Air Core Transformer Winding Disk Deformation: A Precise Study on Mutual Inductance Variation and its Influence on Frequency Response Spectrum

Mehdi Bagheri, Svyatoslav Nezhivenko, Toan Phung, Trevor Blackburn

Research output: Contribution to journalArticle

Abstract

It is well-known that deformation of transformer winding can produce detectable changes to
the frequency response spectrum as compared to a referenced past measurement. To interpret such changes
for diagnostic purposes, main causes of the trace deviation need to be recognized precisely. In addition, it is
useful that interpretation of transformer frequency response is classified in a way that IoT-based techniques
can be developed in the near future to analyze transformer mechanical integrity. This study has specifically
concentrated on the inductance and capacitance variation due to the axial and radial disk deformation of
transformer winding. Analytical analyses on self- and mutual-inductance variations are discussed and
capacitance variation is studied in detail for symmetrical and asymmetrical transformer disk deformations.
A numerical example is provided to establish the analytical approach and compare inductance and
capacitance variation. The analytical approach is finally examined through experimental study of disk
deformation in a 66 kV transformer winding.
Original languageEnglish
Pages (from-to)1
Number of pages13
JournalIEEE Access
Publication statusPublished - Dec 1 2017

Keywords

  • Axial deformation
  • Frequency response analysis
  • Radial deformation
  • Transformer winding deformation.

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