Abstract
The influence of shield wires on Geomagnetically Induced Currents (GICs)
in power systems is considered. For the most simple power network, with
one single transmission line and one shield wire connecting two
substations, we derive the expressions for the voltage source and the
resistance of the Thévenin equivalent circuits that, in parallel with
the substations grounding resistances, produce the same effects on GICs
as the full circuit. Our model extends results from previous studies
that considered the effect of shield wires resistances by also including
the induced geoelectric field.