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

Krzysztof Solak, Waldemar Rebizant () and Frank Mieske
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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

Energies, 2025, vol. 18, issue 13, 1-17

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.

Keywords: autotransformers; turn-to-turn faults; protection algorithms; integral approach; negative-sequence components; sensitivity; security (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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