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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">mirtr</journal-id><journal-title-group><journal-title xml:lang="ru">Мир транспорта</journal-title><trans-title-group xml:lang="en"><trans-title>World of Transport and Transportation</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1992-3252</issn><publisher><publisher-name>Russian University of Transport (RUT)</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">mirtr-415</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>НАУКА И ТЕХНИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>SCIENCE AND ENGINEERING</subject></subj-group></article-categories><title-group><article-title>СОПРОТИВЛЕНИЯ ОБМОТОК ПРИ ПАРАЛЛЕЛЬНОЙ РАБОТЕ ТРАНСФОРМАТОРОВ</article-title><trans-title-group xml:lang="en"><trans-title>RESISTANCE OF WINDING DURING PARALLEL OPERATION OF TRANSFORMERS</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Григорьев</surname><given-names>Н. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Grigoriev</surname><given-names>N. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат технических наук, доцент кафедры «Электротехника, метрология и электроэнергетика»</p><p>+7–495–6842119</p></bio><bio xml:lang="en"><p>Ph.D. (Tech), associate professor at the department of electrical engineering, metrology and electrical power engineering</p><p>+7–495–6842119</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Московский государственный университет путей сообщения (МИИТ), Москва</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Moscow State University of Railway Engineering (MIIT), Moscow</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2013</year></pub-date><pub-date pub-type="epub"><day>28</day><month>08</month><year>2013</year></pub-date><volume>0</volume><issue>4</issue><fpage>58</fpage><lpage>63</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Григорьев Н.Д., 2013</copyright-statement><copyright-year>2013</copyright-year><copyright-holder xml:lang="ru">Григорьев Н.Д.</copyright-holder><copyright-holder xml:lang="en">Grigoriev N.D.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://mirtr.elpub.ru/jour/article/view/415">https://mirtr.elpub.ru/jour/article/view/415</self-uri><abstract><p>Публикуемый дискуссионный материал выражает несогласие с существующей точкой зрения на то, что уравнительный ток, протекающий по первичным и вторичным обмоткам трехфазных понижающих трансформаторов 12 и 11 групп, когда они работают параллельно, ограничивается по величине суммой сопротивлений короткого замыкания. Оценочная инерция не учитывает, в частности, известное всем обстоятельство: в одной и той же трехфазной цепи имеются соединения элементов в звезду и треугольник. Как раз с учетом этого автор доказывает, что использование его формул взамен прежних снижает погрешности в расчетах проектируемых трансформаторов. </p></abstract><trans-abstract xml:lang="en"><p>The debatable article expresses disagreement with existing opinion that compensating current (also known as balancing, cross, equalizing, phasing, restoring, circulating current – ed.note) which flows through primary and secondary winding of three-phase step-down parallel operated transformers of groups 12 and 11 (Y/Y-12, Y/D-11), is value-restricted by the sum of short-circuit resistances. In particular the inertia of customary approach of assessment doesn’t allow taking into account the well-known factor of coexistence within the same three-phase circuit of star (Y, can also be called T – ed.note) and triangle-shaped (Δ or D – ed.note) connections. Taking into consideration exactly this factor the author substantiates that the formulae, suggested by him to replace previously used equations, might reduce inaccuracy of computation during engineering of new transformers.</p><p>Following the computation of parameters of secondary D-shaped winding of three-phase step-down transformer, the author, in order to realize computations for Y-connections, has elaborated formulae of determination of balancing current for blank cycle of two parallel operated three-phase step-down transformers with diagrams and groups of windings Y/Y-12 и Y/D-11. Their difference from known formulae consists in the fact that resistance or relative value (in %) of a short-circuit current are reduced by a third. Denominator of formulae, used to determine balancing current, in view of assumed conditions, includes substitutional value of the sum of resistance or of relative values (in %) of short-circuit current of three-phase step-down transformer with Y/Y-12 winding connections or diagrams and 2/3 of the value of resistance or relative value (in %) of short-circuit current of three-phase step-down transformer with Y/D-11 winding connections or diagrams.</p><p>The reliability of suggested formulae is confirmed by measurements of balancing current under blank cycle mode of two parallel operated three-phase step-down transformers TS-2,5/0,5 with Y/Y-12 и Y/D-11 winding diagrams and connections. Difference between calculated value and measured value of current was of 1,93%.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>транспортная энергосеть</kwd><kwd>трехфазный понижающий трансформатор</kwd><kwd>обмотки</kwd><kwd>закон Ома</kwd><kwd>уравнительный ток</kwd><kwd>сопротивление</kwd><kwd>короткое замыкание</kwd><kwd>напряжение</kwd><kwd>расчетные и измеряемые величины</kwd><kwd>новые формулы</kwd></kwd-group><kwd-group xml:lang="en"><kwd>transport power network</kwd><kwd>three-phase step-down transformer</kwd><kwd>winding</kwd><kwd>Ohm law</kwd><kwd>compensating current</kwd><kwd>resistance</kwd><kwd>impedance</kwd><kwd>short-circuit</kwd><kwd>calculated and measured values</kwd><kwd>new formulae</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Вольдек А. И. Электрические машины. – Л.: Энергия, 1974. – 832 с. Vol’dek A. I. 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