SWP Power Grid & Ground-Based Infrastructure Impacts

Question 1

Geomagnetically induced currents (GICs) in power grids are caused by:

Accepted Answer

Rapid changes in Earth's magnetic field inducing electric fields that drive currents in long conductors

Answer

Lightning discharges from auroral precipitation

Answer

Solar radio burst interference in grid monitoring electronics

Answer

Direct solar wind particle impacts on transmission lines

Question 2

The March 1989 geomagnetic storm famously caused:

Accepted Answer

Collapse of the Hydro-Québec power grid in approximately 92 seconds

Answer

Destruction of GOES-7 satellite

Answer

Failure of all North American HF radio for 12 hours

Answer

Disruption of the Apollo program lunar communications

Question 3

High-voltage power transformers are particularly vulnerable to GICs because:

Accepted Answer

Even small quasi-DC GICs can half-cycle saturate transformer cores, causing overheating and reactive power loss

Answer

Their insulation is weakened by magnetic fields

Answer

GICs reverse the transformer winding polarity

Answer

GICs increase AC resistance, tripping current overload protections

Question 4

Which geographic characteristic makes a region's power grid most susceptible to GIC damage?

Accepted Answer

High latitude with resistive igneous bedrock and long transmission lines

Answer

Tropical location with high humidity

Answer

Proximity to ocean coastlines

Answer

Dense urban load concentration

Question 5

The geoelectric field magnitude that drives GICs in surface conductors is most directly controlled by:

Accepted Answer

The rate of change of the horizontal geomagnetic field (dB/dt) and ground conductivity structure

Answer

Solar wind proton density

Answer

Dst index minimum value

Answer

10.7-cm solar flux

Question 6

Pipeline operators monitor for GICs primarily because induced currents can:

Accepted Answer

Accelerate electrochemical corrosion of metal pipelines by disrupting cathodic protection systems

Answer

Reverse pipeline flow direction

Answer

Cause pipeline pressure increases

Answer

Trigger gas ignition from static discharge