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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">ipolytech</journal-id><journal-title-group><journal-title xml:lang="ru">iPolytech Journal</journal-title><trans-title-group xml:lang="en"><trans-title>iPolytech Journal</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2782-4004</issn><issn pub-type="epub">2782-6341</issn><publisher><publisher-name>Irkutsk National Research Technical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21285/1814-3520-2022-3-519-531</article-id><article-id custom-type="elpub" pub-id-type="custom">ipolytech-633</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>ЭНЕРГЕТИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>POWER ENGINEERING</subject></subj-group></article-categories><title-group><article-title>Математическая модель теплового режима воздушной линии электропередачи с учетом изменения температуры по длине</article-title><trans-title-group xml:lang="en"><trans-title>Mathematical model of the thermal mode of overhead power lines considering temperature variations along the line length</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4250-371X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Троценко</surname><given-names>В. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Trotsenko</surname><given-names>V. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Троценко Владислав Михайлович, старший преподаватель кафедры электроснабжения промышленных предприятий, Энергетический институт</p><p>644046, г. Омск, пр. Маркса, 35, Россия</p></bio><bio xml:lang="en"><p>Vladislav M. Trotsenko, Senior Lecturer of the Department of Power Supply of Industrial Enterprises, Energy Institute</p><p>11 Mira pr., Omsk 644050, Russia</p></bio><email xlink:type="simple">roch_93@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0650-1880</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гиршин</surname><given-names>С. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Girshin</surname><given-names>S. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гиршин Станислав Сергеевич, кандидат технических наук, доцент, доцент кафедры электроснабжения промышленныхпредприятий, Энергетический институт</p><p>644046, г. Омск, пр. Маркса, 35, Россия</p></bio><bio xml:lang="en"><p>Stanislav S. Girshin, Cand. Sci. (Eng.), Associate Professor, Associate Professor of the Department of Power Supply of Industrial Enterprises, Energy Institute</p><p>11 Mira pr., Omsk 644050, Russia</p></bio><email xlink:type="simple">stansg@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7866-5630</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Петрова</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Petrova</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Петрова Елена Владимировна, старший преподаватель кафедры электроснабжения промышленных предприятий, Энергетический институт</p><p>644046, г. Омск, пр. Маркса, 35, Россия</p></bio><bio xml:lang="en"><p>Elena V. Petrova, Senior Lecturer of the Department of Power Supply of Industrial Enterprises, Energy Institute</p><p>11 Mira pr., Omsk 644050, Russia</p></bio><email xlink:type="simple">evpetrova2000@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1981-3338</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сидоров</surname><given-names>О. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Sidorov</surname><given-names>O. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сидоров Олег Алексеевич, доктор технических наук, профессор, профессор кафедры электроснабжения железнодорожного транспорта</p><p>644046, г. Омск, пр. Маркса, 35, Россия</p></bio><bio xml:lang="en"><p>Oleg A. Sidorov, Dr. Sci. (Eng.), Professor, Professor of the Department of Railway Transport Power Supply</p><p>35 Marksa pr., Omsk 644046, Russia</p></bio><email xlink:type="simple">SidorovOA@omgups.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6232-1382</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Румянцева</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Rumyantseva</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Румянцева Евгения Викторовна, кандидат технических наук, доцент кафедры электроснабжения промышленных предприятий, Энергетический институт</p><p>644050, г. Омск, пр. Мира, 11, Россия</p></bio><bio xml:lang="en"><p>Evgeniya V. Rumyantseva, Cand. Sci. (Eng.), Associate Professor of the Department of Power Supply of Industrial Enterprises, Energy Institute</p><p>11 Mira pr., Omsk 644050, Russia</p></bio><email xlink:type="simple">eka30981@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Жиленко</surname><given-names>Е. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Zhilenko</surname><given-names>E. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Жиленко Елена Петровна, старший преподаватель кафедры электроснабжения промышленных предприятий, Энергетический институт</p><p>644050, г. Омск, пр. Мира, 11, Россия</p></bio><bio xml:lang="en"><p>Elena P. Zhilenko, Senior Lecturer of the Department of Power Supply of Industrial Enterprises, Energy Institute</p><p>11 Mira pr., Omsk 644050, Russia</p></bio><email xlink:type="simple">epzhilenko@omgtu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4707-2023</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Горюнов</surname><given-names>В. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Goryunov</surname><given-names>V. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Горюнов Владимир Николаевич, доктор технических наук, профессор, заведующий кафедрой электроснабжения промышленных предприятий, Энергетический институт</p><p>644050, г. Омск, пр. Мира, 11, Россия</p></bio><bio xml:lang="en"><p>Vladimir N. Goryunov, Dr. Sci. (Eng.), Professor, Head of the Department of Power Supply of Industrial Enterprises, Energy Institute</p><p>11 Mira pr., Omsk 644050, Russia</p></bio><email xlink:type="simple">vladimirgoryunov2016@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Омский государственный технический университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Omsk State Technical University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Омский государственный университет путей сообщения</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Omsk State Transport University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>08</day><month>10</month><year>2022</year></pub-date><volume>26</volume><issue>3</issue><fpage>519</fpage><lpage>531</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Троценко В.М., Гиршин С.С., Петрова Е.В., Сидоров О.А., Румянцева Е.В., Жиленко Е.П., Горюнов В.Н., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Троценко В.М., Гиршин С.С., Петрова Е.В., Сидоров О.А., Румянцева Е.В., Жиленко Е.П., Горюнов В.Н.</copyright-holder><copyright-holder xml:lang="en">Trotsenko V.M., Girshin S.S., Petrova E.V., Sidorov O.A., Rumyantseva E.V., Zhilenko E.P., Goryunov V.N.</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://ipolytech.elpub.ru/jour/article/view/633">https://ipolytech.elpub.ru/jour/article/view/633</self-uri><abstract><p>Цель – разработать математическую модель температурного режима провода воздушной линии с учетом осевой передачи тепла. Объектом исследования явились воздушные линии электропередачи. В работе использованы аналитические и численные методы решения дифференциальных уравнений, включая метод конечных разностей. Решено уравнение теплопроводности для проводов марок АС-240/32 и СИП-2 3х95+1х95 при изменении тока по длине линии. Предложено аналитическое решение уравнения теплопроводности для установившегося режима провода при одинаковом токе на всех участках линии с учетом температурной зависимости активного сопротивления. Показана достоверность полученных результатов при сравнении аналитического метода с методом конечных разностей. Установлено, что граничные условия в начале и в конце линии оказывают влияние на ее температуру лишь в пределах нескольких метров. При этом степень этого влияния несколько возрастает с увеличением тока вследствие температурной зависимости тепловыделения, но остается малой вплоть до токов аварийного уровня. Поэтому расчеты теплового режима линии не требуют задания граничных условий с высокой точностью. Показано, что в линии с равномерно распределенной нагрузкой при большом изменении тока по длине результаты отличаются. Так, абсолютная погрешность аналитического решения (по сравнению с методом конечных разностей) по максимальной температуре составляет 77,9°C, а относительная погрешность по потерям равна 10%, аналогичные погрешности расчета температуры неограниченно длинного провода как функции длины составляют 2,5°C и 0,1%. Следовательно, несмотря на высокую теплопроводность металла, модель с нулевой теплопроводностью по оси провода дает наиболее точные результаты, чем модель с бесконечно большой теплопроводностью. Полученные результаты позволяют уточнить суммарные потери активной мощности, а также оценить пропускную способность линии по максимально допустимой температуре, которая зависит от типа проводов и составляет 70°C для неизолированных сталеалюминиевых и 90°C для самонесущих изолированных проводов.</p></abstract><trans-abstract xml:lang="en"><p>A mathematical model representing the temperature mode of an overhead power line wire and taking into account the axial heat transfer was developed. Processes in overhead power lines were analyzed using analytical and numerical methods for solving differential equations, including the finite difference method. The equation of thermal conductivity for AS-240/32 and SIP-2 3х95+1х95 wires was solved for the case of current variations along the line length. An analytical solution to the equation of thermal conductivity was proposed for the steady-state operation of an overhead wire under the same current in all sections of the line, taking into account the temperature dependence of active resistance. The results obtained by the analytical method agree well with those obtained by the method of finite differences. The boundary conditions at the beginning and at the end of the line were established to affect the line temperature only within a few meters. At the same time, despite the slight increase in the degree of this effect at an increase in the current due to the temperature dependence of heat emission, it remains small up to emergency level currents. Therefore, the calculations of the line thermal mode require no high accuracy in setting boundary conditions. A line with a uniformly distributed load demonstrates differing results at large current variations along the wire length. Thus, the absolute error of the analytical solution (compared to the finite difference method) for the maximum temperature equals 77.9°C, while the relative error for losses equals 10%. The same errors in temperature calculations for an infinitely long wire in terms of the length function comprise 2.5°C and 0.1%, respectively. Therefore, despite the high thermal conductivity of a metal, a model with a zero thermal conductivity along the wire axis gives more accurate results as compared to a model with an infinitely high thermal conductivity. The obtained results are applicable when clarifying the total loss of active power, as well as for estimating the line capacity according to the maximum permissible temperature, which depends on the type of wires and comprises 70 and 90°C for uninsulated steel-aluminum and self-supporting insulated wires, respectively.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>потери мощности</kwd><kwd>температура провода</kwd><kwd>осевая передача тепла</kwd><kwd>уравнение теплопроводности</kwd><kwd>тепловой масштаб длины</kwd><kwd>метод конечных разностей</kwd></kwd-group><kwd-group xml:lang="en"><kwd>power losses</kwd><kwd>wire temperature</kwd><kwd>axial heat transfer</kwd><kwd>heat transfer equation</kwd><kwd>thermal length scale</kwd><kwd>finite difference method</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">Гиршин С. С., Троценко В. М., Горюнов В. Н., Кропотин О. 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