Use of image analysis in DC inclined plane tracking tests of nano and micro composites

Leakage current magnitude is used as one of the failure criteria in the tracking and erosion test IEC 60587. The 3 rd harmonic is also often used to identify periods of arcing activity. This technique is not available for the equivalent dc test. This paper presents the use of a machine vision camera...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2011-04, Vol.18 (2), p.365-374
Main Authors: Rowland, S M, Bruce, G P, Yuting Liu, Krivda, A, Schmidt, L E
Format: Article
Language:English
Subjects:
composites
Degradation
Direct current
Discharge
Discharges
electrical discharge
Electrodes
Epoxy resins
Erosion
Fillers
IEC 60587
image analysis
intermittency
Leakage current
Materials
nano
Nanocomposites
Nanomaterials
Nanostructure
Rubber
Studies
Surface discharges
Tracking
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Summary:Leakage current magnitude is used as one of the failure criteria in the tracking and erosion test IEC 60587. The 3 rd harmonic is also often used to identify periods of arcing activity. This technique is not available for the equivalent dc test. This paper presents the use of a machine vision camera alongside measurements of leakage current to identify discharge activity during dc testing and so enable determination of arc intermittency. This simple image processing technique is shown to add significant value to the existing leakage current analysis techniques and can provide an understanding of the process of degradation and its dependence on voltage polarity. Tests are reported on a commercial silicone rubber compound, a micro-filled epoxy resin, and the same epoxy resin system with nano particle fillers at 5% by weight. It is shown that the technique is applicable to this wide range of materials. It is also shown that changes to the performance of the epoxy compound by the addition of nano filler is due to more than just improving discharge resistance, reported elsewhere. The wettability of the samples is seen to be important, controlling moisture flow during a test. For this reason, in the case of the top electrode being positive, the nano filled material failed the test earlier than the standard material, with reduced erosion but increased leakage current.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2011.5739439