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DC ramp rate effect on the breakdown response of SiO2-BOPP nanocomposites

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Original languageEnglish
Title of host publication2015 IEEE 11th International Conference on the Properties and Applications of Dielectric Materials (ICPADM)
PublisherInstitute of Electrical and Electronics Engineers IEEE
Number of pages4
ISBN (Print)978-1-4799-8903-4
Publication statusPublished - 2015
Publication typeA4 Article in a conference publication
EventInternational Conference Properties and Applications of Dielectric Materials - , Australia
Duration: 1 Jan 2015 → …


ConferenceInternational Conference Properties and Applications of Dielectric Materials
Period1/01/15 → …


The effect of voltage ramp rate on the short-term dielectric breakdown strength of polymer nanocomposites is not well-documented. In this paper, the effect of DC field ramp rate on the large-area breakdown performance of melt-extruded bi-axially oriented polypropylene (BOPP) films incorporating 4.5 wt-% of nano-silica is studied. By utilizing a self-healing multi-breakdown measurement method with a variable DC voltage ramp rate, a statistically large amount of breakdown data was obtained from a large total sample film area as a function of DC field ramp rate (0.1–50 Vs−1µm−1)). With a decreasing ramp rate, Weibull statistical analysis of the breakdown data suggests a systematically decreasing trend in the breakdown strength (Weibull α) and an increase in the Weibull shape parameter of time (>1) for the nanocomposite. The observed behavior is speculated to be attributable to highly altered internal charge dynamics of the silica-BOPP nanocomposite. The results exemplify the importance of careful breakdown strength assessment when dielectric films of more complex internal structure are studied.

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