<?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>2224-6185</journal-id>
<journal-title><![CDATA[Tecnología Química]]></journal-title>
<abbrev-journal-title><![CDATA[RTQ]]></abbrev-journal-title>
<issn>2224-6185</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Oriente]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2224-61852020000100118</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estimación del tiempo de vida útil restante en transformadores de fuerza a partir de la despolimerización de la celulosa del aislamiento]]></article-title>
<article-title xml:lang="en"><![CDATA[Estimation of the remaining life time in power transformers from the depolymerization of insulation cellulose]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Crespo-Sánchez]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabrera-Sánchez]]></surname>
<given-names><![CDATA[J.L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Padrón-Padrón]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Sánchez]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Cienfuegos Centro de Estudios de Energía y Medio Ambiente ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Cienfuegos Departamentode Ingeniería Mecánica. ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Cienfuegos Departamento de Ingeniería Mecánica ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Cienfuegos Centro de Estudios de Energía y Medio Ambiente ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2020</year>
</pub-date>
<volume>40</volume>
<numero>1</numero>
<fpage>118</fpage>
<lpage>133</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2224-61852020000100118&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2224-61852020000100118&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2224-61852020000100118&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El tiempo de vida útil restante en transformadores depende del envejecimiento del aislamiento debido a la degradación térmica del papel, que supone la ruptura de las cadenas moleculares de la celulosa y puede cuantificarse a partir del grado de polimerización. Este tiempo es de gran interés para fabricantes, empresas eléctricas y centros de investigación pues constituye un factor decisivo para gestionar el riesgo asociado a la confiabilidad y calidad del servicio de las redes de distribución eléctricas. El objetivo de la investigación es predecir el tiempo de vida útil restante de los transformadores a partir del grado de polimerización. Se emplearon los métodos histórico lógico; inducción-deducción y generalización y matemáticos. Como principales resultados se estableció la ecuación más consistente para calcular el tiempo de vida remanente en los transformadores de fuerza a partir del grado de polimerización, del envejecimiento promedio y de los años de funcionamiento.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ ABSTRACT The useful life time residual in transformers depends on the aging of the insulation due to the thermal degradation of the paper, which supposes the rupture of the molecular chains of the cellulose and can be quantified from the degree of polymerization. This time is of great interest to manufacturers, electrical companies and research centers because it is a decisive factor to manage the risk associated with the reliability and quality of the service of the electrical distribution networks. The objective of the research is to predict the useful life time residual of the transformers from the degree of polymerization. The logical-historical; induction-deduction and generalization and mathematics methods were used. As the main results, the most consistent equation was established to calculate the remaining life time in the power transformers from the degree of polymerization, the average aging and the years of operation.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Celulosa]]></kwd>
<kwd lng="es"><![CDATA[degradación térmica]]></kwd>
<kwd lng="es"><![CDATA[envejecimiento]]></kwd>
<kwd lng="es"><![CDATA[grado de polimerización]]></kwd>
<kwd lng="es"><![CDATA[tiempo de vida útil restante]]></kwd>
<kwd lng="en"><![CDATA[Aging]]></kwd>
<kwd lng="en"><![CDATA[cellulose]]></kwd>
<kwd lng="en"><![CDATA[degree of polymerization]]></kwd>
<kwd lng="en"><![CDATA[remaining life time: thermal degradation of insulating paper]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="book">
<source><![CDATA[&#8220;IEEE Guide for loading mineral oil-immersed transformers]]></source>
<year>1996</year>
<publisher-loc><![CDATA[IEEE, USA ]]></publisher-loc>
<publisher-name><![CDATA[NORMA IEEE C57.91-1995]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<label>2</label><nlm-citation citation-type="book">
<source><![CDATA[&#8220;IEC Loading guide for oil-immersed power transformers,&#8221;]]></source>
<year>1991</year>
<edition>1991-09</edition>
<page-range>1-11</page-range><publisher-loc><![CDATA[Geneva, Switzerland ]]></publisher-loc>
<publisher-name><![CDATA[NORMA INTERNATIONAL IEC 60354]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B3">
<label>3</label><nlm-citation citation-type="book">
<source><![CDATA[&#8220;Measurement of the Average Viscometric Degree of Polymerization of New and Aged Cellulosic Electrically Insulating Materials]]></source>
<year>2007</year>
<edition>2.1 2007-7. 60450</edition>
<publisher-loc><![CDATA[Geneva, Switzerland ]]></publisher-loc>
<publisher-name><![CDATA[NORMA IEC 60450]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B4">
<label>4</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[SOARES]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[RICARDO]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[HEATLY]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[RODRIGES]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Low temperature thermal degradation of cellulosic insulating paper in air and transformer oil]]></article-title>
<source><![CDATA[Polymer International]]></source>
<year>2001</year>
<volume>50</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>303-8</page-range></nlm-citation>
</ref>
<ref id="B5">
<label>5</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[MCNUTT]]></surname>
<given-names><![CDATA[W]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Insulation Thermal Life Considerations for Transformer Loading Guides]]></article-title>
<source><![CDATA[IEEE Transactions on Power Delivery]]></source>
<year>1992</year>
<volume>7</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>392-401</page-range></nlm-citation>
</ref>
<ref id="B6">
<label>6</label><nlm-citation citation-type="book">
<source><![CDATA[Ageing of cellulose in mineral-oil insulated transformers]]></source>
<year>2007</year>
<publisher-loc><![CDATA[Romania ]]></publisher-loc>
<publisher-name><![CDATA[FOLLETO TÉCNICO CIGRÉ BROCHURE 323]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B7">
<label>7</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[DE PABLO]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Furfural and ageing: How are they related]]></source>
<year>1999</year>
<page-range>5/1-4</page-range><publisher-loc><![CDATA[Leatherhead ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B8">
<label>8</label><nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[J.M.]]></surname>
<given-names><![CDATA[Wetzer]]></given-names>
</name>
<name>
<surname><![CDATA[G.J.]]></surname>
<given-names><![CDATA[Cliteur]]></given-names>
</name>
<name>
<surname><![CDATA[W.R.]]></surname>
<given-names><![CDATA[Rutgers]]></given-names>
</name>
<name>
<surname><![CDATA[H.F.A.]]></surname>
<given-names><![CDATA[Verhaart]]></given-names>
</name>
</person-group>
<source><![CDATA[Diagnostic- and Condition Assessment-Techniques for Condition Based Maintenance]]></source>
<year></year>
<conf-name><![CDATA[ Conference on Electrical Insulation and Dielectric Phenomena, 15-18]]></conf-name>
<conf-date>2000</conf-date>
<conf-loc>Victoria, BC, Canadá </conf-loc>
</nlm-citation>
</ref>
<ref id="B9">
<label>9</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[FLORES]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Vida de transformadores de potencia sumergidos en aceite: Situación actual. Parte II. Correlación entre resultados de ensayos físico-químicos]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[MOMBELLO]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[RATTÁ]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[JARDINI]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
</person-group>
<source><![CDATA[IEEE LATIN AMERICA TRANSACTIONS]]></source>
<year>2007</year>
<volume>5</volume>
<numero>8</numero>
<issue>8</issue>
<page-range>591-8</page-range></nlm-citation>
</ref>
<ref id="B10">
<label>10</label><nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[LIN]]></surname>
<given-names><![CDATA[CHAOHUI]]></given-names>
</name>
<name>
<surname><![CDATA[ZHANG]]></surname>
<given-names><![CDATA[BIDE]]></given-names>
</name>
<name>
<surname><![CDATA[YUAN]]></surname>
<given-names><![CDATA[YUCHUN]]></given-names>
</name>
</person-group>
<source><![CDATA[The Aging Diagnosis of Solid Insulation for Oil-Immersed Power Transformers and Its Remaining Life Prediction]]></source>
<year></year>
<conf-name><![CDATA[ Power and Energy Engineering Conference (APPEEC), 28-31]]></conf-name>
<conf-date>2010</conf-date>
<conf-loc>Asia-Pacific, Chengdu, China </conf-loc>
</nlm-citation>
</ref>
<ref id="B11">
<label>11</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[HILL]]></surname>
<given-names><![CDATA[LE T.]]></given-names>
</name>
<name>
<surname><![CDATA[DARVENIZA M.]]></surname>
<given-names><![CDATA[SAHA T]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A Study of Degradation of Cellulosic Insulation Materials in a Power Transformer. Part 3. Degradation Products of Cellulose Insulation paper]]></article-title>
<source><![CDATA[Polymer Degradation and Stability]]></source>
<year>1996</year>
<volume>51</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>211-8</page-range></nlm-citation>
</ref>
<ref id="B12">
<label>12</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[CHEIM]]></surname>
<given-names><![CDATA[LUIZ]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Furan Analysis for Liquid Power Transformers]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[PLATTS]]></surname>
<given-names><![CDATA[DONALD]]></given-names>
</name>
<name>
<surname><![CDATA[Prevost]]></surname>
<given-names><![CDATA[Thomas]]></given-names>
</name>
<name>
<surname><![CDATA[Xu]]></surname>
<given-names><![CDATA[Shuzhen]]></given-names>
</name>
</person-group>
<source><![CDATA[IEEE Electrical Insulation Magazine]]></source>
<year>2012</year>
<volume>28</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>8-21</page-range></nlm-citation>
</ref>
<ref id="B13">
<label>13</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[HEYWOOD]]></surname>
<given-names><![CDATA[EMSLEY A. M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Degradation of Cellulosic Insulation in Power Transformer. Part 2: Formation of Furan Products in Insulating Oil]]></article-title>
<source><![CDATA[IEE Proceedings - Science, Measurement and Technology]]></source>
<year>2000</year>
<volume>147</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>110-4</page-range></nlm-citation>
</ref>
<ref id="B14">
<label>14</label><nlm-citation citation-type="book">
<source><![CDATA[Life time evaluation of transformers]]></source>
<year>1993</year>
<volume>150</volume>
<page-range>39-51</page-range><publisher-name><![CDATA[WORKING GROUP 09 OF STUDY COMMITTEE 12. (WG 12.09)]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B15">
<label>15</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[VIJAYA]]></surname>
<given-names><![CDATA[KUMARI S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Remaining life assessment of power transformers]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[VISWANATH]]></surname>
<given-names><![CDATA[G.R.]]></given-names>
</name>
<name>
<surname><![CDATA[DHEEPALAKSHMI DWARAKANATH]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
<name>
<surname><![CDATA[TRIPATHY]]></surname>
<given-names><![CDATA[A. K.]]></given-names>
</name>
</person-group>
<source><![CDATA[Water and Energy International]]></source>
<year>2008</year>
<volume>65</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>30-3</page-range><publisher-loc><![CDATA[Bangalore, India, Cigré ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B16">
<label>16</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[MITCHELL]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Degradation of electrical insulating paper monitored with high performance liquid chromatography]]></article-title>
<source><![CDATA[IEEE Transactions on Electric Insulation]]></source>
<year>1990</year>
<volume>25</volume>
<page-range>737-46</page-range></nlm-citation>
</ref>
<ref id="B17">
<label>17</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[ALTMAN]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Fire protection aspects of transformers in electrical plants]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[PFEIFFER]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[Siemens Power Eng.]]></source>
<year>1984</year>
<volume>6</volume>
<numero>3</numero>
<issue>3</issue>
</nlm-citation>
</ref>
<ref id="B18">
<label>18</label><nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[PAHLAVANPOUR]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<name>
<surname><![CDATA[EKULD]]></surname>
<given-names><![CDATA[DR]]></given-names>
</name>
<name>
<surname><![CDATA[MARTINS]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Insulating paper aging and furfural formation]]></source>
<year></year>
<conf-name><![CDATA[ the Electrical Insulation Conference and Electrical Manufacturing &amp; Coil Winding Technology]]></conf-name>
<conf-date>October 2003</conf-date>
<conf-loc>Indianapolis, Indiana, USA </conf-loc>
</nlm-citation>
</ref>
<ref id="B19">
<label>19</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[JOHN]]></surname>
<given-names><![CDATA[R. SANS]]></given-names>
</name>
</person-group>
<source><![CDATA[Large-scale survey of furanic compounds in operating transformers and implications for estimating service life]]></source>
<year>1998</year>
<volume>2</volume>
<page-range>706-9</page-range><publisher-loc><![CDATA[Arlington, VA USA ]]></publisher-loc>
<publisher-name><![CDATA[presented at the IEEE International Symposium on Electrical Insulation]]></publisher-name>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
