Suppression of Incoming High-Frequency Overvoltage in Transformer Coils

High-frequency overvoltages are most dangerous for the insulation of transformer coils. It is because high-frequency pulse voltage creates an uneven distribution of voltage across the windings. The coil's first turns receive a disproportionately high voltage drop, leading to the inter-turn circ...

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Veröffentlicht in:IEEE transactions on power delivery 2021-10, Vol.36 (5), p.2988-2994
Hauptverfasser: Korobeynikov, Sergey M., Krivosheev, Sergey I., Magazinov, Sergey G., Loman, Valentin A., Ya, Nikolay
Format: Artikel
Sprache:eng
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Zusammenfassung:High-frequency overvoltages are most dangerous for the insulation of transformer coils. It is because high-frequency pulse voltage creates an uneven distribution of voltage across the windings. The coil's first turns receive a disproportionately high voltage drop, leading to the inter-turn circuit. The paper analyzes the types of lightning pulses and proposes a new suppression method based on the anomalous skin effect in a multilayer material and the design in the form of a coil. The developed device is simulated, and the results of overvoltage monitoring at the substation with the installed high-frequency overvoltage suppression device are analyzed.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2020.3031592