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<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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Analitika</journal-id><journal-title-group><journal-title xml:lang="en">Analitika</journal-title><trans-title-group xml:lang="ru"><trans-title>Аналитика</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2227-572X</issn><issn publication-format="electronic">2687-1351</issn><publisher><publisher-name xml:lang="en">Technosphera JSC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">631374</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Analytical Methods and Instruments</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Аналитические методы и приборы</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Assessment of the Degree of Aging of Internal Insulation of Power Transformers by Methanol Content in Transformer Oil</article-title><trans-title-group xml:lang="ru"><trans-title>Оценка степени старения внутренней изоляции силовых трансформаторов по содержанию метанола в трансформаторном масле</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Daryan</surname><given-names>L. A.</given-names></name><name xml:lang="ru"><surname>Дарьян</surname><given-names>Л. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="ru"><p>доктор технических наук</p> <p> </p></bio><email>journal@electronics.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Maksimchenko</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Максимченко</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>journal@electronics.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Astakhov</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Астахов</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>astahov-av@meta-chrom.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Rzhavin</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Ржавин</surname><given-names>М. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>astahov-av@meta-chrom.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en"></institution></aff><aff><institution xml:lang="ru">АО «Техническая инспекция ЕЭС»</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en"></institution></aff><aff><institution xml:lang="ru">ООО «НПФ «Мета-хром»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-08-21" publication-format="electronic"><day>21</day><month>08</month><year>2023</year></pub-date><volume>13</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>274</fpage><lpage>280</lpage><history><date date-type="received" iso-8601-date="2024-04-28"><day>28</day><month>04</month><year>2024</year></date><date date-type="accepted" iso-8601-date="2024-04-28"><day>28</day><month>04</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Daryan L.A., Maksimchenko A.V., Astakhov A.V., Rzhavin M.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Дарьян Л.А., Максимченко А.В., Астахов А.В., Ржавин М.В.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Daryan L.A., Maksimchenko A.V., Astakhov A.V., Rzhavin M.V.</copyright-holder><copyright-holder xml:lang="ru">Дарьян Л.А., Максимченко А.В., Астахов А.В., Ржавин М.В.</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/2227-572X/article/view/631374">https://journals.eco-vector.com/2227-572X/article/view/631374</self-uri><abstract xml:lang="en"><p>Power transformers are one of the main and expensive types of equipment for power stations and substations. Over the past two decades, there has been an aging trend in the fleet of transformer equipment all over the world [1]. Therefore, to support the reliable functioning of power transformers (PT), it is necessary to develop methods for diagnosing their condition, which will allow detecting developing damage at an early stage. In addition, of considerable interest are the indicators of aging of internal insulation to assess its residual life and the service life of the ST. A method for determining methanol in transformer oil as a marker of paper insulation aging in power transformers is proposed.</p></abstract><trans-abstract xml:lang="ru"><p>Силовые трансформаторы – один из основных и дорогостоящих видов оборудования электрических станций и подстанций. Последние два десятилетия во всем мире наблюдается тенденция старения парка трансформаторного оборудования [1]. Поэтому для поддержания эксплуатационной надежности силовых трансформаторов (СТ) необходимо разрабатывать методы диагностики их состояния, которые позволят обнаружить развивающиеся повреждения на ранней стадии их развития. Кроме того, значительный интерес представляют показатели старения внутренней изоляции для оценки ее остаточного ресурса и срока службы СТ. Предложена методика определения метанола в трансформаторном масле как маркера старения бумажной изоляции в силовых трансформаторах.</p></trans-abstract><kwd-group xml:lang="en"><kwd>power transformers</kwd><kwd>insulating paper</kwd><kwd>transformer oil</kwd><kwd>viscosity</kwd><kwd>methanol</kwd><kwd>gas chromatograph</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>силовые трансформаторы</kwd><kwd>изоляционная бумага</kwd><kwd>трансформаторное масло</kwd><kwd>степень полимеризации</kwd><kwd>метанол</kwd><kwd>газовый хроматограф</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Алексеев Б. А. Крупные силовые трансформаторы: контроль состояния в работе и при ревизии. М.: Энергопрогресс, 2010. 88 с. (Библиотечка электротехника, приложение к журналу «Энергетик», Вып. 1 (133).</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Alekseev B. A. 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