Resumo

MAGO, María Gabriela et al. Failure analysis in silicon steel sheet in distribution transformers. Effect of the zone of precedence of the transformers. Rev. ion [online]. 2017, vol.30, n.2, pp.87-98. ISSN 0120-100X.  https://doi.org/10.18273/revion.v30n2-2017008.

Failure analysis in the silicon steel sheet in distribution transformers presents a model based on the microstructure and magnetic properties of this material diagnosis, with which the core of the single-phase distribution transformers pole is manufactured. Such diagnoses, complementary studies to evaluate the life of these teams, comparing the quality of the materials that are manufactured using “unconventional methods” when present fault conditions, increasing expertise in distribution systems of electric power. The work was performed using techniques of characterization to the steel sheet using (X-ray diffraction) or XRD and SEM in environment (scanning electron microscopy) or E-SEM allowing a clearer view of the phenomena involved the behavior of the silicon steel sheet. Although previously performed metallographic samples of failed to check the size of grain impurities or inclusions that might have affected the quality of the material during operation equipment analysis, XRD is applied and the Scherrer equation is used by checking the size of the crystals (grains) in the nanoscale, and then with the formula Steinmetz losses are evaluated due to magnetic hysteresis also affects significantly the operation. Total Core Losses are due to the presence of Type D oxides and changes in crystal size (grain)

Palavras-chave : Failure analysis; silicon steel sheet; distribution transformers; XRD and SEM-E.

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