On geomagnetically-induced currents in the Finnish 400 kV power system by an auroral electrojet current
The auroral electrojet current flowing in the ionosphere is modeled by a horizontal east-west line current of infinite length. The earth is described by a simple two-layer model. An expression for the earth-surface electric field, which is thus connected with a geomagnetic disturbance in and near the auroral zone, is given. This electric field is considered as external from the viewpoint of the Finnish 400 kV power system, and the resulting geomagnetically-induced currents (GICs) in the system are computed. In the north, i.e. near the electrojet, GICs may have values even in the order of hundreds of amperes. A comparison to GICs produced by an equivalent spatially-constant external electric field is demonstrated. Sometimes the location of the electrojet is further south. This possibility is studied by letting the line current have several different locations above the Finnish power grid.
- Research Organization:
- Finnish Meteorological Institute/Dept. of Geophysics, Helsinki (FI)
- OSTI ID:
- 6052327
- Journal Information:
- IEEE Trans. Power Del.; (United States), Vol. 4:2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Finnish geomagnetically induced currents project
Theory of auroral electrojets
Related Subjects
29 ENERGY PLANNING
POLICY AND ECONOMY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
IONOSPHERE
ELECTRIC FIELDS
POWER SYSTEMS
ENVIRONMENTAL EFFECTS
AURORAE
ELECTROMAGNETIC PULSES
MAGNETIC STORMS
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
ENERGY SYSTEMS
PLANETARY IONOSPHERES
PULSES
RADIATIONS
200302* - Power Transmission & Distribution- DC Systems- (1989-)
296002 - Energy Planning & Policy- Electric Power Transmission & Distribution- (-1989)
640201 - Atmospheric Physics- Auroral
Ionospheric
& Magetospheric Phenomena