MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
In-Service Aged Composite Insulators at Transmission Line Investigated by the Micro-Computerized Tomography
Pietro P. J. C. SilvaArmando H. ShinoharaAdmilson P. PachecoZurdival P. Castro FilhoSergio L. P. Monteiro
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2012 Volume 53 Issue 4 Pages 617-620

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Abstract

Composite insulators aged in-service for almost 10 years at the transmission line of 230 kV, in an area where brittle fracture of a composite insulator occurred, were inspected by the micro-computed tomography, µ-CT, and by the scanning electron microscope, SEM. As a result, several cracks with different depths under pollutant scale and confined in silicone housing were detected by the µ-CT. Surface of silicone housing was observed by the SEM. Many randomly oriented cracks from micrometers size were observed. However, larger cracks detected and evaluated by the µ-CT appear essentially perpendicular to the composite rod axis. In order to explain the evolution of those large cracks in composite insulators, a model based on µ-CT and SEM data was proposed.

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© 2012 The Japanese Society for Non-Destructive Inspection
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