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

机译：基于有限元法的变压器绕组温度上升计算二维瞬态流体 - 热耦合方法

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摘要

In order to study the characteristics of the temperature variation in oil-immersed power transformer windings during operation, a two-dimensional transient fluid-thermal coupling calculation method for the transient temperature rising of transformer windings is proposed. Based on the dimensionless least-square finite element method (DLSFEM), the two-dimensional transient fluid-thermal coupling calculation method calculates the velocity distribution of the transformer flow field at different time instants, and based on the upwind finite element method, the temperature distribution at each moment is calculated. Considering the influence of the nonlinear material properties and winding Joule loss on the calculation results, the sequential iteration method is applied to solve the fluid-thermal coupling problem, and finally, the characteristics of the field temperature change are obtained. Compared with the traditional least-square finite element method, the DLSFEM has smaller stiffness matrix number conditions, and the corresponding discrete equations have better convergence. An oil-immersed power transformer winding model is taken as an instance, and the temperature distribution is calculated by the proposed method and the commercial computational fluid dynamic software Fluent. The calculation results of the proposed method are basically consistent with those of Fluent, and its iterative number is much less than that of Fluent, which greatly improves the calculation efficiency.
机译：为了研究操作期间油浸电力变压器绕组的温度变化的特性，提出了一种用于变压器绕组瞬态温度上升的二维瞬态流体热耦合计算方法。基于无量纲最小二乘有限元方法（DLSFEM），二维瞬态流体 - 热耦合计算方法计算不同时间瞬间变压器流场的速度分布，并基于UPWIND有限元方法，温度计算每个时刻的分布。考虑到非线性材料特性和绕组焦耳损失对计算结果的影响，应用了序贯迭代方法来解决流体 - 热耦合问题，最后，获得了场温变化的特性。与传统的最小二乘有限元方法相比，DLSFEM具有较小的刚度矩阵数条件，并且相应的离散式方程具有更好的收敛性。作为一个实例，采用油浸式电力变压器绕组模型，通过所提出的方法和商业计算流体动态软件流畅计算温度分布。所提出的方法的计算结果与流利的方法基本上是一致的，其迭代数量远低于流利的数量，这大大提高了计算效率。

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