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It is a common problem that transformers have different degrees of turn to turn short-circuit (TTS). The fault severity depends on the location and size of the short-circuit. In this paper, the position of the short circuit is controlled in the middle of the coil. On this basis, the transformer with 5%, 10% and 20% TTS on the high voltage side of phase B is studied. Therefore, TTS faults from slight to deep are simulated, and the effect of different degrees of TTS on transformer equipment is analyzed. Firstly, a three-phase transformer is modeled by the numerical computation method and simulated by “field-circuit” coupling. The distribution of parameters such as short-circuit current, spatial magnetic leakage and radial electric force of different degrees of TTS are studied. Secondly, combined with the winding losses, the “electric-magnetic-thermal-structural” multi-physical field coupling simulation is established. Based on this, the transient analysis of winding temperature rise. Then the TTS capacity of the transformer is estimated according to the transformer structure and material tolerance value. Finally, by designing the winding temperature rise test, the paper compares the winding temperature distribution changes between simulation and test. Furthermore, the reliability of the model established in this paper and the accuracy of simulating the transformer TTS bearing capacity by test are verified. These provide engineering reference significance for subsequent transformer fault maintenance.

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Simulation Analysis and Scaling Test of Transformer Turn to Turn Short-Circuit Transient Characteristics Based on Field-Circuit Cooperation

  • 会议论文

  • 发表日期：

    2025年

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  • Junxian Wang,
  • Zheming Zhang,
  • Zhoulong Wang,
  • Zhiwei Chen

摘要

It is a common problem that transformers have different degrees of turn to turn short-circuit (TTS). The fault severity depends on the location and size of the short-circuit. In this paper, the position of the short circuit is controlled in the middle of the coil. On this basis, the transformer with 5%, 10% and 20% TTS on the high voltage side of phase B is studied. Therefore, TTS faults from slight to deep are simulated, and the effect of different degrees of TTS on transformer equipment is analyzed. Firstly, a three-phase transformer is modeled by the numerical computation method and simulated by “field-circuit” coupling. The distribution of parameters such as short-circuit current, spatial magnetic leakage and radial electric force of different degrees of TTS are studied. Secondly, combined with the winding losses, the “electric-magnetic-thermal-structural” multi-physical field coupling simulation is established. Based on this, the transient analysis of winding temperature rise. Then the TTS capacity of the transformer is estimated according to the transformer structure and material tolerance value. Finally, by designing the winding temperature rise test, the paper compares the winding temperature distribution changes between simulation and test. Furthermore, the reliability of the model established in this paper and the accuracy of simulating the transformer TTS bearing capacity by test are verified. These provide engineering reference significance for subsequent transformer fault maintenance.