Weibull statistical analysis of impulse driven surface breakdown data

Mark Wilson, M Given, Igor Timoshkin, Scott Macgregor, Tao Wang, M.A. Sinclair, K.J. Thomas, J.M. Lehr

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

1 Citation (Scopus)

Abstract

Surface breakdown of oil-immersed solids chosen to insulate high-voltage, pulsed-power systems is a problem that can lead to catastrophic failure. Statistical analysis of the breakdown voltages associated with such liquid-solid interfaces can reveal useful information to aid system designers in the selection of solid materials. Described in this paper are the results of a Weibull statistical analysis, applied to breakdown voltage data generated in gaps consisting of five different solid polymers immersed in mineral oil. Values of the location parameter γ provide an estimate of the applied voltage below which breakdown will not occur, and under uniform-field conditions, γ varied from 192 kV (480 kV/cm) for polypropylene to zero for ultra-high molecular weight polyethylene (i.e. the data for UHMWPE were better described by a two-parameter distribution). Longer times to breakdown were measured for UHMWPE when compared with the other materials. However, high values of the shape parameter β reported in the present paper suggest greater sensitivity to an increase in applied voltage – that is, the probability of breakdown increases more sharply with increasing applied voltage for UHMWPE compared to the other materials. Only PP consistently reflected a low value of β across the different sets of test conditions.
Original languageEnglish
Title of host publicationIEEE conference record PPC2011
Subtitle of host publicationPulsed power conference 2011
Place of PublicationNew York
PublisherIEEE
Pages218-222
Number of pages5
ISBN (Print)9781457706295
DOIs
Publication statusPublished - Jun 2011
Event18th IEEE International Pulsed Power Conference - Chicago, United States
Duration: 19 Jun 201123 Jun 2011

Conference

Conference18th IEEE International Pulsed Power Conference
CountryUnited States
CityChicago
Period19/06/1123/06/11

Keywords

  • impulse driven
  • surface breakdown data
  • pulsed-power systems
  • breakdown voltages
  • Weibull statistical analysis
  • solid polymers
  • mineral oil
  • applied voltage

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