Thermal design of large oil-immersed transformer is the key to guarantee its safe operation. However, the thermal design is a coupled problem including electromagnetic, oil flow and thermal performance of the transformer. Consequently, thermal design is a comprehensive multi-physics fields design process. In this paper, the comprehensive thermal analysis of the structure parts and winding area are respectively carried on. An electromagnetic-fluid-thermal coupled approach is proposed. In addition, the use of an arrangement of wall shunts and winding oil baffles are proposed to reduce significantly the transformer temperature rises. The temperature rises of the transformer with the improved structure are computed by multi-physics coupled analyses to verify the structural modifications. Finally, an experimental prototype is established, the multi-physics analysis results are verified with the experimental ones. By analyzing the electromagnetic, thermal, and fluidic characteristics comprehensively, the synthetic performance and calculation accuracy of the whole transformer can thus be guaranteed.

中文翻译：

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基于多物理场分析的油浸式自耦变压器综合热分析

大型油浸式变压器的热设计是保证其安全运行的关键。然而，热设计是一个耦合问题，包括变压器的电磁、油流和热性能。因此，热设计是一个综合的多物理场设计过程。本文分别对结构件和绕组区域进行综合热分析。提出了一种电磁-流体-热耦合方法。此外，建议使用壁式分流器和绕组油挡板的布置以显着降低变压器温升。通过多物理场耦合分析计算具有改进结构的变压器的温升，以验证结构修改。最后，建立了一个实验原型，多物理场分析结果与实验结果相验证。通过综合分析电磁、热、流体特性，从而保证整个变压器的综合性能和计算精度。