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Effects of the Loading Level on the Harmonic Distortion Caused by GIC Flows Through 3φ Auto-Transformers
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DOI：10.1109/TIA.2025.3587183.png)
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Abstract
En 中文
Geomagnetically induced currents (GICs) are quasi-dc currents that are formed due to geo-magnetic disturbance events. Such quasi-dc currents flow from the ground to power systems, and complete their path through grounded equipment, including 3cp auto-transformers. The flow of a GIC through a 3cp auto-transformer can lead to a significant harmonic distortion, a large increase in reactive power demands, and/or a large increase copper losses. The severity of GIC flow impacts on a 3cp auto-transformer can be dependent on the core design, winding configuration, grounding circuit, and GIC current. This paper discusses possible contributions of loading levels to GIC impacts on a 3cp auto-transformer. These possible contributions are analyzed through experimental tests carried out using a laboratory 3cp, multi-core auto-transformer. Experimental tests are conducted for various GIC flows, where the loading level is varied. Test results conclude that the loading level of a 3cp auto-transformer has minor effects on the levels of harmonic distortion caused by the flow of a GIC.
Keywords:
Power transformers
Magnetic flux
Magnetic hysteresis
Saturation magnetization
Magnetic domains
Loading
Reactive power
Mathematical models
Harmonic distortion
Transformer cores
Geomagnetically induced currents (GICs)
half-cycle magnetic saturation
harmonic distortions
and auto-transformer loading
and auto-transformer loading
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4.5
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1.1W
Citations:
3.5W
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