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The role of interfaces in the dielectric strength of polymeric films under high intensity fields
Published online by Cambridge University Press: 26 October 2005
Abstract
This paper examines the role of interfaces in the polymeric
insulating films under the scope of their dielectric strength. PET
(Polyethylene terephthalate) films of different thickness are put
together forming a planar sample of a typical thickness of $200~\mu$m
and subjected to AC ramp voltage, until the dielectric
breakdown. The role of interface as a potential barrier for
electrons was examined as well as the influence of interface
number for a standard thickness. Experiments were also executed
for investigating the role of the position of the first, the
second and the last interface in the sample. All the experiments
were executed with the same voltage rising rate, the breakdown AC
voltage Vb was measured and the dielectric strength Fb
was calculated. It was shown that interfaces act as deep trapping
centers for electrons giving rise to the sample dielectric
strength for sort time experiments. Moreover the thinner the first
film, the higher the dielectric strength for the sample. It was
also found that the position of the second interface does not play
an important role in the process.
- Type
- Research Article
- Information
- The European Physical Journal - Applied Physics , Volume 32 , Issue 2 , November 2005 , pp. 109 - 114
- Copyright
- © EDP Sciences, 2005
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