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Showing 1 to 5 of 5 for “"Geomagnetic disturbance (GMD)"”.
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Geomagnetically induced currents and their effect on power systems
… induce a change in the Earth’s magnetic field. Geomagnetically induced current (GIC) then enters the power grid and causes unusual real and reactive power flows, voltage fluctuations, frequency shifts, undesired relay operations, high third-harmonic currents and telemetry and supervisory alarm …
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Geomagnetically induced current sensitivity to assumed substation grounding resistances in the power system
A geomagnetic disturbance (GMD) can result in severe damage to the power grid by inducing quasi-dc currents called geomagnetically induced current (GIC). Protection against GMD therefore necessitates the accurate estimation of GICs. GICs estimation is challenging because it depends on substation …
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Optimal Mitigation of Geomagnetically Induced Current Effects in Power Systems Considering Transformer Thermal Limits
… the earth’s space environment causes temporary disturbance to the earth’s magnetosphere. Solar flares and coronal mass ejections (CME) of charged and magnetized particles can disturb the earth’s magnetic field and cause geomagnetic disturbance (GMD). GMDs are of particular concern as they give …
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Geomagnetically induced currents (GIC) in large power systems including transformer time response
Geomagnetically induced currents (GIC) are the result of changing geomagnetic fields which are a consequence of a geomagnetic disturbance (GMD). The flow of GIC through transmission lines and transformers across the power network could have severe consequences, if the magnitudes of the GIC are high …
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Power distribution feeder response to the asymmetric saturation of substation transformers caused by significant high-side DC currents.
High-altitude electromagnetic-pulse and geomagnetic disturbances can lead to asymmetric saturation of utility transformer cores by causing significant DC current to flow through the transformer windings. Transformer secondary voltage and current waveforms are distorted by core saturation and this …