Large-area dielectric breakdown performance of polymer films: Part I: Measurement method evaluation and statistical considerations on area-dependence

I. Rytöluoto, K. Lahti, M. Karttunen, M. Koponen

Research output: Contribution to journalArticle

19 Citations (Scopus)


A multi-breakdown measurement method for large-area dielectric breakdown characterization of polymer films is presented and evaluated. Based on the self-healing breakdown capability of metalized film, large amount of breakdown data can be obtained from a relatively large total film area, thus enabling the execution of detailed breakdown performance analysis. The studied films include non-metalized laboratoryscale, pilot-scale and commercial capacitor-grade bi-axially oriented polypropylene films in the thickness range of 14-25 ?m. With the active measurement area of 81 cm2 per sample, breakdown distributions covering total film areas of 486-972 cm2 are presented. Various aspects encompassing the sample film preparation, measurement procedure, breakdown progression, discharge event characterization, breakdown field determination, data validation and statistical analysis are discussed. Comparative small-area breakdown measurements were performed in order to study the relationship between the large-area multi-breakdown measurement method and a conventional small-area (1 cm2) manual breakdown measurement method. Implications of the areadependence and the applicability of the Weibull area-scaling are also discussed.
Original languageEnglish
Pages (from-to)689-700
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Issue number2
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed



  • Dielectric breakdown
  • Weibull distribution
  • area-dependence
  • large-area breakdown performance
  • self-healing
  • statistical analysis

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