Principal component and hierarchical cluster analyses as applied to transformer partial discharge data with particular reference to transformer condition monitoring

T. Babnik, R.K. Aggarwal, P.J. Moore

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34 Citations (Scopus)


This paper analyses partial discharges obtained by remote radiometric measurements from a power transformer with a known internal defect. Since fingerprints of remote radiometric measurements are not available, the formation of clusters with similar features obtained from captured partial discharge data is crucial. Hierarchical cluster analysis technique is used as a method for grouping different signals. Investigation based on Euclidian and Mahalanobis distance measures and Ward and Average linkage algorithms were performed on partial discharge data pre-processed by principal component analysis. As a result of the analysis, a clear separation of partial discharges emanating from the transformer and discharges emanating from its surrounding is achieved; this in turn should enhance the methodologies for condition monitoring of power transformers.
Original languageEnglish
Pages (from-to)2008-2016
Number of pages8
JournalIEEE Transactions on Power Delivery
Issue number4
Publication statusPublished - Oct 2008



  • cluster analysis
  • condition monitoring
  • partial discharges
  • principal component analysis
  • transformers

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