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TitleEffects of system characteristics on geomagnetically induced currents
AuthorZheng, K; Boteler, D H; Pirjola, R J; Liu, L -G; Becker, R; Marti, L; Boutilier, S; Guillon, S
SourceIEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers) vol. 29, no. 2, 2014 p. 891-898,
Alt SeriesEarth Sciences Sector, Contribution Series 20140022
Mediapaper; on-line; digital
File formatpdf
Subjectsgeophysics; geomagnetism; geomagnetic fields; geomagnetic variations; electric power
Illustrationsplots; tables; graphs
ProgramNorthern Canada Geohazards Project, Public Safety Geoscience
AbstractThe geomagnetically induced currents (GICs) produced in power systems during magnetic storms are a function of the electric-field amplitude and direction, and the characteristics of the power system. This paper examines the influence of a number of power system characteristics, which include the resistances and structures of the conductors; the length of the transmission lines; the number, type, and resistances of transformers, the substation grounding resistances, and the topology of the network. It is shown that GIC grows with increasing line length but approaches an asymptotic constant value, and a more relevant parameter than the individual line length is the length of the entire system. This paper also derives the effective GIC for a conventional transformer and an autotransformer, and analyzes the behavior of GIC when the network topology changes illustrated with the GIC-Benchmark Model. The results of these studies provide a guide to estimating GIC impacts on a power network.
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, satellites, radio communications and GNSS positioning to help Canadian industry understand and mitigate the effects of space weather. This paper describes how the system characteristics affect the geomagnetically induced currents that can be a hazard to power systems.