DINIZ, L.; http://lattes.cnpq.br/0970506061860633; DINIZ, Larissa.
Résumé:
This work presents an evaluation of the correlation between temperature and
electric field to the improvement of polymeric insulators inspection. Samples of
138 kV polymeric insulators, intact and defectives, were submitted to electrical
tests and thermographic measurements. Thus, the insulators removed from
transmission lines were submitted to seven level of applied voltage and the
thermographic measurements were realized once thermal equilibrium was
established. The polymeric insulators were modeled and computational
simulations of electric field were performed in the regions of interest. The results
of the thermographic measurements, performed during the tests, showed higher
temperature increases near the phase, when the defects are present. The results
of the computational simulations of the insulators without external defects
showed no electric field distortions. The analysis of defective insulators revealed
that the electric field is distorted and its intensity depends on the defects’
configuration and position, corroborating with the temperature measurements.
The results indicate the existence of a growth trend of the temperature at the
points where the electrical field is more intense (superficial holes).
