Failure analysis in silicon steel sheet in distribution transformers. Effect of the zone of precedence of the transformers
Published 2018-05-07
Keywords
- Failure analysis,
- silicon steel sheet,
- distribution transformers,
- XRD,
- SEM-E
How to Cite
Abstract
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)
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References
[2] Mago M. Análisis de Fallas en Transformadores de Distribución Utilizando Métodos No Convencionales. Universidad de Carabobo, Área de Estudios de Postgrado. País: Valencia, Venezuela, 2011.
[3] Mago M, Valles L, Olaya J. Evaluación Metalográfica de la Chapa de Acero al Silicio y de los Devanados del Núcleo del Transformador Monofásico Bajo Condición de Falla. Revista INGENIERIA UC. 2011;18(3):51-63.
[4] Mago M. Sistema Estocástico Unificado para la Predicción Confiable de Fallas por Condiciones Ambientales en Transformadores de Distribución. Universidad de Carabobo, Área de Estudios de Postgrado. País: Valencia, Venezuela, 2014.
[5] Norma RA7-60. Valores de Pérdidas Equipos Bajo Condición de Carga. http://www.epm.com.co/site/Portals/0/Users/001/01/1/RA7-060.pdf. Consultado: 20-06-12 hora: 10:30.
[6] Mago M, Valles L, Olaya J. Análisis de Fallas en Transformadores de Distribución Utilizando el Software Estadístico SPSS (Statistical Package for The Social Sciences). Revista Ingeniería e Investigación Universidad Nacional de Colombia. 2012;32(2):40-5.
[7] Fang F, Xu YB, Zhang YX, Misra RDK, Wang GD. Journal of Magnetism and Magnetic Materials. 2015;381:433-9.
[8] Wang Y, Xu YB, Zhang YX, Liu HT, Wang GD. Journal of Magnetism and Magnetic Materials.2014;379:161-6.
[9] ASTM D 3906-03. Standard Test Method Determination for Relative X-ray Diffraction Intensities of Faujasite-Type Zeolite Containing Materials.
[10] ASTM D 3942-03. Standard Test Method Determination of the Unit Cell Dimension of a Faujasite-Type Zeolite.
[11] ASTM E-45. Standard Test Methods for DeterminigThe Inclusion Content of Steel.
[12] ASTM E 112-96. Standard Test Methods for Determinig Average Grain Size.
[13] Forero A. Laboratorio de Metales. Universidad Nacional de Colombia. Facultad de Ingeniería. País: Bogotá, Colombia, 1999.
[14] Mathews J, Fink K. Métodos Numéricos con Matlab.3 ed. Madrid, España: Editorial Prentice Hall, 2015.
[15] Lajtin Y. Metalografía y Tratamiento Térmico de los Metales.3 ed. Moscú, URSS: Editorial MIR, 1983.
[16] Staff EE. Circuitos Magnéticos y Transformadores. Argentina: Editorial Reverté; 1981.
[17] Mago M, Vallés L, Olaya J, Zequera M, Vera J. Method for Determining Total Losses in Distribution Transformers from The Percentage of Carbon Silicon Steel Sheet, Medellín, Colombia. Revista DYNA. 2016;83(198):148-53.
[18] Sun Q, Zan D, Chen J, Pan H.Analysis of edge crack behavior of steel sheet in multi-pass cold rolling based on a shear modified GTN damage model. .Theoretical and applied fracture mechanics. 2015;80:259-66.
[19] Tebyani SF, Dehghani K. Effects of SiC nanopowders on the mechanical properties and microstructure of interstitial free steeljoined via friction stir spot welding. Department of Mining and Metallurgical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran. Materials and Desing. 2016;90:660-8.