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Определение деформаций проводов обмотки трансформатора, вызванных током короткого замыкания

Определение деформаций проводов обмотки трансформатора, вызванных током короткого замыкания

Abstract

Consideration of longitudinal and cross deformations of the conductor of a winding of the transformer, caused by current of short circuit is given. The conclusion of the main useful ratios, allowing to estimate lengthening and shift of conductors in a winding at known current is considered, and also calculation of a field of distribution of spatial deformation of conductors is given in a lonely winding. In work the example of calculation of distribution of ponderomotive forces for conductors of a winding of the transformer of round and rectangular section of c is given by use of a method of final elements. For calculation of distribution of ponderomotive forces the system of the equations of Maxwell and a tensor of a tension of Maxwell was used. For realization of a method of final elements the COMSOL Multiphysics package was used. In the given model the current of short circuit exceeding current of a normal mode by 3 times was considered. Distribution of vector magnetic potential of A, distribution of superficial forces of F and the resultant forces operating on the separate conductor is given.

Приводится рассмотрение продольных и поперечных деформаций проводника обмотки трансформатора, вызванных током короткого замыкания. Рассматривается вывод основных полезных соотношений, позволяющих оценить удлинения и сдвиг проводников в обмотке при известном токе, а также приведен расчет поля распределения пространственной деформации проводников в уединенной обмотке. В работе приведен пример расчета распределения пондеромоторных сил для проводников обмотки трансформатора круглого и прямоугольного сечения c использованием метода конечных элементов. Для расчета распределения пондеромоторных сил была использована система уравнений Максвелла и тензор натяжения Максвелла. Для реализации метода конечных элементов был использован пакет COMSOL Multiphysics. В приведенной модели рассматривался ток короткого замыкания, превышающий ток нормального режима в 3 раза. Приведено распределение векторного магнитного потенциала A, распределение поверхностных сил F и результирующие силы, действующие на отдельный проводник.

Keywords

ТЕНЗОР НАТЯЖЕНИЯ МАКСВЕЛЛА., УРАВНЕНИЕ МАКСВЕЛЛА, МЕХАНИЧЕСКОЕ НАПРЯЖЕНИЕ, ПОНДЕРОМОТОРНЫЕ СИЛЫ, РАСПРЕДЕЛЕННЫЕ ЕМКОСТИ, ПРОДОЛЬНЫЕ И ПОПЕРЕЧНЫЕ ДЕФОРМАЦИИ, ДИАГНОСТИКА ТРАНСФОРМАТОРА, ОБМОТКИ ТРАНСФОРМАТОРА, MAXWELL’S TENSOR., MAXWELL’S EQUATIONS

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
gold