engineering geology; pipeline feasibility studies; pipelines; geomagnetism; geomagnetic fields; geomagnetic variations; magnetic disturbances; magnetic field; magnetic storms
Illustrationsdiagrams
ProgramNorthern Canada Geohazards Project, Public Safety Geoscience
AbstractDuring geomagnetic disturbances, magnetic field variations drive low frequency electric currents along transmission lines and through transformer windings to ground wherever there is a path for them to flow. GIC are considered quasi-dc because of their low frequency (typically on the order of mHz) relative to the power frequency; thus, from a power system modeling perspective can be considered dc. The flow of these quasi-dc currents in transformer windings causes half-cycle saturation of transformer cores which leads to increased transformer hotspot heating, harmonic generation and reactive power loss, each of which can affect system reliability. Assessment of the geomagnetic hazard requires accurate modeling of the GIC that are expected to occur during a given geomagnetic disturbance (GMD). This paper serves as a primer for calculating geo-electric fields, developing the appropriate system model and computing GIC in bulk power systems.
Summary(Plain Language Summary, not published)
Space weather refers to the dynamic conditions on the Sun and in the space environment, in particular, in the near-Earth environment, that can affect critical infrastructure. NRCan operates the Canadian Space Weather Forecast Centre and conducts research into space weather effects on power systems, pipelines, radio communications and GNSS positioning to help Canadian industry understand and mitigate the effects of space weather. Assessment of geomagnetic hazard requires accurate modeling of the geomagnetically induced currents (GIC) that are expected to occur during a given geomagnetic disturbance (GMD). This paper serves as a primer for calculating geo-electric fields, developing the appropriate system model and computing GIC in bulk power systems.
GEOSCAN ID293665