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Research on circulating current between stator windings in hydrogenerator with field winding inter-turn short circuit

Author

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  • Xin, Peng
  • Shen, Hang

Abstract

To study the characteristics and influencing factors of harmonic circulating currents between the stator windings parallel branches when there is an inter-turn short circuit in the field winding of a large hydrogenerator, starting from the structural characteristics of hydrogenerator, the expression of induced electromotive force generated by each branch winding of stator was derived in detail after the fault. The harmonic characteristics of induced electromotive force difference and circulating current between stator winding branches after fault were obtained, and the influence of rotor pole pair number and the distance between stator winding branches on the harmonic circulating current characteristics between parallel branches of stator windings was revealed. Then, taking two large hydrogenerators as the research objects, and the field-circuit coupling simulation models were established. Simultaneously, relevant experiments were conducted, it was verified the correctness of the simulation models. Based on this, the simulation models were used to simulate the field windings short circuit. The simulation results of the harmonic circulating current between stator windings after the fault in both generators were consistent with the theoretical derivation results, which verified the correctness and universal applicability of the theoretical derivation.

Suggested Citation

  • Xin, Peng & Shen, Hang, 2025. "Research on circulating current between stator windings in hydrogenerator with field winding inter-turn short circuit," Energy, Elsevier, vol. 339(C).
    • Handle: RePEc:eee:energy:v:339:y:2025:i:c:s0360544225047577
    DOI: 10.1016/j.energy.2025.139115
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