The proximity effect of earth conductivity change on geomagnetically induced current

Author

Liu, C. ; Lin, C. ; Dong, B. ; Zhang, P.

Author_Institution

North China Electr. Power Univ., Beijing, China

fYear

2015

fDate

11-15 May 2015

Firstpage

1

Lastpage

1

Abstract

During geomagnetic storms, the geoelectric field drives currents in transmission grids, railway system and pipelines. These geomagnetically induced currents (GIC) threaten the safe operation of equipment. The GIC recordings show that geological structure has significant implications for GIC in power gird (Liu Chunming et al. 2009). In the region with complex geological structure, the horizontal change of earth conductivity will change the distribution of geoelectric field (Albertson & Balelen 1970). In particular, the“proximity effect” will influence the electric field in the perpendicular direction of conductivity change. If the transmission line is parallel with the interface of conductivity change, the “proximity effect” has a significant impact on GIC of power grids. Therefore, the “proximity effect” is an important case of the earth conductivity in connection with studies of geomagnetically induced currents.

Keywords

Galerkin method; eddy currents; electrical conductivity; ionosphere; magnetic storms; magnetosphere; terrestrial electricity; GIC recordings; complex geological structure; earth conductivity change; geoelectric field distribution; geoelectric field drive currents; geological structure; geomagnetically induced currents; pipelines; power grids; proximity effect; railway system; transmission grids; transmission line; Conductivity; Earth; Electric fields; Finite element analysis; Power grids; Power transmission lines; Proximity effects;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetics Conference (INTERMAG), 2015 IEEE

Conference_Location

Beijing

Print_ISBN

978-1-4799-7321-7

Type

conf

DOI

10.1109/INTMAG.2015.7157204

Filename

7157204