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首页> 外文期刊>Power Engineering Review, IEEE >Three Dimensional Flux Calculation on a Three-Phase Transformer
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Three Dimensional Flux Calculation on a Three-Phase Transformer

机译：三相变压器的三维通量计算

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Increases in the ratings of large power transformers have demanded more accurate methods of predicting leakage fields which give rise to excessive losses in the devices. This paper addresses the issue, giving the development of a technique which can be used with minimal computing power to determine the distribution of the magnetic fluxes. Estimates for the additional stray load losses in the iron parts can be calculated with reasonable accuracy after the flux distribution has been found. For developing large transformers and reactors, it is necessary to know the distribution of the magnetic leakage field to calculate the electro-dynamic forces and the stray losses due to eddy currents in the winding conductors and in steel parts such as core, tank, pressing beams, etc. In general, the magnetic field in the transformer is calculated using the assumption that the structure is two-dimensional. But actual transformers are three-dimensional. Thus, the customary two-dimensional approximations are inadequate. In this paper, the three-dimensional magnetic flux distribution on the tank wall of a three phase transformer has been calculated. In order to perform the calculation, a finite element scheme has been adopted to obtain a two-dimensional solution at 15 meridian planes of the transformer coil of a single phase transformer for any arbitrary value of current density. Using the actual values of current densities, the magnetic field has been computed for each phase at two selected instants of time in the cycle. Then, the results are manipulated to obtain an overall solution.
机译：大型电力变压器的额定值的增加已经要求有更准确的预测泄漏场的方法，该泄漏场会导致设备中的过多损耗。本文解决了这个问题，提出了一种技术，该技术可以用最少的计算能力来确定磁通量的分布。在找到通量分布之后，可以合理的精度计算出铁零件中额外杂散负载损耗的估计值。为了开发大型变压器和电抗器，有必要知道漏磁场的分布，以计算电动动力和绕组导体中以及铁心，储罐，压制梁等钢制零件中由于涡流引起的杂散损耗。通常，使用结构为二维的假设来计算变压器中的磁场。但是实际的变压器是三维的。因此，常规的二维近似是不充分的。本文计算了三相变压器油箱壁上的三维磁通量分布。为了进行计算，对于任何电流密度的任意值，已经采用有限元方案在单相变压器的变压器线圈的15个子午面处获得二维解。使用电流密度的实际值，已在周期中两个选定的时间点为每个相计算了磁场。然后，操纵结果以获得整体解决方案。

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