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Investigation of Asymmetrical Modes of Three-Phase Three Leg Combined Transformer-Phase-Shifter / Investigarea modurilor asimetrice a transformatorului-regulator de fază combinat cu trei faze şi miez din trei coloane / Исследование несимметричных режимов трехфазного трехстержневого трансформатора-фазорегулятора

On the base of previously proposed model of three-phase three leg transformer windings connection scheme for combined transformer-phase shifter was made, for which calculations and analysis of specific characteristics of different steady state asymmetric modes were performed. At this the electromagn...

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Published in:Problems of the regional energetics 2015-01, Vol.2015 (2)
Main Authors: Suslov, V M, Bosneaga, V A
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description On the base of previously proposed model of three-phase three leg transformer windings connection scheme for combined transformer-phase shifter was made, for which calculations and analysis of specific characteristics of different steady state asymmetric modes were performed. At this the electromagnetic coupling of the windings, located on different legs of transformer core was taken into account. As the base 10 kV transformer was used, and different short circuits, combined with phase failures at feeding source were investigated. For the considered regimes vectorial diagrams for windings currents, voltages and relative values of magnetic fluxes in the legs and zero sequence magnetic flux, flows out of magnetic circuit, were constructed, giving clear idea about their particular features. În baza modelului transformatorului trifazat cu trei coloane, propus anterior, a fost realizată schema transformatorului-regulatorului de fază combinat, efectuate calculele şi cercetările a regimurilor staţionare nesimetrice a dispozitivului dat, ţinând cont de legătura mutuală electromagnetica dintre înfăşurările amplasate pe diferite coloane. Folosind ca exemplu transformatorul de distribuţie 10 kV s-au efectuat calcule şi analiză celor mai caracteristice regimuri permanente nesimetrice, care apar la scurt-circuit, combinate cu rupturi de faze a sursei de alimentare. Pentru regimurile examinate sunt construite diagrame vectoriale pentru curenţi şi tensiuni, precum şi privind valorile relative ale fluxurilor magnetice in coloane şi de secvenţă homopolară, care oferă o imagine clară privind caracteristicile specifice ale acestor regimuri. На основе предложенной ранее модели трехфазного трансформатора с трехстержневой конструкцией магнитопровода собрана схема совмещенного трансформатора-фазорегулятора, проведены расчеты и изучены особенности различных установившихся несимметричных режимов работы данной схемы с учетом электромагнитной связи обмоток, расположенных на различных стержнях. Расчеты и анализ проведены на примере трансформатора 10 кВ и включают рассмотрение несимметричных режимов, возникающих при различных коротких замыканиях, сочетающихся с обрывом фаз на стороне источника питания. Для рассмотренных режимов построены векторные диаграммы токов и напряжений, а также относительных значений магнитных потоков в стержнях и потока нулевой последовательности, которые дают наглядное представление об их особенностях.
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At this the electromagnetic coupling of the windings, located on different legs of transformer core was taken into account. As the base 10 kV transformer was used, and different short circuits, combined with phase failures at feeding source were investigated. For the considered regimes vectorial diagrams for windings currents, voltages and relative values of magnetic fluxes in the legs and zero sequence magnetic flux, flows out of magnetic circuit, were constructed, giving clear idea about their particular features. În baza modelului transformatorului trifazat cu trei coloane, propus anterior, a fost realizată schema transformatorului-regulatorului de fază combinat, efectuate calculele şi cercetările a regimurilor staţionare nesimetrice a dispozitivului dat, ţinând cont de legătura mutuală electromagnetica dintre înfăşurările amplasate pe diferite coloane. Folosind ca exemplu transformatorul de distribuţie 10 kV s-au efectuat calcule şi analiză celor mai caracteristice regimuri permanente nesimetrice, care apar la scurt-circuit, combinate cu rupturi de faze a sursei de alimentare. Pentru regimurile examinate sunt construite diagrame vectoriale pentru curenţi şi tensiuni, precum şi privind valorile relative ale fluxurilor magnetice in coloane şi de secvenţă homopolară, care oferă o imagine clară privind caracteristicile specifice ale acestor regimuri. На основе предложенной ранее модели трехфазного трансформатора с трехстержневой конструкцией магнитопровода собрана схема совмещенного трансформатора-фазорегулятора, проведены расчеты и изучены особенности различных установившихся несимметричных режимов работы данной схемы с учетом электромагнитной связи обмоток, расположенных на различных стержнях. 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subjects Coils (windings)
Electromagnetic coupling
Legs
Magnetic circuits
Magnetic flux
Phase shifters
Phase transitions
Short circuits
Transformers
title Investigation of Asymmetrical Modes of Three-Phase Three Leg Combined Transformer-Phase-Shifter / Investigarea modurilor asimetrice a transformatorului-regulator de fază combinat cu trei faze şi miez din trei coloane / Исследование несимметричных режимов трехфазного трехстержневого трансформатора-фазорегулятора
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