Impulse-response analysis of toroidal core distribution transformers for dielectric design

Pablo Gómez, Francisco De León, Ivn A. Hernández

Research output: Contribution to journalArticlepeer-review


Toroidal transformers are currently used only in low-voltage applications. There is no published experience for toroidal transformer design at distribution-level voltages. This paper explores the lightning impulse response of toroidal distribution transformers in order to obtain a dielectric design able to withstand standardized impulse tests. Three-dimensional finite-element simulations are performed to determine the capacitance matrix on a turn-to-turn basis. Then, a lumped parameter RLC model is applied to predict the transient response of the winding as well as to obtain the potential distribution along the winding and corresponding dielectric stresses. The model computes the impulse potential distribution and the dynamic (interturn and interlayer) dielectric stresses. Different insulation design strategies are proposed by means of electrostatic shielding and variation of the interlayer insulation.

Original languageEnglish (US)
Article number5645726
Pages (from-to)1231-1238
Number of pages8
JournalIEEE Transactions on Power Delivery
Issue number2
StatePublished - Apr 2011


  • Distribution transformers
  • electrostatic analysis
  • finite-element method
  • impulse test
  • insulation design
  • toroidal transformers
  • transient analysis

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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