Portal de Periódicos da CAPES

Artigo Acesso aberto Produção Nacional Revisado por pares

BIBTEX RIS

In-Service Aged Composite Insulators at Transmission Line Investigated by the Micro-Computerized Tomography

2012; Volume: 53; Issue: 4 Linguagem: Inglês

10.2320/matertrans.i-m2012802

1347-5320

Pietro Paolo de Oliveira Silva, Armando Hideki Shinohara, Admilson da Penha Pachêco, Zurdival P. Castro Filho, Sergio L. P. Monteiro,

Non-Destructive Testing Techniques

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.