GEOSCAN, résultats de la recherche


TitreSpace weather hazard assessment for Alberta
AuteurTrichtchenko, L; Nikitina, L; Fernberg, P
SourceCommission géologique du Canada, Dossier public 7906, 2015, 156 pages,
LiensSpace Weather Canada / Météo Spatiale Canada
ÉditeurRessources naturelles Canada
Documentdossier public
Mediaen ligne; numérique
SNRC82H; 82I; 82J; 82N; 82O; 82P; 83; 84
Lat/Long OENS-120.0000 -112.0000 56.0000 49.0000
Sujetstélédétection; perturbations magnétiques; champ magnétique; interprétations magnétiques; orages magnétiques; énergie solaire; variations solaires; géomagnétisme; champs géomagnétiques; variations géomagnétiques; variations géoélectriques; géophysique
Illustrationstables; flow charts; location maps; histograms; plots
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
ProgrammeNord du Canada, risque géoscience, Géoscience pour la sécurité publique
Diffusé2015 08 05
Résumé(Sommaire disponible en anglais seulement)
Geomagnetic disturbances produce electric fields that drive electric currents in the Earth and in power transmission networks at the Earth's surface. These geomagnetically induced currents (GIC) flow through transformer windings where they produce partial saturation of the transformer core leading to harmonic generation, increased VAR demand and transformer heating which can cause misoperation of protective relays, voltage sag and damage to equipment. In extreme cases, as in the March 13, 1989, magnetic storm, this can result in burntout transformers and system collapse.
Concern that a major geomagnetic storm could cause widespread problems on the North American power networks has prompted the North American Electric Reliability Corporation (NERC) to set up a Geomagnetic Disturbance Task Force. This is developing new rules that will require power utilities to undertake a geomagnetic hazard assessment and to take action to mitigate the risks if necessary.
The aim of this research is to understand and assess the possible geomagnetic effects on power systems, pipelines and other ground infrastructure in the province of Alberta.
The report consists of five chapters. Analysis of the geomagnetic activity based on long records of geomagnetic data at several observatories is described in Chapter 1. The geological settings and analysis of the resistivity structures based on an extensive literature review described in the Chapter 2 as well as the resulting ten earth resistivity models which cover the whole province of Alberta.
The theory on the modelling of the geoelectric fields which drives the electric currents in grounded networks is described in Chapter 3. It also presents the results of the statistical analysis of the calculated geoelectric field variations for 40 years as well as the 40-years maximum values for each particular resistivity zone of the province.
The estimated values can be used with power or pipeline network models to calculate the GIC in the power lines or pipe-to-soil potential variations for the pipelines.
Résumé(Résumé en langage clair et simple, non publié)
La météo spatiale fait référence aux conditions dynamiques du soleil et de l¿environnement spatial qui peuvent influer sur les infrastructures essentielles. RNCan exploite le Centre canadien de météo spatiale et étudie les effets de la météo spatiale sur les systèmes d¿alimentation électrique et les pipelines pour aider l¿industrie canadienne à comprendre et à atténuer les effets de la météo spatiale.