SILVA, M. A. B.; http://lattes.cnpq.br/8988044417728831; SILVA, Marcelo Augusto Bastos da.
Resumo:
Surge arresters are used to protect electrical systems against switchgear
and atmospheric surges. A defective or bad-dimensioned arrester may cause failures or
damage to substation apparatus. Routine and type tests are used to evaluate the surge
arresters operating capacity. Moreover, one of the techniques used in monitoring and
diagnosis of arrester is the thermal imaging. For the correct use of thermal imaging, it
becomes necessary to know the acceptable temperatures level of the materials that
compose the arrester. Computational simulations have been used to analyze electrothermal
model. This technique present several advantages, i.e. possibility of previous
analyses before the manufacturing and presents lower cost when compared with the
tests in laboratory. In this work, the surge arrester thermal behavior will be analyzed.
The surge arrester that was analyzed has a polymeric housing and 120 kV nominal
voltage. Tests based on IEC and ANSI standards were computationally simulated using
a comercial software based on Finite Elements Method. The temperature behavior of the
varistor blocks and housing was determined and analyzed.