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Información tecnológica

On-line version ISSN 0718-0764

Abstract

KANASHIRO, Arnaldo G; ZANOTTI JR, Milton; OBASE, Paulo F  and  BACEGA, Wilson R. Assessment Methodology of Silicon Carbide Surge Arresters. Inf. tecnol. [online]. 2010, vol.21, n.3, pp.115-124. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642010000300013.

This work presents results of a research project dveloped for determining the diagnostic of silicon carbide surge arresters. Tests were performed in these arresters in the laboratory, considering the power frequency spark-over voltage and lightning spark-over voltage tests. The results were compared with values of leakage current, radio-influence voltage test and thermovision, obtained in the same surge arresters. It was observed a reasonable correlation between high values of the leakage current, considering the amplitude and the third harmonic component, and the presence of degradation in the surge arresters. Therefore, it was concluded that leakage current measurements can provide important information about the stage of degradation of the surge arresters. Measurements in the substations during several years could provide the identification, in case of leakage current variations, of deteriorated silicon carbide surge arresters.

Keywords : silicon carbide; leakage current; surge arresters; substation.

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