Axial internal forces in power transformer active part elements under windings clamping, variation of temperature and insulating materials moisture content

Axial internal forces in power transformer active part elements under windings clamping, variation of temperature and insulating materials moisture content

The paper examines core type transformers in which windings clamping and magnetic system end yokes clamping is accomplished by means of the same yoke beams. With regard to forces of friction between the yoke beams and the yoke there were obtained expressions for internal forces in the active part el...

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Date:2014
Main Author: Лазарев, И. В.
Format: Article
Language:Russian
Published: Інститут енергетичних машин і систем ім. А. М. Підгорного Національної академії наук України 2014
Subjects:
transformer
winding
axial forces
operation
shipment
moisture content
УДК 621.314.21.045.001.5
Online Access:https://journals.uran.ua/jme/article/view/31403
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Journal Title:Energy Technologies & Resource Saving

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Energy Technologies & Resource Saving
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spelling oai:ojs.journals.uran.ua:article-314032015-04-01T16:14:18Z Axial internal forces in power transformer active part elements under windings clamping, variation of temperature and insulating materials moisture content Осевые усилия в элементах активной части силового трансформатора при запрессовке обмоток, изменении температуры и влагосодержания изоляционных материалов Лазарев, И. В. transformer winding axial forces operation shipment moisture content УДК 621.314.21.045.001.5 трансформатор обмотка осевые силы эксплуатация транспортировка влагосодержание УДК 621.314.21.045.001.5 трансформатор обмотка осьові сили експлуатація транспортування вміст вологи УДК 621.314.21.045.001.5 The paper examines core type transformers in which windings clamping and magnetic system end yokes clamping is accomplished by means of the same yoke beams. With regard to forces of friction between the yoke beams and the yoke there were obtained expressions for internal forces in the active part elements under variation of their temperature and insulating materials moisture content. Based on numerical analysis, there was studied influence of variation of active part elements temperature and insulating material moisture content upon the internal forces in windings. It was demonstrated, that internal axial forces in windings reduce after clamping as the transformer cools to room temperature. Subsequent heating in operation compensates for this drop. Windings clamping forces may reduce to dangerous levels during shipment at low temperatures causing the windings to shift due to accelerations. If left for a prolonged period in a relatively humid environment, the windings in the active part may build high internal axial forces due to moisture content increase in insulation materials causing damage to the clamping structure. Рассмотрены трансформаторы стержневого типа, в которых прессовка обмоток и торцовых ярм магнитной системы осуществляется с помощью одних и тех же ярмовых балок. С учетом сил трения между ярмовыми балками и ярмом определены усилия в элементах активной части при изменении их температуры и влагосодержания изоляционных материалов. На числовых примерах изучено влияние на усилия в обмотках изменения температуры элементов активной части и влагосодержания в изоляционных материалах. Розглянуто трансформатори стрижневого типу, в яких пресування обмоток і торцевих ярем магнітної системи здійснюється за допомогою одних і тих же ярмових балок. З урахуванням сил тертя між ярмовими балками і ярмом визначено зусилля в елементах активної частини при змінюванні їх температури та вмісту вологи ізоляційних матеріалів. На числових прикладах вивчено вплив на зусилля в обмотках змінювання температури елементів активної частини та вмісту вологи в ізоляційних матеріалах. Інститут енергетичних машин і систем ім. А. М. Підгорного Національної академії наук України 2014-11-28 Article Article application/pdf https://journals.uran.ua/jme/article/view/31403 Journal of Mechanical Engineering; Vol. 17 No. 3 (2014); 38-44 Проблемы машиностроения; Том 17 № 3 (2014); 38-44 Проблеми машинобудування; Том 17 № 3 (2014); 38-44 2709-2992 2709-2984 ru https://journals.uran.ua/jme/article/view/31403/36452 Copyright (c) 2015 И. В. Лазарев https://creativecommons.org/licenses/by-nd/4.0
institution Energy Technologies & Resource Saving
baseUrl_str
datestamp_date 2015-04-01T16:14:18Z
collection OJS
language Russian
topic transformer
winding
axial forces
operation
shipment
moisture content
УДК 621.314.21.045.001.5
spellingShingle transformer
winding
axial forces
operation
shipment
moisture content
УДК 621.314.21.045.001.5
Лазарев, И. В.
Axial internal forces in power transformer active part elements under windings clamping, variation of temperature and insulating materials moisture content
topic_facet transformer
winding
axial forces
operation
shipment
moisture content
УДК 621.314.21.045.001.5
трансформатор
обмотка
осевые силы
эксплуатация
транспортировка
влагосодержание
УДК 621.314.21.045.001.5
трансформатор
обмотка
осьові сили
експлуатація
транспортування
вміст вологи
УДК 621.314.21.045.001.5
format Article
author Лазарев, И. В.
author_facet Лазарев, И. В.
author_sort Лазарев, И. В.
title Axial internal forces in power transformer active part elements under windings clamping, variation of temperature and insulating materials moisture content
title_short Axial internal forces in power transformer active part elements under windings clamping, variation of temperature and insulating materials moisture content
title_full Axial internal forces in power transformer active part elements under windings clamping, variation of temperature and insulating materials moisture content
title_fullStr Axial internal forces in power transformer active part elements under windings clamping, variation of temperature and insulating materials moisture content
title_full_unstemmed Axial internal forces in power transformer active part elements under windings clamping, variation of temperature and insulating materials moisture content
title_sort axial internal forces in power transformer active part elements under windings clamping, variation of temperature and insulating materials moisture content
title_alt Осевые усилия в элементах активной части силового трансформатора при запрессовке обмоток, изменении температуры и влагосодержания изоляционных материалов
description The paper examines core type transformers in which windings clamping and magnetic system end yokes clamping is accomplished by means of the same yoke beams. With regard to forces of friction between the yoke beams and the yoke there were obtained expressions for internal forces in the active part elements under variation of their temperature and insulating materials moisture content. Based on numerical analysis, there was studied influence of variation of active part elements temperature and insulating material moisture content upon the internal forces in windings. It was demonstrated, that internal axial forces in windings reduce after clamping as the transformer cools to room temperature. Subsequent heating in operation compensates for this drop. Windings clamping forces may reduce to dangerous levels during shipment at low temperatures causing the windings to shift due to accelerations. If left for a prolonged period in a relatively humid environment, the windings in the active part may build high internal axial forces due to moisture content increase in insulation materials causing damage to the clamping structure.
publisher Інститут енергетичних машин і систем ім. А. М. Підгорного Національної академії наук України
publishDate 2014
url https://journals.uran.ua/jme/article/view/31403
work_keys_str_mv AT lazareviv axialinternalforcesinpowertransformeractivepartelementsunderwindingsclampingvariationoftemperatureandinsulatingmaterialsmoisturecontent
AT lazareviv osevyeusiliâvélementahaktivnojčastisilovogotransformatoraprizapressovkeobmotokizmeneniitemperaturyivlagosoderžaniâizolâcionnyhmaterialov
first_indexed 2025-07-17T11:59:05Z
last_indexed 2025-07-17T11:59:05Z
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