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Integral Approach-Based Sensitive Protection of Autotransformers for Turn-to-Turn Faults

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  • Krzysztof Solak

    (Faculty of Electrical Engineering, Wroclaw University of Science and Technology, 50-370 Wrocław, Poland)

  • Waldemar Rebizant

    (Faculty of Electrical Engineering, Wroclaw University of Science and Technology, 50-370 Wrocław, Poland)

  • Frank Mieske

    (Siemens AG, 13629 Berlin, Germany)

Abstract

Current differential protection, using either phase currents or negative-sequence components, is commonly applied for the sensitive protection of power transformers. However, this method proves insufficient for autotransformers, particularly when their tertiary winding is fully loaded, as demonstrated in this paper. To address this limitation, the authors’ previously proposed negative-sequence integral approach for power transformers has been adapted and evaluated for three-winding autotransformers. The results show that this integral protection offers significantly higher sensitivity than current differential schemes while maintaining security during external faults with current transformer saturation.

Suggested Citation

  • Krzysztof Solak & Waldemar Rebizant & Frank Mieske, 2025. "Integral Approach-Based Sensitive Protection of Autotransformers for Turn-to-Turn Faults," Energies, MDPI, vol. 18(13), pages 1-17, June.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:13:p:3273-:d:1685393
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