<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0379-3982</journal-id>
<journal-title><![CDATA[Revista Tecnología en Marcha]]></journal-title>
<abbrev-journal-title><![CDATA[Tecnología en Marcha]]></abbrev-journal-title>
<issn>0379-3982</issn>
<publisher>
<publisher-name><![CDATA[Instituto Tecnológico de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0379-39822020000300045</article-id>
<article-id pub-id-type="doi">10.18845/tm.v33i3.4485</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Metodología indirecta para la estimación de vida útil residual de transformadores de potencia a partir de la evaluación de los materiales dieléctricos]]></article-title>
<article-title xml:lang="en"><![CDATA[Indirect methodology for life-span estimation of power transformers from the evaluation of its dielectric materials]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Acuña-Barrantes]]></surname>
<given-names><![CDATA[Luis Diego]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-Ramírez]]></surname>
<given-names><![CDATA[Gustavo Adolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<volume>33</volume>
<numero>3</numero>
<fpage>45</fpage>
<lpage>56</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0379-39822020000300045&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0379-39822020000300045&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0379-39822020000300045&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Una adecuada y confiable operación de los transformadores de potencia en las redes eléctricas constituye un factor determinante en la continuidad de servicio, lo cual justifica su atención en la evolución de su integridad, definida sobre todo por su sistema dieléctrico compuesto principalmente por papel - aceite. La investigación se centró en el análisis de pruebas químicas aplicadas a un grupo de transformadores de potencia de 10 MVA con distintos periodos de operación y su correlación con el envejecimiento real estimado por el Grado de Polimerización (GP) y el 2-furaldehído (2-FAL), además de pruebas de esfuerzo mecánico al papel dieléctrico. Los esfuerzos medidos en el papel dieléctrico presentaron una reducción de 74.49 % respecto al valor mínimo establecido por la IEC (80 MPa) y un GP aproximado de 88.4. Las condiciones operativas de cada transformador junto con el porcentaje de humedad del papel dieléctrico, los gases totales y de Oxígeno medidos en ppm, permitieron estimar el 2-FAL de forma indirecta. Los resultados aproximados del Grado de Polimerización fueron suficientes para su evaluación como condición &#8220;levemente envejecida&#8221;. De modo que, la aproximación de la vida útil residual máxima resultó ser de 27 años. Dicha estimación es congruente con los bajos niveles de gases combustibles medidos (menores a 700 ppm) y de Oxígeno.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract An adequate and reliable operation of the power transformers in the electrical networks constitutes a determining factor in the continuity of service, which justifies its attention in the evolution of its integrity, defined by its dielectric system mainly conform by oil and paper. The research focused on the analysis of chemical tests applied to a group of 10 MVA power transformers with different periods of operation and their correlation with the actual aging estimated by the Degree of Polymerization (DP) and 2-furaldehyde (2-FAL), in addition to mechanical stress tests applied to the dielectric paper. This stress, measured in the dielectric paper, presented a reduction of 74.49% with respect to the minimum value established by the IEC (80 MPa) and a DP of 88.4. The operating conditions of each transformer along with the percentage of humidity of the dielectric paper, the total and Oxygen gases measured in ppm, allowed the estimation of 2-FAL indirectly. The approximate results of the Degree of Polymerization were enough for its evaluation as a &#8220;slightly aged&#8221; condition. So, the approximation of the maximum life-span was 27 years. This estimate is consistent with the low levels of measured combustible gases (less than 700 ppm) and Oxygen.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Aceite dieléctrico]]></kwd>
<kwd lng="es"><![CDATA[papel dieléctrico]]></kwd>
<kwd lng="es"><![CDATA[degradación]]></kwd>
<kwd lng="es"><![CDATA[Furaldehídos]]></kwd>
<kwd lng="es"><![CDATA[grado de polimerización]]></kwd>
<kwd lng="en"><![CDATA[Dielectric oil]]></kwd>
<kwd lng="en"><![CDATA[dielectric paper]]></kwd>
<kwd lng="en"><![CDATA[degradation]]></kwd>
<kwd lng="en"><![CDATA[Furaldehyde]]></kwd>
<kwd lng="en"><![CDATA[degree of polymerization.]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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