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Detecting defects in outdoor non-ceramic insulators using near-field microwave non-destructive testing

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5 Author(s)
Qaddoumi, N. ; Dept. of Electr. Eng., American Univ. of Sharjah, Sharjah, United Arab Emirates ; El-Hag, A.H. ; Hosani, M. ; Mansouri, I.
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This paper presents a novel near-field microwave nondestructive testing technique for defect detection in non-ceramic insulators (NCI). In this work, distribution class 33 kV NCI samples with no defects, air voids in silicone rubber, cracks in the fiberglass core and small metallic inclusion between the fiber core and shank were inspected. The microwave inspection system utilizes an open-ended rectangular waveguide sensor operating in the near-field at a frequency of 24 GHz. The used inspection system is simple, safe and relatively inexpensive. A data acquisition system was used to record the measured data. The results showed that all defects were repeatedly detected with high sensitivity. Line scans of the samples were obtained revealing the presence of different defects and their location. The technique also demonstrated ability to detect thickness variations in the silicon rubber shank.

Published in:

Dielectrics and Electrical Insulation, IEEE Transactions on  (Volume:17 ,  Issue: 2 )

Date of Publication:

April 2010

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