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首页> 外文期刊>Electric power systems research >Air temperature effect on thermal models for ventilated dry-type transformers
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Air temperature effect on thermal models for ventilated dry-type transformers

机译:空气温度对通风型干式变压器热模型的影响

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The temperature of the air surrounding the windings of ventilated dry-type transformers is an important factor in the cooling of the windings since they are cooled only by the air. In particular, inner windings are sensitive to the air temperature in vertical cooling ducts. This study presents air temperature effect on the temperatures in foil-type inner winding for the dry-type transformers. A transformer rated at 2000 kVA was selected for the research and temperature distribution was calculated under constant and varying air temperatures inside vertical ducts at three different loads. The 2-D transient heat diffusion equation was solved using the finite element method by coupling it with the vector potential equation due to non-uniformly generated heat caused by eddy currents in the foil winding. The calculated temperatures at constant and varying air temperatures are presented together with experimental values. The numerical and experimental results of this study showed that the air temperature affects the accuracy of temperatures in foil-type inner winding greatly.
机译:通风的干式变压器绕组周围的空气温度是绕组冷却的重要因素,因为它们仅通过空气冷却。特别地,内部绕组对垂直冷却管道中的空气温度敏感。这项研究提出了空气温度对干式变压器的箔式内绕组温度的影响。选择了额定功率为2000 kVA的变压器进行研究,并在三种不同负载下垂直管道内恒定且变化的空气温度下计算了温度分布。二维瞬态热扩散方程使用有限元方法求解,将其与矢量电势方程耦合,这是由于箔绕组中涡流引起的热量产生不均匀所致。给出了恒定和变化的空气温度下的计算温度以及实验值。数值研究和实验结果表明,空气温度对箔式内绕组温度的精度影响很大。

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