IEEE transactions on dielectrics and electrical insulation
Volume number
11
Issue number
6
Start page
1057
End page
1064
Publisher
Institute of Electrical Electonics Engineers
Place of publication
Piscataway, N. J.
Publication date
2004-12
ISSN
1070-9878 1558-4135
Summary
A VHF method (30-300 MHz) is applied to identify faults and defects in ceramic insulators. Insulators which exhibit internal cracks and fractures are used as test samples. Different artificial conditions are introduced to the test samples according to the IEC 507 standard under wet and dry conditions. Using a cascading signal processing technique and analysis methods such as FFT and fractal analysis, VHF signals acquired by digital scope are processed and analyzed. This study indicates that the fractal dimension can be used as an effective tool to isolate the common faulty conditions found on the ceramic insulators. The results from this study strongly support the prospect of using a VHF method to monitor the physical condition of ceramic insulators.
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