Magnetic core effects on the high-frequency behavior of transformers

Farzad Nasirpour*, Mohamad Ghaffarian Niasar, Marjan Popov

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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This paper investigates the high-frequency transformer losses attributed to eddy currents in both conductors and the core. A comprehensive model of a transformer winding is presented, meticulously incorporating skin and proximity effects. The winding resistance increase due to these effects is determined by applying analytical and finite element methods. The investigation highlights that eddy current losses in the magnetic core notably increase the resistance of each winding section in low frequencies. However, the impact of these losses diminishes as the winding length approaches the voltage wavelength at high frequencies. Consequently, the net magnetomotive force and flux in the core become negligible. As a result, the high-frequency impedance characteristics are remarkably similar for windings with and without a magnetic core. These findings are substantiated through rigorous simulations and empirical measurements.
Original languageEnglish
Article number110035
Number of pages8
JournalInternational Journal of Electrical Power & Energy Systems
Publication statusPublished - 2024


  • Overvoltages
  • Power system transients
  • Power transformers
  • Resonances


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