A two-dimensional transient fluid-thermal coupling method for temperature rising calculation of transformer winding based on finite element method

Liu, Gang; Rong, Shichang; Wu, Weige; Wang, Xiaohan; Li, Lin

doi:10.1063/1.5141130

Cited by 5 publications

(1 citation statement)

References 22 publications

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“…It is well known that the thermal model of lumped parameters cannot identify the local temperature variation in transformers. To solve the problem, different modeling strategies were proposed [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. To list a few, Zhang and Li [ 6 ] developed a two-dimensional thermal model to study the hot-spot temperature field of winding disks in an oil-immersed transformer, where the differential heat conduction equation of windings with a non-uniform heat generation was coupled with the non-isothermal hydraulic model.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Heat Dissipation Model of Distributed Parameters for Oil-Directed and Air-Forced Traction Transformers and Its Experimental Validation

You

Shao

2023

Entropy

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A traction transformer with narrow oil channels is usually cooled with the ODAF or “Oil Directed Air Forced” method, where its temperature greatly depends on the Joule heat of windings, the conjugate heat transfer in the transformer, and the secondary heat release via oil cooler, together with the oil flowrate generated by oil pump. Neither the thermal–electric analogy nor the CFD simulation approach is qualified to predict the temporal and spatial temperature variations in this type of transformer. In the current work, the distributed parameter models are built for traction transformers and oil coolers with the assumption of a one-dimensional temperature field in the oil flow direction, respectively. Then, the two models are combined with the lumped parameter ones of oil pumps and pipes via the flow rate, temperature and pressure continuities at their interfaces, resulting in the derivation of the dynamic heat dissipation model of oil-directed and air-forced traction transformers. Additionally, an efficient algorithm is proposed for its numerical solution, and the temperature rise experiment is performed for model validation. Finally, the fundamental of dynamic heat dissipation in traction transformers is investigated with the current numerical model and the effects of ambient temperature are studied.

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Section: Introductionmentioning

confidence: 99%

Dynamic Heat Dissipation Model of Distributed Parameters for Oil-Directed and Air-Forced Traction Transformers and Its Experimental Validation

You

Shao

2023

Entropy

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Fast calculation of temperature distribution in oil-immersed transformer windings based on U-net neural network

et al. 2023

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In this paper, a fast computational method based on the training of the U-net neural network is proposed to solve the fluid-thermal coupling problem of transformers. First, the input variables are selected according to the fluid-thermal coupling principle, and the finite volume method is applied to obtain the output results under different operating conditions and make them into training sets and test sets. Second, the training sets are normalized and input into the U-net neural network. At the same time, three hyperparameters that have more influence on the network training are discussed in detail, and the optimal combination of hyperparameters is determined. Finally, the prediction set is fed into the trained model for prediction computation, and the results are subjected to the inverse normalization operation, whose predictive results are consistent with those calculated by the finite volume method. In addition, the computational time is shortened from 300 to 0.07 s, and the prediction variance does not exceed 0.055 K2. The results show that the proposed method can be used to obtain the temperature of immersed transformer windings quickly, which provides an effective tool for real-time temperature simulation of the digital twin of power transformers.

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Experimental and Simulation Research on Transient Temperature Distribution of Product-level Oil-Immersed Transformer Winding

Rong

Liu

Wu³

et al. 2020

2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)

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A two-dimensional transient fluid-thermal coupling method for temperature rising calculation of transformer winding based on finite element method

Cited by 5 publications

References 22 publications

Dynamic Heat Dissipation Model of Distributed Parameters for Oil-Directed and Air-Forced Traction Transformers and Its Experimental Validation

Dynamic Heat Dissipation Model of Distributed Parameters for Oil-Directed and Air-Forced Traction Transformers and Its Experimental Validation

Fast calculation of temperature distribution in oil-immersed transformer windings based on U-net neural network

Experimental and Simulation Research on Transient Temperature Distribution of Product-level Oil-Immersed Transformer Winding

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