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The multiconductor transmission line (MTL) method is commonly adopted when the transient characteristics of the transformer winding is studied. However, for the fast transient pulse (FTP) which is an important threat to power systems, its frequency spectrum can reach tens of megahertz and whether the MTL method is still applicable needs to be further studied. In this paper, a simplified winding model is established, and the MTL method and finite-element method are developed. The time-domain and frequency-domain characteristics of the winding under these two methods are simulated and compared. Simulation results show that the difference between the MTL method and finite-element method cannot be ignored when the frequency exceeds around 25 MHz for the model in this paper. Considering that the frequency spectrum of FTP can reach tens of megahertz, the MTL method may not be suitable for the calculation of the transformer winding under the FTP.

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Research on the Applicability of Multiconductor Transmission Line Method Under Fast Transient Pulse

  • 会议论文

  • 发表日期：

    2025年

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  • Ruihan Qi,
  • Yue Li,
  • Song Zhang,
  • Xiaobing Xiao,
  • Yongxiang Cai,
  • Lei Jia

摘要

The multiconductor transmission line (MTL) method is commonly adopted when the transient characteristics of the transformer winding is studied. However, for the fast transient pulse (FTP) which is an important threat to power systems, its frequency spectrum can reach tens of megahertz and whether the MTL method is still applicable needs to be further studied. In this paper, a simplified winding model is established, and the MTL method and finite-element method are developed. The time-domain and frequency-domain characteristics of the winding under these two methods are simulated and compared. Simulation results show that the difference between the MTL method and finite-element method cannot be ignored when the frequency exceeds around 25 MHz for the model in this paper. Considering that the frequency spectrum of FTP can reach tens of megahertz, the MTL method may not be suitable for the calculation of the transformer winding under the FTP.