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Development and application of a methodology for the classification of the operating conditions of power transformers; Desarrollo y aplicacion de una metodologia para la clasificacion del estado operativo de transformadores de potencia

Abstract

This thesis work shows the development of a classification model that allows the user to assess the operative condition of power transformers. The proposed model includes the following steps: Relative weights assignation for each IEEE-62-1995 required test. Those relative weights are obtained from test results and standardized and experience based limits obtained by Comision Federal de Electricidad (CFE). Once the relative weights have been assigned, three states, green, yellow and red were defined. Each state was then ranked with a weight number (1, 2 or 3). Specific weights were assigned for each test included in the model. Test score assignation takes into account the product of the relative value and the specific weight of each test. Transformer risk assessment uses the total score obtained from the sum of the tests partial scores. Transformer risk assessment was then classified in three categories. Total score causes the system to issue maintenance or substitution recommendations. The described model will improve maintenance scheduling according the transformer risk assessment and it is fully applicable to the complete CFE power transformer population. Further, smart investment and substitution plans, can be easily obtained from the model, preventing catastrophic failures that may cause logistic and economical problems to  More>>
Publication Date:
May 15, 2004
Product Type:
Thesis/Dissertation
Resource Relation:
Other Information: TH: Thesis (M. Sc.)
Subject:
20 FOSSIL-FUELED POWER PLANTS; TRANSFORMERS; EVALUATION; MAINTENANCE; STANDARDS DOCUMENT; MEXICAN ORGANIZATIONS; HYDROELECTRIC POWER PLANTS; NUMERICAL DATA
OSTI ID:
21309941
Research Organizations:
Instituto de Investigaciones Electicas, Programa de Posgrado, Cuernavaca, Morelos (Mexico)
Country of Origin:
Mexico
Language:
Spanish
Other Identifying Numbers:
TRN: MX1000050
Availability:
Available from Gerencia de Informacion Tecnologica, Instituto de Investigaciones Electricas, Reforma 113, Col. Palmira, 62490 Cuernavaca, Morelos, Mexico.
Submitting Site:
MX
Size:
[135] pages
Announcement Date:
Jun 03, 2010

Citation Formats

Lara Covarrubias, Hector. Development and application of a methodology for the classification of the operating conditions of power transformers; Desarrollo y aplicacion de una metodologia para la clasificacion del estado operativo de transformadores de potencia. Mexico: N. p., 2004. Web.
Lara Covarrubias, Hector. Development and application of a methodology for the classification of the operating conditions of power transformers; Desarrollo y aplicacion de una metodologia para la clasificacion del estado operativo de transformadores de potencia. Mexico.
Lara Covarrubias, Hector. 2004. "Development and application of a methodology for the classification of the operating conditions of power transformers; Desarrollo y aplicacion de una metodologia para la clasificacion del estado operativo de transformadores de potencia." Mexico.
@misc{etde_21309941,
title = {Development and application of a methodology for the classification of the operating conditions of power transformers; Desarrollo y aplicacion de una metodologia para la clasificacion del estado operativo de transformadores de potencia}
author = {Lara Covarrubias, Hector}
abstractNote = {This thesis work shows the development of a classification model that allows the user to assess the operative condition of power transformers. The proposed model includes the following steps: Relative weights assignation for each IEEE-62-1995 required test. Those relative weights are obtained from test results and standardized and experience based limits obtained by Comision Federal de Electricidad (CFE). Once the relative weights have been assigned, three states, green, yellow and red were defined. Each state was then ranked with a weight number (1, 2 or 3). Specific weights were assigned for each test included in the model. Test score assignation takes into account the product of the relative value and the specific weight of each test. Transformer risk assessment uses the total score obtained from the sum of the tests partial scores. Transformer risk assessment was then classified in three categories. Total score causes the system to issue maintenance or substitution recommendations. The described model will improve maintenance scheduling according the transformer risk assessment and it is fully applicable to the complete CFE power transformer population. Further, smart investment and substitution plans, can be easily obtained from the model, preventing catastrophic failures that may cause logistic and economical problems to the Mexican Power System operation. As an example, the results obtained from the model application to two transformer banks installed in a CFE hydroelectric power plant were discussed and analyzed. [Spanish] El trabajo que se muestra en esta tesis, es el desarrollo de un modelo para la clasificacion del estado operativo de los transformadores de potencia. El modelo propuesto incluye los siguientes pasos: Asignacion de pesos relativos para cada una de las pruebas establecidas en la norma IEEE-62-1995 en funcion de sus resultados, limites establecidos en la normatividad y limites propuestos con base en la experiencia de la Comision Federal de Electricidad (CFE). Se asignan tres estados de semaforizacion (verde, amarillo y rojo) para cada paso relativo y de acuerdo a los resultados de prueba se le asignara un paso relativo (1, 2 o 3). Asignacion de pesos especificos a cada una de las pruebas consideradas en el modelo. Determinacion del producto del vapor relativo para su peso especifico para cada prueba, obteniendo un puntaje para cada una de las pruebas. Obtencion del grado de riesgo del transformador bajo evaluacion mediante un calculo de puntaje final, es decir, la sumatoria de los puntajes individuales de cada prueba. Definicion de tres categorias para la clarificacion del grado de riesgo de transformadores de acuerdo a sus puntajes finales. Clasificacion del estado operativo de los transformadores evaluados de acuerdo al puntaje obtenido, el cual se ubica en una de las tres categorias definidas. Con la semaforizacion se priorizan las recomendaciones pertinentes. Con la aplicacion del modelo para la clasificacion del estado operativo de los transformadores de potencia, se puede programar mantenimiento de acuerdo al grado de riesgo. El modelo desarrollado puede ser aplicado a todo el parque de transformacion de la CFE, permitiendo con esto programar la inversion para la situacion, previniendo fallas catastroficas que pueden ocasionar problemas de logistica y economicos a la operacion del sistema electrico nacional de potencia. Como ejemplo, se analizan los resultados de la aplicacion del modelo en 2 bancos de transformacion instalados en la Central Hidroelectrica Malpaso.}
place = {Mexico}
year = {2004}
month = {May}
}